This article sets the near-surface meteorological conditions during the Multidisciplinary drifting Observatory for the Study of Arctic Climate expedition in the context of the interannual variability and extremes within the past 4 decades. Hourly ERA5 reanalysis data for the Polarstern trajectory for 1979–2020 are analyzed. The conditions were relatively normal given that they were mostly within the interquartile range of the preceding 4 decades. Nevertheless, some anomalous and even record-breaking conditions did occur, particularly during synoptic events. Extreme cases of warm, moist air transported from the northern North Atlantic or northwestern Siberia into the Arctic were identified from late fall until early spring. Daily temperature and total column water vapor were classified as being among the top-ranking warmest/wettest days or even record-breaking based on the full record. Associated with this, the longwave radiative fluxes at the surface were extremely anomalous for these winter cases. The winter and spring period was characterized by more frequent storm events and median cyclone intensity ranking in the top 25th percentile of the full record. During summer, near melting point conditions were more than a month longer than usual, and the July and August 2020 mean conditions were the all-time warmest and wettest. These record conditions near the Polarstern were embedded in large positive temperature and moisture anomalies over the whole central Arctic. In contrast, unusually cold conditions occurred during the beginning of November 2019 and in early March 2020, related to the Arctic Oscillation. In March, this was linked with anomalously strong and persistent northerly winds associated with frequent cyclone occurrence to the southeast of the Polarstern .

Climate impact studies often require a reduction of the ensembles of opportunity from the Coupled Model Intercomparison Project when the simulations are used to drive impact models. An impact model’s nature limits the number of feasible realizations based on complexity and computational requirements or capacities. For the purpose of driving a hydrological model and an ocean model in the BaySys research program, two hierarchical, differently sized simulation ensembles were produced to represent climate evolution for the region of the Hudson Bay Drainage Basin. We compare a 19-member ensemble to a 5-member subset to demonstrate comparability of the driving climate used to produce model results. Ten extreme climate indicators and their changes are compared for the full study region and seven sub regions, on an annual and seasonal basis and for two future climate horizons. Results indicate stronger warming in the North and for cold temperatures and an East-West gradient in precipitation with larger absolute increases to the East and South of the Hudson Bay. Generally, the smaller ensemble is sufficient to adequately reproduce the mean and spread in the indicators found for the larger ensemble. The analysis of extreme climate indicators ensures that the tails of the distribution of temperature and precipitation are addressed. We conclude that joint analysis at the interface of the hydrological and ocean model domains are not limited by the application of differently sized climate simulation ensembles as driving input for the two different modeling exercises of the BaySys project environmental studies, yet acknowledging that impact model output may be dependent on other factors.

In this analysis, we examine relative contributions from climate change and river discharge regulation to changes in marine conditions in the Hudson Bay Complex using a subset of five atmospheric forcing scenarios from the Coupled Model Intercomparison Project Phase 5 (CMIP5), river discharge data from the Hydrological Predictions for the Environment (HYPE) model, both naturalized (without anthropogenic intervention) and regulated (anthropogenically controlled through diversions, dams, reservoirs), and output from the Nucleus for European Modeling of the Ocean Ice-Ocean model for the 1981–2070 time frame. Investigated in particular are spatiotemporal changes in sea surface temperature, sea ice concentration and thickness, and zonal and meridional sea ice drift in response to (i) climate change through comparison of historical (1981–2010) and future (2021–2050 and 2041–2070) simulations, (ii) regulation through comparison of historical (1981–2010) naturalized and regulated simulations, and (iii) climate change and regulation combined through comparison of future (2021–2050 and 2041–2070) naturalized and regulated simulations. Also investigated is use of the diagnostic known as e-folding time spatial distribution to monitor changes in persistence in these variables in response to changing climate and regulation impacts in the Hudson Bay Complex. Results from this analysis highlight bay-wide and regional reductions in sea ice concentration and thickness in southwest and northeast Hudson Bay in response to a changing climate, and east-west asymmetry in sea ice drift response in support of past studies. Regulation is also shown to amplify or suppress the climate change signal. Specifically, regulation amplifies sea surface temperatures from April to August, suppresses sea ice loss by approximately 30% in March, contributes to enhanced sea ice drift speed by approximately 30%, and reduces meridional circulation by approximately 20% in January due to enhanced zonal drift. Results further suggest that the offshore impacts of regulation are amplified in a changing climate.

The Arctic atmosphere–surface system transmits visible light from the Sun to the ocean, determining the annual cycle of light available to microalgae. This light is referred to as photosynthetically available radiation (PAR). A known consequence of Arctic warming is the change at the atmosphere–ocean interface (longer ice-free season, younger ice), implying an increase in the percentage of PAR being transferred to the water. However, much less is known about the recent changes in how much PAR is being transferred by the overlaying atmosphere. We studied the transfer of PAR through the atmosphere between May 21 and July 23 at a pan-Arctic scale for the period ranging from 2000 to 2016. By combining a large data set of atmospheric and surface conditions into a radiative transfer model, we computed the percentage of PAR transferred to the surface. We found that typical Arctic atmospheres convey between 60% and 70% of the incident PAR received from the Sun, meaning the Arctic atmosphere typically transmits more light than most sea ice surfaces, with the exception of mature melt ponds. We also found that the transfer of PAR through the atmosphere decreased at a rate of 2.3% per decade over the studied period, due to the increase in cloudiness and the weaker radiative interaction between the atmosphere and the surface. Further investigation is required to address how, in the warmer Arctic climate, this negative trend would compensate for the increased surface transmittance and its consequences on marine productivity.

In this paper, we examine sea surface temperatures (SSTs) and sea ice conditions in the Hudson Bay Complex as a baseline evaluation for the BaySys 2016–2018 field program time frame. Investigated in particular are spatiotemporal patterns in SST and sea ice state and dynamics, with rankings of the latter to highlight extreme conditions relative to the examined 1981–2010 climatology. Results from this study show that SSTs in northwestern Hudson Bay from May to July, 2016–2018, are high relative to the climatology for SST (1982–2010). SSTs are also warmer in 2016 and 2017 than in 2018 relative to their climatology. Similarly, unusually low sea ice cover existed from August to December of 2016 and July to September of 2017, while unusually high sea ice cover existed in January, February, and October of 2018. The ice-free season was approximately 20 days longer in 2016 than in 2018. Unusually high ice-drift speeds occurred in April of 2016 and 2017 and in May of 2018, coinciding with strong winds in 2016 and 2018 and following strong winds in March 2017. Strong meridional circulation was observed in spring of 2016 and winter of 2017, while weak meridional circulation existed in 2018. In a case study of an extreme event, a blizzard from 7 to 9 March 2017, evaluated using Lagrangian dispersion statistics, is shown to have suppressed sea ice deformation off the coast of Churchill. These results are relevant to describing and planning for possible future pathways and scenarios under continued climate change and river regulation.

Phytoplankton blooms in the Arctic marginal ice zone (MIZ) can be prolific dimethylsulfide (DMS) producers, thereby influencing regional aerosol formation and cloud radiative forcing. Here we describe the distribution of DMS and its precursor dimethylsulfoniopropionate (DMSP) across the Baffin Bay receding ice edge in early summer 2016. Overall, DMS and total DMSP (DMSP t ) increased towards warmer waters of Atlantic origin concurrently with more advanced ice-melt and bloom stages. Relatively high DMS and DMSP t (medians of 6.3 and 70 nM, respectively) were observed in the surface layer (0–9 m depth), and very high values (reaching 74 and 524 nM, respectively) at the subsurface biomass maximum (15–30 m depth). Microscopic and pigment analyses indicated that subsurface DMS and DMSP t peaks were associated with Phaeocystis pouchetii , which bloomed in Atlantic-influenced waters and reached unprecedented biomass levels in Baffin Bay. In surface waters, DMS concentrations and DMS:DMSP t ratios were higher in the MIZ (medians of 12 nM and 0.15, respectively) than in fully ice-covered or ice-free conditions, potentially associated with enhanced phytoplanktonic DMSP release and bacterial DMSP cleavage (high dddP : dmdA gene ratios). Mean sea–air DMS fluxes (µmol m –2 d –1 ) increased from 0.3 in ice-covered waters to 10 in open waters (maximum of 26) owing to concurrent trends in near-surface DMS concentrations and physical drivers of gas exchange. Using remotely sensed sea-ice coverage and a compilation of sea–air DMS flux data, we estimated that the pan-Arctic DMS emission from the MIZ (E DMS, MIZ ) was 5–13 Gg S yr –1 . North of 80°N, E DMS, MIZ might have increased by around 10 ± 4% yr –1 between 2003 and 2014, likely exceeding open-water emissions in June and July. We conclude that E DMS, MIZ must be taken into account to evaluate plankton-climate feedbacks in the Arctic.

In the field of Arctic health, “resilience” is a concept used to describe the capacity to recover from adversities. The term is widely used in Arctic policy contexts; however, Arctic peoples and communities question whether “resilience” is an appropriate term to describe the human dimensions of health and well-being in the Arctic as it is currently applied. A scoping review of peer-reviewed and gray literature was conducted. We used searchable databases, Google Scholar, and Dartmouth College Library Services, to select studies conducted between 2000 and 2019 and key documents from the Arctic Council and other relevant organization and government entities. A scoping review framework was followed, and consultation among the authors provided initial scope, direction, and verification of findings. Analyses identified over- and underrepresented key thematic areas in the literature on human resilience in Arctic communities. Areas of overrepresentation in the literature included ecosystem, climate change, and environmental sciences. Areas that were underrepresented in the literature included health, medicine, wellness or well-being, and community voices on the topic of human resilience. Results indicated that “resilience” as a concept was applied across a diversity of contexts and subject areas in the Arctic and that this may have repercussions for understanding the human dimension of “resilience” and community expressions of well-being. Alternative terms and concepts with which Northern community members more closely identify could be used to more respectfully and accurately advance research in areas such as epidemiology, community health and well-being, and particularly Indigenous peoples’ health.

Many Arctic communities are exposed to energy security risks. Remote settlements rely largely on diesel for energy production, which results in higher consumer prices, negative impacts on the environment and public health. In the past few years, pilot projects for switching remote villages from diesel-generated to wind- and solar-diesel hybrid power plants were realized across the Arctic. Renewable energy projects have a major potential to alleviate energy security risks, promote public health and better environment. Yet, renewable energy does not take hold easily in the Arctic region. Especially in Russia, significant subsidies for fossil fuel present a major disincentive, as well as perpetuate vested interests of national oil companies. Despite the Russian Arctic being a ‘hard case’ for renewables development, there has been both interest in and progress towards the uptake of renewable energy across the Russian Arctic regions. This article contributes to the ‘local turn’ in sustainable energy policy studies by exploring two intertwined questions: which factors contribute to renewable energy development in the Russian Arctic and how do these factors characterise differences between individual Arctic communities? Using a combination of exploratory factor analysis and correspondence analysis in application to the local level (municipal) data, we update the existing models of the factors contributing to renewable energy uptake and put forward four distinct community-level models that describe renewables uptake. We conclude by emphasizing the importance of the local perspective on sustainable energy as a key to explaining differences in observed policy outcomes.

Although numerous comparative Indigenous health policy analyses exist in the literature, to date, little attention has been paid to comparative analyses of Circumpolar health policy and the impact these policies may have on Indigenous peoples’ rights to health. In this article, we ground our discussion of Indigenous peoples’ right to access culturally appropriate and responsive health care within the context of the United Nations Declaration on the Rights of Indigenous Peoples (UNDRIP). Under UNDRIP, signatory states are obligated to guarantee that Indigenous peoples have access to the same services accessible to all citizens without discrimination. Signatory states must also guarantee access to services that are grounded in Indigenous cultures, medicines, and practices and must address Indigenous peoples’ determinants of health at least to the same extent as their national counterparts. Our analysis finds that the implementation of this declaration varies across the Circumpolar north. The United States recognizes an obligation to provide health care for American Indian and Alaska Native people in exchange for the land that was taken from them. Other countries provide Indigenous citizens access to care in the same health care systems as other citizens. Intercultural models of care exist in Alaska and to some extent across the Canadian territories. However, aside from Sámi Norwegian National Advisory Unit on Mental Health and Substance Use in northern Norway, intercultural models are absent in Nordic countries and in Greenland. While Russia has not ratified UNDRIP, Russian policy guarantees access to health care to all citizens, although access is particularly limited in rural and remote environments, including the Russian Arctic. We conclude that Circumpolar nations should begin and/or expand commitments to culturally appropriate, self-determined, access to health care in Circumpolar contexts to reduce health inequities and adhere to obligations outlined in UNDRIP.

There is a growing global interest in Arctic natural resources that have a strong influence on the local economies. The Arctic economy is a rather unique phenomenon encompassing Indigenous practices, local economic activities, and industrial development. Indigenous economies vary across the Arctic states and exhibit divergent economic mixtures. In globalizing societies and full market economies, traditional Indigenous economies are changing and perceived especially by the non-Indigenous to be a tribute to old customs rather than a way of life that is being followed by the young generation. However, certain groups of the contemporary Indigenous populations in the Arctic continue to preserve their culture and ensure the continuation of Indigenous ways of life. The development of Indigenous communities is closely linked to their economic well-being, on the one hand, and to their culture and traditions, on the other. Our article contributes to the discussion on the significance of Indigenous economies in providing sustainability in terms of Indigenous communities, their culture, and traditions. The research objective is to identify strategies and tools that sustain Indigenous economies as well as the goals of various stakeholders in encouraging and supporting the traditional economic activities of Indigenous peoples. We contrast three countries—Russia, Finland, and the United States (Alaska)—and discuss some governmental strategies that can be employed for preserving unique Indigenous economies. The research methods consist of a content analysis of state and regional legislation and strategies, social studies of stakeholders’ opinions, case studies describing market infrastructure, and economic activities as well as features of traditional lifestyles and Indigenous knowledge typical of these regions.

Legal regulation of socio-cultural processes taking place in the Barents Euro-Arctic Region (BEAR) is not effective without involving indigenous communities, which is a specific population group representing the traditional ethno-cultural landscape of the region, unchanged for centuries and affected by globalization. Owing to the cross-border nature of the BEAR, socio-cultural characteristics acquire special synergetic properties determining the vectors of intergovernmental cooperation. With areas of its land making up the largest part of the BEAR, Russia seems to be the key actor in its socio-cultural development. It is difficult to estimate the progress of the unity without understanding the legal and political background of Russia in the field of indigenous issues. This paper sheds light on the policy and regulations on indigenous-related issues in Russia by examining five cases of regions which are part of the Russian Arctic Zone and the BEAR members. The authors compare the essential actions and measures the Russian Arctic regions have taken for complying with the international indigenous agenda. The paper also makes an effort to examine the potential for cooperation in the BEAR through establishing institutional, political and legal mechanisms. The conclusion arrived at is that Russia needs to take major steps to ensure progress and development of its part of the BEAR and to contribute to the BEAR development by fostering further discussion and cooperation on indigenous rights, joint decision-making, clean environment, education and native languages, peace and security.

Health care delivery in the Circumpolar North is challenged by a scarcity of culturally relevant health care services, few medical providers trained in cross-cultural care, and high costs of transportation. Community health workers (CHWs) are primarily Indigenous individuals who provide on-the-ground health care and health promotion services in their own communities. The CHWs’ scope of work varies from health education to clinical care and often focuses on upstream factors that impact the public’s health. Although often overlooked and underutilized, the CHW role is an innovative approach to promoting more sustainable and culturally relevant care within health systems. Investigating and understanding the potential ways that CHW-integrated health care systems support health and wellness could allow for a clearer understanding of how to translate this approach to other regions seeking a transition to sustainability in health and wellness. Drawing on experiences with CHWs in the Circumpolar North, this article introduces a conceptual model summarizing pathways that describe how integrating CHWs supports wellness in their communities. The proposed model includes five pathways for how CHWs could support wellness: (1) the recruitment of CHWs from within a community promotes community capacity and control; (2) the CHW role allows them to advocate to address structural and systemic inequalities that contribute to ill health, if CHWs are supported to organize their communities around wellness; (3) CHWs have the potential to support and empower community members; (4) CHWs have the potential to develop culturally relevant, feasible, and effective health promotion strategies; and (5) CHWs have the potential to build on community strengths. This model allows for CHW-integrated health care systems to be critically examined to both test and refine this proposed model, and support and empower community health workers as a transition to a more sustainable health care delivery system that reduces inequities and promotes health.

Easier accessibility and demand for so-called last chance tourism has contributed to rapid growth in Arctic cruise ship tourism. Arctic cruising brings many benefits to remote coastal communities but also presents an array of risks. In the light of this context, this article explores the concept of systemic risk of cruise ship incidents in general, findings which are then placed in an Arctic context and consideration given of the role the insurance sector may play in addressing cruise ship incidents. The study is based on metadata, both from academic and nonacademic sources. Findings are drawn from 11 global case studies of cruise ship incidents, 5 of which are polar examples. In the worst-case scenario, an array of serious economic, business, environmental, sociocultural, and security impacts may unfold in the Arctic, presenting risks that may be considerably worse than in other parts of the world. Arctic-specific challenges include extreme weather conditions and the presence of sea-ice, navigation and communication conditions, and lack of infrastructure (port facilities, Search and Rescue capabilities). Significant knowledge gaps across the Arctic have been identified, for example, in terms of seabed mapping, how to deal with industry-related activities, and the risks and nature of environmental change. When cruise ship risks in the Arctic are considered, both passenger and shipowner risk need to be accounted for, including Search and Rescue cover. Although data are limited, there is evidence that the sociocultural risks of an Arctic cruise ship incident are insufficiently addressed, either via insurance mechanisms or cross-border, navigational safety guidelines such as the Polar Code. The academic contribution of the study is the systemic scale of the analysis, and the practical and political implications are to lay the foundation for solution discussion that is of relevance in an Arctic and insurance context.

Reindeer herding is both a traditional livelihood and a business still practiced in the northern parts of Eurasia. In the Nordic countries, reindeer herding has contributed to keeping remote northern areas inhabited while maintaining Indigenous cultures. Reindeer herders have also been able to adapt to new circumstances, and many of them have invested in value-adding production or secondary occupations, such as tourism. The main challenge for reindeer herding is the loss of pastures to other industries and infrastructure projects. The growing investment in wind farms—which not only compete for the same land with reindeer herding but may also disturb the herding practices—has emerged as a recent competitor to reindeer herding in the context of land use. In this article, we study the rights and opportunities of reindeer herders to participate in decision making on land use for infrastructure projects in general and wind farm projects in particular. Our focus is on the situation in Finland, but we also use examples of reported land use conflicts between reindeer herders and wind farms from other Nordic countries. The aim of this article is, on the one hand, to find out how the rights of reindeer herders in planning and making decisions on wind farms are regulated and, on the other hand, how these rights function in practice. In addition to national legislation on participation in land use, there exists a growing number of international conventions to protect the environment and the rights of Indigenous people. Wind farms are particularly interesting in that renewable energy is now internationally preferred and subsidized as “green energy” in the fight against climate change. The challenge remains how to protect traditional livelihoods and human rights while targeting to reduce greenhouse gas emissions.

The purpose of this study was to explore the influence of kinship networks and family relationships on pregnancy dynamics in a settlement in North Greenland. We utilized community-based participatory research framework using ecological systems theory to conduct semistructured interviews with 26 women and 17 men living in Kullorsuaq, Greenland. The extent to which Greenland’s cultural traditions related to naming and adoption practices, intergenerational relationships and communication, educational pursuits, and material resources intersect with pregnancy dynamics in an Arctic Indigenous community is discussed. Results highlight the importance of familial and community connections in pregnancy decision making in Greenlandic culture. Findings suggest that public health programs, health care services, and policies address the involvement of kinship and family networks as well as community level pathways to promote sexual and reproductive health in Greenland.

Adaptation pathways is an approach to identify, assess, and sequence climate change adaptation options over time, linking decisions to critical signals and triggers derived from scenarios of future conditions. However, conceptual differences in their development can hinder methodological advance and create a disconnect between those applying pathways approaches and the wider community of practitioners undertaking vulnerability, impacts, and adaptation assessments. Here, we contribute to close these gaps, advancing principles, and processes that may be used to guide the trajectory for adaptation pathways, without having to rely on data-rich or resource-intensive methods. To achieve this, concepts and practices from the broad pathways literature is combined with our own experience in developing adaptation pathways for primary industries facing the combined impacts of climate change and other, nonclimatic stressors. Each stage is guided by a goal and tools to facilitate discussions and produce feasible pathways. We illustrate the process with a case study from Hawke’s Bay, New Zealand, involving multiple data sources and methods in two catchments. Resulting guidelines and empirical examples are consistent with principles of adaptive management and planning and can provide a template for developing local-, regional- or issue-specific pathways elsewhere and enrich the diversity of vulnerability, impacts, and adaptation assessment practice.

In this study, we characterize atmospheric ozone over the tropical Andes in the boundary layer, the free troposphere, and the stratosphere; we quantify each contribution to total column ozone, and we evaluate the performance of the multi-sensor reanalysis (MSR2) in the region. Thus, we present data taken in Ecuador and Peru (2014–2019). The contribution from the surface was determined by integrating ozone concentrations measured in Quito and Cuenca (Ecuador) up to boundary layer height. In addition, tropospheric and stratospheric column ozone were quantified from ozone soundings (38) launched from Quito during the study time period. Profiles were compared against soundings at Natal (SHADOZ network) for being the closest observational reference with sufficient data in 2014–2019. Data were also compared against stratospheric mixing ratios from the Aura Microwave Limb Sounder (Aura MLS). Findings demonstrate that the stratospheric component of total column ozone over the Andes (225.2 ± 8.9 Dobson Units [DU]) is at similar levels as those observed at Natal (223.3 ± 8.6 DU), and observations are comparable to Aura MLS data. In contrast, the tropospheric contribution is lower over the Andes (20.2 ± 4.3 DU) when compared to Natal (35.4 ± 6.4 DU) due to a less deep and cleaner troposphere. From sounding extrapolation of Quito profiles down to sea level, we determined that altitude deducts about 5–7 DU from the total column, which coincides with a 3%–4% overestimation of the MSR2 over Quito and Marcapomacocha (Peru). In addition, when MSR2 data are compared along a transect that crosses from the Amazon over Quito, the Ecuadorian coast side, and into the Pacific, observations are not significantly different among the three first locations. Results point to coarse reanalysis resolution not being suitable to resolve the formidable altitude transition imposed by the Andes mountain chain. This work advances our knowledge of atmospheric ozone over the study region and provides a robust time series of upper air measurements for future evaluations of satellite and reanalysis products.

The goal of the EXport Processes in the Ocean from RemoTe Sensing (EXPORTS) field campaign is to develop a predictive understanding of the export, fate, and carbon cycle impacts of global ocean net primary production. To accomplish this goal, observations of export flux pathways, plankton community composition, food web processes, and optical, physical, and biogeochemical (BGC) properties are needed over a range of ecosystem states. Here we introduce the first EXPORTS field deployment to Ocean Station Papa in the Northeast Pacific Ocean during summer of 2018, providing context for other papers in this special collection. The experiment was conducted with two ships: a Process Ship, focused on ecological rates, BGC fluxes, temporal changes in food web, and BGC and optical properties, that followed an instrumented Lagrangian float; and a Survey Ship that sampled BGC and optical properties in spatial patterns around the Process Ship. An array of autonomous underwater assets provided measurements over a range of spatial and temporal scales, and partnering programs and remote sensing observations provided additional observational context. The oceanographic setting was typical of late-summer conditions at Ocean Station Papa: a shallow mixed layer, strong vertical and weak horizontal gradients in hydrographic properties, sluggish sub-inertial currents, elevated macronutrient concentrations and low phytoplankton abundances. Although nutrient concentrations were consistent with previous observations, mixed layer chlorophyll was lower than typically observed, resulting in a deeper euphotic zone. Analyses of surface layer temperature and salinity found three distinct surface water types, allowing for diagnosis of whether observed changes were spatial or temporal. The 2018 EXPORTS field deployment is among the most comprehensive biological pump studies ever conducted. A second deployment to the North Atlantic Ocean occurred in spring 2021, which will be followed by focused work on data synthesis and modeling using the entire EXPORTS data set.

The knowledge of unsustainable human and Earth system interactions is widespread, especially in light of systemic environmental injustices. Systems science has enabled complex and rigorous understandings of human and Earth system dynamics, particularly relating to pollution of Earth’s land, water, air, and organisms. Given that many of these systems are not functioning sustainably or optimally, how might this field enable both rigorous understanding of the issues and experiments aimed at alternative outcomes? Here, we put forth a novel, multiscale systems science approach with three steps: (1) understanding the systemic issues at hand, (2) identifying systemic interventions, and (3) applying experiments to study the efficacy of such interventions. We illustrate this framework through the ubiquitous and yet frequently underrecognized issue of soil lead (Pb). First, we describe the systemic interactions of humans and soil Pb at micro-, meso-, and macroscales in time and space. We then discuss interventions for mitigating soil Pb exposure at each scale. Finally, we provide examples of applied and participatory experiments to mitigate exposure at different scales currently being conducted in New York City, NY, USA. We put forth this framework to be flexibly applied to contamination issues in other regions and to other pressing environmental issues of our time.