...T. Klausner; M. Mertens; H. Huntrieser; M. Galkowski; G. Kuhlmann; R. Baumann; A. Fiehn; P. Jöckel; M. Pühl; A. Roiger; Detlev Helmig; Lori Bruhwiler Urban areas are recognised as a significant source of greenhouse gas emissions (GHG), such as carbon dioxide (CO 2 ) and methane (CH 4 ). The total...

...-level emissions using atmospheric methods, to overcome the challenge of the spatial overlap of nearly every predefined source sector. Our OSSE additionally allows us to demonstrate that increasing the (already high) data density cannot solve the co-localization problem. Although urban areas account...

....126.f1 decision-support policy air quality climate change urban decision-support tools Air quality and climate change are two of the foremost environmental issues of concern at the global, regional and local scales. Yearly, 2.6 million premature deaths globally result from air...

... of the urban CO source and yielding 13 CO of –27.7 ± 0.5‰ VPDB and C 18 O of 17.7 ± 1.1‰ VSMOW for this source. We use the tower isotope measurements, results from a limited traffic study, as well as atmospheric reaction rates to examine contributions from different sources to the Indianapolis CO budget. Our...

...Brian J. Gaudet; Thomas Lauvaux; Aijun Deng; Kenneth J. Davis; Detlev Helmig; Paul Palmer The Indianapolis Flux Experiment (INFLUX) aims to quantify and improve the effectiveness of inferring greenhouse gas (GHG) source strengths from downstream concentration measurements in urban environments...

... quantify spatial and temporal patterns in urban atmospheric GHG dry mole fractions. The platform for these measurements is twelve communications towers spread across the metropolitan region, ranging in height from 39 to 136 m above ground level, and instrumented with cavity ring-down spectrometers. Nine...

.... Gurney; Detlev Helmig; Armin Wisthaler To effectively address climate change, aggressive mitigation policies need to be implemented to reduce greenhouse gas emissions. Anthropogenic carbon emissions are mostly generated from urban environments, where human activities are spatially concentrated...

...Gabriel M. Filippelli; Martin Risch; Mark A.S. Laidlaw; Deborah E. Nichols; Julie Crewe; Joel D. Blum; David Long The past and future of cities are inextricably linked, a linkage that can be seen clearly in the long-term impacts of urban geochemical legacies. As loci of population as well...

...David T. Long; Thomas C. Voice; Ao Chen; Fangli Xing; Shu-Guang Li; Joel D. Blum; Berry Lyons The study of sodium and chloride in the environment has a long history with a particular focus on road salting in urban areas. In many studies, spatial scales are limited (e.g., city) and temporal...