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Table 1.

Remote sensing criteria defining the types of phytoplankton phenology throughout marginal ice zones. DOI: https://doi.org/10.1525/elementa.039.t1

Phenology TypeaCriteriab
I—Oligotrophic or old under-ice bloom [Chla(tR)]<B 
[Chla(tR)]<[Chla(t1,2,3...)max]<B 
II—Probable (recent) under-ice bloom Ol<[Chla(tR)]<B 
[Chla(t1,2,3...)max]<[Chla(tR)] 
III—Mesotrophic/nutrients replenished [Chla(tR)]B 
[Chla(t1,2,3...)max]B 
[Chla(t1,2,3...)min]B 
VI—Bloom triggered in ice-free waters [Chla(tR)]<[Chla(t1,2,3...)max] 
[Chla(tR)]<B 
[Chla(t1,2,3...)max]B 
V—Bloom triggered under-ice [Chla(tR)]<[Chla(t1,2,3...)min] 
[Chla(tR)]B 
[Chla(t1,2,3...)min]<B 
Phenology TypeaCriteriab
I—Oligotrophic or old under-ice bloom [Chla(tR)]<B 
[Chla(tR)]<[Chla(t1,2,3...)max]<B 
II—Probable (recent) under-ice bloom Ol<[Chla(tR)]<B 
[Chla(t1,2,3...)max]<[Chla(tR)] 
III—Mesotrophic/nutrients replenished [Chla(tR)]B 
[Chla(t1,2,3...)max]B 
[Chla(t1,2,3...)min]B 
VI—Bloom triggered in ice-free waters [Chla(tR)]<[Chla(t1,2,3...)max] 
[Chla(tR)]<B 
[Chla(t1,2,3...)max]B 
V—Bloom triggered under-ice [Chla(tR)]<[Chla(t1,2,3...)min] 
[Chla(tR)]B 
[Chla(t1,2,3...)min]<B 

aDefined based on the time evolution of Chla after the sea-ice retreat (with Chla in mg m–3).

bB is the bloom threshold (B), here set to 0.5 mg m–3; the oligotrophic threshold (Ol) was set to 0.2 mg m–3; tR is the day of sea-ice retreat defined as the day at which sea-ice concentration (SIC) is below 10% for at least 24 days; t1,2,3... refers to weeks after the sea-ice retreat.

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