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Ice melt season in the Kara Sea: Size-fractionated primary production and chlorophyll-a, evolution of the subsurface chlorophyll maximum layer and its contribution to total water column valuesстатья Исследовательская статья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Demidov A.B., Belevich T.A., Kostyleva A.V., Sergeeva V.M., Polukhin A.A., Artemiev V.A., Nedospasov A.A., Migali D.I., Flint M.V.
- Журнал: Progress in Oceanography
- Год издания: 2025
- Издательство: Pergamon Press Ltd.
- Местоположение издательства: United Kingdom
- Номер статьи: 103652
- DOI: 10.1016/j.pocean.2025.103652
- Аннотация: The characteristics of phytoplankton variability during spring sea ice retreat are poorly understood at the regional scale. To address this gap, three cruises were conducted in the Kara Sea from late June to early August during sea ice retreat. The present study focused on the variability of primary production (PP), chlorophyll-a (Chl-a) concentration of total and size-fractionated phytoplankton, the evolution of the subsurface Chl-a maximum layer (SCML), and its contribution to the total water column PP (IPPtot) and integrated photosynthetic layer Chl-a (Chlph). During the study period, the ice-edge phytoplankton bloom was characterised by high values of IPPtot and Chlph (up to 1352 mgC m−2 d–1 and 151.53 mg m−2, respectively) and a dominance of microphytoplankton (>20 µm) in the water column (88 % of IPPtot and 77 % of Chlph on average) and in the SCML (52 % of PP and 64 % of Chl-a on average). The role of nano- (3 – 20 µm) and picophytoplankton (<3 µm) increased with sea ice retreat. During the melt season, micro-, nano- and picophytoplankton contributed on average 50, 14 and 36 % to IPPtot and 60, 15 and 25 % to Chlph, respectively. PP and Chl-a associated with the SCML contributed 32 % to IPPtot and 76 % to Chlph. The rapid decline in IPPtot during sea ice retreat suggests that Arctic warming, sea ice loss, and the significant increase in total PP due to newly exposed open water areas may not be accompanied by an increase in photosynthetic activity in the Arctic Ocean. During the ice melt season in the Kara Sea ∼1/3 of IPPtot and 3/4 of Chlph are concentrated in the SCML, emphasizing its importance in the seasonal trophic balance and in the development of PP algorithms.
- Добавил в систему: Белевич Татьяна Алексеевна
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