Ms. Svetlana Chepikova Profile

Svetlana Chepikova

at NERSC

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Proceedings Article | 20 September 2020 Poster + Paper

A possible teleconnection mechanism of initiation of Emiliania huxleyi outbursts in the Bering Sea in 1998-2001 and 2018-2019

Dmitry Pozdnyakov, Svetlana Chepikova, Dmitry Kondrik

Proceedings Volume 11534, 1153412 (2020) https://doi.org/10.1117/12.2573272

KEYWORDS: Water, Satellites, Oceanography, Iron, Temperature metrology, Earth observing sensors, Ecosystems, Data modeling

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A coccolithophore Emiliania huxleyi is the most abundant calcifying algal species throughout the world’s oceans. As it is capable of significantly affect the marine surface biogeochemistry and carbon cycling between the atmosphere and ocean, its importance has both climatic and aquatic ecology dimensions. Blooms of this alga exhibit remarkable spatiotemporal variations and proved to be aquatic environment specific. Here we present our hypothesis regarding the origination of the intense blooms of this alga that occurred in the Bering Sea during 1997-2001, and further on in 2018- 2019. Our hypothesis relies on (a) the salient transport anomalies in the Bering Sea Slope Current, and the Alaska Stream, and the Near Strait throughflow that were documented elsewhere for the above period, (b) the retrieved spaceborne time series of statistical occurrences of NE&E horizontal directions of the geostrophic current at the east passes in the Aleutian arc, and the timings of the two latest El Niño events.

Proceedings Article | 14 October 2019 Paper

Environmental conditions favoring coccolithophore blooms in subarctic and arctic seas: a 20-year satellite and multi-dimensional statistical study

Dmitry Pozdnyakov, Dmitry Kondrik, Eduard Kazakov, Svetlana Chepikova

Proceedings Volume 11150, 111501W (2019) https://doi.org/10.1117/12.2547868

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Producing very extensive blooms in the world’s oceans in both hemispheres, a coccolithophore E. huxleyi affects both marine ecology and carbon fluxes at the atmosphere-ocean interface. In turn, it is subject to impacts of multiple co-acting environmental forcings responsible for spatio-temporal dynamics in E. huxleyi blooms. To reveal the individual importance of each forcing factor (FF) that is known to significantly control the extent and intensity of E. huxleyi blooms, the 1998-2016 spaceborne time series of sea surface temperature and salinity, incident photosynthetically active radiation, and the Ekman depth relevant to the North, Norwegian, Greenland, Labrador, Barents and Bering seas were employed. The descriptive statistical approach showed that E. huxleyi phytoplankton blooms were capable of arising and developing within wide but expressly sea-specific FFs ranges. Sea-specific FFs ranges, within which the blooms are particularly extensive were identified. The Random Forest Classifier (RFC) allowed to reliably rank the FFs in terms of their role in E. huxleyi bloom spatiotemporal dynamics in each target sea. High prediction ability of RFC modelling (>70%) confirms the adequacy of the developed FFs prioritization models. Although the parameters of the carbon chemistry system per se were beyond consideration, however, over the twenty years of observations, the prioritized FFs have not failed to explain the registered patterns of the spatial extent of and particulate inorganic carbon content in E. huxleyi blooms. Also, several verifications (pastcasts) showed a high degree of their consistency with the observations. Collectively, these results tell in favor of sufficiency of the FFs employed.

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