статья в журнале

En

Izvestiya - Atmospheric and Ocean Physics

ISSN:00014338

2021

Kivva, K.K.¹

10.1134/S0001433821120136

Abstract: This study characterizes the spatiotemporal variability of chlorophyll-a in the Bering Sea and adjacent Pacific Ocean based on 2003–2019 MODIS data. Average long-term seasonal variations of the chlorophyll-a concentration are described, and the typical times of phytoplankton bloom in various parts of the given area are found. Interannual variability of spring bloom times is analyzed for three regions: the western part of the sea northeast of the Kamchatka Strait, the northern part of the sea near Cape Navarin, and the central part of the sea. The first two of these regions have similar average long-term characteristics. We have shown that the interannual variability of the onset of spring bloom times vary between these two regions with an amplitude of around 2 months. The western part of the sea is characterized by a shift in bloom to earlier periods (March–April), while the spring bloom in the northern region shifts to May–June. Unlike these two regions, the spring bloom is much less pronounced in the central part of the sea; it usually starts in May–June and may last for several weeks. In this case, the chlorophyll-a concentration can be relatively high in August–October as well. In some years, the fall bloom can be even more pronounced by intensity (with a peak of the chlorophyll-a concentration) than the spring bloom. This situation is more typical for the open Pacific Ocean, rather than for the Bering Sea. For the entire water area under consideration, we have compared the course of spring bloom in 2010 and 2015 to reveal that the spatial development of bloom in different years can also vary significantly. The interannual differences in its onset in different regions of the sea are most likely associated with the features of physical processes that control the formation of stable water stratification (spring ice melting and solar heating under weak wind impact) and can also be associated with the variability of currents

Bering Sea, chlorophyll-a, MODIS, phenology, phytoplankton “bloom”, remote sensing

2022-05-24 11:25:38