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<b>Abstract</b>— <p>Based on climate data from the National Oceanic and Atmospheric Administration (NOAA, USA), characteristics and trends of interannual variability of marine heat wave (MHW) parameters in the Sea of Okhotsk during the ice-free period over the past 40 years are determined and their cause-and-effect relationships with large-scale and regional processes in the ocean and atmosphere are analyzed. Particular attention is paid to the extreme MHWs of the early 2020s, accompanied by a surge in chlorophyll <i>a</i> concentrations during the outbreak of harmful algal blooms (HABs) near the island of Hokkaido. Against the background of a statistically significant increase in the sea surface temperature (SST) of the Sea of Okhotsk (~0.3°C/10 years), MHWs spread to the entire water area of the sea by 2008. In the past two decades, a significant increase in all MHW metrics has been observed, correlating with anomalies of surface air temperature, geopotential at 500 hPa, and climate indices. The role of extreme MHW events in the chain of events leading to the HAB and the environmental incident in autumn 2021 has been confirmed. Continued intensification of MHW events may cause dramatic changes in marine ecosystems in the region.</p>

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Manifestation of Marine Heat Waves in the Sea of Okhotsk in the Concept of the Impact of Global Warming on the State of Marine Ecosystems

  • 期刊论文

  • 发表日期：

    2026年4月16日

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  • I. D. Rostov,
  • E. V. Dmitrieva

摘要

Abstract—

Based on climate data from the National Oceanic and Atmospheric Administration (NOAA, USA), characteristics and trends of interannual variability of marine heat wave (MHW) parameters in the Sea of Okhotsk during the ice-free period over the past 40 years are determined and their cause-and-effect relationships with large-scale and regional processes in the ocean and atmosphere are analyzed. Particular attention is paid to the extreme MHWs of the early 2020s, accompanied by a surge in chlorophyll a concentrations during the outbreak of harmful algal blooms (HABs) near the island of Hokkaido. Against the background of a statistically significant increase in the sea surface temperature (SST) of the Sea of Okhotsk (~0.3°C/10 years), MHWs spread to the entire water area of the sea by 2008. In the past two decades, a significant increase in all MHW metrics has been observed, correlating with anomalies of surface air temperature, geopotential at 500 hPa, and climate indices. The role of extreme MHW events in the chain of events leading to the HAB and the environmental incident in autumn 2021 has been confirmed. Continued intensification of MHW events may cause dramatic changes in marine ecosystems in the region.