Abstract
We studied effects of sea surface temperature anomaly (SSTA) in the Barents Sea in autumn on the atmospheric circulation in northeast China in winter, using the NCEP reanalysis data and sea surface temperature (SST) data of the Hadley Center. The results show that the ocean thermal conditions in the Barents Sea in autumn can be used as an important reference factor for predicting the cold air activity in China. When the sea surface temperature anomaly of the Barents Sea elevated in the autumn, the sea-level pressure anomaly elevated in eastern China on December, northeast China and southeastern Russia on January and February. In the years when the SSTA of the Barents Sea elevated in the autumn, the abnormal high-pressure ridge developed over Europe, and the geopotential height in western China appeared negative anomaly at 500 hPa. At 1000 hPa, the Mongolia high-pressure increased and the northerly airflow strengthened the cold high-latitude air broke out to the south, which was easy to affect northeast and north of China. In negative SSTA years, the high-pressure ridge was west to the north Atlantic, and the geopotential height in central and northern Siberia appeared negative anomaly at 500 hPa; the Mongolia high-pressure was weakened at 1000 hPa.
Highlights
Ocean is an important source of forcing the anomalous change of atmospheric circulation
In the years when the sea surface temperature anomaly (SSTA) of the Barents Sea elevated in the autumn, the abnormal high-pressure ridge developed over Europe, and the geopotential height in western China appeared negative anomaly at 500 hPa
In negative SSTA years, the high-pressure ridge was west to the north Atlantic, and the geopotential height in central and northern Siberia appeared negative anomaly at 500 hPa; the Mongolia high-pressure was weakened at 1000 hPa
Summary
Ocean is an important source of forcing the anomalous change of atmospheric circulation. The study of air-sea interaction at high latitudes is relatively weak compared with those of the middle and low latitudes, such as how the cold air source sea area affected the circulation and the climate of eastern China, so further study is needed to reveal them. 2) In the east of the Novaya Zemlya Ocean, the cold air is mostly through the Kara Sea, Russia into China. As a source of cold air that was likely to cause strong and frequent impacts on China; the Barents Sea thermal condition affected the winter climate in China by influencing the atmospheric circulation and the cold high-pressure. Wu et al [9] found that there is an inverse change between the autumn and winter Arctic sea ice distribution anomaly and the Siberian high-pressure in winter, and there was consistency about the sea ice change between the Greenland Sea and the East-West sea of Novaya Zemlya (Barents Sea and Kara Sea). We studied the influence of the Barents Sea SST in autumn on climate in eastern China and its mechanism by analyzing the persistence of the Barents Sea SST in autumn and the relationship between the Barents Sea SST in autumn and the sea level pressure, atmospheric circulation in northeast China
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