Abstract

The influence of two climate modes (North Atlantic Oscillation (NAO) and East Atlantic pattern (EA)) on the wind stress curl (WSC) over the Black Sea, which determines the intensity of water circulation, is investigated using the MERRA2 reanalysis wind data and NAO and EA indices for 1980–2019. The composite method taking into account the nonstationarity of the time series of the NAO and EA indices is used. It is shown that in some months of the summer-autumn period during the positive phase of NAO, there is a significant increase in the cyclonic WSC over the eastern part of the sea. The highest influence of the EA on the WSC over the Black Sea is observed in November to April: during the negative EA phase, the cyclonic WSC increases over most of the Black Sea area. Such increase should lead to an intensification of the Black Sea water circulation. It is confirmed that the EA has a greater effect on the WSC over the Black Sea than the NAO.

中文翻译：

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北大西洋涛动和东大西洋模式对黑海风应力卷曲的影响

摘要

使用 MERRA2 再分析风数据研究了两种气候模式（北大西洋涛动 (NAO) 和东大西洋模式 (EA)）对决定水循环强度的黑海风应力旋度 (WSC) 的影响以及 1980-2019 年的 NAO 和 EA 指数。使用考虑了NAO和EA指数时间序列非平稳性的复合方法。结果表明，在NAO正相位的夏秋季节的某些月份，东部海域的气旋WSC显着增加。11 月至 4 月观察到 EA 对黑海 WSC 的最大影响：在 EA 负阶段，气旋 WSC 在黑海大部分地区增加。这种增加应该导致黑海水循环的加强。