Abstract

The long-term variability of the Black Sea intermediate layer temperature is analyzed using an updated database for the period from 1951 to 2017. The existence of interdecadal temperature variations in the vicinity of the cold intermediate layer (CIL) with a period of ~50 years and the amplitude to 0.7°C is confirmed. It is shown that the CIL cooling/warming is accompanied by its upward/downward displacement. The analysis of temperature fields in the surface and subsurface layers constructed from data averaged over different decades revealed that the cold and warm climate periods are characterized by changes in the ratio between the intensity of the two main CIL sources: winter convection in the open sea and subduction of cold water from the northwestern shelf. A dramatic sea surface temperature rise during the recent 20 years led to the fact that currently observed temperature minima in the upper 100-m layer considerably exceeded the minima registered during the period of the previous quasiperiodic temperature rise in the mid-20th century.

中文翻译：

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黑海冷中间层年代际变化及其成因

摘要

使用更新后的数据库对1951年至2017年期间的黑海中间层温度的长期变化进行了分析。在大约50年的冷中间层（CIL）附近存在年代际温度变化并且确认到0.7℃的振幅。结果表明，CIL的冷却/升温伴随着其向上/向下位移。根据数十年来平均数据构建的表层和地下层温度场的分析表明，寒冷和温暖的气候时期的特征在于两种主要CIL来源强度的比率变化：公海冬季对流和从西北大陆架俯冲冷水。