Abstract

This paper aims to evaluate spatiotemporal variability of the mean sea level pressure trends over the Black Sea using the gridded 40-year (1979-2018) reanalysis mean sea level pressure data from two different datasets. These datasets are the European Centre for Medium-Range Weather Forecasts ERA-Interim with a spatial resolution of 0.25° and temporal resolution of six hours, and the National Centers for Environmental Prediction/Climate Forecast System Reanalysis with a spatial resolution of 0.5° and temporal resolution of one hour. Data from both databases show that the mean sea level pressure tends to decrease towards the recent years over the entire Black Sea. The long-term averages of mean sea level pressure reflect the spatial variability over the Black Sea with much lower pressures in the eastern part of the Black Sea than that on the western side. The long-term variation is more intense in the eastern part of the Black Sea. Sea Level Anomaly over the Black Sea, spanning 26 years between 1993 and 2018, was analyzed using satellite altimetry data. It was found that there is a high Sea Level Anomaly where the mean sea level pressure is low, described by an inverted barometer response. The 39-year long Sea Surface Temperature Anomaly data (1981-2018) indicate the rising tendency in sea surface temperature towards recent years in the entire Black Sea. An inverse relationship is found between North Atlantic Oscillation index and sea surface temperature anomaly. On a seasonal scale, mean sea level pressure in winter (high-pressure system) is larger than that in summer (low-pressure system). Our analyses show that mean sea level pressure tends to decrease, sea surface temperature anomaly and sea surface temperature anomaly tends to increase in recent years over the Black Sea.

抽象的

本文旨在使用来自两个不同数据集的40年网格（1979-2018）重新分析平均海平面压力数据来评估黑海平均海平面压力趋势的时空变化。这些数据集是欧洲中距离天气预报中心ERA-Interim，空间分辨率为0.25°，时间分辨率为6个小时，以及国家环境预测/气候预报系统再分析中心，其空间分辨率为0.5°，时间分辨率为一小时的分辨率。来自这两个数据库的数据均表明，近几年来，整个黑海的平均海平面压力趋于下降。海平面平均压力的长期平均值反映了黑海的空间变异性，黑海东部的压力远低于西侧。黑海东部地区的长期变化更为剧烈。使用卫星测高仪数据分析了1993年至2018年之间长达26年的黑海海平面异常。发现存在高海平面异常，平均海平面压力较低，这通过气压计的反演来描述。39年之久的海面温度异常数据（1981-2018年）表明，整个黑海海面温度在近几年呈上升趋势。在北大西洋涛动指数与海面温度异常之间发现反比关系。在季节性范围内，冬季（高压系统）的平均海平面压力要大于夏季（低压系统）的平均海平面压力。我们的分析表明，近年来黑海的平均海平面压力趋于降低，海表温度异常和海表温度异常趋于增加。