Changes in cloudiness contribute to changing seasonality in the Baltic Sea region

IF 2.6 3区地球科学 Q2 OCEANOGRAPHY

Oceanologia Pub Date : 2024-01-01 DOI:10.1016/j.oceano.2023.11.004

Piia Post , Margit Aun

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Abstract

In the Baltic Sea region, a significant increase in solar radiation has been detected during the past half-century. Changes in shortwave irradiance are associated with atmospheric transparency and cloudiness parameters like cloud fraction and albedo. One of the most important reasons for day-to-day changes in cloudiness is the synoptic-scale atmospheric circulation; thus, we look for reasons for solar radiation trends due to changes in atmospheric circulation. We analysed regional time series and trends from satellite-based cloud climate data record CLARA-A2 for the Baltic Sea region in 1982–2018. As the rise in solar radiation depends on the seasonally averaged values of total fractional cloud cover (CFC), surface incoming shortwave radiation (SIS) and occurrences of circulation types were analysed. We show that the shift in seasonality connected to the earlier accumulated sums of SIS is at least partly explained by the changes in synoptic-scale atmospheric circulation.

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云量变化导致波罗的海地区季节性不断变化

在过去半个世纪中，波罗的海地区的太阳辐射显著增加。短波辐照度的变化与大气透明度和云量参数（如云量和反照率）有关。云量逐日变化的最重要原因之一是同步尺度的大气环流；因此，我们要寻找大气环流变化导致太阳辐射趋势的原因。我们分析了 1982-2018 年波罗的海地区基于卫星的云气候数据记录 CLARA-A2 的区域时间序列和趋势。由于太阳辐射的增加取决于总分云量（CFC）的季节平均值，因此我们分析了地表入射短波辐射（SIS）和环流类型的出现。我们的研究表明，与较早的 SIS 累积总和相关的季节性变化至少可以部分解释为同步尺度大气环流的变化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Oceanologia 地学-海洋学

CiteScore

5.30

自引率

6.90%

发文量

审稿时长

146 days

期刊介绍： Oceanologia is an international journal that publishes results of original research in the field of marine sciences with emphasis on the European seas.