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Atmospheric Precipitation Within the Selenga River Basin and Large-Scale Atmospheric Circulation Over Eurasia in July
Geography and Natural Resources Pub Date : 2019-10-01 , DOI: 10.1134/s1875372819040097 O. Yu. Antokhina
Geography and Natural Resources Pub Date : 2019-10-01 , DOI: 10.1134/s1875372819040097 O. Yu. Antokhina
Data from the Global Precipitation Climatology Centre (GPCC) were used in investigating long-term variability of anomalies of the total amount of atmospheric precipitation within the Selenga river basin in July. We identified several long periods (four years and longer) with negative precipitation anomalies: 1935–1939, 1955–1958, 1977–1981, 2007–2011, and 2013–2017. The last period is characterized by the smallest precipitation amount. Day-to-day variations in total precipitation were also analyzed for each July from 1982 to 2016. The analysis revealed a tendency to a decrease of the number of days with a large precipitation amount and to an increase of dry periods. Based on ECMWF Era Interim data, we examined the features in the atmospheric blocking Europe, Siberia and the Far East for periods with large and small precipitation amounts within the Selenga river basin. To identify the blocking in the atmosphere used the southern gradient of the geopotential. It was shown that in periods with large precipitation amounts blockings occurred most frequently over Eastern Siberia and more rarely over Europe and the Far East (especially if they were accompanied by blocking over Western Siberia). Atmospheric precipitation within the Selenga basin is associated not only with blocking but also with the position of the jet stream and with dynamic blocking formation schemes. The significance of these factors has been demonstrated in a number of specific situations of the atmospheric circulation in years with large and small precipitation amounts within the Selenga basin. Long-term transformations of these characteristics caused by climate change and the general atmospheric circulation can lead to a disturbance of the correlations between blocking and precipitation amounts within the river basin. In all likelihood, the correlation of blocking with precipitation regimes, rather than with precipitation in the region, will be more rigid. A functional dependence of the Selenga flow on climate change appears to be determined by the position of the monsoon front and by the wave properties of atmospheric flows in midlatitudes.
中文翻译:
7月色楞格河流域大气降水与欧亚大陆大规模大气环流
来自全球降水气候学中心 (GPCC) 的数据被用于调查色楞格河流域 7 月大气降水总量异常的长期变化。我们确定了几个长期(四年或更长时间)的负降水异常:1935-1939、1955-1958、1977-1981、2007-2011 和 2013-2017。最后一个时期的特点是降水量最少。还分析了1982年至2016年每年7月总降水量的逐日变化。分析表明,降水量大的天数有减少的趋势,干旱期有增加的趋势。基于 ECMWF Era Interim 数据,我们检查了欧洲大气阻塞的特征,西伯利亚和远东在色楞格河流域内降水量大或小的时期。为了识别大气中的阻塞,使用了地势的南部梯度。结果表明,在降水量大的时期,东西伯利亚最常发生阻塞,而欧洲和远东则很少发生(特别是如果它们伴随着西西伯利亚的阻塞)。色楞格盆地内的大气降水不仅与阻塞有关,而且与喷射流的位置和动态阻塞形成方案有关。这些因素的重要性已在色楞格盆地内降水量大或少的年份的大气环流的许多特定情况中得到证明。气候变化和大气环流引起的这些特征的长期变化会导致流域内阻塞与降水量之间的相关性受到干扰。很有可能,阻塞与降水状况的相关性,而不是与该地区降水的相关性,将更加严格。色楞格气流对气候变化的函数依赖性似乎由季风锋的位置和中纬度大气流动的波浪特性决定。而不是带降水的地区,会更加僵硬。色楞格气流对气候变化的功能依赖性似乎由季风锋的位置和中纬度大气流动的波浪特性决定。而不是带降水的地区,会更加僵硬。色楞格流对气候变化的函数依赖性似乎由季风锋的位置和中纬度大气流的波浪特性决定。
更新日期:2019-10-01
中文翻译:
7月色楞格河流域大气降水与欧亚大陆大规模大气环流
来自全球降水气候学中心 (GPCC) 的数据被用于调查色楞格河流域 7 月大气降水总量异常的长期变化。我们确定了几个长期(四年或更长时间)的负降水异常:1935-1939、1955-1958、1977-1981、2007-2011 和 2013-2017。最后一个时期的特点是降水量最少。还分析了1982年至2016年每年7月总降水量的逐日变化。分析表明,降水量大的天数有减少的趋势,干旱期有增加的趋势。基于 ECMWF Era Interim 数据,我们检查了欧洲大气阻塞的特征,西伯利亚和远东在色楞格河流域内降水量大或小的时期。为了识别大气中的阻塞,使用了地势的南部梯度。结果表明,在降水量大的时期,东西伯利亚最常发生阻塞,而欧洲和远东则很少发生(特别是如果它们伴随着西西伯利亚的阻塞)。色楞格盆地内的大气降水不仅与阻塞有关,而且与喷射流的位置和动态阻塞形成方案有关。这些因素的重要性已在色楞格盆地内降水量大或少的年份的大气环流的许多特定情况中得到证明。气候变化和大气环流引起的这些特征的长期变化会导致流域内阻塞与降水量之间的相关性受到干扰。很有可能,阻塞与降水状况的相关性,而不是与该地区降水的相关性,将更加严格。色楞格气流对气候变化的函数依赖性似乎由季风锋的位置和中纬度大气流动的波浪特性决定。而不是带降水的地区,会更加僵硬。色楞格气流对气候变化的功能依赖性似乎由季风锋的位置和中纬度大气流动的波浪特性决定。而不是带降水的地区,会更加僵硬。色楞格流对气候变化的函数依赖性似乎由季风锋的位置和中纬度大气流的波浪特性决定。