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本文主要通过相关统计分析,研究了7月各海区海冰与同期上空500hPa高度场的关系及其与后期翌年1月北半球500hPa大气环流的联系,对翌年1月亚洲中高纬地区气温趋势的可能影响在此也作了讨论。结果表明:7月北极海冰与其同期上空500hPa高度存在着较好的负相关关系。其中,尤以Ⅰ、Ⅱ海区负相关关系更好。在北极各海区中,以7月第Ⅲ海区海冰与后期翌年1月北半球500hPa大气环流联系较为密切。主要表现为,7月Ⅱ海区海冰M指数高(即冰情重)时,翌年1月北欧低槽及东亚大槽偏弱,并多伴随着乌拉尔山阻塞形势的破坏过程。7月Ⅱ海区海冰M指数低(即冰情轻)时,翌年1月北欧低槽及东亚大槽偏强,多伴随着乌拉尔山阻塞形势的建立过程。7月Ⅱ海区冰情重时,亚洲中、高纬地区1月气温多偏低,反之多偏高。
In this paper, we mainly study the relationship between the sea ice over the sea area in July and the 500hPa geopotential height over the same period in the year and its relationship with the 500hPa atmospheric circulation in the northern hemisphere in January of the following year. The possible influence of the sea ice on the temperature trend in mid- Also discussed here. The results show that there is a good negative correlation between the July Arctic sea ice and its 500hPa over the same period. Among them, especially the negative correlation between sea areas I and II is better. In Arctic sea areas, sea ice in Zone III of July was more closely linked with the 500hPa atmospheric circulation in northern hemisphere in January of the following year. The main manifestation is that in July Ⅱ sea area where sea ice M index is high (ie heavy ice), in January next year, the Nordic low trough and the East Asian trough weaker, and more with the Ural Mountains obstruction of the destruction process. In July Ⅱ, when sea ice M index was low (ie, light ice conditions), in January the following year, the northern Europe low trough and East Asia trough were stronger, mostly accompanied by the establishment of the Ural Mountains obstruction. In July II, when the sea ice was heavy, the temperatures in January and mid-high latitudes in Asia were mostly low, and on the contrary, they were mostly high.