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根据各拉丹冬冰芯重建了该地区近70a来积累量的时间序列.冰芯积累量与邻近区域气象台站的降水量存在显著的正相关性,表明冰芯积累量可以作为该地区降水量的代用指标.1930s中期至1960s初期,各拉丹冬地区的降水量处于一个低值期,并于1950s末期达到了极低值.自1960s开始,降水量急剧上升,进入1990s后,降水量有下降趋势,但仍然高于1930s~1950s.利用Mann-Kendall方法检测出该地区降水量在1967年发生了一次突变,即由低降水期转为高降水期.大气环流特征的分析表明,高降水期的西南夏季风比低降水期北扩了约2个纬度,且巴尔喀什湖槽在高降水期明显增强,同时经向风和水汽输送在高降水期也显著增强.
According to the ice core of Lardongdong, the time series of the accumulation in the past 70 years have been reconstructed.The ice core accumulation has a significant positive correlation with the precipitation in the meteorological stations in the adjacent area, indicating that the ice core accumulation can be used as the precipitation in this area Of the proxy indicators .1930s to the early 1960s, the precipitation in each of the Lardun Dong region at a low period, and in the late 1950s reached a very low value. Since 1960s, the precipitation rose sharply, into the 1990s, the precipitation has But still higher than 1930s ~ 1950s. The Mann-Kendall method was used to detect a sudden change in the precipitation in 1967, ie from low precipitation to high precipitation. The analysis of the characteristics of the atmospheric circulation shows that the high precipitation The southwesterly summer monsoon expanded about 2 latitudes northward during the low rainfall period, and the Balkhash lacustrine channel increased significantly during the high precipitation period. At the same time, the meridional wind and water vapor transport increased significantly during the high precipitation period.