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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Precipitation over Greenland and its relation to the North Atlantic Oscillation
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Precipitation over Greenland and its relation to the North Atlantic Oscillation

机译：格陵兰的降水及其与北大西洋涛动的关系

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摘要

The #omega# equation method based on an equivalent isobaric geopotential height in #sigma# coordinates has been used to retrieve the precipitation over Greenland. This approach is designed to accurately represent the topographic effects of the Greenland Ice Sheet on atmospheric motion and precipitation. The 11 year mean precipitation from 1985 to 1996 over all of Greenland is 276 mm Yr~(-1), which is close to the long-term mean precipitation of 346 mm yr~(-1) estimated from glaciological data. The precipitation over all of Greenland shows that the largest value in 1986 is 472 mm yr~(-1) and the smallest value I 1995 is 309 mm yr~(-1). The major interannual variability of the atmospheric circulation in the North Atlantic can be represented by the variation of the North Atlantic Oscillation (NAO) index, which is most pronounced during winter. It is found that if the NAO index increases, the total precipitation over Greenland decreases, and vice versa. The correlation coefficient between these two series for 1985-1995 is -0.75. The mean precipitation over southern Greenland, where the majority of precipitation falls, is more closely related to the NAO index in winter, and their correlation coefficient is -0.80. This relationship can be understood from the composite maps of sea level pressure and Greenland precipitation for the high and low index months. During months of high NAO index values, the Icelandic low is strong. During months of low NAO index values, the monthly mean low is located to the southwest of Greenland over the Labrador Sea. Precipitation amounts over the southeast coast of Greenland are about 100 mm larger during the low NAO index months than the high NAO index months. Precipitation over all of Greenland during the low NAO index months is higher. There are significant downward trends in annual precipitation from 1985-1995 for all of Greenland and its southern and central west coastal regions, amounting to about 3% per year.
机译：已使用基于＃sigma＃坐标中的等压等压地势高度的＃omega＃方程法来检索格陵兰岛上的降水。该方法旨在准确地表示格陵兰冰原对大气运动和降水的地形影响。 1985年至1996年，整个格陵兰岛的11年平均降水量为276 mm Yr〜（-1），接近根据冰川学数据估计的346 mm yr〜（-1）的长期平均降水量。格陵兰岛的降水表明，1986年的最大值为472 mm yr〜（-1），I 1995的最小值为309 mm yr〜（-1）。北大西洋大气环流的主要年际变化可以通过北大西洋涛动指数（NAO）的变化来表示，该指数在冬季最为明显。发现如果NAO指数增加，格陵兰岛的总降水量减少，反之亦然。 1985-1995年这两个系列之间的相关系数是-0.75。格陵兰南部的平均降水量（降水量最多的地区）在冬季与NAO指数关系更为密切，其相关系数为-0.80。可以从高指数月和低指数月的海平面压力和格陵兰岛降水的综合图上理解这种关系。在NAO指数高的月份中，冰岛的低点很强。在NAO指数值低的月份中，月平均低值位于格陵兰西南部的拉布拉多海上方。在NAO指数低的月份，格陵兰岛东南沿海地区的降水量比NAO指数高的月份大100毫米。在NAO指数较低的月份中，格陵兰岛的降雨量更高。从1985年至1995年，格陵兰及其南部和中西部沿海地区的年降水量都有明显的下降趋势，每年约3％。

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