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喜马拉雅山中段希夏邦马达索普冰芯及冰川融水中的过量氘显著异常,其值远远高于全球降水中过量氘均值及周围地区降水中过量氘值.附近站点聂拉木连续一年以上降水中过量氘的变化揭示了这一异常现象.研究发现这一异常与该地区降水的水汽来源地的季节变化有关.发现在季风爆发期,该地区降水受西南季风影响,过量氘的值与其他受海洋水汽来源的地区一样,为低值;而在非季风月份,水汽以西风输送为主,降水中过量氘为高值.而且在该地区冬春季降水占全年降水的比例较大,结果使得该地区整年平均降水中过量氘的值显著高于青藏高原南部其他地区.这一结论对该地区的冰芯研究有重要意义,表明喜马拉雅山中段冰芯的水汽来源并非全部来源于西南季风的水汽输送,而西风水汽输送占有很大比例.
In the middle Himalayas, the excess deuterium in the ice core of Matthod and the ice melt of glaciers is significantly abnormal, which is much higher than the excess deuterium in the global precipitation and excess deuterium in the precipitation in the surrounding areas. The change of excess deuterium reveals this anomaly, and the study found that this anomaly is related to the seasonal variation of the source of precipitation in the area, and it is found that during the monsoon onset, the precipitation in this area is affected by the southwest monsoon. In the non-monsoon month, the water vapor is dominated by westerly winds and the excess deuterium in precipitation is high, and the proportion of precipitation in winter and spring in this area is larger than that in the whole year. As a result, Making the value of excess deuterium in the mean annual precipitation in the area significantly higher than that of other areas in the southern part of the Qinghai-Tibet Plateau.This conclusion is of great significance to the study of ice cores in the region, indicating that not all water vapor from the central Himalayas comes from the southwest monsoon Of the water vapor transport, while the West wind and water vapor transport account for a large proportion.