作　　者： ; ; ; ; ;

机构地区： 华南师范大学地理科学学院

出　　处： 《华南师范大学学报（自然科学版）》 2012年第3期120-127,共8页

摘　　要： 根据2007年11月至2008年3月广州降水中稳定同位素和气象资料,探讨了短时间尺度下降水中稳定同位素变化规律.采样期间所得到的降水中稳定同位素与气温在天气尺度下呈显著的正相关,可能与2008年初南方发生严重冰雪冻雨灾害期间特殊的大气环流形势、水汽输送等因素有关.在单次连续降水过程中,降水中稳定同位素变化过程主要有2类,一类是随着降水的持续,降水中稳定同位素逐渐降低,另一类则是降水中稳定同位素变化表现出"V"型结构,且降水中过量氘(d)的变化与同位素变化趋势相近,这些不同类型的同位素组成变化趋势可能跟水汽来源、锋面活动、雨滴下落过程中所受到的蒸发分馏等有关. Based on the stable isotope （δD, δ^1880） in precipitation selected at March 2008 and the meteorological data, the isotopic variations of precipitation Guangzhou from November 2007 to at short - time scales was analyzed. On the daily time -scale, there is a significantly positive relation between the 81SO and 8D in precipitation with the daily air temperature, and this could be correlated to the occurrence of the severe cold surge, ice - snow and frozen disasters in the south China at the beginning of 2008. We also find that there are mainly two kinds of the isotopic changing tendency during one single precipitation process. One kind is an obvious declining pattern during the con- tinuance of the rainfall process, and another kind is a ＂V＂ pattern during the rainfall process, and it is quite simi- lar with the variation of its d - excess. We concluded primarily that these different kinds of isotopic variation patterns were probably correlated to the water sources, frontal activities, evaporation, dephlegmation processes and etc.

关 键 词： 降水中稳定同位素 短时间尺度 水循环

领　　域： [天文地球]