气候暖湿化评价指数构建及在青海省的应用

Construction of climate warming and humidification evaluation index and its application in Qinghai Province

综合气象要素、干旱指标与植被指数构建了气候暖湿化评价指数,利用地表湿润指数(Hi)、自校核帕尔默干旱指数(sc_PDSI)与年度归一化植被指数(NDVI),基于数据归一化方法构建气候暖湿化等级评价指数;并应用该类指数综合评价了近60 a来青海省气候暖湿现象的时空分布等级变化,以验证该类指数在不同时间序列长度及涵盖不同因素时的适用性。评价结果表明:(1)青海省近60 a总体气候处于显著暖化与微湿润化阶段;其中显著暖湿化区域集中于东南部祁连山部分地区、黄河流域南部至东南部与澜沧江流域地区;(2)近60 a气候变化并未改变青海省的气候暖湿及水资源分布格局;(3)该类指数对于区域长时间尺度下气候暖湿化趋势评价具有良好的适用性与实用性,能客观及时地反映评价区域气候暖湿化状况。

Different methods have different research results on the duration and variation of this phenomenon,causing dissidence.In this paper,the evaluation index of climate warming and humidification was constructed by combining meteorological factors and drought and vegetation indexes.The surface moisture index(Hi),selfchecking Palmer drought index(sc_PDSI),and annual NDVI were used to construct the evaluation index of the warming and humidification grade based on the method of data normalization.This kind of index was used to comprehensively evaluate the spatial and temporal distribution of climate warming and humidity in Qinghai Province over the past 60 years to verify the applicability of the index in different time series lengths and cover different factors.The evaluation results show the following:(1)the overall climate of Qinghai Province over the past 60 years is in the stage of obvious indigenous warming and micro-humidifying.The affected regions are concentrated in parts of the Qilian Mountains in the southeast,southern to the southeast of the Yellow River Basin and Lancang River Basin.(2)Climate change has not changed the distribution pattern of climate warming and water resources in Qinghai Province over the past 60 years.(3)This kind of index has positive applicability for regional long-time scale warming and humidifying evaluation and can objectively and timely reflect the warming and humidifying situation of the evaluation area.