变化环境下青藏高原陆地水储量演变格局及归因

基于1981—2015年全球陆面数据同化系统GLDAS和归一化植被指数GIMMS NDVI3g等多源数据，采用Theil-Sen Median斜率估计和Mann-Kendall趋势检验法探究青藏高原多年陆地水储量(TWS)及其各组分时空演变特征，采用水量平衡法、相关分析法和Hurst指数法识别水循环过程对TWS变化的影响机制。结果表明：受气候变化影响，1981—2015年青藏高原降水及冰川积雪消融增加，TWS以0.7 mm/a的速率增加，青藏高原北部TWS增加趋势极其显著，南部呈减少特征；青藏高原绝大部分地区TWS以0～200 cm的土壤含水量为主，不同深度土壤含水量具有显著空间异质性；青藏高原北部及东部降水主要通过蒸散发过程损失，南部地区径流系数较大。

Evolution pattern and attribution analysis of terrestrial water storage in Tibetan Plateau under changing environment

Based on the multi-source datasets, including GLDAS and GIMMS NDVI3g during the period of 1981 to 2015, the spatiotemporal pattern of terrestrial water storage (TWS) and its components in Tibetan Plateau were investigated with Theil-Sen Median slope estimator and Mann-Kendall trend test, and the influence mechanism of hydrological cycle process on the changing trend of TWS was identified using the water balance method, correlation analysis, and Hurst index method. The results showed that the precipitation and melting of glacier snow increased, and TWS increased at a rate of 0.7 mm per year due to climate change during the period of 1981 to 2015; TWS of Tibetan Plateau increased significantly in northern parts, while decreased in southern parts; in most areas of Tibetan Plateau, TWS mainly consisted of soil moisture at the depth of 0 to 200 cm, and the soil moisture of different layers had significant spatial heterogeneity; precipitation in northern and eastern Tibetan Plateau was mainly lost through evapotranspiration, and the runoff coefficient in southern parts was larger than that in other regions.