Global hydroclimatic drivers of terrestrial water storage changes in different climates
Global hydroclimatic drivers of terrestrial water storage changes in different climates
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DOI：
10.1016/j.catena.2022.106598
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发表时间：
2022-12
期刊：
影响因子：
6.2
通讯作者：
Xu Zhang;Jinbao Li;Zifeng Wang;Q. Dong
中科院分区：
文献类型：
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作者：
Xu Zhang;Jinbao Li;Zifeng Wang;Q. Dong
摘要重力恢复与气候实验（GRACE）使命提供了一种前所未有的方法来评估全球陆地水储量变化（TWSC）。然而，水文气候驱动因素的GRACE派生TWSC在不同的气候没有得到系统的检查，这阻碍了其在水资源管理和水文模型开发的应用。利用GRACE数据集计算了2003 - 2019年的月TWSC，并在Köppen-Geiger世界气候分类系统下分析了TWSC与降水量（P）、蒸散量（ET）、径流量（R）和温度（T）的偏相关关系。四个水文气候要素（P，ET，R，和T）TWSC的相对贡献进行了量化使用分层分区方法。结果表明，在热带气候、炎热半干旱气候和冬季干燥的温带和大陆性气候条件下，磷主要控制水溶性碳。ET是中高纬度地区TWSC的主要驱动因素，这些地区具有温带和大陆性气候，没有旱季，亚北极气候和极地气候。T主要影响寒冷干旱气候、夏季干燥或无干燥季节的温带和大陆性气候以及冰盖气候下的TWSC。然而，在北回归线和南回归线附近的许多干旱气候的TWSC没有很好地解释所有四个水文气候变量根据其不显着的偏相关。在南美洲，加拿大西部，美国东部毗连，非洲，这可能是由于显着的变化P基于其相似的空间格局在年度TWSC的大趋势。特别是，在大多数大陆性气候中发现TWSC减少，这表明这些地区的水资源可用性恶化。总体而言，我们的研究结果澄清了全球范围内不同气候条件下TWSC的主要水文气候驱动因素，这可能有助于通过明智地选择不同气候条件下的解释性水文气候变量来改善TWSC建模和预测。
Abstract The Gravity Recovery and Climate Experiment (GRACE) mission provides an unprecedented way to assess terrestrial water storage changes (TWSC) worldwide. However, hydroclimatic drivers of GRACE-derived TWSC in different climates have not been systematically examined, which hinders its applications in water resources management and hydrological model development. In this study, we derived the monthly TWSC using the GRACE dataset, and analyzed its partial correlations with precipitation (P), evapotranspiration (ET), runoff (R), and temperature (T) from 2003 to 2019 under the Köppen-Geiger world climate classification system. Relative contributions of the four hydroclimatic elements (P, ET, R, and T) to TWSC were quantified using the hierarchical partitioning method. The results indicate that P mainly controls TWSC in tropical climates, hot semi-arid climate, and temperate and continental climates with dry winter. ET is the primary driver of TWSC in mid-and high-latitude regions that feature temperate and continental climates with no dry season, subarctic climates, and polar climates. T mainly influences TWSC in cold arid climates, temperate and continental climates with dry summer or no dry season, and ice cap climate. However, TWSC in many arid climates near the Tropic of Cancer and the Tropic of Capricorn are not well explained by all four hydroclimatic variables according to their non-significant partial correlations. Large trends in annual TWSC are found in South America, western Canada, eastern contiguous United States, and Africa, which are likely due to marked changes in P based on their similar spatial pattern. In particular, decreasing TWSC are found in most continental climates, which manifests a deterioration of water resources availability in these regions. Overall, our results clarify the major hydroclimatic drivers of TWSC in different climates at a global scale, which may help improve TWSC modeling and prediction through a judicious selection of explanatory hydroclimatic variables in different climates.