Negative soil moisture-precipitation feedback in dry and wet regions.
作者： Lingbin Yang , Guoqing Sun , Lu Zhi , Jianjun Zhao
DOI: 10.1038/S41598-018-22394-7
关键词: Climate change 、 Evapotranspiration 、 Atmospheric sciences 、 Water content 、 Environmental science 、 Negative feedback 、 Observation data 、 Satellite remote sensing 、 Arid 、 Precipitation
摘要: Soil moisture-precipitation (SM-P) feedback significantly influences the terrestrial water and energy cycles. However, sign of associated physical mechanism have been debated, leaving a research gap regarding global climate changes. Based on Koster's framework, we estimate SM-P using satellite remote sensing ground observation data sets. Methodologically, is identified by correlation between monthly soil moisture next-month precipitation. The investigated through coupling precipitation (P-SM), ad evapotranspiration (SM-E) (E-P) correlations. Our results demonstrate that although positive predominant over land, non-negligible negative occurs in dry wet regions. Specifically, 43.75% 40.16% arid humid zones. Physically, depends SM-E correlation. In regions, change limited. We conclude complex cause varies based environmental climatic conditions.
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