Weaker land-atmosphere coupling in global storm-resolving simulation

被引:0
作者
Lee, Junhong [1 ]
Hohenegger, Cathy [1 ]
机构
[1] Max Planck Inst Meteorol, D-20146 Hamburg, Germany
关键词
land-atmosphere coupling; soil moisture-precipitation feedback; storm-resolving model; explicit convection; MOISTURE-PRECIPITATION FEEDBACK; SOIL-MOISTURE; PART I; INITIATION; GLACE;
D O I
10.1073/pnas.2314265121
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The debate on the sign of the soil moisture-precipitation feedback remains open. On the one hand, studies using global coarse-resolution climate models have found strong positive feedback. However, such models cannot represent convection explicitly. On the other hand, studies using km-scale regional climate models and explicit convection have reported negative feedback. Yet, the large-scale circulation is prescribed in such models. This study revisits the soil moisture-precipitation feedback using global, coupled simulations conducted for 1 y with explicit convection and compares the results to coarse-resolution simulations with parameterized convection. We find significant differences in a majority of points with feedback that is weaker and dominantly negative with explicit convection. The model with explicit convection is more often in a wet regime and prefers the triggering of convection over dry soil in the presence of soil moisture heterogeneity, in contrast to the coarse-resolution model. Further analysis indicates that the feedback not only between soil moisture and evapotranspiration but also between evapotranspiration and precipitation is weaker, in better agreement with observations. Our findings suggest that coarse-resolution models may not be well suited to study aspects of climate change over land such as changes in droughts and heatwaves.
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页数:7
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