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Understanding Mega Droughts in North America: The Role of Biosphere-Atmosphere Feedbacks

This study investigates the impacts of biosphere-atmosphere feedbacks on mega droughts in North America, particularly focusing on the Southwest region. Climate models indicate warming and drying trends due to shifting storm tracks and subtropical high expansion. We test two hypotheses: the amplification of droughts through surface and subsurface processes influencing land-atmosphere interactions, and the role of dust emissions from mega droughts affecting North American monsoon circulation. Utilizing CMIP3 pre-industrial simulations, our work include dynamic groundwater components to simulate its feedbacks to the atmosphere.

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Understanding Mega Droughts in North America: The Role of Biosphere-Atmosphere Feedbacks

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  1. IMPACTS: Mega Droughts in North America: The Role of Biosphere-Atmosphere FeedbacksLab Personnel: L. Ruby Leung and Xiaohong Liu (PNNL); Celine Bonfils and Tom Philips (LLNL) • Climate models projected warming/drying in the Southwest due to a northward shift of storm tracks and expansion of subtropical high in the mid-latitudes • We propose to test two hypotheses related to the role of biosphere-atmosphere feedbacks on mega drought in North America - We hypothesize that droughts may be prolonged or amplified through surface and subsurface processes and the subsequent influence on land-atmosphere interactions - We also hypothesize that atmospheric heating due to dust emissions from the mega droughts will have a significant influence on the North American monsoon circulation Diagnostics Study of Droughts Using CMIP3 Pre-Industrial “Control” Simulations Implemented a Dynamic Groundwater Component in a Regional Climate Model to Simulate Groundwater Table Dynamics and its Feedbacks to the Atmosphere

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