non-linear intensification of sahel rainfall as a possible dynamic response to future warming

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ID: 244674
2017
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Abstract
Projections of the response of Sahel rainfall to future global warming diverge significantly. Meanwhile, paleoclimatic records suggest that Sahel rainfall is capable of abrupt transitions in response to gradual forcing. Here we present climate modeling evidence for the possibility of an abrupt intensification of Sahel rainfall under future climate change. Analyzing 30 coupled global climate model simulations, we identify seven models where central Sahel rainfall increases by 40 to 300 % over the 21st century, owing to a northward expansion of the West African monsoon domain. Rainfall in these models is non-linearly related to sea surface temperature (SST) in the tropical Atlantic and Mediterranean moisture source regions, intensifying abruptly beyond a certain SST warming level. We argue that this behavior is consistent with a self-amplifying dynamic–thermodynamical feedback, implying that the gradual increase in oceanic moisture availability under warming could trigger a sudden intensification of monsoon rainfall far inland of today's core monsoon region.
Reference Key
schewe2017earthnon-linear Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;J. Schewe;A. Levermann;A. Levermann;A. Levermann
Journal itinéraires
Year 2017
DOI
10.5194/esd-8-495-2017
URL
https://www.earth-syst-dynam.net/8/495/2017/esd-8-495-2017.pdf
Keywords
sciencegeologydynamic and structural geology

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