The impact of soil moisture-atmosphere coupling on daily maximum surface temperatures in Southeastern South America - Archive ouverte HAL Access content directly
Journal Articles Climate Dynamics Year : 2020

The impact of soil moisture-atmosphere coupling on daily maximum surface temperatures in Southeastern South America

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1
Tanea Coronato
  • Function : Author
Andrea F. Carril
  • Function : Author
Pablo G. Zaninelli
  • Function : Author
Julián Giles
  • Function : Author
Romina Ruscica
  • Function : Author
Magdalena Falco
  • Function : Author
Anna A. Sörensson
  • Function : Author
Lluis Fita
  • Function : Author
Claudio G. Menéndez
  • Function : Author

Abstract

Based on a series of experiments conducted by two regional climate models (RCA4 and LMDZ) with and without soil moisture-atmosphere coupling, we investigate the role of soil moisture on the occurrence of surface air temperature extremes and its persistence in Southeastern South America. Our analysis reveals that both factors, soil moisture-atmosphere coupling and relatively drier soil conditions, enhance the temperature extremes. In addition, the existence of soil-atmosphere coupling and the associated soil moisture variability is crucial for the development of the extremes in SESA. The key role of soil-atmosphere coupling is also reflected in the intrinsic persistence of hot days, which is greater in simulations with interactive soil moisture than in those with prescribed soil conditions. In the absence of soil-atmosphere coupling, the imprint of the anomalous dry (and also wet) soil conditions on the intensity and persistence of hot days is weaker.
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Dates and versions

insu-03726976 , version 1 (19-07-2022)

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Tanea Coronato, Andrea F. Carril, Pablo G. Zaninelli, Julián Giles, Romina Ruscica, et al.. The impact of soil moisture-atmosphere coupling on daily maximum surface temperatures in Southeastern South America. Climate Dynamics, 2020, 55, pp.2543-2556. ⟨10.1007/s00382-020-05399-9⟩. ⟨insu-03726976⟩
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