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Communication Dans Un Congrès Année : 2019

On the diurnal cycle of atmospheric relative humidity in the intertropical regions

Résumé

The heat engine of climate is the atmospheric water cycle. The relationships between clouds and the atmospheric water vapor are key to improve our understanding of climate variability. Recent advances in space-borne remote sensing provide new opportunities to investigate the clouds-moisture interactions at regional and global scales. We focus on the joint diurnal variations of vertical profiles of tropospheric water vapor and collocated cloud categories in the intertropical region. Water vapor profiles are retrieved from the SAPHIR/Megha-Tropiques microwave sounder and cloud types are obtained from infrared and visible sensors onboard geostationary satellites. Environmental parameters such as SST and air temperature are extracted from the ERA-5 reanalysis. Winter and summer seasons are contrasted over the tropical oceans. The diurnal and seasonal variations of water vapor is analyzed conditionally to five cloud types. The diurnal cycle of water vapor evolves from the bottom to the top of the troposphere and strongly depends on the cloud type, with a modulation according to the season. This analysis is a first step toward a more general endeavor to improve our understanding of the atmospheric water cycle.
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Dates et versions

insu-04427531 , version 1 (30-01-2024)

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P. E. Kirstetter, Hélène Brogniez, Christophe Dufour. On the diurnal cycle of atmospheric relative humidity in the intertropical regions. American Geophysical Union, Fall Meeting 2019, Dec 2019, San Francisco, United States. pp.abstract #A53D-02. ⟨insu-04427531⟩
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