Articles | Volume 21, issue 12
https://doi.org/10.5194/acp-21-9585-2021
https://doi.org/10.5194/acp-21-9585-2021
Research article
 | 
28 Jun 2021
Research article |  | 28 Jun 2021

Processes influencing lower stratospheric water vapour in monsoon anticyclones: insights from Lagrangian modelling

Nuria Pilar Plaza, Aurélien Podglajen, Cristina Peña-Ortiz, and Felix Ploeger

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Short summary
We study the role of different processes in setting the lower stratospheric water vapour. We find that mechanisms involving ice microphysics and small-scale mixing produce the strongest increase in water vapour, in particular over the Asian Monsoon. Small-scale mixing has a special relevance as it improves the agreement with observations at seasonal and intra-seasonal timescales, contrary to the North American Monsoon case, in which large-scale temperatures still dominate its variability.
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