2019
DOI: 10.5194/acp-2019-1075
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Confinement of air in the Asian monsoon anticyclone and pathways of convective air to the stratosphere during summer season

Abstract: <p><strong>Abstract.</strong> We study the transport pathways from the top of convective clouds to the lower <p>tropical stratosphere during the Asian monsoon, using massive Lagrangian trajectories driven by observed clouds and the two reanalysis ERA-Interim and ERA5 with diabatic and kinematic vertical motions. We find that the upward propagation of convective impact is very similar for the kinematic and diabatic calculations using ERA5 while the two cas… Show more

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Cited by 13 publications
(28 citation statements)
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References 25 publications
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“…A contribution of ASM anticyclone air at even higher potential temperature levels cannot be ruled out based on our observations. The significant isolation of the ASM anticyclone air up to 400 K and the rapid weakening of this isolation in the range between 400 and 435 K shown by our observations is roughly consistent with recent analyses of ASM confinement using trajectory analyses (Brunamonti et al, 2018;Legras and Bucci, 2020).…”
Section: Mixing With the Stratospheresupporting
confidence: 93%
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“…A contribution of ASM anticyclone air at even higher potential temperature levels cannot be ruled out based on our observations. The significant isolation of the ASM anticyclone air up to 400 K and the rapid weakening of this isolation in the range between 400 and 435 K shown by our observations is roughly consistent with recent analyses of ASM confinement using trajectory analyses (Brunamonti et al, 2018;Legras and Bucci, 2020).…”
Section: Mixing With the Stratospheresupporting
confidence: 93%
“…This diabatic "chimney" results from frequent deep convective activity up to around 370 K, although single convective events may reach higher. Legras and Bucci (2020), show high clouds in 2017 to be mostly distributed between 340 and 370 K, with some rare convective events reaching up to 400 K This is very similar to the cloud top height distribution over the ASM region that was shown for 2007 by Ueyama et al (2018).…”
Section: Transition To Slow Upwellingsupporting
confidence: 75%
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“…In an analysis of the ATLAS trajectories, the influence of the usage of ERA5 or ERA-Interim as meteorological fields, the influence of applied vertical diffusion, and the influence of the usage of kinematic or diabatic trajectories was investigated (not shown). This analysis (and also similar analyses by Legras and Bucci (2019) (Levelt et al, 2006). In this work, we use the troposheric column of nitrogen dioxide (NO 2 ) as a proxy for pollutant emissions (Crutzen, 1979).…”
Section: Atlasmentioning
confidence: 71%
“…We use here the cloud top products provided by the SAF-NWC (EUMETSAT Satellite Application Facility for Nowcasting) software package (Derrien et al, 2010;Sèze et al, 2015) from MSG1 (Meteosat 8) and Himawari geostationary satellites. More details on the algorithm and its evaluation against trace gas measurements can be found in Bucci et al (2020) and Legras and Bucci (2019).…”
Section: Traczillamentioning
confidence: 99%