Dehydration and low ozone in the tropopause layer over the Asian monsoon caused by tropical cyclones: Lagrangian transport calculations using ERA-Interim and ERA5 reanalysis data

Li, Dan; Vogel, Bärbel; Müller, Rolf; Bian, Jianchun; Günther, Gebhard; Ploeger, Felix; Li, Qian; Zhang, Jinqiang; Bai, Zhixuan; Vömel, Holger; Riese, Martin

doi:https://doi.org/10.5194/acp-20-4133-2020

Articles | Volume 20, issue 7

https://doi.org/10.5194/acp-20-4133-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue:

StratoClim stratospheric and upper tropospheric processes...

https://doi.org/10.5194/acp-20-4133-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 20, issue 7

Research article

|

07 Apr 2020

Research article |

| 07 Apr 2020

Dehydration and low ozone in the tropopause layer over the Asian monsoon caused by tropical cyclones: Lagrangian transport calculations using ERA-Interim and ERA5 reanalysis data

Dan Li, Bärbel Vogel, Rolf Müller, Jianchun Bian, Gebhard Günther, Felix Ploeger, Qian Li, Jinqiang Zhang, Zhixuan Bai, Holger Vömel, and Martin Riese

Data sets

ERA-Interim and ERA5 meteorological reanalysis data ECMWF http://apps.ecmwf.int/datasets/

FY-2D and FY-2G data NSMC http://satellite.nsmc.org.cn/PortalSite/Data/Satellite.aspx

Ozone profiles WOUDC https://woudc.org/data/explore.php?lang=en

Upper air soundings data University of Wyoming http://weather.uwyo.edu/upperair/sounding.html

Short summary

Low ozone and low water vapour signatures in the UTLS were investigated using balloon-borne measurements and trajectory calculations. The results show that deep convection in tropical cyclones over the western Pacific transports boundary air parcels with low ozone into the tropopause region. Subsequently, these air parcels are dehydrated when passing the lowest temperature region (< 190 K) during quasi-horizontal advection.