Interaction of microphysics and dynamics in a warm conveyor belt simulated with the ICON model
Warm conveyor belts (WCBs) produce a major fraction of precipitation in extratropical cyclones and modulate the large-scale extratropical circulation. Diabatic processes, in particular associated with cloud formation, influence the cross-isentropic ascent of WCBs into the upper troposphere and addit...
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ftcopernicus:oai:publications.copernicus.org:egusphere109648 2023-08-27T04:10:50+02:00 Interaction of microphysics and dynamics in a warm conveyor belt simulated with the ICON model Oertel, Annika Miltenberger, Annette K. Grams, Christian M. Hoose, Corinna 2023-08-02 application/pdf https://doi.org/10.5194/egusphere-2023-259 https://egusphere.copernicus.org/preprints/2023/egusphere-2023-259/ eng eng doi:10.5194/egusphere-2023-259 https://egusphere.copernicus.org/preprints/2023/egusphere-2023-259/ eISSN: Text 2023 ftcopernicus https://doi.org/10.5194/egusphere-2023-259 2023-08-07T16:24:18Z Warm conveyor belts (WCBs) produce a major fraction of precipitation in extratropical cyclones and modulate the large-scale extratropical circulation. Diabatic processes, in particular associated with cloud formation, influence the cross-isentropic ascent of WCBs into the upper troposphere and additionally modify the potential vorticity (PV) distribution, which influences the larger-scale flow. In this study we investigate heating and PV rates from all diabatic processes, including microphysics, turbulence, convection, and radiation, in a case study that occurred during the North Atlantic Waveguide and Downstream Impact Experiment (NAWDEX) campaign using the Icosahedral Nonhydrostatic (ICON) modeling framework. In particular, we consider all individual microphysical process rates that are implemented in ICON's two-moment microphysics scheme, which sheds light on (i) which microphysical processes dominate the diabatic heating and PV structure in the WCB and (ii) which microphysical processes are the most active during the ascent and influence cloud formation and characteristics, providing a basis for detailed sensitivity experiments. For this purpose, diabatic heating and PV rates are integrated for the first time along online trajectories across nested grids with different horizontal resolutions. The convection-permitting simulation setup also takes the reduced aerosol concentrations over the North Atlantic into account. Our results confirm that microphysical processes are the dominant diabatic heating source during ascent. Near the cloud top longwave radiation cools WCB air parcels. Radiative heating and corresponding PV modification in the upper troposphere are non-negligible due to the longevity of the WCB cloud band. In the WCB ascent region, the process rates from turbulent heating and microphysics partially counteract each other. From all microphysical processes condensational growth of cloud droplets and vapor deposition on frozen hydrometeors most strongly influence diabatic heating and PV, while ... Text North Atlantic Copernicus Publications: E-Journals |
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Open Polar |
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Copernicus Publications: E-Journals |
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English |
description |
Warm conveyor belts (WCBs) produce a major fraction of precipitation in extratropical cyclones and modulate the large-scale extratropical circulation. Diabatic processes, in particular associated with cloud formation, influence the cross-isentropic ascent of WCBs into the upper troposphere and additionally modify the potential vorticity (PV) distribution, which influences the larger-scale flow. In this study we investigate heating and PV rates from all diabatic processes, including microphysics, turbulence, convection, and radiation, in a case study that occurred during the North Atlantic Waveguide and Downstream Impact Experiment (NAWDEX) campaign using the Icosahedral Nonhydrostatic (ICON) modeling framework. In particular, we consider all individual microphysical process rates that are implemented in ICON's two-moment microphysics scheme, which sheds light on (i) which microphysical processes dominate the diabatic heating and PV structure in the WCB and (ii) which microphysical processes are the most active during the ascent and influence cloud formation and characteristics, providing a basis for detailed sensitivity experiments. For this purpose, diabatic heating and PV rates are integrated for the first time along online trajectories across nested grids with different horizontal resolutions. The convection-permitting simulation setup also takes the reduced aerosol concentrations over the North Atlantic into account. Our results confirm that microphysical processes are the dominant diabatic heating source during ascent. Near the cloud top longwave radiation cools WCB air parcels. Radiative heating and corresponding PV modification in the upper troposphere are non-negligible due to the longevity of the WCB cloud band. In the WCB ascent region, the process rates from turbulent heating and microphysics partially counteract each other. From all microphysical processes condensational growth of cloud droplets and vapor deposition on frozen hydrometeors most strongly influence diabatic heating and PV, while ... |
format |
Text |
author |
Oertel, Annika Miltenberger, Annette K. Grams, Christian M. Hoose, Corinna |
spellingShingle |
Oertel, Annika Miltenberger, Annette K. Grams, Christian M. Hoose, Corinna Interaction of microphysics and dynamics in a warm conveyor belt simulated with the ICON model |
author_facet |
Oertel, Annika Miltenberger, Annette K. Grams, Christian M. Hoose, Corinna |
author_sort |
Oertel, Annika |
title |
Interaction of microphysics and dynamics in a warm conveyor belt simulated with the ICON model |
title_short |
Interaction of microphysics and dynamics in a warm conveyor belt simulated with the ICON model |
title_full |
Interaction of microphysics and dynamics in a warm conveyor belt simulated with the ICON model |
title_fullStr |
Interaction of microphysics and dynamics in a warm conveyor belt simulated with the ICON model |
title_full_unstemmed |
Interaction of microphysics and dynamics in a warm conveyor belt simulated with the ICON model |
title_sort |
interaction of microphysics and dynamics in a warm conveyor belt simulated with the icon model |
publishDate |
2023 |
url |
https://doi.org/10.5194/egusphere-2023-259 https://egusphere.copernicus.org/preprints/2023/egusphere-2023-259/ |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
eISSN: |
op_relation |
doi:10.5194/egusphere-2023-259 https://egusphere.copernicus.org/preprints/2023/egusphere-2023-259/ |
op_doi |
https://doi.org/10.5194/egusphere-2023-259 |
_version_ |
1775353161272262656 |