Long‐range transport of Saharan dust and its radiative impact on precipitation forecast: a case study during the Convective and Orographically‐induced Precipitation Study (COPS)
Abstract A Saharan dust event affected the Rhine valley in southwestern Germany and eastern France on 1 August 2007 during the Convective and Orographically‐induced Precipitation Study (COPS) experiment. Prior to an episode of intense convection, a layer of dry, clean air capped by a moist, dusty la...
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crwiley:10.1002/qj.719 2024-09-15T18:24:02+00:00 Long‐range transport of Saharan dust and its radiative impact on precipitation forecast: a case study during the Convective and Orographically‐induced Precipitation Study (COPS) Chaboureau, Jean‐Pierre Richard, Evelyne Pinty, Jean‐Pierre Flamant, Cyrille Di Girolamo, Paolo Kiemle, Christoph Behrendt, Andreas Chepfer, Hélène Chiriaco, Marjolaine Wulfmeyer, Volker 2011 http://dx.doi.org/10.1002/qj.719 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fqj.719 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/qj.719 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Quarterly Journal of the Royal Meteorological Society volume 137, issue S1, page 236-251 ISSN 0035-9009 1477-870X journal-article 2011 crwiley https://doi.org/10.1002/qj.719 2024-07-04T04:27:04Z Abstract A Saharan dust event affected the Rhine valley in southwestern Germany and eastern France on 1 August 2007 during the Convective and Orographically‐induced Precipitation Study (COPS) experiment. Prior to an episode of intense convection, a layer of dry, clean air capped by a moist, dusty layer was observed using Cloud‐Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) and airborne and ground‐based lidar observations from North Africa to western Europe. The origin of the different layers was investigated using the regional model Meso‐NH. For the purpose of modelling evaluation, a lidar simulator was developed for direct comparison of observed and simulated vertical structures of the lidar backscattered signal. Overall, the model reproduced the vertical structure of dust probed several times by the different lidar systems during its long‐range transport. From Lagrangian back trajectories it was found that the dust was mobilized from sources in Mauritania six days earlier, while the dry layer subsided over the north Atlantic. Off the Moroccan coasts, the dry layer folded down beneath the dusty air mass and the two‐layer structure was advected to the Rhine valley in about two days. By heating the atmosphere, the dust layer changed the static stability of the atmosphere and thus the occurrence of convection. A study of sensitivity to the radiative effect of dust showed a better prediction of precipitation when a dust prognostic scheme was used rather than climatology or when dust effects were ignored. This result suggests that dust episodes that occur prior to convective events might be important for quantitative precipitation forecasts. Copyright © 2011 Royal Meteorological Society Article in Journal/Newspaper North Atlantic Wiley Online Library Quarterly Journal of the Royal Meteorological Society 137 S1 236 251 |
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Wiley Online Library |
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crwiley |
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English |
description |
Abstract A Saharan dust event affected the Rhine valley in southwestern Germany and eastern France on 1 August 2007 during the Convective and Orographically‐induced Precipitation Study (COPS) experiment. Prior to an episode of intense convection, a layer of dry, clean air capped by a moist, dusty layer was observed using Cloud‐Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) and airborne and ground‐based lidar observations from North Africa to western Europe. The origin of the different layers was investigated using the regional model Meso‐NH. For the purpose of modelling evaluation, a lidar simulator was developed for direct comparison of observed and simulated vertical structures of the lidar backscattered signal. Overall, the model reproduced the vertical structure of dust probed several times by the different lidar systems during its long‐range transport. From Lagrangian back trajectories it was found that the dust was mobilized from sources in Mauritania six days earlier, while the dry layer subsided over the north Atlantic. Off the Moroccan coasts, the dry layer folded down beneath the dusty air mass and the two‐layer structure was advected to the Rhine valley in about two days. By heating the atmosphere, the dust layer changed the static stability of the atmosphere and thus the occurrence of convection. A study of sensitivity to the radiative effect of dust showed a better prediction of precipitation when a dust prognostic scheme was used rather than climatology or when dust effects were ignored. This result suggests that dust episodes that occur prior to convective events might be important for quantitative precipitation forecasts. Copyright © 2011 Royal Meteorological Society |
format |
Article in Journal/Newspaper |
author |
Chaboureau, Jean‐Pierre Richard, Evelyne Pinty, Jean‐Pierre Flamant, Cyrille Di Girolamo, Paolo Kiemle, Christoph Behrendt, Andreas Chepfer, Hélène Chiriaco, Marjolaine Wulfmeyer, Volker |
spellingShingle |
Chaboureau, Jean‐Pierre Richard, Evelyne Pinty, Jean‐Pierre Flamant, Cyrille Di Girolamo, Paolo Kiemle, Christoph Behrendt, Andreas Chepfer, Hélène Chiriaco, Marjolaine Wulfmeyer, Volker Long‐range transport of Saharan dust and its radiative impact on precipitation forecast: a case study during the Convective and Orographically‐induced Precipitation Study (COPS) |
author_facet |
Chaboureau, Jean‐Pierre Richard, Evelyne Pinty, Jean‐Pierre Flamant, Cyrille Di Girolamo, Paolo Kiemle, Christoph Behrendt, Andreas Chepfer, Hélène Chiriaco, Marjolaine Wulfmeyer, Volker |
author_sort |
Chaboureau, Jean‐Pierre |
title |
Long‐range transport of Saharan dust and its radiative impact on precipitation forecast: a case study during the Convective and Orographically‐induced Precipitation Study (COPS) |
title_short |
Long‐range transport of Saharan dust and its radiative impact on precipitation forecast: a case study during the Convective and Orographically‐induced Precipitation Study (COPS) |
title_full |
Long‐range transport of Saharan dust and its radiative impact on precipitation forecast: a case study during the Convective and Orographically‐induced Precipitation Study (COPS) |
title_fullStr |
Long‐range transport of Saharan dust and its radiative impact on precipitation forecast: a case study during the Convective and Orographically‐induced Precipitation Study (COPS) |
title_full_unstemmed |
Long‐range transport of Saharan dust and its radiative impact on precipitation forecast: a case study during the Convective and Orographically‐induced Precipitation Study (COPS) |
title_sort |
long‐range transport of saharan dust and its radiative impact on precipitation forecast: a case study during the convective and orographically‐induced precipitation study (cops) |
publisher |
Wiley |
publishDate |
2011 |
url |
http://dx.doi.org/10.1002/qj.719 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fqj.719 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/qj.719 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Quarterly Journal of the Royal Meteorological Society volume 137, issue S1, page 236-251 ISSN 0035-9009 1477-870X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/qj.719 |
container_title |
Quarterly Journal of the Royal Meteorological Society |
container_volume |
137 |
container_issue |
S1 |
container_start_page |
236 |
op_container_end_page |
251 |
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1810464334515535872 |