Role of the Convection Scheme in Modeling Initiation and Intensification of Tropical Depressions over the North Atlantic
The authors analyze how modifications of the convective scheme modify the initiation of tropical depression vortices (TDVs) and their intensification into stronger warm-cored tropical cyclone–like vortices (TCs) in global climate model (GCM) simulations. The model’s original convection scheme has en...
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ftdatacite:10.7916/d8-nwc5-mj09 2023-05-15T17:35:10+02:00 Role of the Convection Scheme in Modeling Initiation and Intensification of Tropical Depressions over the North Atlantic Duvel, Jean-Philippe Camargo, Suzana J. Sobel, Adam H. 2017 https://dx.doi.org/10.7916/d8-nwc5-mj09 https://academiccommons.columbia.edu/doi/10.7916/d8-nwc5-mj09 unknown Columbia University https://dx.doi.org/10.1175/mwr-d-16-0201.1 Mathematical models--Evaluation Hurricanes Convection Meteorology Atmospheric circulation--Models Cyclones Text Articles article-journal ScholarlyArticle 2017 ftdatacite https://doi.org/10.7916/d8-nwc5-mj09 https://doi.org/10.1175/mwr-d-16-0201.1 2021-11-05T12:55:41Z The authors analyze how modifications of the convective scheme modify the initiation of tropical depression vortices (TDVs) and their intensification into stronger warm-cored tropical cyclone–like vortices (TCs) in global climate model (GCM) simulations. The model’s original convection scheme has entrainment and cloud-base mass flux closures based on moisture convergence. Two modifications are considered: one in which entrainment is dependent on relative humidity and another in which the closure is based on the convective available potential energy (CAPE). Compared to reanalysis, TDVs are more numerous and intense in all three simulations, probably as a result of excessive parameterized deep convection at the expense of convection detraining at midlevel. The relative humidity–dependent entrainment rate increases both TDV initiation and intensification relative to the control. This is because this entrainment rate is reduced in the moist center of the TDVs, giving more intense convective precipitation, and also because it generates a moister environment that may favor the development of early stage TDVs. The CAPE closure inhibits the parameterized convection in strong TDVs, thus limiting their development despite a slight increase in the resolved convection. However, the maximum intensity reached by TC-like TDVs is similar in the three simulations, showing the statistical character of these tendencies. The simulated TCs develop from TDVs with different dynamical origins than those observed. For instance, too many TDVs and TCs initiate near or over southern West Africa in the GCM, collocated with the maximum in easterly wave activity, whose characteristics are also dependent on the convection scheme considered. Text North Atlantic DataCite Metadata Store (German National Library of Science and Technology) |
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topic |
Mathematical models--Evaluation Hurricanes Convection Meteorology Atmospheric circulation--Models Cyclones |
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Mathematical models--Evaluation Hurricanes Convection Meteorology Atmospheric circulation--Models Cyclones Duvel, Jean-Philippe Camargo, Suzana J. Sobel, Adam H. Role of the Convection Scheme in Modeling Initiation and Intensification of Tropical Depressions over the North Atlantic |
topic_facet |
Mathematical models--Evaluation Hurricanes Convection Meteorology Atmospheric circulation--Models Cyclones |
description |
The authors analyze how modifications of the convective scheme modify the initiation of tropical depression vortices (TDVs) and their intensification into stronger warm-cored tropical cyclone–like vortices (TCs) in global climate model (GCM) simulations. The model’s original convection scheme has entrainment and cloud-base mass flux closures based on moisture convergence. Two modifications are considered: one in which entrainment is dependent on relative humidity and another in which the closure is based on the convective available potential energy (CAPE). Compared to reanalysis, TDVs are more numerous and intense in all three simulations, probably as a result of excessive parameterized deep convection at the expense of convection detraining at midlevel. The relative humidity–dependent entrainment rate increases both TDV initiation and intensification relative to the control. This is because this entrainment rate is reduced in the moist center of the TDVs, giving more intense convective precipitation, and also because it generates a moister environment that may favor the development of early stage TDVs. The CAPE closure inhibits the parameterized convection in strong TDVs, thus limiting their development despite a slight increase in the resolved convection. However, the maximum intensity reached by TC-like TDVs is similar in the three simulations, showing the statistical character of these tendencies. The simulated TCs develop from TDVs with different dynamical origins than those observed. For instance, too many TDVs and TCs initiate near or over southern West Africa in the GCM, collocated with the maximum in easterly wave activity, whose characteristics are also dependent on the convection scheme considered. |
format |
Text |
author |
Duvel, Jean-Philippe Camargo, Suzana J. Sobel, Adam H. |
author_facet |
Duvel, Jean-Philippe Camargo, Suzana J. Sobel, Adam H. |
author_sort |
Duvel, Jean-Philippe |
title |
Role of the Convection Scheme in Modeling Initiation and Intensification of Tropical Depressions over the North Atlantic |
title_short |
Role of the Convection Scheme in Modeling Initiation and Intensification of Tropical Depressions over the North Atlantic |
title_full |
Role of the Convection Scheme in Modeling Initiation and Intensification of Tropical Depressions over the North Atlantic |
title_fullStr |
Role of the Convection Scheme in Modeling Initiation and Intensification of Tropical Depressions over the North Atlantic |
title_full_unstemmed |
Role of the Convection Scheme in Modeling Initiation and Intensification of Tropical Depressions over the North Atlantic |
title_sort |
role of the convection scheme in modeling initiation and intensification of tropical depressions over the north atlantic |
publisher |
Columbia University |
publishDate |
2017 |
url |
https://dx.doi.org/10.7916/d8-nwc5-mj09 https://academiccommons.columbia.edu/doi/10.7916/d8-nwc5-mj09 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://dx.doi.org/10.1175/mwr-d-16-0201.1 |
op_doi |
https://doi.org/10.7916/d8-nwc5-mj09 https://doi.org/10.1175/mwr-d-16-0201.1 |
_version_ |
1766134236778070016 |