The Roles of Convection Parameterization in the Formation of Double ITCZ Syndrome in the NCAR CESM: I. Atmospheric Processes
Several improvements are utilized in the Zhang-McFarlane (ZM) convection scheme to investigate the roles of convection parameterization in the formation of double intertropical convergence zone (ITCZ) bias in the NCAR CESM1.2.1. It is shown that the prominent double ITCZ biases of precipitation, sea...
Published in: | Journal of Advances in Modeling Earth Systems |
---|---|
Main Authors: | , |
Language: | unknown |
Published: |
2021
|
Subjects: | |
Online Access: | http://www.osti.gov/servlets/purl/1511465 https://www.osti.gov/biblio/1511465 https://doi.org/10.1002/2017ms001191 |
id |
ftosti:oai:osti.gov:1511465 |
---|---|
record_format |
openpolar |
spelling |
ftosti:oai:osti.gov:1511465 2023-07-30T04:07:03+02:00 The Roles of Convection Parameterization in the Formation of Double ITCZ Syndrome in the NCAR CESM: I. Atmospheric Processes Song, Xiaoliang Zhang, Guang J. 2021-08-31 application/pdf http://www.osti.gov/servlets/purl/1511465 https://www.osti.gov/biblio/1511465 https://doi.org/10.1002/2017ms001191 unknown http://www.osti.gov/servlets/purl/1511465 https://www.osti.gov/biblio/1511465 https://doi.org/10.1002/2017ms001191 doi:10.1002/2017ms001191 54 ENVIRONMENTAL SCIENCES 2021 ftosti https://doi.org/10.1002/2017ms001191 2023-07-11T09:33:11Z Several improvements are utilized in the Zhang-McFarlane (ZM) convection scheme to investigate the roles of convection parameterization in the formation of double intertropical convergence zone (ITCZ) bias in the NCAR CESM1.2.1. It is shown that the prominent double ITCZ biases of precipitation, sea surface temperature (SST), and wind stress in the standard CESM1.2.1 are largely eliminated in all sea-sons with the use of these improvements in convection scheme. This study for the first time demonstrates that the modifications of convection scheme can eliminate the double ITCZ biases in all seasons, including boreal winter and spring. Further analysis shows that the elimination of the double ITCZ bias is achieved not by improving other possible contributors, such as stratus cloud bias off the west coast of South America and cloud/radiation biases over the Southern Ocean, but by modifying the convection scheme itself. This study demonstrates that convection scheme is the primary contributor to the double ITCZ bias in the CESM1.2.1, and provides a possible solution to the long-standing double ITCZ problem. The atmospheric model simulations forced by observed SST show that the original ZM convection scheme tends to produce double ITCZ bias in high SST scenario, while the modified convection scheme does not. The effect of changes in each core component of convection scheme on the double ITCZ bias in atmospheric model is identified and further investigated. Other/Unknown Material Southern Ocean SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Southern Ocean Journal of Advances in Modeling Earth Systems 10 3 842 866 |
institution |
Open Polar |
collection |
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
54 ENVIRONMENTAL SCIENCES |
spellingShingle |
54 ENVIRONMENTAL SCIENCES Song, Xiaoliang Zhang, Guang J. The Roles of Convection Parameterization in the Formation of Double ITCZ Syndrome in the NCAR CESM: I. Atmospheric Processes |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
description |
Several improvements are utilized in the Zhang-McFarlane (ZM) convection scheme to investigate the roles of convection parameterization in the formation of double intertropical convergence zone (ITCZ) bias in the NCAR CESM1.2.1. It is shown that the prominent double ITCZ biases of precipitation, sea surface temperature (SST), and wind stress in the standard CESM1.2.1 are largely eliminated in all sea-sons with the use of these improvements in convection scheme. This study for the first time demonstrates that the modifications of convection scheme can eliminate the double ITCZ biases in all seasons, including boreal winter and spring. Further analysis shows that the elimination of the double ITCZ bias is achieved not by improving other possible contributors, such as stratus cloud bias off the west coast of South America and cloud/radiation biases over the Southern Ocean, but by modifying the convection scheme itself. This study demonstrates that convection scheme is the primary contributor to the double ITCZ bias in the CESM1.2.1, and provides a possible solution to the long-standing double ITCZ problem. The atmospheric model simulations forced by observed SST show that the original ZM convection scheme tends to produce double ITCZ bias in high SST scenario, while the modified convection scheme does not. The effect of changes in each core component of convection scheme on the double ITCZ bias in atmospheric model is identified and further investigated. |
author |
Song, Xiaoliang Zhang, Guang J. |
author_facet |
Song, Xiaoliang Zhang, Guang J. |
author_sort |
Song, Xiaoliang |
title |
The Roles of Convection Parameterization in the Formation of Double ITCZ Syndrome in the NCAR CESM: I. Atmospheric Processes |
title_short |
The Roles of Convection Parameterization in the Formation of Double ITCZ Syndrome in the NCAR CESM: I. Atmospheric Processes |
title_full |
The Roles of Convection Parameterization in the Formation of Double ITCZ Syndrome in the NCAR CESM: I. Atmospheric Processes |
title_fullStr |
The Roles of Convection Parameterization in the Formation of Double ITCZ Syndrome in the NCAR CESM: I. Atmospheric Processes |
title_full_unstemmed |
The Roles of Convection Parameterization in the Formation of Double ITCZ Syndrome in the NCAR CESM: I. Atmospheric Processes |
title_sort |
roles of convection parameterization in the formation of double itcz syndrome in the ncar cesm: i. atmospheric processes |
publishDate |
2021 |
url |
http://www.osti.gov/servlets/purl/1511465 https://www.osti.gov/biblio/1511465 https://doi.org/10.1002/2017ms001191 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
http://www.osti.gov/servlets/purl/1511465 https://www.osti.gov/biblio/1511465 https://doi.org/10.1002/2017ms001191 doi:10.1002/2017ms001191 |
op_doi |
https://doi.org/10.1002/2017ms001191 |
container_title |
Journal of Advances in Modeling Earth Systems |
container_volume |
10 |
container_issue |
3 |
container_start_page |
842 |
op_container_end_page |
866 |
_version_ |
1772820137753182208 |