Delayed onset of the tropical Asian summer monsoon in CMIP6 can be linked to the cold bias over the Tibetan Plateau
Most global circulation models (GCMs) from the Coupled Model Intercomparison Project Phase 6 (CMIP6) simulate a delayed onset of the tropical Asian summer monsoon of 3–6 pentads when compared with the observations. However, a clear explanation of this model bias has yet to be developed. This study i...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | Environmental Research Letters |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1748-9326/acff79 |
| _version_ | 1797661253806587904 |
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| author | Die Hu Anmin Duan Yuheng Tang Wei Yu |
| author_facet | Die Hu Anmin Duan Yuheng Tang Wei Yu |
| author_sort | Die Hu |
| collection | DOAJ |
| description | Most global circulation models (GCMs) from the Coupled Model Intercomparison Project Phase 6 (CMIP6) simulate a delayed onset of the tropical Asian summer monsoon of 3–6 pentads when compared with the observations. However, a clear explanation of this model bias has yet to be developed. This study indicates that 23 of the 31 of CMIP6 models generate both the Tibetan Plateau (TP) cold bias and the delayed monsoon onset across tropical Asia. The aloft TP cold air temperature associated with these models tends to reduce the land–sea thermal contrast and monsoon circulation, and hence it generates a delayed onset for the tropical summer monsoon. Two sensitivity experiments based on a coupled ocean–atmosphere–land GCM, together with additional data analysis, further confirm the underlying connection between monsoon onset and temperature anomaly over the TP. Therefore, it is of great importance that we attempt to reduce the model bias associated with the simulation of monsoon onset by improving the physical process parameterization scheme related to the TP temperatures. |
| first_indexed | 2024-03-11T18:42:44Z |
| format | Article |
| id | doaj.art-6c0c083431404fda83e2ac958c9dd803 |
| institution | Directory Open Access Journal |
| issn | 1748-9326 |
| language | English |
| last_indexed | 2024-03-11T18:42:44Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Environmental Research Letters |
| spelling | doaj.art-6c0c083431404fda83e2ac958c9dd8032023-10-12T10:26:41ZengIOP PublishingEnvironmental Research Letters1748-93262023-01-01181111400510.1088/1748-9326/acff79Delayed onset of the tropical Asian summer monsoon in CMIP6 can be linked to the cold bias over the Tibetan PlateauDie Hu0https://orcid.org/0000-0003-0482-7585Anmin Duan1https://orcid.org/0000-0002-3022-2582Yuheng Tang2https://orcid.org/0000-0002-9639-3958Wei Yu3State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences , Beijing, People’s Republic of China; College of Earth Science, University of Chinese Academy of Sciences , Beijing, People’s Republic of ChinaState Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences , Beijing, People’s Republic of China; College of Earth Science, University of Chinese Academy of Sciences , Beijing, People’s Republic of China; Center for Marine Meteorology and Climate Change, State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University , Xiamen, People’s Republic of ChinaState Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences , Beijing, People’s Republic of China; College of Earth Science, University of Chinese Academy of Sciences , Beijing, People’s Republic of ChinaSouthern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Atmospheric Sciences, Sun Yat-sen University , Zhuhai, People’s Republic of ChinaMost global circulation models (GCMs) from the Coupled Model Intercomparison Project Phase 6 (CMIP6) simulate a delayed onset of the tropical Asian summer monsoon of 3–6 pentads when compared with the observations. However, a clear explanation of this model bias has yet to be developed. This study indicates that 23 of the 31 of CMIP6 models generate both the Tibetan Plateau (TP) cold bias and the delayed monsoon onset across tropical Asia. The aloft TP cold air temperature associated with these models tends to reduce the land–sea thermal contrast and monsoon circulation, and hence it generates a delayed onset for the tropical summer monsoon. Two sensitivity experiments based on a coupled ocean–atmosphere–land GCM, together with additional data analysis, further confirm the underlying connection between monsoon onset and temperature anomaly over the TP. Therefore, it is of great importance that we attempt to reduce the model bias associated with the simulation of monsoon onset by improving the physical process parameterization scheme related to the TP temperatures.https://doi.org/10.1088/1748-9326/acff79CMIP6Asian summer monsoon onsetTibetan Plateaucold bias |
| spellingShingle | Die Hu Anmin Duan Yuheng Tang Wei Yu Delayed onset of the tropical Asian summer monsoon in CMIP6 can be linked to the cold bias over the Tibetan Plateau Environmental Research Letters CMIP6 Asian summer monsoon onset Tibetan Plateau cold bias |
| title | Delayed onset of the tropical Asian summer monsoon in CMIP6 can be linked to the cold bias over the Tibetan Plateau |
| title_full | Delayed onset of the tropical Asian summer monsoon in CMIP6 can be linked to the cold bias over the Tibetan Plateau |
| title_fullStr | Delayed onset of the tropical Asian summer monsoon in CMIP6 can be linked to the cold bias over the Tibetan Plateau |
| title_full_unstemmed | Delayed onset of the tropical Asian summer monsoon in CMIP6 can be linked to the cold bias over the Tibetan Plateau |
| title_short | Delayed onset of the tropical Asian summer monsoon in CMIP6 can be linked to the cold bias over the Tibetan Plateau |
| title_sort | delayed onset of the tropical asian summer monsoon in cmip6 can be linked to the cold bias over the tibetan plateau |
| topic | CMIP6 Asian summer monsoon onset Tibetan Plateau cold bias |
| url | https://doi.org/10.1088/1748-9326/acff79 |
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