Climate Base State Influences on South Asian Monsoon Processes Derived From Analyses of E3SMv2 and CESM2
Abstract The effects of differences in climate base state are related to processes associated with the present‐day South Asian monsoon simulations in the Energy Exascale Earth System Model version 2 (E3SMv2) and the Community Earth System Model version 2 (CESM2). Though tropical Pacific and Indian O...
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| Format: | Article |
| Language: | English |
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Wiley
2023-09-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2023GL104313 |
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| author | Gerald A. Meehl Christine A. Shields Julie M. Arblaster Richard Neale Aixue Hu H. Annamalai Jean‐Christophe Golaz John Fasullo Nan Rosenbloom Luke VanRoekel Antonietta Capotondi |
| author_facet | Gerald A. Meehl Christine A. Shields Julie M. Arblaster Richard Neale Aixue Hu H. Annamalai Jean‐Christophe Golaz John Fasullo Nan Rosenbloom Luke VanRoekel Antonietta Capotondi |
| author_sort | Gerald A. Meehl |
| collection | DOAJ |
| description | Abstract The effects of differences in climate base state are related to processes associated with the present‐day South Asian monsoon simulations in the Energy Exascale Earth System Model version 2 (E3SMv2) and the Community Earth System Model version 2 (CESM2). Though tropical Pacific and Indian Ocean base state sea surface temperatures (SSTs) are over 1°C cooler in E3SMv2 compared to CESM2, and there is an overall reduction of Indian sector precipitation, the pattern of South Asian monsoon precipitation is similar in the two models. Monsoon‐ENSO teleconnections, dynamically linked by the large‐scale east‐west atmospheric circulation, are reduced in E3SMv2 compared to CESM2. In E3SMv2, this is related to cooler tropical SSTs and ENSO amplitude that is less than half that in CESM2. Comparison to a tropical Pacific pacemaker experiment shows, to a first order, that the base state SSTs and ENSO amplitude contribute roughly equally to lower amplitude monsoon‐ENSO teleconnections in E3SMv2. |
| format | Article |
| id | doaj-art-a23c89983d0c43d0a4e73508a592033e |
| institution | DOAJ |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2023-09-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-a23c89983d0c43d0a4e73508a592033e2025-08-20T03:06:04ZengWileyGeophysical Research Letters0094-82761944-80072023-09-015017n/an/a10.1029/2023GL104313Climate Base State Influences on South Asian Monsoon Processes Derived From Analyses of E3SMv2 and CESM2Gerald A. Meehl0Christine A. Shields1Julie M. Arblaster2Richard Neale3Aixue Hu4H. Annamalai5Jean‐Christophe Golaz6John Fasullo7Nan Rosenbloom8Luke VanRoekel9Antonietta Capotondi10National Center for Atmospheric Research Boulder CO USANational Center for Atmospheric Research Boulder CO USANational Center for Atmospheric Research Boulder CO USANational Center for Atmospheric Research Boulder CO USANational Center for Atmospheric Research Boulder CO USAIPRC/Department of Oceanography University of Hawaii at Manoa Honolulu HI USALawrence Livermore National Laboratory Livermore CA USANational Center for Atmospheric Research Boulder CO USANational Center for Atmospheric Research Boulder CO USALos Alamos National Laboratory Los Alamos NM USACIRES and NOAA Physical Sciences Laboratory University of Colorado Boulder CO USAAbstract The effects of differences in climate base state are related to processes associated with the present‐day South Asian monsoon simulations in the Energy Exascale Earth System Model version 2 (E3SMv2) and the Community Earth System Model version 2 (CESM2). Though tropical Pacific and Indian Ocean base state sea surface temperatures (SSTs) are over 1°C cooler in E3SMv2 compared to CESM2, and there is an overall reduction of Indian sector precipitation, the pattern of South Asian monsoon precipitation is similar in the two models. Monsoon‐ENSO teleconnections, dynamically linked by the large‐scale east‐west atmospheric circulation, are reduced in E3SMv2 compared to CESM2. In E3SMv2, this is related to cooler tropical SSTs and ENSO amplitude that is less than half that in CESM2. Comparison to a tropical Pacific pacemaker experiment shows, to a first order, that the base state SSTs and ENSO amplitude contribute roughly equally to lower amplitude monsoon‐ENSO teleconnections in E3SMv2.https://doi.org/10.1029/2023GL104313E3SMv2CESM2global coupled Earth system modelingIndian monsoonSouth Asian monsoonENSO |
| spellingShingle | Gerald A. Meehl Christine A. Shields Julie M. Arblaster Richard Neale Aixue Hu H. Annamalai Jean‐Christophe Golaz John Fasullo Nan Rosenbloom Luke VanRoekel Antonietta Capotondi Climate Base State Influences on South Asian Monsoon Processes Derived From Analyses of E3SMv2 and CESM2 Geophysical Research Letters E3SMv2 CESM2 global coupled Earth system modeling Indian monsoon South Asian monsoon ENSO |
| title | Climate Base State Influences on South Asian Monsoon Processes Derived From Analyses of E3SMv2 and CESM2 |
| title_full | Climate Base State Influences on South Asian Monsoon Processes Derived From Analyses of E3SMv2 and CESM2 |
| title_fullStr | Climate Base State Influences on South Asian Monsoon Processes Derived From Analyses of E3SMv2 and CESM2 |
| title_full_unstemmed | Climate Base State Influences on South Asian Monsoon Processes Derived From Analyses of E3SMv2 and CESM2 |
| title_short | Climate Base State Influences on South Asian Monsoon Processes Derived From Analyses of E3SMv2 and CESM2 |
| title_sort | climate base state influences on south asian monsoon processes derived from analyses of e3smv2 and cesm2 |
| topic | E3SMv2 CESM2 global coupled Earth system modeling Indian monsoon South Asian monsoon ENSO |
| url | https://doi.org/10.1029/2023GL104313 |
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