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Title: Intraseasonal, Seasonal, and Interannual Characteristics of Regional Monsoon Simulations in CESM2

Abstract

A survey of intraseasonal, seasonal, and interannual precipitation and 850 hPa winds for various monsoon regimes around the world is presented for the Community Earth System Model Version 2 (CESM2) compared to observations and the previous generation CESM1. In CESM2 the south Asian monsoon has a reduction of excessive precipitation in the western Indian Ocean and an increase of precipitation in the eastern Bay of Bengal and land areas of Vietnam, Cambodia, and Laos. The seasonal timing of the south Asian monsoon, monsoon–ENSO connections, and monsoon intraseasonal variability all are improved compared to CESM1. For the Australian monsoon, deficient precipitation over the Maritime Continent has been improved in CESM2 with increases of precipitation over the large tropical islands of Borneo, Celebes, and Papua New Guinea and decreases over southwestern Australia. In the West African monsoon, May–June seasonal rainfall occurs more preferentially over the African coast in CESM2 as in observations, and excessive rainfall over the Ethiopian region is reduced. During July–September in the West African monsoon, deficient precipitation over equatorial Africa in CESM1 has been lessened in CESM2, and there are increases in precipitation over the Guinean coast, though there is little overall improvement in the South African monsoon. Inmore » the South American monsoon, precipitation in CESM2 is improved with increased precipitation over the Amazon in central and western Brazil. Here, CESM2 simulates a reduction of excessive precipitation seen in CESM1 over coastal Mexico extending up into the U.S. Great Plains in the North American monsoon.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [1]
  1. National Center for Atmospheric Research Boulder CO USA
  2. National Center for Atmospheric Research Boulder CO USA, ARC Centre of Excellence for Climate ExtremesMonash University Melbourne Victoria Australia
  3. IPRC/Department of OceanographyUniversity of Hawaii at Manoa Honolulu HI USA
Publication Date:
Research Org.:
University Corporation for Atmospheric Research, Boulder, CO (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER); National Science Foundation (NSF)
OSTI Identifier:
1633330
Alternate Identifier(s):
OSTI ID: 1670782
Grant/Contract Number:  
89243018SSC000007; 1852977; 1460742
Resource Type:
Published Article
Journal Name:
Journal of Advances in Modeling Earth Systems
Additional Journal Information:
Journal Name: Journal of Advances in Modeling Earth Systems Journal Volume: 12 Journal Issue: 6; Journal ID: ISSN 1942-2466
Publisher:
American Geophysical Union (AGU)
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; global coupled Earth system modeling; Asian‐Australian monsoon; west African monsoon; north American monsoon; south American monsoon

Citation Formats

Meehl, Gerald A., Shields, Christine, Arblaster, Julie M., Annamalai, H., and Neale, Rich. Intraseasonal, Seasonal, and Interannual Characteristics of Regional Monsoon Simulations in CESM2. United States: N. p., 2020. Web. doi:10.1029/2019MS001962.
Meehl, Gerald A., Shields, Christine, Arblaster, Julie M., Annamalai, H., & Neale, Rich. Intraseasonal, Seasonal, and Interannual Characteristics of Regional Monsoon Simulations in CESM2. United States. doi:https://doi.org/10.1029/2019MS001962
Meehl, Gerald A., Shields, Christine, Arblaster, Julie M., Annamalai, H., and Neale, Rich. Fri . "Intraseasonal, Seasonal, and Interannual Characteristics of Regional Monsoon Simulations in CESM2". United States. doi:https://doi.org/10.1029/2019MS001962.
@article{osti_1633330,
title = {Intraseasonal, Seasonal, and Interannual Characteristics of Regional Monsoon Simulations in CESM2},
author = {Meehl, Gerald A. and Shields, Christine and Arblaster, Julie M. and Annamalai, H. and Neale, Rich},
abstractNote = {A survey of intraseasonal, seasonal, and interannual precipitation and 850 hPa winds for various monsoon regimes around the world is presented for the Community Earth System Model Version 2 (CESM2) compared to observations and the previous generation CESM1. In CESM2 the south Asian monsoon has a reduction of excessive precipitation in the western Indian Ocean and an increase of precipitation in the eastern Bay of Bengal and land areas of Vietnam, Cambodia, and Laos. The seasonal timing of the south Asian monsoon, monsoon–ENSO connections, and monsoon intraseasonal variability all are improved compared to CESM1. For the Australian monsoon, deficient precipitation over the Maritime Continent has been improved in CESM2 with increases of precipitation over the large tropical islands of Borneo, Celebes, and Papua New Guinea and decreases over southwestern Australia. In the West African monsoon, May–June seasonal rainfall occurs more preferentially over the African coast in CESM2 as in observations, and excessive rainfall over the Ethiopian region is reduced. During July–September in the West African monsoon, deficient precipitation over equatorial Africa in CESM1 has been lessened in CESM2, and there are increases in precipitation over the Guinean coast, though there is little overall improvement in the South African monsoon. In the South American monsoon, precipitation in CESM2 is improved with increased precipitation over the Amazon in central and western Brazil. Here, CESM2 simulates a reduction of excessive precipitation seen in CESM1 over coastal Mexico extending up into the U.S. Great Plains in the North American monsoon.},
doi = {10.1029/2019MS001962},
journal = {Journal of Advances in Modeling Earth Systems},
number = 6,
volume = 12,
place = {United States},
year = {2020},
month = {6}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: https://doi.org/10.1029/2019MS001962

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Cited by: 1 work
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Figures / Tables:

Figure 1 Figure 1: South Asian monsoon precipitation (mm day-1) and 850-hPa wind vectors (m s-1) for JJAS; scaling arrow at upper right (a) CESM2, (b) CESM1, and (c) observations (TRMM/ERA-I); d) precipitation differences, CESM2 minus CESM1; e) same as (d) except for CESM2 minus observations; f) same as (e) except formore » CESM1 minus observations; g) monthly latitudinal evolution of monsoon precipitation averaged from 70°E - 100°E for TRMM observations; h) same as (g) except for GPCP observations; i) same as (g) except for CESM2, 1979-2005; j) same as (g) except for CESM1. An average of 11 ensemble members is shown for the models, model years 1986-2005 chosen to match CESM1 published data. ERA-I data spans 1986-2010, TRMM data 1998-2013, and GPCP from 1979-2017. Stippling in (d)-(f) represents statistically significant differences at the 99% level. Wind data from the model was interpolated to 850 hPa and therefore masked out over the Himalayas.« less

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