Title: Climate Base State Influences on South Asian Monsoon Processes Derived From Analyses of E3SMv2 and CESM2

Journal Article · · Geophysical Research Letters
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [1];  [3]; ORCiD logo [4]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [5]; ORCiD logo [6]
  1. National Center for Atmospheric Research Boulder CO USA
  2. National Center for Atmospheric Research Boulder CO USA, ARC Centre of Excellence for Climate Extremes Monash University Melbourne VIC Australia
  3. IPRC/Department of Oceanography University of Hawaii at Manoa Honolulu HI USA
  4. Lawrence Livermore National Laboratory Livermore CA USA
  5. Los Alamos National Laboratory Los Alamos NM USA
  6. CIRES and NOAA Physical Sciences Laboratory University of Colorado Boulder CO USA
+ Show Author Affiliations

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.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); University Corporation for Atmospheric Research (UCAR), Boulder, CO (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-05CH11231; AC52-07NA27344; SC0022070; SC0023228
OSTI ID:
1999694
Report Number(s):
LLNL-JRNL-835099; e2023GL104313
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 17 Vol. 50; ISSN 0094-8276
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English

References (32)

Recent and future changes in the Asian monsoon-ENSO relationship: Natural or forced? journal May 2015
Subseasonal variations in spatial signatures of ENSO on the Indian summer monsoon from 1901 to 2009 journal August 2015
Future changes in regional precipitation simulated by a half-degree coupled climate model: Sensitivity to horizontal resolution: PRECIPITATION IN HALF-DEGREE CCSM4 journal June 2016
A climate model projection weighting scheme accounting for performance and interdependence: Model Projection Weighting Scheme journal January 2017
The relative contributions of tropical Pacific sea surface temperatures and atmospheric internal variability to the recent global warming hiatus: Recent Global Warming Hiatus journal August 2017
Impact of Lateral Mixing in the Ocean on El Nino in a Suite of Fully Coupled Climate Models: LATERAL MIXING AND EL NINO journal November 2017
The Role of Convective Gustiness in Reducing Seasonal Precipitation Biases in the Tropical West Pacific journal April 2018
The ERA5 global reanalysis journal June 2020
An Evaluation of the Ocean and Sea Ice Climate of E3SM Using MPAS and Interannual CORE‐II Forcing journal May 2019
Climate Change Projections for the Australian Monsoon From CMIP6 Models journal June 2020
Improved Diurnal Cycle of Precipitation in E3SM With a Revised Convective Triggering Function journal July 2019
An Energy Consistent Discretization of the Nonhydrostatic Equations in Primitive Variables journal January 2020
The Community Earth System Model Version 2 (CESM2) journal February 2020
Intraseasonal, Seasonal, and Interannual Characteristics of Regional Monsoon Simulations in CESM2 journal June 2020
ENSO and Pacific Decadal Variability in the Community Earth System Model Version 2 journal December 2020
Projected ENSO Teleconnection Changes in CMIP6 journal May 2022
The DOE E3SM Model Version 2: Overview of the Physical Model and Initial Model Evaluation journal December 2022
Recent global-warming hiatus tied to equatorial Pacific surface cooling journal August 2013
Robust twenty-first-century projections of El Niño and related precipitation variability journal October 2013
Sensitivity of climate simulations to the parameterization of cumulus convection in the Canadian climate centre general circulation model journal September 1995
A Single Forecast Comparison Between the NCAR and GFDL General Circulation Models journal September 1976
The Impact of Convection on ENSO: From a Delayed Oscillator to a Series of Events journal November 2008
Monsoon Regimes and Processes in CCSM4. Part I: The Asian–Australian Monsoon journal April 2012
Monsoon Regimes and Processes in CCSM4. Part II: African and American Monsoon Systems journal April 2012
Global Warming Shifts the Monsoon Circulation, Drying South Asia journal May 2013
Advanced Two-Moment Bulk Microphysics for Global Models. Part I: Off-Line Tests and Comparison with Other Schemes journal February 2015
Relative Contributions of Mean-State Shifts and ENSO-Driven Variability to Precipitation Changes in a Warming Climate journal December 2015
The role of the basic state in the ENSO–monsoon relationship and implications for predictability journal April 2005
Effective radiative forcing and adjustments in CMIP6 models journal January 2020
Robust increase of Indian monsoon rainfall and its variability under future warming in CMIP6 models journal April 2021
Better calibration of cloud parameterizations and subgrid effects increases the fidelity of the E3SM Atmosphere Model version 1 journal January 2022
Description and evaluation of a new four-mode version of the Modal Aerosol Module (MAM4) within version 5.3 of the Community Atmosphere Model journal January 2016

Similar Records

Related Subjects

54 ENVIRONMENTAL SCIENCES
CESM2
E3SMv2
ENSO
Indian monsoon
South Asian monsoon
global coupled Earth system modeling