ENSO-Related Precipitation and Its Statistical Relationship with the Walker Circulation Trend in CMIP5 AMIP Models
Abstract
Observational evidence shows that the Walker circulation (WC) in the tropical Pacific has strengthened in recent decades. In this study, we examine the WC trend for 1979–2005 and its relationship with the precipitation associated with the El Niño Southern Oscillation (ENSO) using the sea surface temperature (SST)-constrained Atmospheric Model Intercomparison Project (AMIP) simulations of the Coupled Model Intercomparison Project Phase 5 (CMIP5) climate models. All of the 29 models show a strengthening of the WC trend in response to an increase in the SST zonal gradient along the equator. Despite the same SST-constrained AMIP simulations, however, a large diversity is found among the CMIP5 climate models in the magnitude of the WC trend. The relationship between the WC trend and precipitation anomalies (PRCPAs) associated with ENSO (ENSO-related PRCPAs) shows that the longitudinal position of the ENSO-related PRCPAs in the western tropical Pacific is closely related to the magnitude of the WC trend. Specifically, it is found that the strengthening of the WC trend is large (small) in the CMIP5 AMIP simulations in which the ENSO-related PRCPAs are located relatively westward (eastward) in the western tropical Pacific. Furthermore, the zonal shift of the ENSO-related precipitation in the western tropical Pacific, whichmore »
- Authors:
-
- Hanyang Univ., Ansan (Korea, Republic of)
- Seoul National Univ. (Korea, Republic of)
- Publication Date:
- Research Org.:
- Korea Meteorological Administration Research and Development Program (Korea)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1395870
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Atmosphere (Basel)
- Additional Journal Information:
- Journal Name: Atmosphere (Basel); Journal Volume: 7; Journal Issue: 2; Journal ID: ISSN 2073-4433
- Publisher:
- MDPI
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; walker circulation; ENSO; sea surface temperature; precipitation; CMIP5 climate models
Citation Formats
Yim, Bo, Yeh, Sang -Wook, and Sohn, Byung -Ju. ENSO-Related Precipitation and Its Statistical Relationship with the Walker Circulation Trend in CMIP5 AMIP Models. United States: N. p., 2016.
Web. doi:10.3390/atmos7020019.
Yim, Bo, Yeh, Sang -Wook, & Sohn, Byung -Ju. ENSO-Related Precipitation and Its Statistical Relationship with the Walker Circulation Trend in CMIP5 AMIP Models. United States. https://doi.org/10.3390/atmos7020019
Yim, Bo, Yeh, Sang -Wook, and Sohn, Byung -Ju. Fri .
"ENSO-Related Precipitation and Its Statistical Relationship with the Walker Circulation Trend in CMIP5 AMIP Models". United States. https://doi.org/10.3390/atmos7020019. https://www.osti.gov/servlets/purl/1395870.
@article{osti_1395870,
title = {ENSO-Related Precipitation and Its Statistical Relationship with the Walker Circulation Trend in CMIP5 AMIP Models},
author = {Yim, Bo and Yeh, Sang -Wook and Sohn, Byung -Ju},
abstractNote = {Observational evidence shows that the Walker circulation (WC) in the tropical Pacific has strengthened in recent decades. In this study, we examine the WC trend for 1979–2005 and its relationship with the precipitation associated with the El Niño Southern Oscillation (ENSO) using the sea surface temperature (SST)-constrained Atmospheric Model Intercomparison Project (AMIP) simulations of the Coupled Model Intercomparison Project Phase 5 (CMIP5) climate models. All of the 29 models show a strengthening of the WC trend in response to an increase in the SST zonal gradient along the equator. Despite the same SST-constrained AMIP simulations, however, a large diversity is found among the CMIP5 climate models in the magnitude of the WC trend. The relationship between the WC trend and precipitation anomalies (PRCPAs) associated with ENSO (ENSO-related PRCPAs) shows that the longitudinal position of the ENSO-related PRCPAs in the western tropical Pacific is closely related to the magnitude of the WC trend. Specifically, it is found that the strengthening of the WC trend is large (small) in the CMIP5 AMIP simulations in which the ENSO-related PRCPAs are located relatively westward (eastward) in the western tropical Pacific. Furthermore, the zonal shift of the ENSO-related precipitation in the western tropical Pacific, which is associated with the climatological mean precipitation in the tropical Pacific, could play an important role in modifying the WC trend in the CMIP5 climate models.},
doi = {10.3390/atmos7020019},
journal = {Atmosphere (Basel)},
number = 2,
volume = 7,
place = {United States},
year = {Fri Jan 29 00:00:00 EST 2016},
month = {Fri Jan 29 00:00:00 EST 2016}
}
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