DOI: 10.1002/2015MS000530
Scopus记录号: 2-s2.0-84959458262
论文题名: Sensitivity of MJO propagation to a robust positive Indian Ocean dipole event in the superparameterized CAM
作者: Benedict J ; J ; , Pritchard M ; S ; , Collins W ; D
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2015
卷: 7, 期: 4 起始页码: 1901
结束页码: 1917
语种: 英语
英文关键词: Atmospheric temperature
; Climate change
; Climatology
; Surface waters
; Tropics
; ENSO
; Indian Ocean dipole
; Intraseasonal variability
; Madden-Julian oscillation
; Superparameterization
; Tropical convection
; Oceanography
; air mass
; anomaly
; climate modeling
; convection
; El Nino-Southern Oscillation
; Indian Ocean Dipole
; Madden-Julian oscillation
; oscillation
; Rossby wave
; sea surface temperature
; seasonal variation
; tropical environment
; wind profile
; zonal wind
; Indian Ocean
; Pacific Ocean
; Pacific Ocean (Equatorial)
英文摘要: The superparameterized Community Atmosphere Model (SPCAM) is used to investigate the impact and geographic sensitivity of positive Indian Ocean Dipole (+IOD) sea-surface temperatures (SSTs) on Madden-Julian oscillation (MJO) propagation. The goal is to clarify potentially appreciable +IOD effects on MJO dynamics detected in prior studies by using a global model with explicit convection representation. Prescribed climatological October SSTs and variants of the SST distribution from October 2006, a +IOD event, force the model. Modest MJO convection weakening over the Maritime Continent occurs when either climatological SSTs, or +IOD SST anomalies restricted to the Indian Ocean, are applied. However, severe MJO weakening occurs when either +IOD SST anomalies are applied globally or restricted to the equatorial Pacific. MJO disruption is associated with time-mean changes in the zonal wind profile and lower moist static energy (MSE) in subsiding air masses imported from the Subtropics by Rossby-like gyres. On intraseasonal scales, MJO disruption arises from significantly smaller MSE accumulation, weaker meridional advective moistening, and overactive submonthly eddies that mix drier subtropical air into the path of MJO convection. These results (1) demonstrate that SPCAM reproduces observed time-mean and intraseasonal changes during +IOD episodes, (2) reaffirm the role that submonthly eddies play in MJO propagation and show that such multiscale interactions are sensitive to interannual SST states, and (3) suggest that boreal fall +IOD SSTs local to the Indian Ocean have a significantly smaller impact on Maritime Continent MJO propagation compared to contemporaneous Pacific SST anomalies which, for October 2006, resemble El Ninõ-like conditions. © 2015. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75945
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Department of Climate Sciences, Lawrence Berkeley National Laboratory, Berkeley, CA, United States; Now at Rosenstiel School of Marine and Atmospheric Science, University of Miami, Florida, United States; Department of Earth System Science, University of California-Irvine, Irvine, CA, United States; Department of Earth and Planetary Science, University of California-Berkeley, Berkeley, CA, United States
Recommended Citation:
Benedict J,J,, Pritchard M,et al. Sensitivity of MJO propagation to a robust positive Indian Ocean dipole event in the superparameterized CAM[J]. Journal of Advances in Modeling Earth Systems,2015-01-01,7(4)