DOI: 10.1175/JCLI-D-14-00141.1
Scopus记录号: 2-s2.0-84909581783
论文题名: Coupled impacts of the diurnal cycle of sea surface temperature on the Madden-Julian oscillation
作者: Seo H. ; Subramanian A.C. ; Miller A.J. ; Cavanaugh N.R.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 22 起始页码: 8422
结束页码: 8443
语种: 英语
Scopus关键词: Atmospheric temperature
; Budget control
; Climatology
; Computer simulation
; Heat flux
; Natural convection
; Surface properties
; Air sea interactions
; Deep convection
; Diurnal effects
; Madden-Julian oscillation
; Numerical weather prediction/forecasting
; Regional model
; Oceanography
; air-sea interaction
; atmospheric convection
; climate prediction
; diurnal variation
; latent heat flux
; Madden-Julian oscillation
; numerical model
; sea surface temperature
; weather forecasting
; Indian Ocean
英文摘要: This study quantifies, from a systematic set of regional ocean-atmosphere coupled model simulations employing various coupling intervals, the effect of subdaily sea surface temperature (SST) variability on the onset and intensity of Madden-Julian oscillation (MJO) convection in the Indian Ocean. The primary effect of diurnal SST variation (dSST) is to raise time-mean SST and latent heat flux (LH) prior to deep convection. Diurnal SST variation also strengthens the diurnal moistening of the troposphere by collocating the diurnal peak in LH with those of SST. Both effects enhance the convection such that the total precipitation amount scales quasi-linearly with preconvection dSST and time-mean SST. A column-integrated moist static energy (MSE) budget analysis confirms the critical role of diurnal SST variability in the buildup of column MSE and the strength of MJO convection via stronger time-mean LH and diurnal moistening. Two complementary atmosphere-only simulations further elucidate the role of SST conditions in the predictive skill of MJO. The atmospheric model forced with the persistent initial SST, lacking enhanced preconvection warming and moistening, produces a weaker and delayed convection than the diurnally coupled run. The atmospheric model with prescribed daily-mean SST from the coupled run, while eliminating the delayed peak, continues to exhibit weaker convection due to the lack of strong moistening on a diurnal basis. The fact that time-evolving SST with a diurnal cycle strongly influences the onset and intensity of MJO convection is consistent with previous studies that identified an improved representation of diurnal SST as a potential source of MJO predictability. © 2014 American Meteorological Society. 资助项目: NCAR, National Science Foundation
; NSF, National Science Foundation
; NSF, National Science Foundation
; NSF, National Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51104
Appears in Collections: 气候变化事实与影响
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作者单位: Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Scripps Institution of Oceanography, La Jolla, CA, United States
Recommended Citation:
Seo H.,Subramanian A.C.,Miller A.J.,et al. Coupled impacts of the diurnal cycle of sea surface temperature on the Madden-Julian oscillation[J]. Journal of Climate,2014-01-01,27(22)