DOI: 10.1175/JCLI-D-17-0691.1
Scopus记录号: 2-s2.0-85053061544
论文题名: Role of North Indian Ocean air-sea interaction in summer monsoon intraseasonal oscillation
作者: Zhang L. ; Han W. ; Li Y. ; Maloney E.D.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 19 起始页码: 7885
结束页码: 7908
语种: 英语
英文关键词: Air-sea interaction
; Intraseasonal variability
; Monsoons
Scopus关键词: Atmospheric thermodynamics
; Boundary layers
; Climate change
; Heat flux
; Hurricane effects
; Surface waters
; Tropical engineering
; Air sea interactions
; Air-sea interaction process
; Equatorial Indian Ocean
; Intraseasonal oscillations
; Intraseasonal variability
; Monsoons
; Sea surface temperature (SST)
; Surface latent heat fluxes
; Oceanography
英文摘要: Air-sea coupling processes over the north Indian Ocean associated with the Indian summer monsoon intraseasonal oscillation (MISO) are investigated. Observations show that MISO convection anomalies affect underlying sea surface temperature (SST) through changes in surface shortwave radiation and surface latent heat flux. In turn, SST anomalies may also affect the MISO precipitation tendency (dP/dt). In particular, warm (cold) SST anomalies can contribute to increasing (decreasing) precipitation rate through enhanced (suppressed) surface convergence associated with boundary layer pressure gradients. These air-sea interaction processes are manifest in a quadrature relation between MISO precipitation and SST anomalies. A local air-sea coupling model (LACM) is formulated based on these observed physical processes. The period of the LACM is proportional to the square root of seasonal mixed layer depth H, assuming other physical parameters remain unchanged. Hence, LACM predicts a relatively short (long) MISO period over the north Indian Ocean during the May-June monsoon developing (July-August monsoon mature) phase when H is shallow (deep). This result is consistent with observed MISO characteristics. A 30-day-period oscillating external forcing is also added to the LACM, representing intraseasonal oscillations propagating from the equatorial Indian Ocean to the north Indian Ocean. It is found that resonance will occur when H is close to 25 m, which significantly enhances the MISO amplitude. This process may contribute to the higher MISO amplitude during the monsoon developing phase compared to the mature phase, which is associated with the seasonal cycle of H. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110656
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Atmospheric and Oceanic Sciences, University of Colorado Boulder, Boulder, CO, United States; Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States
Recommended Citation:
Zhang L.,Han W.,Li Y.,et al. Role of North Indian Ocean air-sea interaction in summer monsoon intraseasonal oscillation[J]. Journal of Climate,2018-01-01,31(19)