DOI: 10.1175/JCLI-D-16-0090.1
Scopus记录号: 2-s2.0-85000977800
论文题名: Modeling the mechanisms of linear and nonlinear ENSO responses to the pacific meridional mode
作者: Thomas E.E. ; Vimont D.J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 24 起始页码: 8745
结束页码: 8761
语种: 英语
Scopus关键词: Atmospheric pressure
; Atmospheric temperature
; Heat flux
; Nickel
; Oceanography
; Sensitivity analysis
; Surface waters
; ENSO
; Interannual variability
; Intermediate coupled model
; National center for atmospheric researches
; Non-linear relationships
; Sea surface temperature (SST)
; Southern oscillation
; Tropical variability
; Climatology
英文摘要: Interactions between the Pacific meridional mode (PMM) and El Niño-Southern Oscillation (ENSO) are investigated using the National Center for Atmospheric Research (NCAR) Community Earth System Model (CESM) and an intermediate coupled model (ICM). The two models are configured so that the CESM simulates the PMM but not ENSO, and the ICM simulates ENSO but not the PMM, allowing for a clean separation between the PMM evolution and the subsequent ENSO response. An ensemble of CESM simulations is run with an imposed surface heat flux associated with the North Pacific Oscillation (NPO) generating a sea surface temperature (SST) and wind response representative of the PMM. The PMM wind is then applied as a forcing to the ICM to simulate the ENSO response. The positive (negative) ensemble-mean PMM wind forcing results in a warm (cold) ENSO event although the responses are not symmetric (warm ENSO events are larger in amplitude than cold ENSO events), and large variability between ensemble members suggests that any individual ENSO event is strongly influenced by natural variability contained within the CESM simulations. Sensitivity experiments show that 1) direct forcing of Kelvin waves by PMM winds dominates the ENSO response, 2) seasonality of PMM forcing and ENSO growth rates influences the resulting ENSO amplitude, 3) ocean dynamics within the ICM dominate the ENSO asymmetry, and 4) the nonlinear relationship between PMM wind anomalies and surface wind stress may enhance the La Niña response to negative PMM variations. Implications for ENSO variability are discussed. © 2016 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50258
Appears in Collections: 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 Wisconsin-Madison, Madison, WI, United States
Recommended Citation:
Thomas E.E.,Vimont D.J.. Modeling the mechanisms of linear and nonlinear ENSO responses to the pacific meridional mode[J]. Journal of Climate,2016-01-01,29(24)