DOI: 10.1175/JCLI-D-15-0790.1
Scopus记录号: 2-s2.0-84977558915
论文题名: Response of the superparameterized Madden-Julian oscillation to extreme climate and basic-state variation challenges a moisture mode view
作者: Pritchard M.S. ; Yang D.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 13 起始页码: 4995
结束页码: 5008
语种: 英语
Scopus关键词: Advection
; Atmospheric temperature
; Budget control
; Climate change
; Climate models
; Dynamics
; Moisture
; Oceanography
; Surface waters
; Tropics
; Cloud resolving model
; Geographic location
; Intraseasonal variability
; Madden-Julian oscillation
; Tropical variability
; Variability
; Climatology
; atmospheric moisture
; climate change
; cloud radiative forcing
; extreme event
; Madden-Julian oscillation
; seasonal variation
; tropical meteorology
英文摘要: The climate sensitivity of the Madden-Julian oscillation (MJO) is measured across a broad range of temperatures (1°-35°C) using a convection-permitting global climate model with homogenous sea surface temperatures. An MJO-like signal is found to be resilient in all simulations. These results are used to investigate two ideas related to the modern "moisture mode" view of MJO dynamics. The first hypothesis is that the MJO has dynamics analogous to a form of radiative convective self-aggregation in which longwave energy maintenance mechanisms shut down for SST ≪ 25°C. Inconsistent with this hypothesis, the explicitly simulated MJO survives cooling and retains leading moist static energy (MSE) budget terms associated with longwave destabilization even at SST < 10°C. Thus, if the MJO is a form of longwave-assisted self-aggregation, it is not one that is temperature critical, as is observed in some cases of radiative-convective equilibrium (RCE) self-aggregation. The second hypothesis is that the MJO is propagated by horizontal advection of column MSE. Inconsistent with this view, the simulated MJO survives reversal of meridional moisture gradients in the basic state and a striking role for horizontal MSE advection in its propagation energy budget cannot be detected. Rather, its eastward motion is balanced by vertical MSE advection reminiscent of gravity or Kelvin wave dynamics. These findings could suggest a tight relation between the MJO and classic equatorial waves, which would tend to challenge moisture mode views of MJO dynamics that assume horizontal moisture advection as the MJO's propagator. The simulation suite provides new opportunities for testing predictions from MJO theory across a broad climate regime. © 2016 American Meteorological Society. 资助项目: NSF, Norwegian Nurses Organisation
; DOE, U.S. Department of Energy
; DOE, U.S. Department of Energy
; NSF, Norwegian Nurses Organisation
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50281
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Earth System Sciences, University of California, Irvine, Irvine, CA, United States; Department of Earth and Planetary Science, University of California, Berkeley, Berkeley, CA, United States; Miller Institute for Basic Research in Science, University of California, Berkeley, Berkeley, CA, United States
Recommended Citation:
Pritchard M.S.,Yang D.. Response of the superparameterized Madden-Julian oscillation to extreme climate and basic-state variation challenges a moisture mode view[J]. Journal of Climate,2016-01-01,29(13)