Convective moisture adjustment time scale as a key factor in regulating model amplitude of the Madden-Julian Oscillation

Jiang, Xianan; Zhao, Ming; Maloney, Eric D.; Waliser, Duane E.

doi:10.1002/2016GL070898

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Convective moisture adjustment time scale as a key factor in regulating model amplitude of the Madden-Julian Oscillation

2016
By Jiang, Xianan ; Zhao, Ming ; Maloney, Eric D. ; ...
Source: Geophys. Res. Lett., 43, 10,412– 10,419

[PDF-1.67 MB]

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Journal Title:

Geophysical Research Letters
Personal Author:

Jiang, Xianan ; Zhao, Ming ; Maloney, Eric D. ; Waliser, Duane E.

Jiang, Xianan ; Zhao, Ming ; Maloney, Eric D. ; Waliser, Duane E. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; GFDL (Geophysical Fluid Dynamics Laboratory) ; CPO (Climate Program Office) ; CIMEAS (Cooperative Institute for Marine, Earth, and Atmospheric Systems) ; CIRA (Cooperative Institute for Research in the Atmosphere)

OAR (Oceanic and Atmospheric Research) ; GFDL (Geophysical Fluid Dynamics Laboratory) ; CPO (Climate Program Office) ; CIMEAS (Cooperative Institute for Marine, Earth, and Atmospheric Systems) ; CIRA (Cooperative Institute for Research in the Atmosphere) Less -
Description:

Despite its pronounced impacts on weather extremes worldwide, the Madden-Julian Oscillation(MJO) remains poorly represented in climate models. Here we present ﬁndings that point to some necessaryingredients to produce a strong MJO amplitude in a large set of model simulations from a recent modelintercomparison project. While surface ﬂux and radiative heating anomalies are considered important foramplifying the MJO, their strength per unit MJO precipitation anomaly is found to be negatively correlated toMJO amplitude across these multimodel simulations. However, model MJO amplitude is found to be closelytied to a model’s convective moisture adjustment time scale, a measure of how rapidly precipitation mustincrease to remove excess column water vapor, or alternately the efﬁciency of surface precipitationgeneration per unit column water vapor anomaly. These ﬁndings provide critical insights into key modelprocesses for the MJO and pinpoint a direction for improved model representation of the MJO.
Keywords:

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Climatic Changes Convection Madden-Julian Oscillation Models Tropics Adjustment Time Scale Climate Models Convective Tropical Convection
Source:

Geophys. Res. Lett., 43, 10,412– 10,419
DOI:

https://doi.org/10.1002/2016GL070898
Document Type:

Journal Article
Funding:

Grant no. NA15OAR4310098 ; Grant no. NA12OAR4310075 ; Grant no. NA15OAR4310177 ; Grant no. NA13OAR431016 ; Grant no. NA15OAR4310099

Grant no. NA15OAR4310098 ; Grant no. NA12OAR4310075 ; Grant no. NA15OAR4310177 ; Grant no. NA13OAR431016 ; Grant no. NA15OAR4310099 Less -
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urn:sha256:f2a3c41ac9c03a401f94c4e8eb1e6f3308413ed5330f54818adf0960b755f2a4
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https://repository.library.noaa.gov/view/noaa/28346/noaa_28346_DS1.pdf
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Convective moisture adjustment time scale as a key factor in regulating model amplitude of the Madden-Julian Oscillation

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