Winter mean lower-tropospheric moisture over the maritime continent as a climate model diagnostic metric for the propagation of the Madden-Julian Oscillation

Gonzalez, Alex O.; Jiang, Xianan

doi:10.1002/2016GL072430

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Winter mean lower-tropospheric moisture over the maritime continent as a climate model diagnostic metric for the propagation of the Madden-Julian Oscillation

2017
By Gonzalez, Alex O. ; Jiang, Xianan
Source: Geophys. Res. Lett., 44, 2588– 2596

[PDF-793.33 KB]

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Journal Title:

Geophysical Research Letters
Personal Author:

Gonzalez, Alex O. ; Jiang, Xianan

Gonzalez, Alex O. ; Jiang, Xianan Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office)

OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office) Less -
Description:

Despite its widespread influences on the atmosphere, the Madden‐Julian oscillation (MJO) remains poorly represented in state‐of‐the‐art general circulation models (GCMs). Motivated by recent findings that the horizontal advection of the mean low‐tropospheric moist static energy or moisture by the MJO winds plays a crucial role in the eastward propagation of the MJO, we investigate the relationship between lower tropospheric moisture patterns over the Indo‐Pacific and MJO eastward propagation in a suite of 23 GCM simulations. Model capability of reproducing the observed November–April mean lower tropospheric moisture pattern over the Indo‐Pacific, especially near the Maritime Continent (MC), is highly correlated with model skill in simulating MJO eastward propagation. In GCMs with difficulty capturing realistic MJO propagation, the amplitude of the mean low‐level moisture over the MC is greatly underestimated, leading to weak horizontal moisture gradients and thus discrepancies in moisture advection, significantly affecting MJO propagation. This study suggests that the mean lower tropospheric moisture pattern over the MC can serve as an important diagnostic metric for MJO propagation in climate models.
Keywords:

[+]

Climatology Madden-Julian Oscillation Models Moisture Ocean Circulation Climate Models General Circulation Models Maritime Continent Low‐level Moisture
Source:

Geophys. Res. Lett., 44, 2588– 2596
DOI:

https://doi.org/10.1002/2016GL072430
Document Type:

Journal Article
Funding:

Grant no. NA12OAR4310075 ; Grant no. NA15OAR4310098 ; Grant no. NA15OAR4310177

Grant no. NA12OAR4310075 ; Grant no. NA15OAR4310098 ; Grant no. NA15OAR4310177 Less -
Rights Information:

CC BY-NC-ND
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Submitted
Main Document Checksum:

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urn:sha256:8c6c63305b6355451db3590064c8d3fe3aa92a4e3402a38ea14a3cc5b64f1652
Download URL:

https://repository.library.noaa.gov/view/noaa/28394/noaa_28394_DS1.pdf
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Winter mean lower-tropospheric moisture over the maritime continent as a climate model diagnostic metric for the propagation of the Madden-Julian Oscillation

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