The Role of the Background Meridional Moisture Gradient on the Propagation of the Madden-Julian oscillation over the Maritime Continent

Kang, Daehyun; Kim, Daehyun; Ahn, Min-Seop; An, Soon-Il

doi:10.1175/JCLI-D-20-0085.1

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The Role of the Background Meridional Moisture Gradient on the Propagation of the Madden-Julian oscillation over the Maritime Continent

2021
By Kang, Daehyun ; Kim, Daehyun ; Ahn, Min-Seop ; ...
Source: Journal of Climate, 34(16), 6565-6581

[PDF-4.07 MB]

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Journal Title:

Journal of Climate
Personal Author:

Kang, Daehyun ; Kim, Daehyun ; Ahn, Min-Seop ; An, Soon-Il

Kang, Daehyun ; Kim, Daehyun ; Ahn, Min-Seop ; An, Soon-Il Less -
NOAA Program & Office:

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

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

This study investigates the role of the background meridional moisture gradient (MMG) on the propagation of the Madden–Julian oscillation (Madden-Julian oscillation) across the Maritime Continent (MC) region. It is found that the interannual variability of the seasonal mean MMG over the southern MC area is associated with the meridional expansion and contraction of the moist area in the vicinity of the MC. Sea surface temperature anomalies associated with relatively high and low seasonal mean MMG exhibit patterns that resemble those of El Niño–Southern Oscillation. By contrasting the years with anomalously low and high MMG, we show that Madden-Julian oscillation propagation through the MC is enhanced (suppressed) in years with higher (lower) seasonal mean MMG, although the effect is less robust when MMG anomalies are weak. Column-integrated moisture budget analysis further shows that sufficiently large MMG anomalies affect Madden-Julian oscillation activity by modulating the meridional advection of the mean moisture via Madden-Julian oscillation wind anomalies. Our results suggest that the background moisture distribution has a strong control over the propagation characteristics of the Madden-Julian oscillation in the MC region.
Keywords:

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Intraseasonal Variability Madden-Julian Oscillation Maritime Continent Tropical Variability
Source:

Journal of Climate, 34(16), 6565-6581
DOI:

https://doi.org/10.1175/JCLI-D-20-0085.1
Document Type:

Journal Article
Funding:

Grant no. NA18OAR4310300
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Submitted
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urn:sha256:2a6f70be8b24f60c96b0ede28dbcc4e7145702b0cac5ae9bae52e88f0280fa06
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https://repository.library.noaa.gov/view/noaa/32628/noaa_32628_DS1.pdf
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The Role of the Background Meridional Moisture Gradient on the Propagation of the Madden-Julian oscillation over the Maritime Continent

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