How Important Are Horizontal Eddy Moisture Transports for the MJO's Eastward Propagation?

Tulich, S. N.

doi:10.1029/2023gl103944

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How Important Are Horizontal Eddy Moisture Transports for the MJO's Eastward Propagation?

2023
By Tulich, S. N.
Source: Geophysical Research Letters, 50(13)

[PDF-458.04 KB]

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Details:

Journal Title:

Geophysical Research Letters
Personal Author:

Tulich, S. N.
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; CIRES (Cooperative Institute for Research in Environmental Sciences) ; PSL (Physical Sciences Laboratory)

OAR (Oceanic and Atmospheric Research) ; CIRES (Cooperative Institute for Research in Environmental Sciences) ; PSL (Physical Sciences Laboratory) Less -
Description:

The eastward propagation of the Madden‐Julian oscillation (MJO) is known to hinge crucially on the effects of horizontal moisture advection, which involve two main types of circulation anomalies. The first are those of the MJO itself, while the second are those of embedded Rossby‐type “eddies,” which tend to be most active to the west of the MJO's convective center. To quantify the relative importance of the eddies, a novel approach is taken in which their formal definition is given by the residual of a least‐squares fit to an observed bivariate MJO index. Results show that the eddies, when defined in this way, are generally of leading importance for fostering the MJO's eastward propagation in terms of column‐integrated moisture. The picture is seen to be reversed, however, when using a traditional filter‐based method to define the eddies, which are then strictly “high‐frequency” in nature.
Keywords:

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General Earth And Planetary Sciences Geophysics
Source:

Geophysical Research Letters, 50(13)
DOI:

https://doi.org/10.1029/2023gl103944
ISSN:

0094-8276;1944-8007;
Publisher:

American Geophysical Union (AGU)
Document Type:

Journal Article
License:

https://creativecommons.org/licenses/by-nc/4.0/
Rights Information:

CC BY-NC
Compliance:

Library
Main Document Checksum:

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urn:sha256:5f740c9d3a0484e4773ff8dcbe0b75ccee17b94ead257080115849d84f8b8a82
Download URL:

https://repository.library.noaa.gov/view/noaa/59247/noaa_59247_DS1.pdf
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Machine readable version (XML)

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