Investigating Recent Changes in MJO Precipitation and Circulation in Multiple Reanalyses

Hsiao, Wei‐Ting; Maloney, Eric D.; Barnes, Elizabeth A.

doi:10.1029/2020gl090139

i

Investigating Recent Changes in MJO Precipitation and Circulation in Multiple Reanalyses

Supporting Files

2020
By Hsiao, Wei‐Ting ; Maloney, Eric D. ; Barnes, Elizabeth A.

Details

Journal Title:

Geophysical Research Letters
Personal Author:

Hsiao, Wei‐Ting ; Maloney, Eric D. ; Barnes, Elizabeth A.
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research)
Description:

Recent work using CMIP5 models under RCP8.5 suggests that individual multimodel mean changes in precipitation and wind variability associated with the Madden‐Julian oscillation (MJO) are not detectable until the end of the 21st century. However, a decrease in the ratio of MJO circulation to precipitation anomaly amplitude is detectable as early as 2021–2040, consistent with an increase in dry static stability as predicted by weak temperature gradient balance. Here, we examine MJO activity in multiple reanalyses (ERA5, MERRA‐2, and ERA‐20C) and find that MJO wind and precipitation anomaly amplitudes have a complicated time evolution over the record. However, a decrease in the ratio of MJO circulation to precipitation anomaly amplitude is detected over the observational period, consistent with the change in dry static stability. These results suggest that weak temperature gradient theory may be able to help explain changes in MJO activity in recent decades.
Keywords:

General Earth And Planetary Sciences Geophysics General Earth And Planetary Sciences General Earth And Planetary Sciences
Source:

Geophysical Research Letters, 47(22)
DOI:

https://doi.org/10.1029/2020gl090139
ISSN:

0094-8276 ; 1944-8007
Format:

PDF
Publisher:

American Geophysical Union (AGU)
Document Type:

Journal Article
Funding:

Grant no. NA16OAR4310064 ; Grant no. NA19OAR4590151
License:

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

CC BY
Compliance:

Library
Main Document Checksum:

urn:sha256:3ac7795c475993248b22c3786af4aee25916f72eadd3d7564431fdacd61be9f2
Download URL:

https://repository.library.noaa.gov/view/noaa/58171/noaa_58171_DS1.pdf
File Type:

[PDF - 2.84 MB ]

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