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Title: Impacts of Insolation and Soil Moisture on the Seasonality of Interactions Between the Madden‐Julian Oscillation and Maritime Continent

Abstract

This study aims to improve understanding the seasonality of how the Madden-Julian Oscillation (MJO) interacts with the Maritime Continent (MC). Besides responding to the monsoonal east-west movement, observations show that the MJO amplitude and precipitation over the MC islands exhibit semi-annual variability, with apparent strengthening of MJO signal during March and September, when solar insolation is strongest over the MC region. Furthermore, during the high insolation months, soil moisture shows wetter conditions during the early phases of the MJO. Motivated by these results a series of regional convection permitting simulations are performed for the November 2014 MJO event as a case study under the following conditions: (i) increased solar insolation to mimic the local summer, (ii) reduced initial soil moisture and (iii) the two conditions combined. Results show that increased insolation increases precipitation including that associated with MJO moisture convergence over the MC region. On the other hand, decreased initial soil moisture slightly increases precipitation over the MC islands and reduces it over the surrounding waters, but such effect is short lived as the increased precipitation gradually restores the soil moisture to wetter conditions. Using a moisture budget analysis that isolates the MJO and non-MJO signals and additional idealized simulations,more » the MJO response to high insolation and initial dry soil conditions is demonstrated to be related to the response of the basic state moisture distribution over the MC region rather than a direct response of the MJO to the insolation and soil moisture anomalies.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Pacific Northwest National Laboratory Richland WA USA
  2. NOAA Pacific Marine Environmental Laboratory Seattle WA USA
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1635063
Alternate Identifier(s):
OSTI ID: 1635066; OSTI ID: 1647582
Report Number(s):
PNNL-SA-150515
Journal ID: ISSN 2169-897X
Grant/Contract Number:  
AC05‐76RLO1830; AC05-76RL01830
Resource Type:
Published Article
Journal Name:
Journal of Geophysical Research: Atmospheres
Additional Journal Information:
Journal Name: Journal of Geophysical Research: Atmospheres Journal Volume: 125 Journal Issue: 13; Journal ID: ISSN 2169-897X
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Hagos, Samson, Zhang, Chidong, Leung, L. Ruby, Garuba, Oluwayemi, Burleyson, Casey D., and Balaguru, Karthik. Impacts of Insolation and Soil Moisture on the Seasonality of Interactions Between the Madden‐Julian Oscillation and Maritime Continent. United States: N. p., 2020. Web. doi:10.1029/2020JD032382.
Hagos, Samson, Zhang, Chidong, Leung, L. Ruby, Garuba, Oluwayemi, Burleyson, Casey D., & Balaguru, Karthik. Impacts of Insolation and Soil Moisture on the Seasonality of Interactions Between the Madden‐Julian Oscillation and Maritime Continent. United States. doi:https://doi.org/10.1029/2020JD032382
Hagos, Samson, Zhang, Chidong, Leung, L. Ruby, Garuba, Oluwayemi, Burleyson, Casey D., and Balaguru, Karthik. Wed . "Impacts of Insolation and Soil Moisture on the Seasonality of Interactions Between the Madden‐Julian Oscillation and Maritime Continent". United States. doi:https://doi.org/10.1029/2020JD032382.
@article{osti_1635063,
title = {Impacts of Insolation and Soil Moisture on the Seasonality of Interactions Between the Madden‐Julian Oscillation and Maritime Continent},
author = {Hagos, Samson and Zhang, Chidong and Leung, L. Ruby and Garuba, Oluwayemi and Burleyson, Casey D. and Balaguru, Karthik},
abstractNote = {This study aims to improve understanding the seasonality of how the Madden-Julian Oscillation (MJO) interacts with the Maritime Continent (MC). Besides responding to the monsoonal east-west movement, observations show that the MJO amplitude and precipitation over the MC islands exhibit semi-annual variability, with apparent strengthening of MJO signal during March and September, when solar insolation is strongest over the MC region. Furthermore, during the high insolation months, soil moisture shows wetter conditions during the early phases of the MJO. Motivated by these results a series of regional convection permitting simulations are performed for the November 2014 MJO event as a case study under the following conditions: (i) increased solar insolation to mimic the local summer, (ii) reduced initial soil moisture and (iii) the two conditions combined. Results show that increased insolation increases precipitation including that associated with MJO moisture convergence over the MC region. On the other hand, decreased initial soil moisture slightly increases precipitation over the MC islands and reduces it over the surrounding waters, but such effect is short lived as the increased precipitation gradually restores the soil moisture to wetter conditions. Using a moisture budget analysis that isolates the MJO and non-MJO signals and additional idealized simulations, the MJO response to high insolation and initial dry soil conditions is demonstrated to be related to the response of the basic state moisture distribution over the MC region rather than a direct response of the MJO to the insolation and soil moisture anomalies.},
doi = {10.1029/2020JD032382},
journal = {Journal of Geophysical Research: Atmospheres},
number = 13,
volume = 125,
place = {United States},
year = {2020},
month = {6}
}

Journal Article:
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DOI: https://doi.org/10.1029/2020JD032382

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