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

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Title: Impacts of Insolation and Soil Moisture on the Seasonality of Interactions Between the Madden‐Julian Oscillation and Maritime Continent.
Authors: Hagos, Samson1 samson.hagos@pnnl.gov, Zhang, Chidong2, Leung, L. Ruby1, Garuba, Oluwayemi1, Burleyson, Casey D.1, Balaguru, Karthik1
Source: Journal of Geophysical Research. Atmospheres. 7/16/2020, Vol. 125 Issue 13, p1-14. 14p.
Subject Terms: *Soil moisture, *Climate change, Budget analysts, Atmospheric models, Cloudiness
Abstract: This study investigates the seasonality of the interaction of the Madden‐Julian Oscillation (MJO) with the Maritime Continent (MC). Beside their seasonal east‐west migration with the monsoons, observations show that the MJO amplitude and precipitation over the MC islands exhibit semiannual 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 to isolate their local effects from their impacts on the large‐scale circulation. 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 is demonstrated to be related to an increase in the basic state moisture over the MC region rather than a direct response of the MJO to the insolation. Key Points: In addition to the annual cycle, there is a semiannual variability in MJO amplitude and associated precipitation over the MC regionThis variability is shown to be related to solar insolation over the islands that increases the background moisture over the regionThe effect of reduced soil moisture is weaker and short lived as MJO precipitation arrives earlier and recovers the soil moisture [ABSTRACT FROM AUTHOR]
Copyright of Journal of Geophysical Research. Atmospheres is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Impacts of Insolation and Soil Moisture on the Seasonality of Interactions Between the Madden‐Julian Oscillation and Maritime Continent.
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  Data: <searchLink fieldCode="AR" term="%22Hagos%2C+Samson%22">Hagos, Samson</searchLink><relatesTo>1</relatesTo><i> samson.hagos@pnnl.gov</i><br /><searchLink fieldCode="AR" term="%22Zhang%2C+Chidong%22">Zhang, Chidong</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Leung%2C+L%2E+Ruby%22">Leung, L. Ruby</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Garuba%2C+Oluwayemi%22">Garuba, Oluwayemi</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Burleyson%2C+Casey+D%2E%22">Burleyson, Casey D.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Balaguru%2C+Karthik%22">Balaguru, Karthik</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Geophysical+Research%2E+Atmospheres%22">Journal of Geophysical Research. Atmospheres</searchLink>. 7/16/2020, Vol. 125 Issue 13, p1-14. 14p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Soil+moisture%22">Soil moisture</searchLink><br />*<searchLink fieldCode="DE" term="%22Climate+change%22">Climate change</searchLink><br /><searchLink fieldCode="DE" term="%22Budget+analysts%22">Budget analysts</searchLink><br /><searchLink fieldCode="DE" term="%22Atmospheric+models%22">Atmospheric models</searchLink><br /><searchLink fieldCode="DE" term="%22Cloudiness%22">Cloudiness</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: This study investigates the seasonality of the interaction of the Madden‐Julian Oscillation (MJO) with the Maritime Continent (MC). Beside their seasonal east‐west migration with the monsoons, observations show that the MJO amplitude and precipitation over the MC islands exhibit semiannual 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 to isolate their local effects from their impacts on the large‐scale circulation. 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 is demonstrated to be related to an increase in the basic state moisture over the MC region rather than a direct response of the MJO to the insolation. Key Points: In addition to the annual cycle, there is a semiannual variability in MJO amplitude and associated precipitation over the MC regionThis variability is shown to be related to solar insolation over the islands that increases the background moisture over the regionThe effect of reduced soil moisture is weaker and short lived as MJO precipitation arrives earlier and recovers the soil moisture [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Geophysical Research. Atmospheres is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1029/2020JD032382
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      – Code: eng
        Text: English
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        PageCount: 14
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      – SubjectFull: Soil moisture
        Type: general
      – SubjectFull: Climate change
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      – SubjectFull: Budget analysts
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      – SubjectFull: Atmospheric models
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      – SubjectFull: Cloudiness
        Type: general
    Titles:
      – TitleFull: Impacts of Insolation and Soil Moisture on the Seasonality of Interactions Between the Madden‐Julian Oscillation and Maritime Continent.
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            NameFull: Hagos, Samson
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              Text: 7/16/2020
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