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Title: The Boreal Summer Madden–Julian Oscillation and Moist Convective Morphology over the Maritime Continent

Abstract

Abstract While the boreal summer Madden–Julian oscillation (MJO) is commonly defined as a planetary-scale disturbance, the convective elements that constitute its cloud dipole exhibit pronounced variability in their morphology. We therefore investigate the relationship between the intraseasonal cloud anomaly of the MJO and the convective elements that populate its interior by simulating a boreal summer MJO event over the Maritime Continent using a cloud-resolving model. A progressive relationship between convective cell morphology and the MJO within the convectively enhanced region of the MJO was identified and characterized as follows: anomalously long-lasting cells in the initial phases, followed by an increased number of cells in the intermediate phases, progressing into more expansive cells in the terminal phases. A progressive relationship does not seem to exist within the convectively suppressed region of the MJO within the simulated domain, however. Within the convectively enhanced region of the MJO, the progressive relationship is partially explained by the evolution of bulk atmospheric characteristics, such as instability and wind shear. Positive midlevel moisture anomalies coincide with anomalously long-lasting convective cells, which is hypothesized to further cascade into an increase in convective cell volume, although variability in the number of convective cells seems to be related tomore » an unidentified variable. This intraseasonal relationship between convective cell morphology and the boreal summer MJO within the Maritime Continent may have broader implications for the large-scale structure and evolution of the MJO, related to both convective moistening and cloud-radiative feedbacks.« less

Authors:
 [1];  [1];  [1];  [1];  [1]
  1. Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1598087
Grant/Contract Number:  
FG02-97ER25308
Resource Type:
Journal Article: Published Article
Journal Name:
Journal of the Atmospheric Sciences
Additional Journal Information:
Journal Name: Journal of the Atmospheric Sciences Journal Volume: 77 Journal Issue: 2; Journal ID: ISSN 0022-4928
Publisher:
American Meteorological Society
Country of Publication:
United States
Language:
English

Citation Formats

Toms, Benjamin A., van den Heever, Susan C., Riley Dellaripa, Emily M., Saleeby, Stephen M., and Maloney, Eric D. The Boreal Summer Madden–Julian Oscillation and Moist Convective Morphology over the Maritime Continent. United States: N. p., 2020. Web. doi:10.1175/JAS-D-19-0029.1.
Toms, Benjamin A., van den Heever, Susan C., Riley Dellaripa, Emily M., Saleeby, Stephen M., & Maloney, Eric D. The Boreal Summer Madden–Julian Oscillation and Moist Convective Morphology over the Maritime Continent. United States. https://doi.org/10.1175/JAS-D-19-0029.1
Toms, Benjamin A., van den Heever, Susan C., Riley Dellaripa, Emily M., Saleeby, Stephen M., and Maloney, Eric D. Thu . "The Boreal Summer Madden–Julian Oscillation and Moist Convective Morphology over the Maritime Continent". United States. https://doi.org/10.1175/JAS-D-19-0029.1.
@article{osti_1598087,
title = {The Boreal Summer Madden–Julian Oscillation and Moist Convective Morphology over the Maritime Continent},
author = {Toms, Benjamin A. and van den Heever, Susan C. and Riley Dellaripa, Emily M. and Saleeby, Stephen M. and Maloney, Eric D.},
abstractNote = {Abstract While the boreal summer Madden–Julian oscillation (MJO) is commonly defined as a planetary-scale disturbance, the convective elements that constitute its cloud dipole exhibit pronounced variability in their morphology. We therefore investigate the relationship between the intraseasonal cloud anomaly of the MJO and the convective elements that populate its interior by simulating a boreal summer MJO event over the Maritime Continent using a cloud-resolving model. A progressive relationship between convective cell morphology and the MJO within the convectively enhanced region of the MJO was identified and characterized as follows: anomalously long-lasting cells in the initial phases, followed by an increased number of cells in the intermediate phases, progressing into more expansive cells in the terminal phases. A progressive relationship does not seem to exist within the convectively suppressed region of the MJO within the simulated domain, however. Within the convectively enhanced region of the MJO, the progressive relationship is partially explained by the evolution of bulk atmospheric characteristics, such as instability and wind shear. Positive midlevel moisture anomalies coincide with anomalously long-lasting convective cells, which is hypothesized to further cascade into an increase in convective cell volume, although variability in the number of convective cells seems to be related to an unidentified variable. This intraseasonal relationship between convective cell morphology and the boreal summer MJO within the Maritime Continent may have broader implications for the large-scale structure and evolution of the MJO, related to both convective moistening and cloud-radiative feedbacks.},
doi = {10.1175/JAS-D-19-0029.1},
url = {https://www.osti.gov/biblio/1598087}, journal = {Journal of the Atmospheric Sciences},
issn = {0022-4928},
number = 2,
volume = 77,
place = {United States},
year = {2020},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at https://doi.org/10.1175/JAS-D-19-0029.1

Citation Metrics:
Cited by: 2 works
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