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Title: The impact of the diurnal cycle on the propagation of Madden-Julian Oscillation convection across the Maritime Continent

Journal Article · · Journal of Advances in Modeling Earth Systems
DOI:https://doi.org/10.1002/2016MS000725· OSTI ID:1347866
 [1];  [2];  [1];  [1];  [3];  [2];  [2];  [4]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. Univ. of Miami, Miami, FL (United States)
  3. Colorado State Univ., Fort Collins, CO (United States)
  4. Naval Research Lab., Monterey, CA (United States)
+ Show Author Affiliations

Influences of the diurnal cycle of convection on the propagation of the Madden-Julian Oscillation (MJO) across the Maritime Continent (MC) are examined using cloud-permitting regional model simulations and observations. A pair of ensembles of control (CONTROL) and no-diurnal cycle (NODC) simulations of the November 2011 MJO episode are performed. In the CONTROL simulations, the MJO signal is weakened as it propagates across the MC, with much of the convection stalling over the large islands of Sumatra and Borneo. In the NODC simulations, where the incoming shortwave radiation at the top of the atmosphere is maintained at its daily mean value, the MJO signal propagating across the MC is enhanced. Examination of the surface energy fluxes in the simulations indicates that in the presence of the diurnal cycle, surface downwelling shortwave radiation in CONTROL simulations is larger because clouds preferentially form in the afternoon. Furthermore, the diurnal co-variability of surface wind speed and skin temperature results in a larger sensible heat flux and a cooler land surface in CONTROL compared to NODC simulations. Here, an analysis of observations indicates that the modulation of the downwelling shortwave radiation at the surface by the diurnal cycle of cloudiness negatively projects on the MJO intraseasonal cycle and therefore disrupts the propagation of the MJO across the MC.

Research Organization:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1347866
Report Number(s):
PNNL-SA-118613; KP1701000
Journal Information:
Journal of Advances in Modeling Earth Systems, Vol. 8, Issue 4; ISSN 1942-2466
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 70 works
Citation information provided by
Web of Science

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Cited By (6)

QBO-MJO Connection journal March 2018
Contemporary GCM Fidelity in Representing the Diurnal Cycle of Precipitation Over the Maritime Continent journal January 2019
Physical Mechanisms Controlling the Offshore Propagation of Convection in the Tropics: 2. Influence of Topography journal October 2019
Impact of cold surges on the Madden-Julian oscillation propagation over the Maritime Continent journal September 2018
Role of topography on the MJO in the maritime continent: a numerical case study journal May 2018
Diurnal cycle of rainfall and convection over the Maritime Continent using TRMM and ISCCP journal May 2019

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Related Subjects

58 GEOSCIENCES
diurnal cycle
Madden-Julian Oscillation
Maritime Continent