A composite study of the Madden-Julian Oscillation (MJO) and northeasterly cold-surges during the northern winter monsoon

Download
Author
Simms, John W.
Date
2000-03-01Advisor
Chang, Chih-Pei
Harr, Patrick A.
Metadata
Show full item recordAbstract
During the northern winter monsoon, the Madden-Julian Oscillation (MJO) and northeasterly cold-surges are active over the eastern Indian Ocean and western Pacific. The MJO consists of an active (wet) phase and inactive (dry) phase and varies over global spatial and intraseasonal time scales. Interactions between the MJO and northeasterly cold-surges, which vary over regional space and synoptic time scales, are examined. The interactions are examined between 1979-1998 using winds at 1000 hPa and a representation of convection during the northern winter monsoon. To identify interactions, the active and inactive phases of the MJO are divided into early or late phases (based on MJO duration). Examination of composite maps based on cold-surges defined to occur during each phase of the MJO revealed that the phase of the MJO acts to either enhance or weaken a cold-surge that may have been forced by the mid-latitudes. When MJO convection is located over the South China Sea, the surge intensifies. The favorable convection pattern dominates the unfavorable pressure-wind pattern of the MJO. When the MJO dry-phase is over the South China Sea, mid-latitude forcing appears to interact favorably with the pressure-wind pattern of the MJO to dominate the unfavorable MJO convection pattern
Collections
Related items
Showing items related by title, author, creator and subject.
-
Synoptic disturbances over the equatorial South China Sea and western Maritime Continent during boreal winter
Chang, C.-P.; Harr, P.A.; Chen, H.J. (2005);During boreal winter, the Maritime Continent is a region of deep cumulus convection and heavy precipitation systems that play a major role in several global- and regional-scale processes. Over the western part of this ... -
Impacts of Boreal Winter Monsoon Cold Surges and the Interaction with MJO on Southeast Asia Rainfall
Lim, See Yee; Marzin, Charline; Xavier, Prince; Chang, Chih-Pei; Timbal, Bertrand (American Meteorological Society, 2017-06);TRMM rainfall data from 1998–2012 are used to study the impacts and interactions of cold surges (CSs) and the Madden–Julian oscillation (MJO) on rainfall over Southeast Asia during the boreal winter season from November ... -
Interactions of large-scale tropical motion systems during the 1996-1997 Australian monsoon
Taylor, Sylvia C. (Monterey, California. Naval Postgraduate School, 1998-09-01);During the northern winter monsoon, several large-scale tropical motion systems are active in the southern tropical region of the ITCZ and SPCZ, including the maritime continent, northern Australia and the West Pacific. ...