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contributor authorKuznetsova, Daria
contributor authorDauhut, Thibaut
contributor authorChaboureau, Jean-Pierre
date accessioned2019-09-22T09:03:36Z
date available2019-09-22T09:03:36Z
date copyright12/21/2018 12:00:00 AM
date issued2018
identifier otherJAS-D-18-0188.1.pdf
identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4262619
description abstractThe passage of the Madden?Julian oscillation (MJO) over the Indian Ocean and the Maritime Continent is investigated during the episode of 23?30 November 2011. A Meso-NH convection-permitting simulation with a horizontal grid spacing of 4 km is examined. The simulation reproduces the MJO signal correctly, showing the eastward propagation of the primary rain activity. The atmospheric overturning is analyzed using the isentropic method, which separates the ascending air with high equivalent potential temperature from the subsiding air with low equivalent potential temperature. Three key circulations are found. The first two circulations are a tropospheric deep circulation spanning from the surface to an altitude of 14 km and an overshoot circulation within the tropical tropopause layer. As expected for circulations associated with deep convection, their intensities, as well as their diabatic tendencies, increase during the active phase of the MJO, while their entrainment rates decrease. The third circulation is characterized by a rising of air with low equivalent potential temperature in the lower free troposphere. The intensity of the circulation, as well as its depth, varies with the MJO activity. During the suppressed phase, this circulation is associated with a dry air intrusion from the subtropical region into the tropical band and shows a strong drying of the lower to middle troposphere.
publisherAmerican Meteorological Society
titleThe Three Atmospheric Circulations over the Indian Ocean and the Maritime Continent and Their Modulation by the Passage of the MJO
typeJournal Paper
journal volume76
journal issue2
journal titleJournal of the Atmospheric Sciences
identifier doi10.1175/JAS-D-18-0188.1
journal fristpage517
journal lastpage531
treeJournal of the Atmospheric Sciences:;2018:;volume 076:;issue 002
contenttypeFulltext


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