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Influence of tropical easterly jet on upper tropical cirrus: An observational study from CALIPSO, Aura-MLS, and NCEP/NCAR data

Das, SK and Chiang, CW and Nee, JB (2011) Influence of tropical easterly jet on upper tropical cirrus: An observational study from CALIPSO, Aura-MLS, and NCEP/NCAR data. Journal of Geophysical Research D: Atmospheres, 116 (12).

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The role of the redistribution of tropical upper tropospheric humidity in the formation of tropical cirrus is studied using three years (June 2006 to December 2008) of observations with the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) instrument onboard the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) as well as the Microwave Limb Sounder (MLS) onboard the Aura satellite. The National Centers for Environmental Prediction and Atmospheric Research reanalysis data are also used. Results show that the redistribution of upper tropospheric humidity from a highly convective zone to the Indian peninsular region leads to the formation of the tropical cirrus. Advection of upper layer humidity is caused by the tropical easterly jet (TEJ) associated with the Asian summer monsoon (ASM). Thus the present analysis brings out, for the first time, the role of the TEJ in the redistribution of upper tropospheric humidity and consequently in the formation of tropical cirrus. As little observational evidence exists in support of the generative mechanisms of the cirrus, the present results can be useful in quantifying the formation process of these clouds, which have implications for Earth's radiation budget and improving global climate models.

Item Type: Article
Additional Information: Copyright of this article belongs to American Geophysical Union.
Uncontrolled Keywords: Asian summer monsoons; Atmospheric research reanalysis; CALIPSO; Cloud-aerosol lidar and infrared pathfinder satellite observations; Cloud-aerosol lidar with orthogonal polarizations; Convective zone; Formation process; Generative mechanism; Global climate model; Microwave limb sounder; National centers for environmental predictions; NCEP/NCAR; Observational study; Radiation budget; Tropical cirrus; Tropical Easterly Jet; Tropical easterly jets; Tropospheric humidity; Upper layer, Atmospheric aerosols; Atmospheric humidity; Climate models; Climatology; Clouds; Earth (planet); Optical radar; Troposphere, Tropics, advection; atmospheric convection; Aura (satellite); CALIPSO; cirrus; climate modeling; data set; easterly wave; global climate; humidity; jet stream; lidar; observational method; radiation budget; satellite data, India
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 27 Oct 2014 10:46
Last Modified: 27 Oct 2014 10:46

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