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Lidar investigation of tropical nocturnal boundary layer aerosols and cloud macrophysics

Manoj, MG and Devara, PCS and Taraphdar, S (2013) Lidar investigation of tropical nocturnal boundary layer aerosols and cloud macrophysics. Atmospheric Research, 132-13. pp. 65-75.

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Abstract

Observational evidence of two-way association between nocturnal boundary layer aerosols and cloud macrophysical properties over a tropical urban site is reported in this paper. The study has been conducted during 2008-09 employing a high space-time resolution polarimetric micro-pulse lidar over a tropical urban station in India. Firstly, the study highlights the crucial role of boundary layer aerosols and background meteorology on the formation and structure of low-level stratiform clouds in the backdrop of different atmospheric stability conditions. Turbulent mixing induced by the wind shear at the station, which is associated with a complex terrain, is found to play a pivotal role in the formation and structural evolution of nocturnal boundary layer clouds. Secondly, it is shown that the trapping of energy in the form of outgoing terrestrial radiation by the overlying low-level clouds can enhance the aerosol mixing height associated with the nocturnal boundary layer. To substantiate this, the long-wave heating associated with cloud capping has been quantitatively estimated in an indirect way by employing an Advanced Research Weather Research and Forecasting (WRF-ARW) model developed by National Center for Atmospheric Research (NCAR), Colorado, USA, and supplementary data sets; and differentiated against other heating mechanisms. The present investigation as well establishes the potential of lidar remote-sensing technique in exploring some of the intriguing aspects of the cloud-environment relationship.

Item Type: Article
Additional Information: Copyrights of this article belongs to Elsevier.
Uncontrolled Keywords: Atmospheric stability; Low-level stratiform clouds; National center for atmospheric researches; Nocturnal boundary layers; Regional climate; Structural evolution; Terrestrial radiation; Weather research and forecasting, Aerosols; Atmospheric aerosols; Atmospheric structure; Climatology; Clouds; Infrared radiation; Optical radar; Research; Sensors; Tropics, Weather forecasting, aerosol; cloud microphysics; lidar; nocturnal boundary layer; polarization; regional climate; remote sensing; stratiform cloud; tropical region; turbulent mixing, India
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 20 Jun 2014 06:24
Last Modified: 20 Jun 2014 06:24
URI: http://moeseprints.incois.gov.in/id/eprint/280

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