Boundary Layer, Urban Meteorology and Land-Surface Processes

Raman Lidar Observations from the ARM Site in Darwin, Australia: A Water Vapor and Aerosol Climatology

Subashree Mishra
Postdoctoral Research Associate
Cooperative Institute for Mesoscale Meteorological Studies (CIMMS)

15 November 2013, 2:00 PM

National Weather Center, Room 5600
120 David L. Boren Blvd.
University of Oklahoma
Norman, OK

The U.S. Department of Energy’s Atmospheric Radiation Measurement (ARM) Tropical Western Pacific (TWP) site in Darwin, Australia, collects data over a range of different synoptic regimes in the tropics. Funding from the American Recovery and Reinvestment Act enabled the installation of a new Raman Lidar (RL) at the ARM TWP site in Darwin, Australia. It is the only operational RL in the tropics and the only active remote sensing instrument capable of providing simultaneous measurements of water vapor, clouds, and aerosols at the Darwin site. Thus, it provides important climatological information for better characterization of atmospheric conditions around the TWP region.
This study uses 18 months of data from the RL to develop an aerosol and water vapor climatology in the Darwin region. Darwin experiences three distinct climate patterns annually, comprising of 1) a dry continental regime, 2) a wet monsoon season, and 3) a transition period between the dry and wet seasons. The RL observations were separated into different synoptic classes using the technique developed by Evans et al. (2012), and the mean and standard deviation profiles of water vapor mixing ratio and aerosol properties during these three distinct climate regimes will be presented. In addition to this, comparison of RL derived water vapor mixing ratio profiles with profiles derived from radiosondes will be presented. Diurnal differences in the distribution of water vapor and aerosols will also be shown.

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