87th AMS Annual Meeting

Wednesday, 17 January 2007
Ozonesonde Campaign 2005 & 2006
Exhibit Hall C (Henry B. Gonzalez Convention Center)
Michael Woodman, Maryland Dept. of the Environment, Baltimore, MD; and D. Nguyen, D. Krask, M. Seybold, E. Joseph, V. Davis, R. M. Hoff, and R. Rogers
The Maryland Department of the Environment (MDE) Air Quality Monitoring Program sponsored an ozonesonde measurement campaign for the summers of 2005 and 2006. MDE prepared the scope of work and designed the measurement campaign products and schedule to be used in a contract with Howard University's Physics Department at their laboratory in Beltsville, Maryland. The scope of work called for up to 30 ozonesonde launches to occur 3 times per day (pre-dawn, mid-late afternoon, and early evening) during 10 ozone episode days. The decision of which days to launch on was determined by MDE meteorologists with input from other Mid-Atlantic air quality forecasters. The goals of the campaign were three-fold: The primary goal was to collect ozone profiles to capture residual layer transport of ozone via the predominant westerly wind direction and the nocturnal low-level jet. Secondly, the transport measurements would be evaluated to provide insight to interstate pollutant transport and equitable interstate control strategies. Finally, the ozonesonde launches would be rolled into the MDE daily air quality forecasting and outreach program. This was to be accomplished by posting the ozone profile graphic to MDE's Air Watch web site (http://air-watch.net/) where real time air quality data is displayed. A total of 22 ozonesonde launches occurred between July 18 and August 25, 2005. There were 10 morning launches (between 06-11 AM), 9 afternoon launches (between noon 6 PM), and 3 night launches (between 7 5 PM-AM respectively). Subsequent data from launches during the summer of 2006 are currently being compiled. Preliminary results show evidence of large-scale residual layer transport and the occurrence of a nocturnal low level jet as detected by ozonesonde measurements, which appears to verify with the MDE boundary layer wind profiler at Beltsville, Maryland and the LIDAR located in Catonsville, Maryland at the University of Maryland at Baltimore County. One important goal of future ozonesonde campaigns will be to prepare and follow a scope of work that incorporates a routine ozonesonde launch schedule for capturing ozone profile fluctuations as a function of daily boundary layer evolution. These ozone profiles will also be more readily available for real-time distribution to the public via the web.

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