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Atmospheric Composition

We propose to provide continued monitoring middle atmospheric water vapor from sites of the Network for the Detection of Atmospheric Composition Change (NDACC). We are making continuous measurements of water vapor using 22 GHz radiometers at Mauna Loa, Hawaii, at Lauder, New Zealand, and at Table Mountain, California. The Water Vapor Millimeter-wave Spectrometer (WVMS) instruments have provided the only source of continuous middle atmospheric water vapor measurements from the early 1990s to the present. We propose to continue our efforts to install FFT spectrometers on the WVMS systems. These will improve baseline characterization should make it possible to retrieve water vapor into the lower stratosphere (~25km) while at the same time increasing the stability of measurements at all altitudes. We are presently installing such a spectrometer at Table Mountain, and if this is successful we would install these spectrometers at Lauder and Mauna Loa as part of this proposal. We will also install a new WVMS instrument using hardware funding from the Naval Research Lab, continue to validate water vapor measurements from Aura MLS, conduct a water vapor intercomparison with other ground-based microwave groups, participate in the NASA MOHAVE campaign, develop an improved background temperature dataset, and compare variations with the middle atmospheric water vapor field being developed for the Navy’s forecast model. If this proposal and the proposal for microwave measurements of ozone are successful, then in 2012 we plan to submit a combined ozone/water vapor proposal, with NRL providing both the scientific leadership and the sole engineering support. We will therefore, over these next 4 years, work to develop a common data logging format, and to also slowly merge these teams. We are also working towards a close cooperation with the ClO microwave measurement program, with NRL providing both engineering and scientific support to that program as well.

Project PI: Gerald Nedoluha/Naval Research Laboratory

500 Fifth St. N.W., Washington, D.C. 20001.

Phone: (202) 767-4246

Email: nedoluha@nrl.navy.mil

http://nrc58.nas.edu/aodir/gen_page.asp?mode=detail&sql;=idnumber='893623'

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Started: Aug 09, 2010

Last Activity: Dec 10, 2010

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