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Atmospheric Composition

The purpose of the proposed work is to maintain and improve our readiness for deployment of instruments on the NASA WB-57F (and, potentially, DC-8) during the TC4-Guam campaign at some uncertain date in the future. This will consist of modest improvements to the 2-channel instrument (NO and NOy) flown on the WB-57F in TC4-Costa Rica (and, potentially, the 4-channel instrument -- NO, NO2, NOy, O3 -- flown on the DC-8 in ARCTAS), as well as replenishment of calibration gases and standards. Our experience during these two recent campaigns has pointed the way toward modifications that can improve and maintain the quality of the measurements. Although the 2-channel instrument did not function properly on the WB-57F during TC4-Costa Rica, it has since flown successfully on the NSF/NCAR GV in START08/pre-HIPPO. During TC4-Costa Rica, valuable engineering data were obtained that indicate needed modifications for the purpose of improved temperature control for operation in a WB-57F pallet, so that instrument performance can be maintained at a high level. Other, more minor improvements are also planned to facilitate instrument maintenance in the field. These measurements are central to an understanding of the mechanisms that control ozone in the TTL and assessing the role of lightning-produced NOx in this chemistry. Additionally, the measurements provide a tracer of convective outflows in support of other studies and are useful in the validation of column measurements of NO2.

Project PI: Andrew Weinheimer/National Center for Atmospheric Research

PO Box 3000, Boulder, CO 80307-3000 Office: FL0-1142

Phone: (303)497-1444

Email: wein@ucar.edu

http://www.nar.ucar.edu/2008/ESSL/catalog/tiimes/weinheimer.php

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Started: Aug 09, 2010

Last Activity: Dec 10, 2010

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