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Flux Sampling Errors for Aircraft and TowersVarious errors and influences leading to differences between tower- and aircraft-measured fluxes are surveyed. This survey is motivated by reports in the literature that aircraft fluxes are sometimes smaller than tower-measured fluxes. Both tower and aircraft flux errors are larger with surface heterogeneity due to several independent effects. Surface heterogeneity may cause tower flux errors to increase with decreasing wind speed. Techniques to assess flux sampling error are reviewed. Such error estimates suffer various degrees of inapplicability in real geophysical time series due to nonstationarity of tower time series (or inhomogeneity of aircraft data). A new measure for nonstationarity is developed that eliminates assumptions on the form of the nonstationarity inherent in previous methods. When this nonstationarity measure becomes large, the surface energy imbalance increases sharply. Finally, strategies for obtaining adequate flux sampling using repeated aircraft passes and grid patterns are outlined.
Document ID
20000019616
Document Type
Reprint (Version printed in journal)
Authors
Mahrt, Larry
(Oregon State Univ. Corvallis, OR United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1998
Publication Information
Publication: Journal of Atmospheric and Oceanic Technology
Publisher: American Meteorological Society
Volume: 15
Subject Category
Communications And Radar
Report/Patent Number
ARO-34983.6-EV
AD-A370038
Funding Number(s)
CONTRACT_GRANT: NAG5-2300
CONTRACT_GRANT: NSF ATM-93-10576
CONTRACT_GRANT: DAAH04-96-1-0037
Distribution Limits
Public
Copyright
Other

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