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Adjustment of footprint correction for airborne flux mapping over the FIFE siteA meaningful interpretation of airborne flux estimates over nonuniform terrain must consider local advection from nonhomogeneous source distributions (footprint correction). An empirical procedure for footprint correction of airborne flux data obtained in the First ISLSCP Field Experiment (FIFE) 1989 is presented, based on simple analytical solutions of the diffusion equation which have been adjusted to approximate more realistic solutions. Optimized estimates of surface flux 'maps' derived from airborne observations are then constructed for maximum correlation between flux estimates and independently observed surface characteristics. This paper also includes an analysis of resolution for the given procedure, in terms of amplitude recovery of hypothetical square-wave distributions of surface flux density, and discusses its implications for the interpretation of the optimized estimates of FIFE surface flux maps. Results show that corrected spatial sink distributions are obtained by the current empirical procedure at the cost of considerable reduction in amplitude recovery of small-scale variations in surface flux density. The high spatial correlation observed between corrected flux maps and surface characteristics such as greenness or surface temperature excess is ascribed to the approximately correct positioning of the main flux gradients across the site, which can be expected to have been reproduced with amplitude recovery equal to or greater than 60 percent.
Document ID
19930036588
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Schuepp, P. H.
(McGill Univ. Sainte-Anne-de-Bellevue, Canada)
Macpherson, J. I.
(National Research Council of Canada Inst. for Aerospace Research, Ottawa, United States)
Desjardins, R. L.
(Agriculture Canada Centre for Land and Biological Resources Research, Ottawa, United States)
Date Acquired
August 15, 2013
Publication Date
November 30, 1992
Publication Information
Publication: Journal of Geophysical Research
Volume: 97
Issue: D17
ISSN: 0148-0227
Subject Category
Meteorology And Climatology
Accession Number
93A20585
Distribution Limits
Public
Copyright
Other

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