Adjustment of footprint correction for airborne flux mapping over the FIFE site
- McGill Univ., Sainte-Anne-de-Bellevue (Canada) Inst. for Aerospace Research, Ottawa (Canada) Agriculture Canada, Centre for Land and Biological Resources Research, Ottawa (Canada)
ORA 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. 45 refs.
- Research Organization:
- National Aeronautics and Space Administration, Washington, DC (United States)
- OSTI ID:
- 6336895
- Journal Information:
- Journal of Geophysical Research; (United States), Vol. 97:D17; ISSN 0148-0227
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
DATA
CORRECTIONS
CORRELATIONS
HEAT FLUX
REMOTE SENSING
SOILS
MOISTURE
ADVECTION
AERIAL MONITORING
CONFORMAL MAPPING
TEMPERATURE DISTRIBUTION
INFORMATION
MAPPING
MASS TRANSFER
MONITORING
TOPOLOGICAL MAPPING
TRANSFORMATIONS
540210* - Environment
Terrestrial- Basic Studies- (1990-)