Mapping surface-cover parameters using aggregation rules and remotely sensed cover classes

Altaf M. Arain, W. James Shuttleworth, Z. Liang Yang, Jené Michaud, Johannes Dolman

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

A coupled model, which combines the Biosphere-Atmosphere Transfer Scheme (BATS) with an advanced atmospheric boundary-layer model, is used to validate hypothetical aggregation rules for BATS-specific surface-cover parameters. The model is initialized and tested with observations from the Anglo-Brazilian Amazonian Climate Observational Study and is used to simulate surface fluxes for rain forest and pasture mixes at a site near Manaus in Brazil. The aggregation rules are shown to estimate parameters which give area-average surface fluxes similar to those calculated, with explicit representation of forest and pasture patches for a range of meteorological and surface conditions relevant to this site, but the agreement deteriorates somewhat when there are large patch-to-patch differences in soil moisture. The aggregation rules, validated as above, are then applied to a remotely sensed 1 km land-cover data set to obtain grid-average values of BATS vegetation parameters for 2.8° x 2.8° and 1° x 1° grids within the conterminous United States. There are significant differences in key vegetation parameters (aerodynamic roughness length, albedo, leaf-area index, and stomatal resistance) when aggregate parameters are compared with parameters for the single, dominant cover within the grid. However, the surface energy fluxes calculated by stand-alone BATS with the 2-year forcing data from the International Satellite Land Surface Climatology Programme CD-ROM are reasonably similar using aggregate-vegetation parameters and dominant-cover parameters, but there are some significant differences, particularly in the western USA.

Original languageEnglish (US)
Pages (from-to)2325-2348
Number of pages24
JournalQuarterly Journal of the Royal Meteorological Society
Volume123
Issue number544
StatePublished - Oct 1997

Fingerprint

biosphere
atmosphere
surface flux
vegetation
pasture
parameter
surface energy
energy flux
leaf area index
climatology
aerodynamics
roughness
albedo
land surface
land cover
boundary layer
soil moisture
climate

Keywords

  • Aggregation rules
  • Boundary-layer model
  • Mixed vegetation
  • Surface fluxes

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

Mapping surface-cover parameters using aggregation rules and remotely sensed cover classes. / Arain, Altaf M.; Shuttleworth, W. James; Yang, Z. Liang; Michaud, Jené; Dolman, Johannes.

In: Quarterly Journal of the Royal Meteorological Society, Vol. 123, No. 544, 10.1997, p. 2325-2348.

Research output: Contribution to journalArticle

Arain, Altaf M. ; Shuttleworth, W. James ; Yang, Z. Liang ; Michaud, Jené ; Dolman, Johannes. / Mapping surface-cover parameters using aggregation rules and remotely sensed cover classes. In: Quarterly Journal of the Royal Meteorological Society. 1997 ; Vol. 123, No. 544. pp. 2325-2348.
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