Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Impact of field-calibrated vegetation parameters on GCM climate simulations
Autore:
Sen, OL; Bastidas, LA; Shuttleworth, WJ; Yang, ZL; Gupta, HV; Sorooshian, S;
Indirizzi:
Univ Arizona, Dept Hydrol & Water Resources, Tucson, AZ 85721 USA Univ Arizona Tucson AZ USA 85721 & Water Resources, Tucson, AZ 85721 USA
Titolo Testata:
QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY
fascicolo: 574, volume: 127, anno: 2001,
parte:, B
pagine: 1199 - 1223
SICI:
0035-9009(200104)127:574<1199:IOFVPO>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
LAND-SURFACE; MULTICRITERIA METHODS; SPATIAL VARIABILITY; MODEL; DEFORESTATION; SENSITIVITY; SCHEMES; SCALE;
Keywords:
climate modelling; land surface processes; parametrization; soil-vegetation-atmosphere transfer;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Shuttleworth, WJ Univ Arizona, Dept Hydrol & Water Resources, Harshbarger Bldg 11, Tucson, AZ 85721 USA Univ Arizona Harshbarger Bldg 11 Tucson AZ USA 85721 USA
Citazione:
O.L. Sen et al., "Impact of field-calibrated vegetation parameters on GCM climate simulations", Q J R METEO, 127(574), 2001, pp. 1199-1223

Abstract

This paper describes a study in which, for the first time, advanced systems-engineering parameter-estimation techniques were applied to data from several field studies to estimate the preferred set of parameters for some of the most com mon biomes represented in an advanced Soil-Vegetation-Atmosphere Transfer (SVAT) scheme (BATS2, a recent version of the Biosphere-Atmosphere Transfer Scheme): the effect on modelled climate was also investigated. Observational data from field sites in Brazil, Canada, Arizona and Kansas/Oklahoma in the USA, and the Netherlands were chosen as representative of tropical rain forest, coniferous forest. semi-arid vegetation, agricultural crops, and grassland biomes, respectively. Together, these five biomes makeup 50% of the land area represented in BATS. Multi-criteria calibration algorithms do not produce a unique set of model parameters and, when different combinations of the available objective functions at each sire are considered. the number of solutions increases substantially. The need for a single parameter-set for each site (biome) is an important practical issue that was necessarily addressed in this study. A procedure was defined in which optimized parameter-sets were successively discarded by successively applying a cut-off threshold to single observable objective functions following a preference hierarchy. In this study, only the vegetation-related parametersare calibrated for each of the five biomes and implemented into BATS?; however, in a separate experiment, the effect of including soil parameters in the optimization was investigated. When the calibrated parameters are adopted and used in BATS2, there are significant changes between the climates calculated in an eight-year run with version 3 of the Community Climate Modeland in an equivalent right-year run in which the original default parameters were used. The overall conclusion of this exploratory study is that advanced parameter-estimation techniques and appropriate field data can be usedsuccessfully to improve representation of surface exchanges and the modelled climate given by a GCM, by defining appropriate values for vegetation-related parameters in an advanced SVAT scheme.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/12/20 alle ore 21:39:15