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Titolo:
EVALUATION OF FOREST CANOPY MODELS FOR ESTIMATING ISOPRENE EMISSIONS
Autore:
LAMB B; PIERCE T; BALDOCCHI D; ALLWINE E; DILTS S; WESTBERG H; GERON C; GUENTHER A; KLINGER L; HARLEY P; ZIMMERMAN P;
Indirizzi:
WASHINGTON STATE UNIV,DEPT CIVIL & ENVIRONM ENGN,LAB ATMOSPHER RES PULLMAN WA 99164 US EPA RES TRIANGLE PK NC 00000 NOAA,ATMOPHER TURBULENCE & DIFFUS DIV OAK RIDGE TN 00000 NATL CTR ATMOSPHER RES,DIV ATMOSPHER CHEM BOULDER CO 80307
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
fascicolo: D17, volume: 101, anno: 1996,
pagine: 22787 - 22797
Fonte:
ISI
Lingua:
ENG
Soggetto:
INVENTORY; FLUXES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
14
Recensione:
Indirizzi per estratti:
Citazione:
B. Lamb et al., "EVALUATION OF FOREST CANOPY MODELS FOR ESTIMATING ISOPRENE EMISSIONS", JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 101(D17), 1996, pp. 22787-22797

Abstract

During the summer of 1992, isoprene emissions were measured in a mixed deciduous forest near Oak Ridge, Tennessee. Measurements were aimed at the experimental scale-up of emissions from the leaf level to the forest canopy to the mixed layer. Results from the scale-up study are compared to different canopy models for determining the leaf microclimate as input to isoprene emission algorithms. These include (1) no canopy effects, (2) a simple vertical scaling canopy model with a leaf energy balance, and (3) a numerical canopy model which accounts for leaf-sun geometries, photosynthesis, respiration, transpiration, and gas transport in the canopy. Initial evaluation of the models was based upona standard emission rate factor of 90 mu gC g(-1) hr(-1) (0.42 nmol g(-1) s(-1)) taken from leaf cuvette measurements and a biomass densityfactor of 203 g m(-2) taken from biomass surveys and a flux footprintanalysis. The results indicated that predicted fluxes were consistentamong the models to within approximately +/-20%, but that the models overestimated the mean flux by about a factor of 2 and overestimated the maximum observed flux by 30 to 50%. Adjusting the standard emissionfactor and biomass density each downward by 20% yielded predicted means approximately 20% greater than the observed means and predicted maxima approximately 25%, less than the observed maxima. Accounting for changes in biomass density as a function of direction upwind of the tower improved the overall model performance.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 08/07/20 alle ore 06:16:22