An approach for simulating the phenology of savanna ecosystems in the Laboratoire de Météorologie Dynamique general circulation model
Identifieur interne : 006299 ( PascalFrancis/Corpus ); précédent : 006298; suivant : 006300An approach for simulating the phenology of savanna ecosystems in the Laboratoire de Météorologie Dynamique general circulation model
Auteurs : C. Ciret ; J. Polcher ; X. Le RouxSource :
- Global biogeochemical cycles [ 0886-6236 ] ; 1999.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
Abstract
Plant phenology, defined here as the seasonal variations of green and dead biomasses in response to climatic conditions, is an important parameter for the modeling of biophysical exchanges between vegetation and atmosphere. However, the adequate simulation of plant phenology, particularly in tropical regions, is still lacking in current general circulation models (GCMs). This paper proposes a modeling approach to simulate the phenology of savanna grasses in the Laboratoire de Météorologie Dynamique (LMD) GCM. A plant production and phenology model (PPP) is developed to simulate the temporal variations of green and dead aboveground biomasses and leaf area index (LAI) using climate variables computed by the LMD GCM. In addition, the PPP model simulates the occurrence of savanna fire. Predictions are compared to harvest measurements of grasses from two different regions of savanna: the region of Lamto, West Africa, and the region of Victoria River district, northern Australia. Results show that the PPP model generates reasonably realistic plant seasonal variations in these two regions, despite the existing biases in the simulated climate variables. Both the frequency and timing of fire occurrence are, moreover, realistically simulated. This model, linked to the GCM, could be used as a tool to investigate the effects of fire disturbances and short-term (i.e., seasonal and interannual) savanna vegetation feedbacks on climate.
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NO : | PASCAL 99-0378276 INIST |
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ET : | An approach for simulating the phenology of savanna ecosystems in the Laboratoire de Météorologie Dynamique general circulation model |
AU : | CIRET (C.); POLCHER (J.); LE ROUX (X.) |
AF : | Climatic Impact Centre, Macquarie University/Sydney, New South Wales/Australie (1 aut.); Laboratoire de Météorologie Dynamique, CNRS/Paris/France (2 aut.); Institut Nationale de Recherche Agronomique/Clermont Ferrand/France (3 aut.) |
DT : | Publication en série; Niveau analytique |
SO : | Global biogeochemical cycles; ISSN 0886-6236; Coden GBCYEP; Etats-Unis; Da. 1999; Vol. 13; No. 2; Pp. 603-621; Bibl. 2 p. |
LA : | Anglais |
EA : | Plant phenology, defined here as the seasonal variations of green and dead biomasses in response to climatic conditions, is an important parameter for the modeling of biophysical exchanges between vegetation and atmosphere. However, the adequate simulation of plant phenology, particularly in tropical regions, is still lacking in current general circulation models (GCMs). This paper proposes a modeling approach to simulate the phenology of savanna grasses in the Laboratoire de Météorologie Dynamique (LMD) GCM. A plant production and phenology model (PPP) is developed to simulate the temporal variations of green and dead aboveground biomasses and leaf area index (LAI) using climate variables computed by the LMD GCM. In addition, the PPP model simulates the occurrence of savanna fire. Predictions are compared to harvest measurements of grasses from two different regions of savanna: the region of Lamto, West Africa, and the region of Victoria River district, northern Australia. Results show that the PPP model generates reasonably realistic plant seasonal variations in these two regions, despite the existing biases in the simulated climate variables. Both the frequency and timing of fire occurrence are, moreover, realistically simulated. This model, linked to the GCM, could be used as a tool to investigate the effects of fire disturbances and short-term (i.e., seasonal and interannual) savanna vegetation feedbacks on climate. |
CC : | 002A14B04B |
FD : | Production végétale; Développement; Biomasse; Climat; Savane; Zone tropicale; Modèle; Application; Feu végétation; Végétation; Afrique Ouest; Australie; Variation saisonnière; Relation plante atmosphère |
FG : | Afrique; Océanie |
ED : | Plant production; Development; Biomass; Climate; Savannah; Tropical zone; Models; Application; Canopy fire; Vegetation; West Africa; Australia; Seasonal variation; Plant atmosphere relation |
EG : | Africa; Oceania |
SD : | Produccíon vegetal; Desarrollo; Biomasa; Clima; Sabana; Zona tropical; Modelo; Aplicación; Fuego vegetación; Vegetación; Africa occidental; Australia; Variación estacional |
LO : | INIST-21109.354000085808890210 |
ID : | 99-0378276 |
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<front><div type="abstract" xml:lang="en">Plant phenology, defined here as the seasonal variations of green and dead biomasses in response to climatic conditions, is an important parameter for the modeling of biophysical exchanges between vegetation and atmosphere. However, the adequate simulation of plant phenology, particularly in tropical regions, is still lacking in current general circulation models (GCMs). This paper proposes a modeling approach to simulate the phenology of savanna grasses in the Laboratoire de Météorologie Dynamique (LMD) GCM. A plant production and phenology model (PPP) is developed to simulate the temporal variations of green and dead aboveground biomasses and leaf area index (LAI) using climate variables computed by the LMD GCM. In addition, the PPP model simulates the occurrence of savanna fire. Predictions are compared to harvest measurements of grasses from two different regions of savanna: the region of Lamto, West Africa, and the region of Victoria River district, northern Australia. Results show that the PPP model generates reasonably realistic plant seasonal variations in these two regions, despite the existing biases in the simulated climate variables. Both the frequency and timing of fire occurrence are, moreover, realistically simulated. This model, linked to the GCM, could be used as a tool to investigate the effects of fire disturbances and short-term (i.e., seasonal and interannual) savanna vegetation feedbacks on climate.</div>
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<ET>An approach for simulating the phenology of savanna ecosystems in the Laboratoire de Météorologie Dynamique general circulation model</ET>
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<EA>Plant phenology, defined here as the seasonal variations of green and dead biomasses in response to climatic conditions, is an important parameter for the modeling of biophysical exchanges between vegetation and atmosphere. However, the adequate simulation of plant phenology, particularly in tropical regions, is still lacking in current general circulation models (GCMs). This paper proposes a modeling approach to simulate the phenology of savanna grasses in the Laboratoire de Météorologie Dynamique (LMD) GCM. A plant production and phenology model (PPP) is developed to simulate the temporal variations of green and dead aboveground biomasses and leaf area index (LAI) using climate variables computed by the LMD GCM. In addition, the PPP model simulates the occurrence of savanna fire. Predictions are compared to harvest measurements of grasses from two different regions of savanna: the region of Lamto, West Africa, and the region of Victoria River district, northern Australia. Results show that the PPP model generates reasonably realistic plant seasonal variations in these two regions, despite the existing biases in the simulated climate variables. Both the frequency and timing of fire occurrence are, moreover, realistically simulated. This model, linked to the GCM, could be used as a tool to investigate the effects of fire disturbances and short-term (i.e., seasonal and interannual) savanna vegetation feedbacks on climate.</EA>
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