Ensemble Ecosystem Model Experiment and Intercomparison using the Terrestrial Observation and Prediction System (TOPS) Weile Wang, Jennifer L. Dungan,

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Presentation transcript:

Ensemble Ecosystem Model Experiment and Intercomparison using the Terrestrial Observation and Prediction System (TOPS) Weile Wang, Jennifer L. Dungan, Andrew Michaelis, Hirofumi Hashimoto, Ichii Kazuhito, Ramakrishna Nemani

Ecosystem Models Name Genre GPP NPP NEE/HR Spin-up Reference Biome_BGC Prog. Far-quhar GPP – AR NPP – HR; HR estimated from soil pools; Until equilibrium is reached Thornton, et al. (2002) LPJ 1000 climate years Sitch et al. (2003) CASA Diag. 2*NPP LUE 2000 climate years Potter et al. (1993) Flex-BGC 0.5*GPP NPP-HR; HR estimated from base rate N/A Nemani et al. (in press) Models are run for the NACP domain at 8km grids for the period 1982-2006 using the Terrestrial Observation and Prediction System (TOPS) Standard model outputs include GPP, NPP, NEE, ET, and soil moisture

Model inputs Climate Data : Daily maximum/minimum temperature and precipitation extrapolated from the NCDC Cooperative Summary of the Day data (TD3200) for the period 1982-2006; Dew-point temperatures, vapor pressure deficit, and incident solar radiation generated based on algorithms described in Campbell and Norman (1998) and Jolly et al. (2005); Satellite Data: AVHRR/MODIS monthly LAI/FPAR (1982-2006); MODIS 12Q1 land cover map; Soil Data: Soil texture and effective depth from ECOCLIMAP (Masson et al., 2003).

Temperature-Precipitation Space Carbon Fluxes in T-P Space Carbon Fluxes (GPP, NPP, and NEE) Temperature

Results: GPP FLEX-BGC

Results: NPP FLEX-BGC

Results: NEE FLEX-BGC

Conclusions Annual total NPP for North America is estimated to be ~4.4-6.7 PgC/yr and the overall NPP/GPP ratio of both BGC and LPJ is about 0.50 Patterns of NPP generally follow those of GPP (BGC and LPJ), however, remarkable differences are found in some regions (e.g., LPJ) Substantial diversity is shown in NEE results: BGC and CASA are essentially carbon neutral; the total NEE estimated by LPJ and Flex-BGC is 0.47 PgC/yr and 1.29 PgC/yr, respectively (positive values indicate carbon sink)