Global net primary production and heterotrophic respiration for 1987

Journal Article · Thu Jun 01 00:00:00 EDT 1995 · Bulletin of the Ecological Society of America

OSTI ID:95810

Hunt, Jr, R E; Piper, S C; Nemani, R ^[1]

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1. Univ. of Montana, Missoula, MT (United States)

An ecosystem process model, BIOME-BGC, was parameterized and used to simulate the actual net primary production and heterotrophic respiration using daily climatic data, land cover type, leaf area index gridded to 1{degree} latitude by 1{degree} longitude grid cells for the year 1987. Global net primary production was 52 Pg C. These estimates were validated directly by two different methods. First, the grid cells were aggregated and used as inputs to a 3D atmospheric transport model, to compare CO{sub 2} station data with predictions. We simulated the intra-annual variation of atmospheric CO{sub 2} well for the northern hemisphere, but not for the southern hemisphere. Second, we calculated the net {sup 13}C uptake of vegetation, which is a function of water use efficiency. The {sup 13}C/{sup 12}C ratios agreed with measured data, indicating a strong limitation of global primary processes by the hydrologic cycle, especially precipitation. These are different from other global carbon models as we can simulate the year-to-year variation of climate, including El Nino, on the global carbon cycle.

• OSTI ID: 95810
• Report Number(s): CONF-9507129-; ISSN 0012-9623; TRN: 95:004728-0075
• Journal Information: Bulletin of the Ecological Society of America, Vol. 76, Issue 2; Conference: 80. anniversary of the transdisciplinary nature of ecology, Snowbird, UT (United States), 30 Jul - 3 Aug 1995; Other Information: PBD: Jun 1995
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
56 BIOLOGY AND MEDICINE
APPLIED STUDIES
99 MATHEMATICS
COMPUTERS
INFORMATION SCIENCE
MANAGEMENT
LAW
MISCELLANEOUS
CARBON DIOXIDE
SEASONAL VARIATIONS
CARBON CYCLE
GLOBAL ASPECTS
ECOSYSTEMS
CLIMATE MODELS
PHENOLOGY
GROUND COVER
UPTAKE
WATER USE
NORTHERN HEMISPHERE
SOUTHERN HEMISPHERE