Temporal coverage: 13 April 2015 - present
The Soil Moisture Active Passive (SMAP) “Heterotrophic Respiration (L4, 9 km Grid Cell Mean, Model Value-Added)” layer displays model-derived global daily heterotrophic respiration in grams of carbon uptake per meter squared per day ( gC m-2 day-1) posted on a 9 km EASE-Grid 2.0. Heterotrophic respiration is computed as the sum of variable decomposition and respiration rates from metabolic, structural, and recalcitrant Soil Organic Carbon (SOC) pools and corresponding decomposition rate parameters. The metabolic and structural SOC pools represent plant litter with relatively short (e.g., ≤ 5 years) turnover periods, while the recalcitrant pool represents more physically and chemically protected SOC with a longer turnover time.
The SMAP spacecraft carries two instruments, a radar (active) and a radiometer (passive), that together make global measurements of land surface soil moisture and freeze/thaw state. It is useful for monitoring and predicting natural hazards such as floods and droughts, understanding the linkages between Earth’s water, energy and carbon cycles, and reducing uncertainties in predicting weather and climate.
References: SMAP L4 Global Daily 9 km Carbon Net Ecosystem Exchange
Data field: rh_mean