Abstract
Accumulation and renewal of organic matter as quantified through net primary productivity (NPP) is considered a very major function of the biosphere, and its estimation is crucial in understanding the carbon cycle. A physically-based model relating NPP to the difference of vertically and horizontally polarized brightness temperatures ( ΔT) observed at 37 GHz frequency of the scanning multichannel microwave radiometer (SMMR) on-board the Nimbus-7 satellite is used for fitting areally averaged values of NPP and ΔT for five biomes. The land-surface NPP within 80°N to 55°S is then calculated using the ΔT data and compared with other estimates.
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