Gross Primary Productivity

NASAs new Moderate Resolution Imaging Spectroradiometer (MODIS) allows scientists to gauge our planets metabolism on an almost daily basis. GPP, gross primary production, is the technical term for plant photosynthesis. This composite image over the continental United States, acquired during the period March 26 - April 10, 2000, shows regions where plants were more or less productive–i.e., where they inhaled carbon dioxide and then used the carbon from photosynthesis to build new plant structures. This false-color image provides a map of how much carbon was absorbed out of the atmosphere and fixed within land vegetation. Areas colored blue show where plants used as much as 60 grams of carbon per square meter. Areas colored green and yellow indicate a range of anywhere from 40 to 20 grams of carbon absorbed per square meter. Red pixels show an absorption of less than 10 grams of carbon per square meter and white pixels (often areas covered by snow or masked as urban) show little or no absorption. This is one of a number of new measurements that MODIS provides to help scientists understand how the Earths landscapes are changing over time. Scientists goal is use of these GPP measurements to refine computer models to simulate how the land biosphere influences the natural cycles of water, carbon, and energy throughout the Earth system. The GPP will be an integral part of global carbon cycle source and sink analysis, an important aspect of Kyoto Protocol assessments. (MODIS Product: MOD17; Product Level: 4; MODIS Data Type: MODIS-PFM)
Source: Steven Running, University of Montana - NTSG

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