MODIS Global Terrestrial Primary Production Variations and Trend over the Last Decade
Maosheng
Zhao, Numerical Terradynamic Simulation Group, University of Montana., zhao@ntsg.umt.edu
(Presenting)
Steven
Running, Numerical Terradynamic Simulation Group, University of Montana., swr@ntsg.umt.edu
With the availability of the Collection5 MODIS FPAR/LAI, we generated the improved Collection5.1 (C5.1) MODIS GPP and NPP, which have filled data gaps in FPAR/LAI caused by unfavorable atmospheric contaminations mainly from cloudiness. Due to the limitation of the availability of consistent daily meteorological data driver, GMAO/NASA, the official improved C5.1 MODIS GPP and NPP (GPP/NPP-GMAO) are limited to the period 2000 to 2006. To cover the entire MODIS data period from 2000 to 2009, we used NCEP meteorological reanalysis (NCEP) to drive our MODIS GPP/NPP algorithm. Both global NPP by GMAO and by NCEP have significantly negative correlation with annual CO2 growth rate, confirming and implying that terrestrial primary production is the major driver of annual CO2 growth rate. From 2000 to 2009, terrestrial NPP reduced; NPP in North Hemisphere (NH) continues increasing, while NPP in South Hemisphere (SH) decreased, counteracting the increasing NPP over NH. A drying trend in SH is responsible for its reduced NPP.
Presentation Type: Poster
Poster Session: Carbon Cycle Science
NASA TE Funded Awards Represented:
Running, Steven
Validation, improvement and applications of MODIS global terrestrial primary production MOD 17 and a test MODIS evapotranspiration product: Green Compute Cluster