Whats new with MODIS NPP and GPP MODIS/VIIRS Science Team Meeting May 20, 2015 Steven W. Running Numerical Terradynamic Simulation Group College of Forestry.

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Presentation transcript:

Whats new with MODIS NPP and GPP MODIS/VIIRS Science Team Meeting May 20, 2015 Steven W. Running Numerical Terradynamic Simulation Group College of Forestry and Conservation University of Montana

GLOBAL NPP TREND

From 2000 – ,000 new wells / year 3 million ha land lost 4.5 Tg C of NPP lost / yr

NPP driven carbon sink (Poulter et al 2014) For example, in Australia: 45% increase in NPP (LPJ and MODIS) 9% increase in Rh (LPJ) 29% decrease in fire emissions from GFED & GFAS observations Net effect 0.84 Pg C sink in Australia Explained 60% of global anomaly Semi arid regions explained 51% of total land sink in 2011 Climate attribution -Precipitation driven -Regional lag effects -Enhanced soil moisture from 2010 precipitation in semi-arid regions -Decrease in tropical Rh after 2010 drought

Croplands show largest LUE opt variability. MOD17 LUE max < LUE opt for CRO, GRA, DBF MOD17 LUE max > LUE opt for CSH. Aggregating LUE opt variability within coarse plant functional type (PFT) classes leads to large model LUE and GPP error. Spatially explicit estimation of optimal light use efficiency for improved satellite data driven ecosystem productivity modeling. Nima Madani, John S. Kimball, Steve W. Running. AGU 2014 Spatial variability in LUE opt

Traits Topogra phy Soil water Crop areas Percent cover 45 Tower Training sites 17 Tower Testing sites LUE opt

Global Annual 1-km ET over Global average MODIS ET over vegetated land surface is ± mm yr -1.

MOD 16/17 with 1km daily meteorology, with USGS

Net Primary Productivity Indicator > 80 gC m 2 yr -1 > 40 gC m 2 yr -1 > 0 gC m 2 yr -1 < 0 gC m 2 yr -1 < -40 gC m 2 yr -1 < -80 gC m 2 yr -1 NPP (gC/m 2 ) Percentage of area above or below the 13-year NPP average