A Look at Amazon Basin Seasonal Dynamics with the Biophysical ...
22.08.2015 • Views
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A Look at Amazon Basin Seasonal Dynamics with the Biophysical ...

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Poster title: Global teleconnections of clim<strong>at</strong>e to regional model estim<strong>at</strong>es of<strong>Amazon</strong> ecosystem carbon fluxes.Authors:Christopher Potter, NASA Ames Research CenterSteven Klooster, California St<strong>at</strong>e University Monterey BayVipin Kumar, University of MinnesotaRanga Myneni, Boston UniversityAbstract:Our LBA-ECO research team is investig<strong>at</strong>ing global teleconnections of oceanclim<strong>at</strong>e to regional s<strong>at</strong>ellite-driven observ<strong>at</strong>ions for <strong>Amazon</strong> ecosystemproduction, mainly in <strong>the</strong> form of monthly predictions of net carbon exchangeover <strong>the</strong> period 1982-1999 from <strong>the</strong> NASA-CASA (Carnegie-Ames-Stanford) Biospheremodel. This model is driven by observed surface clim<strong>at</strong>e and monthly estim<strong>at</strong>esof veget<strong>at</strong>ion leaf area index (LAI) and fraction of absorbed PAR (FPAR)gener<strong>at</strong>ed <strong>at</strong> 0.5 degree sp<strong>at</strong>ial resolution from <strong>the</strong> NOAA s<strong>at</strong>ellite Advanced VeryHigh Resolution Radiometer (AVHRR). Land surface AVHRR d<strong>at</strong>a processing usingmodified MODIS (Moder<strong>at</strong>e-resolution Imaging Spectroradiometer) radi<strong>at</strong>ivetransfer algorithms includes improved calibr<strong>at</strong>ion for intra- and inter-sensorvari<strong>at</strong>ions, partial <strong>at</strong>mospheric correction for gaseous absorption andsc<strong>at</strong>tering, and correction for str<strong>at</strong>ospheric aerosol effects associ<strong>at</strong>ed <strong>with</strong>volcanic eruptions. .Results from our analysis suggest th<strong>at</strong> anomalies of netprimary production (NPP) and net ecosystem production (NEP) predicted from <strong>the</strong>NASA-CASA model over large areas of <strong>the</strong> <strong>Amazon</strong> region west of 60 degreeslongitude are strongly (and neg<strong>at</strong>ively) correl<strong>at</strong>ed <strong>with</strong> <strong>the</strong> Sou<strong>the</strong>rn Oscill<strong>at</strong>ionIndex (SOI), whereas NPP and NEP anomalies over large areas of <strong>the</strong> region eastof 60 degrees longitude are strongly (and positively) correl<strong>at</strong>ed <strong>with</strong> SOI.Certain areas of <strong>the</strong> region appear to have strong linkages of <strong>the</strong> NASA-CASA NPPanomaly record to <strong>the</strong> North Atlantic Oscill<strong>at</strong>ion (NAO) index. Geophysicalprocesses are investig<strong>at</strong>ed for <strong>the</strong>se global teleconnections of ocean clim<strong>at</strong>e to<strong>Amazon</strong> ecosystem carbon fluxes and land surface clim<strong>at</strong>e.

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