S.O. Los

Publications (10)33.46 Total impact

• Source

  Available from: psu.edu

  Article: Higher northern latitude normalized difference vegetation index and growing season trends from 1982 to 1999.

  C J Tucker, D A Slayback, J E Pinzon, S O Los, R B Myneni, M G Taylor
  [show abstract] [hide abstract]
  ABSTRACT: Normalized difference vegetation index data from the polar-orbiting National Oceanic and Atmospheric Administration meteorological satellites from 1982 to 1999 show significant variations in photosynthetic activity and growing season length at latitudes above 35 degrees N. Two distinct periods of increasing plant growth are apparent: 1982-1991 and 1992-1999, separated by a reduction from 1991 to 1992 associated with global cooling resulting from the volcanic eruption of Mt. Pinatubo in June 1991. The average May to September normalized difference vegetation index from 45 degrees N to 75 degrees N increased by 9% from 1982 to 1991, decreased by 5% from 1991 to 1992, and increased by 8% from 1992 to 1999. Variations in the normalized difference vegetation index were associated with variations in the start of the growing season of -5.6, +3.9, and -1.7 days respectively, for the three time periods. Our results support surface temperature increases within the same period at higher northern latitudes where temperature limits plant growth.
  International Journal of Bioclimatology Biometeorology 12/2001; 45(4):184-90. · 2.25 Impact Factor
• Article: Biospheric primary production during an ENSO transition.

  M J Behrenfeld, J T Randerson, C R McClain, G C Feldman, S O Los, C J Tucker, P G Falkowski, C B Field, R Frouin, W E Esaias, D D Kolber, N H Pollack
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  ABSTRACT: The Sea-viewing Wide Field-of-view Sensor (SeaWiFS) provides global monthly measurements of both oceanic phytoplankton chlorophyll biomass and light harvesting by land plants. These measurements allowed the comparison of simultaneous ocean and land net primary production (NPP) responses to a major El Niño to La Niña transition. Between September 1997 and August 2000, biospheric NPP varied by 6 petagrams of carbon per year (from 111 to 117 petagrams of carbon per year). Increases in ocean NPP were pronounced in tropical regions where El Niño-Southern Oscillation (ENSO) impacts on upwelling and nutrient availability were greatest. Globally, land NPP did not exhibit a clear ENSO response, although regional changes were substantial.
  Science 04/2001; 291(5513):2594-7. · 31.20 Impact Factor
• Article: Mean and inter-year variation of growing-season normalized difference vegetation index for the Sahel 1981-1989

  C. J. Tucker, W. W. Newcomb, S.O. Los, S. D. Prince
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  ABSTRACT: Images are presented that show the mean and coefficient of variation of nine years (1981-1989) of NOAA AVHRR normalized difference vegetation index (NDVI) data for the growing season (July-October) in Africa, north of the equator. The variation in the growing season NDVI is represented by the coefficient of variation image that shows the large variation in the Sahelian growing season between years. It is concluded that these images illustrate some aspects of the perspective being brought to regional and continental scale processes by coarse resolution satellite sensors and the potential of these sensors to provide consistent, long-term datasets.
  07/1991;
• Article: Teledetection de l'environnement sahelien. Revue de l'etat actuel et des projets futurs

  S. D. Prince, C. O. Justice, S.O. Los
  XF2006306672.
• Article: Satellite estimates of productivity and light use efficiency in United States Agriculture, 1982-1998

  D. B. Lobell, J. A. Hicke, G. P. Asner, C. B. Field, C. J. Tucker, S. O. Los
  Global Change Biology. 8:722-735.
• Source

  Available from: uci.edu

  Article: Satellite-derived increases in net primary productivity across North America 1982-1998

  J. A. Hicke, G. P. Asner, J. T. Randerson, C. J. Tucker, S. O. Los, R. A. Birdsey, J.C. Jenkins, C. Field, E. Holland
  Geophysical Research Letters. 29.
• Article: Interannual variation in global-scale net primary production: Testing model estimates

  C. M. Malmström, M. V. Thompson, G. P. Juday, S. O. Los, J. T. Randerson, C. B. Field
  Global Biogeochemical Cycles. 11:367-392.
• Article: Remote sensing of the Sahelian environment. A review of the current status and future prospects

  S. D. Prince, C. O. Justice, S.O. Los
  XF2006306670.
• Article: A revised land surface parameterization (SiB2) for atmospheric GCMs. Part 3: The greening of the CSU GCM

  D.A. Randall, P. J. Sellers, J. A. Berry, D. A. Dazlich, C. Zhang, G. J Collatz, A. S. Denning, S. O. Los, C. B. Field, I. Fung, C. O. Justice, C. J. Tucker
  Journal of Climate. 9:738-763.
• Article: Biospheric primary production during an ENSO transition

  M.J. Behrenfeld, J.T. Randerson, C.R. McClain, G.C. Feldman, S.O. Los, C.J. Tucker, P.G. Falkowski, C.B. Field, R. Frouin, W.E. Esaias, D.D. Kolber, N.H. Pollack
  Science. 291(5513):2594-2597.