Index Catalog // ScholarsArchive@OSU

Creator:: Hilker, Thomas, Lyapustin, Alexei I., Tucker, Compton J., Sellers, Piers J., Hall, Forrest G., and Wang, Yujie
Abstract:: Tropical rainforests are significant contributors to the global cycles of energy, water and carbon. As a result, monitoring of the vegetation status over regions such as Amazônia has been a long standing interest of Earth scientists trying to determine the effect of climate change and anthropogenic disturbance on the tropical...
Resource Type:: Article
Full Text:: . Sellers a, Forrest G. Hall a,b, Yujie Wang a,b a Oregon State University, College of Forestry, Corvallis

Creator:: Hilker, Thomas, Hall, Forrest G., Coops, Nicholas C., Collatz, James G., Black, T. Andrew, Tucker, Compton J., Sellers, Piers J., and Grant, Nicholas
Abstract:: Surface energy balance is a major determinant of land surface temperature and the Earth's climate. To date, there is no approach that can produce effective, physically consistent, global and multi-decadal energy–water flux data over land. Net radiation (R[subscript n]) can be quantified regionally using satellite retrievals of surface reflectance and...
Resource Type:: Article
Full Text:: sensing of transpiration and heat fluxes using multi-angle observations Thomas Hilker a,⁎, Forrest G. Hall

Creator:: Wulder, Michael A., Hilker, Thomas, White, Joanne C., Coops, Nicholas C., Masek, Jeffrey G., Pflugmacher, Dirk, and Crevier, Yves
Abstract:: Free and open access to satellite imagery and value-added data products have revolutionized the role of remote sensing in Earth system science. Nonetheless, rapid changes in the global environment pose challenges to the science community that are increasingly difficult to address using data from single satellite sensors or platforms due...
Resource Type:: Article
Full Text:: ., Coops, N. C., Masek, J. G., Pflugmacher, D., & Crevier, Y. (2015). Virtual constellations for global

Creator:: Hilker, Thomas, Lyapustin, Alexei I., Hall, Forrest G., Myneni, Ranga, Knyazikhin, Yuri, Wang, Yujie, Tucker, Compton J., and Sellers, Piers J.
Abstract:: The Amazon rainforest is a critical hotspot for bio-diversity, and plays an essential role in global carbon, water and energy fluxes and the earth's climate. Our ability to project the role of vegetation carbon feedbacks on future climate critically depends upon our understanding of this tropical ecosystem, its tolerance to...
Resource Type:: Article
Full Text:: , A. I., Hall, F. G., Myneni, R., Knyazikhin, Y., Wang, Y., ... & Sellers, P. J. (2015). On the

Creator:: Hilker, Thomas, Hall, Forrest G., Coops, Nicholas C., Black, Andrew T., Jassal, Rachhpal, Mathys, Amanda, and Grant, Nicholas
Abstract:: Vegetation carbon uptake and respiration constitute the largest carbon cycle of the planet with an annual turnover in the order of 120 GT. Currently, neither ecosystem carbon uptake (through photosynthesis) nor ecosystem carbon release (through respiration) can be measured directly during the daytime. Instead, flux-tower measurements rely on nighttime respiration...
Resource Type:: Article
Full Text:: sensing and carbon flux measurements Hilker, T., Hall, F. G., Coops, N. C., Black, A. T., Jassal, R

Creator:: Hilker, Thomas, Lyapustin, Alexei I., Tucker, Compton J., Hall, Forrest G., Myneni, Ranga B., Wang, Yujie, Bi, Jian, Mendes de Moura, Yhasmin, and Sellers, Piers J.
Abstract:: We show that the vegetation canopy of the Amazon rainforest is highly sensitive to changes in precipitation patterns and that reduction in rainfall since 2000 has diminished vegetation greenness across large parts of Amazonia. Large-scale directional declines in vegetation greenness may indicate decreases in carbon uptake and substantial changes in...
Resource Type:: Article
Full Text:: , F. G., Myneni, R. B., Wang, Y., ... & Sellers, P. J. (2014). Vegetation dynamics and rainfall

Creator:: Lyapustin, Alexei I., Wang, Yujie, Laszlo, Istvan, Hilker, Thomas, Hall, Forrest G., Sellers, Piers J., Tucker, Compton J., and Korkin, Sergey V.
Abstract:: This paper describes the atmospheric correction (AC) component of the Multi-Angle Implementation of Atmospheric Correction algorithm (MAIAC) which introduces a new way to compute parameters of the Ross-Thick Li-Sparse (RTLS) Bi-directional reflectance distribution function (BRDF), spectral surface albedo and bidirectional reflectance factors (BRF) from satellite measurements obtained by the Moderate...
Resource Type:: Article
Full Text:: kVf V μ0; μ;φð Þ þ kGf G μ0; μ;φð Þ: ð1Þ TheMAIAC AC algorithm derives RTLS coefficients directly by

ScholarsArchive@OSU