P
P. Ratana
Researcher at University of Arizona
Publications - 15
Citations - 1603
P. Ratana is an academic researcher from University of Arizona. The author has contributed to research in topics: Vegetation & Enhanced vegetation index. The author has an hindex of 8, co-authored 15 publications receiving 1468 citations. Previous affiliations of P. Ratana include Khon Kaen University & University of Technology, Sydney.
Papers
More filters
Journal ArticleDOI
Amazon rainforests green‐up with sunlight in dry season
Alfredo Huete,Kamel Didan,Yosio Edemir Shimabukuro,P. Ratana,Scott R. Saleska,Lucy R. Hutyra,Wenze Yang,Ramakrishna R. Nemani,Ranga B. Myneni +8 more
TL;DR: Huete et al. as discussed by the authors analyzed Amazon vegetation phenology at multiple scales with MODIS satellite measurements from 2000 to 2005, and found that canopy photosynthesis measured from eddy flux towers in both a rainforest and forest conversion site confirm their interpretation of satellite data, and suggest that basinwide carbon fluxes can be constrained by integrating remote sensing and local flux measurements.
Journal ArticleDOI
Large seasonal swings in leaf area of Amazon rainforests
Ranga B. Myneni,Wenze Yang,Wenze Yang,Ramakrishna R. Nemani,Alfredo Huete,Robert E. Dickinson,Yuri Knyazikhin,Kamel Didan,Rong Fu,Robinson I. Negrón Juárez,S. S. Saatchi,Hirofumi Hashimoto,Kazuhito Ichii,N.V. Shabanov,Bin Tan,P. Ratana,Jeffrey L. Privette,Jeffrey L. Privette,Jeffrey T. Morisette,Eric Vermote,Eric Vermote,David P. Roy,Robert E. Wolfe,Mark A. Friedl,Steven W. Running,Petr Votava,Nazmi El-Saleous,Sadashiva Devadiga,Yin Su,Vincent V. Salomonson +29 more
TL;DR: There are reported seasonal swings in green leaf area of ≈25% in a majority of the Amazon rainforests, which may be critical to initiation of the transition from dry to wet season, seasonal carbon balance between photosynthesis gains and respiratory losses, and litterfall nutrient cycling in moist tropical forests.
Journal ArticleDOI
Spatial patterns and temporal dynamics in savanna vegetation phenology across the North Australian Tropical Transect
Xuanlong Ma,Xuanlong Ma,Alfredo Huete,Qiang Qiang Yu,Natalia Restrepo Coupe,Kevin Davies,Mark Broich,P. Ratana,Jason Beringer,Lindsay B. Hutley,James Cleverly,Nicolas Boulain,Derek Eamus +12 more
TL;DR: This study investigated biogeographical and inter-annual patterns in savanna phenology along a 1100 km ecological rainfall gradient, known as North Australian Tropical Transect (NATT), encompassing humid coastal Eucalyptus forests and woodlands to xeric inland Acacia woodlands and shrublands and found good convergence between MODIS EVI and tower GEP, thereby confirming the potential to link these two independent data sources to better understand savanna ecosystem functioning.
Journal ArticleDOI
Multiple site tower flux and remote sensing comparisons of tropical forest dynamics in Monsoon Asia
Alfredo Huete,Natalia Restrepo-Coupe,P. Ratana,Kamel Didan,Scott R. Saleska,Kazuhito Ichii,Samreong Panuthai,Minoru Gamo +7 more
TL;DR: In this paper, the seasonal patterns and relationships of local site tower flux measures of gross primary productivity (Pg) with independent MODIS satellite greenness measures across three Monsoon Asia tropical forest types, encompassing drought-deciduous, dry evergreen, and humid evergreen secondary tropical forests.
Journal ArticleDOI
Analysis of Cerrado Physiognomies and Conversion in the MODIS Seasonal-Temporal Domain
TL;DR: In this article, the potential of Terra Moderate Resolution Imaging Spectroradiometer (MODIS) data is analyzed to discriminate among these diverse cerrado physiognomies and converted pastures based on their seasonal dynamics and phenology.