نتایج جستجو برای: gpp

تعداد نتایج: 1505  

2016
Sami K Saikaly Monica Mattes

Generalized pustular psoriasis (GPP) is a rare form of childhood psoriasis, often requiring systemic therapy, which is challenging as there is a paucity of randomized controlled trials and standardized guidelines. Biologic agents have been used in adults and in pediatric plaque psoriasis, but evidence regarding their efficacy in pediatric GPP has slowly become available. The objective of this s...

2015
Jianyong Ma Xiaodong Yan Wenjie Dong Jieming Chou

Coverage rate, a critical variable for gridded forest area, has been neglected by previous studies in estimating the annual gross primary production (GPP) of global forest ecosystems. In this study, we investigated to what extent the coverage rate could impact forest GPP estimates from 1982 to 2011. Here we show that the traditional calculation without considering the coverage rate globally ove...

2009
N. R. Patel V. K. Dadhwal S. K. Saha

The present study investigates the characteristics of CO2 exchange (photosynthesis and respiration) over agricultural site dominated by wheat crop and their relationship with ecosystem parameters from MODIS. Eddy covariance measurements of CO2 and H2O exchanges was carried out at 10Hz interval and fluxes of CO2 were computed at half-hourly time steps. The net ecosystem exchange (NEE) was partit...

2016
Sara Vicca Manuela Balzarolo Iolanda Filella André Granier Mathias Herbst Alexander Knohl Bernard Longdoz Martina Mund Zoltan Nagy Krisztina Pintér Serge Rambal Jan Verbesselt Aleixandre Verger Achim Zeileis Chao Zhang Josep Peñuelas

Severe droughts strongly impact photosynthesis (GPP), and satellite imagery has yet to demonstrate its ability to detect drought effects. Especially changes in vegetation functioning when vegetation state remains unaltered (no browning or defoliation) pose a challenge to satellite-derived indicators. We evaluated the performance of different satellite indicators to detect strong drought effects...

2006
Alfredo Huete Edward Glenn Allan Matthias Stuart Marsh Kurtis Thome Abdullah F. Rahman Ho Jin Kim Youngwook Kim Lisa Goins Judith Ellwanger Veronica Hirsch Alicia Velasquez

Vegetation indices (VI ) play an important role in studies of global climate and biogeochemical cycles, and are also positively related to many biophysical parameters and satellite products, such as leaf area index (LAI), gross primary production (GPP), land surface water index (LSWI) and land surface temperature (LST). In this study we found that VI’s had strong relationships with some biophys...

2002
Sarvar Patel Marcus Wong

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2015
Helene Muri Ulrike Niemeier Jón Egill Kristjánsson

Tropical forests represent a major atmospheric carbon dioxide sink. Here the gross primary productivity (GPP) response of tropical rainforests to climate engineering via marine sky brightening under a future scenario is investigated in three Earth systemmodels. The model response is diverse, and in two of the three models, the tropical GPP shows a decrease from the marine sky brightening climat...

2004
Frank K. SOONG Wai-Kit LO Satoshi NAKAMURA

Generalized posterior probability (GPP), a statistical confidence measure, is used for verification of large vocabulary continuous speech recognition (LVCSR) output at subword, word and utterance levels. GPP is obtained by combining exponentially and optimally weighted products of acoustic and language model scores for reappeared units in the reduced search space (e.g., word graph). Experimenta...

2005
david. turner

Operational monitoring of global terrestrial gross primary production (GPP) and net primary production (NPP) is now underway using imagery from the satellite-borne Moderate Resolution Imaging Spectroradiometer (MODIS) sensor. Evaluation of MODIS GPP and NPP products will require site-level studies across a range of biomes, with close attention to numerous scaling issues that must be addressed t...

2015
Xi Yang Jianwu Tang John F. Mustard Jung-Eun Lee Micol Rossini Joanna Joiner J. William Munger Ari Kornfeld Andrew D. Richardson

Previous studies have suggested that solar-induced chlorophyll fluorescence (SIF) is correlated with Gross Primary Production (GPP). However, it remains unclear to what extent this relationship is due to absorbed photosynthetically active radiation (APAR) and/or light use efficiency (LUE). Here we present the first time series of near-surface measurement of canopy-scale SIF at 760 nm in tempera...

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