Results 51 to 60 of about 493 (122)

Parameter Estimation in Land Surface Models: Challenges and Opportunities With Data Assimilation and Machine Learning

open access: yesJournal of Advances in Modeling Earth Systems, Volume 17, Issue 11, November 2025.
Abstract Accurately predicting terrestrial ecosystem responses to climate change over long‐timescales is crucial for addressing global challenges. This relies on mechanistic modeling of ecosystem processes through land surface models (LSMs). Despite their importance, LSMs face significant uncertainties due to poorly constrained parameters, especially ...
Nina Raoult   +28 more
wiley   +1 more source

Quantifying the missing link between forest albedo and productivity in the boreal zone [PDF]

open access: yesBiogeosciences, 2016
Albedo and fraction of absorbed photosynthetically active radiation (FAPAR) determine the shortwave radiation balance and productivity of forests. Currently, the physical link between forest albedo and productivity is poorly understood, yet it is crucial
A. Hovi   +4 more
doaj   +1 more source

Delayed Pantropical Carbon Sink Recovery Due To Asynchronous Post‐El Niño Photosynthesis and Respiration Trajectories

open access: yesGeophysical Research Letters, Volume 52, Issue 19, 16 October 2025.
Abstract Occurring in 2015/16, the strong El Niño has been shown to significantly influence the pantropical carbon fluxes with multiple lines of evidence. However, a comprehensive understanding on the regional and vegetation‐specific net ecosystem productivity (NEP) in response to this El Niño event and its recovery trajectories remain unclear.
Mousong Wu   +6 more
wiley   +1 more source

Bridging the gap between remotely sensed phenology and the underlying ecophysiological processes: The SWELL model

open access: yesMethods in Ecology and Evolution, Volume 16, Issue 7, Page 1473-1488, July 2025.
Abstract Vegetation phenology studies the periodic recurrence of plant life‐cycle events and is essential for understanding ecosystem responses to environmental changes. Remote sensing has become a key tool for monitoring phenological events on large spatial and temporal scales, primarily using vegetation indices like the Normalized Difference ...
Sofia Bajocco   +2 more
wiley   +1 more source

Estimating Forest fAPAR from Multispectral Landsat-8 Data Using the Invertible Forest Reflectance Model INFORM

open access: yesRemote Sensing, 2015
The estimation of the Fraction of Absorbed Photosynthetically Active Radiation in forests (forest fAPAR) from multi-spectral Landsat-8 data is investigated in this paper using a physically based radiative transfer model (Invertible Forest Reflectance ...
Huili Yuan   +5 more
doaj   +1 more source

Continental Scale Soil Monitoring: A Proposed Multi‐Scale Framing of Soil Quality

open access: yesEuropean Journal of Soil Science, Volume 76, Issue 4, July–August 2025.
ABSTRACT Globally, soils are subjected to various management practices and stressors which can lead to degradation. This makes their protection essential for sustaining many functions and services as well as maintaining the overall life support system of Earth.
Grant A. Campbell   +23 more
wiley   +1 more source

Assessment of Satellite-Derived FAPAR Products With Different Spatial Resolutions for Gross Primary Productivity Estimation

open access: yesIEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Accurate estimation of gross primary productivity (GPP) is crucial for understanding terrestrial carbon cycles and assessing ecosystem health. Light use efficiency (LUE) models, which are widely used for the generation of regional or global GPP products,
Xiyu Zhang   +5 more
doaj   +1 more source

Assessment of MODIS NPP algorithm-based estimates using soil fertility and forest inventory data in mixed hemiboreal forests

open access: yesMetsanduslikud Uurimused, 2017
Optical remote sensing data-based estimates of terrestrial net primary production (NPP) are released by different projects using light use efficiency-type models.
Lang Mait   +5 more
doaj   +1 more source

Quality Assessment of PROBA-V LAI, fAPAR and fCOVER Collection 300 m Products of Copernicus Global Land Service

open access: yesRemote Sensing, 2020
The Copernicus Global Land Service (CGLS) provides global time series of leaf area index (LAI), fraction of absorbed photosynthetically active radiation (fAPAR) and fraction of vegetation cover (fCOVER) data at a resolution of 300 m and a frequency of 10
Beatriz Fuster   +8 more
doaj   +1 more source

Addressing Challenges in Simulating Inter–Annual Variability of Gross Primary Production

open access: yesJournal of Advances in Modeling Earth Systems, Volume 17, Issue 5, May 2025.
Abstract A long‐standing challenge in studying the global carbon cycle has been understanding the factors controlling inter–annual variation (IAV) of carbon fluxes, and improving their representations in existing biogeochemical models. Here, we compared an optimality‐based model and a semi‐empirical light use efficiency model to understand how current ...
Ranit De   +34 more
wiley   +1 more source

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