Explanipedia

The weak land carbon sink hypothesis Open

James T. Randerson, Yue Li, Weiwei Fu, François Primeau, Jinhyuk E. Kim , et al. · 2025

Over the past three decades, assessments of the contemporary global carbon budget consistently report a strong net land carbon sink. Here, we review evidence supporting this paradigm and quantify the differences in global and Northern Hemi…

Direct measurements can help to understand the changes in ecosystems: Amazonia a case study Open

Luciana V. Gatti, Camilla L. Cunha, Luciano Marani, Henrique Cassol, Cassiano Gustavo Messias , et al. · 2023

The Amazon is the largest rainforest on the planet and was an important carbon sink. The carbon sink is declining, mainly due to an increase in tree mortality as a result of deforestation, degradation, and local, regional and global climat…

Modeling Land‐Atmosphere Coupling at Cloud‐Resolving Scale Within the Multiple Atmosphere Multiple Land (MAML) Framework in SP‐E3SM Open

Guangxing Lin, L. Ruby Leung, Jungmin Lee, Bryce E. Harrop, Ian Baker , et al. · 2023

Representing subgrid variabilities of land surface processes and their upscaled effects is crucial for global climate modeling. Here, we implement a multiple atmosphere multiple land (MAML) framework in the superparamaterized version of E3…

Amazon carbon emissions double mainly by dismantled in law enforcement Open

Luciana V. Gatti, Camilla L. Cunha, Luciano Marani, Henrique Cassol, Cassiano Gustavo Messias , et al. · 2022

The Amazon Forest is a major locus for carbon and water cycling in the climate system whose function has been degraded in recent decades by land use and climate change. Most studies of Amazonia’s carbon balance have been limited by sparse …

Where Has All the Carbon Gone? Open

Scott Denning · 2021

Carbon is among the most abundant substances in the universe; although severely depleted on Earth, it is the primary structural element in biochemistry. Complex interactions between carbon and climate have stabilized the Earth system over …

COS-derived GPP relationships with temperature and light help explain high-latitude atmospheric CO 2 seasonal cycle amplification Open

Lei Hu, S. A. Montzka, Aleya Kaushik, A. E. Andrews, Colm Sweeney , et al. · 2021

Significance Interactions between terrestrial carbon dioxide (CO 2 ) fluxes and climate or terrestrial ecosystem feedbacks exert a large uncertainty in climate projections. This uncertainty arises in part from poor quantification of gross …

Accurate Simulation of Both Sensitivity and Variability for Amazonian Photosynthesis: Is It Too Much to Ask? Open

Sarah M. Gallup, Ian Baker, John L. Gallup, Natalia Restrepo‐Coupé, Katherine Haynes , et al. · 2021

Estimates of Amazon rainforest gross primary productivity (GPP) differ by a factor of 2 across a suite of three statistical and 18 process models. This wide spread contributes uncertainty to predictions of future climate. We compare the me…

The Atmospheric Carbon and Transport (ACT)-America Mission Open

K. J. Davis, E. V. Browell, Sha Feng, Thomas Lauvaux, M. D. Obland , et al. · 2021

The Atmospheric Carbon and Transport (ACT)-America NASA Earth Venture Suborbital Mission set out to improve regional atmospheric greenhouse gas (GHG) inversions by exploring the intersection of the strong GHG fluxes and vigorous atmospheri…

SiB4 Modeled Global 0.5-Degree Hourly Carbon Fluxes and Productivity, 2000-2018 Open

Katherine Haynes, I. Baker, Scott Denning · 2021

This dataset provides global hourly output predicted from the Simple Biosphere Model, Version 4.2 (SiB4), at a 0.5-degree spatial resolution covering the time period 2000 through 2018. SiB4 is a mechanistic land surface model that integrat…

SiB4 Modeled Global 0.5-Degree Monthly Carbon Fluxes and Pools, 2000-2018 Open

Katherine Haynes, I. Baker, Scott Denning · 2021

This dataset provides global monthly output predicted by the Simple Biosphere Model, Version 4.2 (SiB4), at a 0.5-degree spatial resolution covering the time period 2000 through 2018. SiB4 is a mechanistic land surface model that integrate…

Multi-Scale Land-Atmosphere Interactions: Modeling Convective Processes from Plants to Planet Open

Scott Denning · 2021

Research accomplishments include: 1)Two case studies of the effects of heterogeneous soil moisture and surface energy budgets on organization and propagation of convective precipitation during MC3E. 2) Development and evaluation of a new a…

Multiscale Land-Atmosphere Interaction in Tropical Ecosystems Open

Scott Denning · 2021

A leading source of uncertainty in the magnitude of future climate change arises from feedback between the physical climate system and the carbon cycle. Output from 15 Earth System Models (ESMs) in the Coupled Model Intercomparison Project…

Estimation of Global Scale Carbon Fluxes Using Maximum Likelihood Ensemble Filter Open

Manjula Perera, R. S. Lokupitiya, Scott Denning, Prabir K. Patra, D. Zupanski , et al. · 2020

Inverse modelling method named Maximum likelihood Ensemble Filter (MLEF) was used to estimate gridded surface CO fluxes using continuous, flask and Comprehensive Observation Network for TRace gases by AIrLiner (CONTRAIL) data for the years…

Evaluation of OCO‐2 X Variability at Local and Synoptic Scales using Lidar and In Situ Observations from the ACT‐America Campaigns Open

Emily Bell, C. O’Dell, K. J. Davis, J. F. Campbell, E. V. Browell , et al. · 2020

With nearly 1 million observations of column‐mean carbon dioxide concentration (X ) per day, the Orbiting Carbon Observatory 2 (OCO‐2) presents exciting possibilities for monitoring the global carbon cycle, including the detection of subco…

Simple Biosphere Model version 4.2 (SiB4) technical description Open

Katherine Haynes, Ian Baker, Scott Denning · 2020

The Simple Biosphere Model (SiB4) is a mechanistic, prognostic land surface model that integrates heterogeneous land cover, environmentally responsive prognostic phenology, dynamic carbon allocation, and cascading carbon pools from live bi…

A Multiyear Gridded Data Ensemble of Surface Biogenic Carbon Fluxes for North America: Evaluation and Analysis of Results Open

Yu Zhou, C. A. Williams, Thomas Lauvaux, K. J. Davis, Sha Feng , et al. · 2020

Accurate and fine‐scale estimates of biogenic carbon fluxes are critical for measuring and monitoring the biosphere's responses and feedback to the climate system. Currently available data products from flux towers and model‐intercompariso…

Representing Grasslands Using Dynamic Prognostic Phenology Based on Biological Growth Stages: 1. Implementation in the Simple Biosphere Model (SiB4) Open

Katherine Haynes, Ian Baker, Scott Denning, Reto Stöckli, Kevin Schaefer , et al. · 2019

Grasslands grow in a sequence of seasonal growth stages that respond to both climate and weather, and these relationships can be used to establish a strategy for predicting plant phenology. Current plant states (phenophase) can be represen…

Representing Grasslands Using Dynamic Prognostic Phenology Based on Biological Growth Stages: Part 2. Carbon Cycling Open

Katherine Haynes, Ian Baker, Scott Denning, Sebastian Wolf, Georg Wohlfahrt , et al. · 2019

Grasslands are one of the most widely distributed and abundant vegetation types globally, and land surface models struggle to accurately simulate grassland carbon dioxide, energy, and water fluxes. Here we hypothesize that this is due to l…

Kebakaran hutan Amazon itu berbahaya, tapi tidak mengurangi cadangan oksigen Open

Scott Denning · 2019

Surface‐Atmosphere Coupling Scale, the Fate of Water, and Ecophysiological Function in a Brazilian Forest Open

Ian Baker, Scott Denning, D. A. Dazlich, Anna Harper, Mark Branson , et al. · 2019

Tropical South America plays a central role in global climate. Bowen ratio teleconnects to circulation and precipitation processes far afield, and the global CO 2 growth rate is strongly influenced by carbon cycle processes in South Americ…

ACT-America: Gridded Ensembles of Surface Biogenic Carbon Fluxes, 2003-2019 Open

Yu Zhou, C. A. Williams, Thomas Lauvaux, Sha Feng, I. Baker , et al. · 2019

This data set provides gridded, model-derived gross primary productivity (GPP), ecosystem respiration (RECO), and net ecosystem exchange (NEE) of CO2 biogenic fluxes and their uncertainties at monthly and 3-hourly time scales over 2003-201…

Quantifying the Impact of Atmospheric Transport Uncertainty on CO2 Surface Flux Estimates Open

A. E. Schuh, A. R. Jacobson, Sourish Basu, Brad Weir, D. F. Baker , et al. · 2019

We show that transport differences between two commonly used global chemical transport models, GEOS‐Chem and TM5, lead to systematic space‐time differences in modeled distributions of carbon dioxide and sulfur hexafluoride. The distributio…

100 Years of Earth System Model Development Open

David A. Randall, Cecilia M. Bitz, Gökhan Danabasoglu, Scott Denning, Peter R. Gent , et al. · 2019

Today’s global Earth system models began as simple regional models of tropospheric weather systems. Over the past century, the physical realism of the models has steadily increased, while the scope of the models has broadened to include th…

Temuan baru tentang pemanasan laut: 5 pertanyaan dijawab oleh ilmuwan Open

Scott Denning · 2018

Estimation of Asian and Global Carbon Fluxes Using Maximum Likelihood Ensemble Filter (MLEF) Open

K.M.P. Perera, R. S. Lokupitiya, D. Zupanski, Scott Denning, R.G.N. Meegama , et al. · 2017

2016 International Land Model Benchmarking (ILAMB) Workshop Report Open

Forrest M. Hoffman, Charles D. Koven, G. Keppel‐Aleks, David M. Lawrence, W. J. Riley , et al. · 2017

As Earth system models become increasingly complex, there is a growing need for comprehensive and multi-faceted evaluation of model projections. To advance understanding of biogeochemical processes and their interactions with hydrology and…

Closing the scale gap between land surface parameterizations and GCMs with a new scheme, SiB3‐Bins Open

Ian Baker, P. J. Sellers, Scott Denning, I. D. Medina, P. M. Kraus , et al. · 2017

The interaction of land with the atmosphere is sensitive to soil moisture ( W ). Evapotranspiration (ET) reacts to soil moisture in a nonlinear way, f ( W ), as soils dry from saturation to wilt point. This nonlinear behavior and the fact …

International Land Model Benchmarking (ILAMB) Workshop Report, Technical Report DOE/SC-0186 Open

Forrest M. Hoffman, Charles D. Koven, Gretchen Kappel-Aleks, David M. Lawrence, W. J. Riley , et al. · 2016

As Earth system models become increasingly complex, there is a growing need for comprehensive and multi-faceted evaluation of model projections. To advance understanding of biogeochemical processes and their interactions with hydrology and…

Collaborative data sharing in climate science: acknowledgement, transparency, & access Open

Scott Denning · 2016

Presented at the National data integrity conference: data sharing: the how, why, when and when not to share held on June 2-3, 2016 at University of Colorado, Denver, Colorado. The National Data Integrity Conference is a gathering of people…

Carbon and energy fluxes in cropland ecosystems: a model-data comparison Open

Erandathie Lokupitiya, Scott Denning, Kevin Schaefer, Daniel Ricciuto, Robert S. Anderson , et al. · 2016

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