Ecosystems on land store large amounts of the carbon emitted by human activities, and protecting and restoring forests and other vegetation are important tools in slowing climate change. However, there are large uncertainties in global estimates of the balance between how much carbon ecosystems store and how much they release into the atmosphere due to deforestation, wildfire, and other disturbances. To improve estimates of the global carbon balance, NASA, USDA-FS, and other contributors assessed changes in the amount...
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Highlights
Since 1989, the U.S. Global Change Research Program (USGCRP) has submitted annual reports to Congress called Our Changing Planet. The reports describe the status of USGCRP research activities, provide progress updates, and document recent accomplishments
In particular, Our Changing Planet highlights progress and accomplishments in interagency activities. These highlights represent the broad spectrum of USGCRP activities that extend from Earth system observations, modeling, and fundamental research through synthesis and assessment, decision support, education, and public engagement. Highlights describe the state of science at the time of publication of each yearly report, and may not reflect more recent advances in understanding. The date of publication of the source report is noted on each highlight page.
SilvaCarbon leverages state-of-the-art science and technology to advance the generation and use of information in managing forest and terrestrial carbon.
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Mapping forest carbon stocks with in situ, airborne, and satellite data supports forest management in the western United States.
The Carbon Monitoring System (CMS), a NASA-led effort also involving the USDA Forest Service (USDA-FS), NOAA, the USGS, and non-governmental scientists, focuses on improving the monitoring of carbon stocks and fluxes (or the movement of carbon between the oceans, atmosphere, land, and ecosystems) to support carbon management activities. A CMS study is helping the USDA-FS and other...
Recent studies are improving the ability to quantify ecosystem carbon dynamics and greenhouse gas exchange in changing Arctic and boreal landscapes.
Northern high latitudes are warming at more than twice the global average, driving permafrost thaw, changes in surface water extent, increased wildfire, and other changes that affect how much carbon is stored in and emitted to the atmosphere by soils, vegetation, and inland waters.[1] Measuring the flow of carbon between ecosystems, landscapes, and the...
Experimental warming of a peatland ecosystem showed a rapid shift towards net carbon loss to the atmosphere.
Peatlands cover only about 3 percent of Earth’s land surface but store around 30 percent of global soil carbon. As the climate warms, these carbon stocks are vulnerable to release into the atmosphere as the greenhouse gases carbon dioxide and methane, contributing to a cycle of further warming and carbon release. The SPRUCE (Spruce and Peatland Responses Under Changing Environments...
Scientists are investigating the movement of carbon from the atmosphere to the deeper ocean via ecological processes.
Microscopic organisms known as phytoplankton in the upper ocean play a critical role in Earth’s carbon cycle and climate, transporting carbon from the surface to the deeper ocean where it is stored for months to millennia. This movement of carbon—known as the biological carbon pump— represents a significant sink for atmospheric carbon dioxide, but measuring it remains a challenge. A better understanding of what influences the function of the ocean's...
The Second State of the Carbon Cycle Report (SOCCR2), released by USGCRP in November 2018, is a state-of-the-science assessment of the carbon cycle in North America and its connection to climate and society. Authored by more than 200 experts from the United States, Canada, and Mexico, SOCCR2 focuses on U.S. and North American carbon cycle processes and their interactions with global-scale carbon budgets and climate change impacts over the last decade.
The report includes an assessment of...
Long-frozen northern soils known as permafrost contain one of the world’s largest stores of organic carbon. This reservoir is stable while soils are frozen, but as permafrost thaws, decomposition of biomass by microbes produces the heat-trapping gases carbon dioxide and methane, returning soil carbon to the atmosphere where it contributes to climate change. Permafrost carbon stores are expected to be increasingly vulnerable to decomposition as the climate continues to change, leading to a feedback cycle of further warming and permafrost thaw.[1]...
Scientists are gaining new understanding of processes that control greenhouse gas emissions from Arctic permafrost, a potential driver of significant future warming.
Rapid warming in the Arctic is causing carbon-rich soils known as permafrost, previously frozen for millennia, to thaw. As thawing soils decompose, the greenhouse gases carbon dioxide and methane are released into the atmosphere in varying proportions depending on the conditions under which decomposition occurs. Permafrost emissions could contribute significantly to future warming...
Researchers are experimentally warming northern peatlands to understand carbon cycling in the climate of the future.
Northern peatlands hold large stocks of organic carbon in their soils that are vulnerable to release into the atmosphere as the greenhouse gases carbon dioxide and methane as the climate warms. Emissions of methane, which has about 28 times the warming power...