Study suggests carbon uptake by forests has doubled since the 1950s
Scientists say they’ve place yet another piece in the complex global plant-carbon cycle, with a new study suggested that atmospheric CO2 levels have plateaued in recent years because forests and grasslands are removing more of the heat-trapping gas. The research was led by a scientist with the Department of Energy’s Lawrence Berkeley National Laboratory .
New satellite data helps track photosynthesis in evergreens
Despite the huge importance of forests in the global carbon cycle, researchers still aren’t exactly certain how they will respond to climate change. But that could soon change thanks to satellite sensors that can track photosynthesis in evergreen forests by monitoring slight color shifts.
The new information could help assess the health of northern forests over time, showing how they are responding to global warming. Photosynthesis is easy to track in deciduous trees — when leaves bud or turn yellow and fall off. But until recently, it had been impossible to detect in evergreen conifers on a large scale. Continue reading “How will boreal forests respond to global warming?”→
After studying the impacts of recent droughts in the Amazon, researchers are warning that the rainforest may gradually be losing its ability to remove carbon from the atmosphere. But their study also shows that the ecosystem is resilient and can recover quickly in between droughts.
The study used data from from droughts in 2005 and 2010, finding that tree growth slowed across the vast forests of the Amazon Basin. Long-term measurements from theRAINFOR network spanning nearly a hundred locations across the Amazon Basin helped show how the rainforest temporarily lost biomass. Both droughts killed many trees, but the 2010 drought also had the effect of slowing the growth rates of the survivors, suggesting that many trees were adversely affected but not to the point of death. Continue reading “Droughts slow Amazon carbon uptake”→
New study helps explain how carbon flux changes over time
The shells of tiny ocean organisms called foraminifera have once again given climate researchers huge clues about the long-term carbon cycle in the world’s oceans. The information helps show the buildup of heat-trapping greenhouse gases will affect the climate.
Alaska makes up about 18 percent of the total U.S. land area but accounts for about 35 percent of the total carbon stock. The future of that carbon has big implications for global climate. If it’s released quickly, it could drive up global temperatures more than expected. And the carbon stored in high latitude ecosystems is considered to be vulnerable to climate change because of global warming. Continue reading “Climate: USGS measures Alaska land carbon stock”→
In a new study, the UCAR researchers estimated that those aquifers may store more carbon than all the plants on land.
About 40 percent of the carbon dioxide produced by people stays in the atmosphere and heats the planet. About 30 percent is taken up by oceans, where it is rapidly acidifying the water to the detriment of shellfish and other marine species.
Short-rotation pastures with long recovery time for fields may yield environmental benefits
FRISCO — While healthy forests are known to be important carbon sinks in the global atmospheric cycle, there’s also a role for robust soils, according to a study team that’s exploring whether new grazing management techniques could have long-term environmental benefits.