‘Without them, groundwater resources become depleted’
Extreme precipitation events that cause severe flooding, loss of life and property damage aren’t exactly at the top of the weather wish list for most people. But it turns out they play a key role in replenishing underground aquifers in the western U.S.
The importance of groundwater will continue to grow in the years ahead — an era of population growth and climate disruption, so understanding the connection between big storms and groundwater recharge is critical, according to U.S. Geological Survey and Bureau of Reclamation scientists who have released a new study analyzing large, multi-year, quasi-decadal groundwater recharge events in the northern Utah portion of the Great Basin from 1960 to 2013.
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”→
And for now, there is no smoking gun pointing to a single reason for the decline. That means there’s no easy answer, either, the scientists said, explaining that, across the U.S. there are multiple and geographically diverse factors that play role.
The research focused on native bees because there is limited information on their exposure to pesticides. In fact, little is known about how toxic these pesticides are to native bee species at the levels detected in the environment.
“We found that the presence and proximity of nearby agricultural fields was an important factor resulting in the exposure of native bees to pesticides,” said USGS scientist Michelle Hladik, the report’s lead author. “Pesticides were detected in the bees caught in grasslands with no known direct pesticide applications.” Continue reading “Neonicotinoid pesticide impacts extend to wild bees”→
Alaska study helps quantify climate impacts of melting permafrost
Much of the carbon stored in ancient Alaska soils could be released to the atmosphere shortly upon melting, according to a new study that aimed to help quantify how fast permafrost decomposes and how much carbon dioxide is produced in the process.
Will fish and water bugs be decimated by systemic pesticides?
FRISCO — Neonicotinoid pesticides are spreading throughout the environment with as-yet unknown effects on human health, according to a new study by the U.S. Geological Survey.
The agency found the systemic pesticides in more than half the streams sampled across the country and in Puerto Rico during a survey between 2011 and 2014. This study is the first to take a nationwide look at the prevalence of neonicotinoid insecticides in agricultural and urban settings.
The research spanned 24 states and Puerto Rico and was completed as part of ongoing USGS investigations of pesticide and other contaminant levels in streams.
New USGS study measures North Slope shoreline losses
FRISCO — In the eternal battle between land and sea, the sea appears to be winning in northern Alaska, where much of the coastline is retreating at a rate of more than three feet per year, according to a new study by the U.S. Geological Survey.
The region has some of the highest shoreline erosion rates in the world, according to the research, which analyzed more than 50 years worth of measurements.