Motorists drive through a flooded section of Llewelyn Avenue near the Lafayette River in Norfolk, Virginia. The frequency of high-tide or nuisance flooding is expected to increase in part due to climate change and sea level rise. (Image by Will Parson)

A recent report from the U.S. Environmental Protection Agency outlines trends related to climate change in the United States, with data related to 37 climate indicators such as air and water temperatures, river and coastal flooding, ocean acidity and sea level rise.

New to the fourth edition of Climate Change Indicators in the United States is information on stream temperatures in the Chesapeake Bay region. After studying more than 50 years’ worth of data from 129 stream monitoring sites, experts found that stream temperatures are increasing throughout the watershed—across Delaware, Maryland, New York, Pennsylvania, Virginia, West Virginia and the District of Columbia—but the largest increases have occurred in the southern portions of the region. Water temperatures increased by an average of 1.2 degrees Fahrenheit (F) across all sites and by 2.2 degrees F at sites with trends considered statistically significant (to a 95-percent level).

Other effects of climate change throughout the Chesapeake Bay region are highlighted in the report. Washington, D.C., for example, has seen peak cherry blossom bloom dates shift approximately five days earlier since 1921. And from 2010 to 2015, Annapolis, Maryland, saw the second highest average number of coastal flood days: 46 days per year. The city has also experienced one of the most dramatic increases in overall frequency of flooding, where floods are at least 10 times more common than in the 1950s.

Also released in August is the National Ocean and Atmospheric Administration’s (NOAA) State of the Climate report, which confirmed that 2015 surpassed 2014 as the warmest year on record since the mid-to-late 19th century. The report, which is based on contributions from more than 450 scientists from 62 countries, found that land and ocean temperatures, sea level rise and greenhouse gases all broke previously-held records.

Learn more about Climate Change Indicators in the United States or the State of the Climate.



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