![]() Sea level rise projections are relative to the 2000 to 2004 base period. Projections for sea level rise in New York City increase from 11 inches to 21 inches by the 2050s, 18 inches to 39 inches by the 2080s, and, 22 inches to 50 inches, with the worst case of up to six feet, by 2100. That is almost twice the observed global rate of 0.5 to 0.7 inches per decade over a similar time period. – Sea levels have risen in New York City 1.1 feet since 1900. Future mean annual precipitation is projected to increase 4 to 11 percent by the 2050s and 5 to 13 percent by the 2080s, relative to the 1980s base period. – Mean annual precipitation has increased by a total of 8 inches from 1900 to 2013. The frequency of heat waves is projected to increase from 2 per year in the 1980s to roughly 6 per year by the 2080s. Future mean annual temperatures are projected to increase 4.1 to 5.7 degrees F by the 2050s and 5.3 to 8.8 degrees F by the 2080s, relative to the 1980s base period. – Mean annual temperature has increased a total of 3.4 degrees Fahrenheit (F) from 1900 to 2013. Specific report findings about local New York observations and projections include: Map of annual temperature changes in the Northeast in 2050. “This collaboration will help ensure that climate science developed for the New York metropolitan region informs and draws from the best available information, positioning residents and planners to confront expected future changes in the most effective way possible.” “The NPCC is a prototype for how federal government scientists and municipal policymakers can work together,” said Rosenzweig, who also is affiliated with the Center for Climate Systems Research at Columbia University’s Earth Institute, New York. The GISS climate model was used in climate projections, and scientists at GISS led the technical team, which analyzed the scientific data and developed the projections. ![]() As some of the leading Earth scientists in the metropolitan New York area, GISS researchers have been involved in the panel’s work since its beginning. ![]() The NPCC was founded in 2008 to study the effects of climate change on New York City’s five boroughs and surrounding region. Observed and projected temperature in New York City. ![]()
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