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2016 was hotter than 2015, the previous record. And 2015 hotter than 2014, the previous record year.
These record temperatures are all part of a warming trend that dates back to the late-19th century, largely caused by human emissions of carbon dioxide and other gases into the atmosphere.
A lot of this warming trend has been in the last 35 years. In fact, 16 of the 17 warmest years on record have been since 2001.
To help us gather this data, planes and boats travel out from Antarctic research stations to gather information from the Arctic region, in addition to space-based observatories.
Scientists at our Goddard Institute for Space Studies analyze data from 6,300 weather stations, observations of sea surface temperature and Antarctic research stations, all to determine how the average surface temperature is changing.
Scientists at the National Oceanic and Atmospheric Administration separately analyze the same data to track global temperature.
The two agencies reached the same conclusion about 2016’s record-setting heat.
Variations in local weather mean parts of the globe did not experience a record-setting year. Some places still had snow, cold weather and below-record temperatures, but the overall global average was higher than any previous year.
For instance, according to NOAA the average temperature in the 48 contiguous United States was not quite as high as in 2015, which still holds the record.
A combination of space- and land-based measurements gives us a unique perspective on Earth, the only planet we know of that supports life.
To learn more about the global temperature record or see how average surface temperature for individual months, visit: http://data.giss.nasa.gov/gistemp/
Make sure to follow us on Tumblr for your regular dose of space: http://nasa.tumblr.com
Earth’s 2015 surface temperatures were the warmest since modern record keeping began in 1880, according to independent analyses by NASA and the National Oceanic and Atmospheric Administration (NOAA).
Globally-averaged temperatures in 2015 shattered the previous mark set in 2014 by 0.23 degrees Fahrenheit (0.13 Celsius). Only once before, in 1998, has the new record been greater than the old record by this much.
The 2015 temperatures continue a long-term warming trend, according to analyses by scientists at NASA’s Goddard Institute for Space Studies (GISS) in New York. NOAA scientists concur with the finding that 2015 was the warmest year on record based on separate, independent analyses of the data.
Since the late-19th century, the planet’s average surface temperature has risen about 1.8 degrees Fahrenheit. This change is largely driven by increased carbon dioxide and other human-made emissions into the atmosphere.
An important thing to remember when reading this information is that it reflects global temperature average. That means that specific regions or areas could have experienced colder weather than usual, but overall the global temperature has risen.
How do we know? Our analyses incorporate surface temperature measurements from 6,300 weather stations, ship-and buoy-based observations of sea surface temperatures, and temperature measurements from Antarctic research stations.
What about El Niño? Phenomena such as El Niño or La Niña, which warm or cool the tropical Pacific Ocean, can contribute to short-term variations in global average temperature. Last year’s temperatures had an assist from a warming El Niño, but it is the cumulative effect of the long-term trend that has resulted in the record warming that we’re seeing.
The full 2015 surface temperature data set and the complete methodology used to make the temperature calculation are available HERE.
Make sure to follow us on Tumblr for your regular dose of space: http://nasa.tumblr.com
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