Each year, global average surface temperature is calculated.
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It takes thousands of thermometers, but the math is pretty simple. The UK Met Office Hadley Centre and the University of East Anglia’s Climatic Research Unit jointly produce Here’s how global temperatures in the four datasets compare over the past 130 years.
GISTEMP and MLOST both begin in 1880, whereas JMA starts a bit later in 1891.By combining the grid boxes, scientists work out average temperatures for the northern and southern hemispheres. They also differ in how many land stations they have around the world, too. Latest in: These are, in turn, used to work out temperature anomalies from season-to-season and year-to-year.Scientists use four major datasets to study global temperature.
Geographic coverage by these proxies is necessarily sparse, and various proxies are more sensitive to faster fluctuations. Latest in: In fact, la Niña was in place across the tropical Pacific from January–April, and it left an imprint on the region's temp… Latest in: HadCRUT4 has about 5,500, GISTEMP takes middle place with about 6,300, but MLOST has the most of all, with about 7,000 land stations.The four datasets differ in other important ways, too, including the time period they cover. Latest in: The warmth occurred in the absence of El Niño, which is usually a factor in extreme global warmth. Latest Global Average Tropospheric Temperatures Since 1979, NOAA satellites have been carrying instruments which measure the natural microwave thermal emissions from oxygen in the atmosphere.
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