This color-coded map shows the evolution of abnormalities in global surface temperatures from 1880 to 2012. The last picture represents the anomalies in global temperatures averaged from 2008-2012.
NASA scientists say that 2012 was the ninth warmest year since 1880, which continues the trend of rising global temperatures over time. Except for 1998, the nine warmest years on this record, which includes the last 132 years, occurred from 2000, 2010 and 2005 being the warmest years.

The Goddard Institute for Space Studies (Goddard Institute for Space Studies, or GISS, for its acronym in English), NASA is located in New York and responsible for monitoring global surface temperatures continuously published on Tuesday an updated analysis comparing temperatures around the world in 2012 with average global temperatures recorded around mid-twentieth century. The comparison shows that the Earth continues to experience warmer than those recorded temperatures decades.

This color-coded map shows the evolution of abnormalities in global surface temperatures from 1880 to 2012. The last picture represents the anomalies in global temperatures averaged from 2008-2012.

The average temperature in 2012 was around 14.6 degrees Celsius (58.3 degrees Fahrenheit), which is 0.6 ° C (1.0 ° F) warmer than the reference corresponding to the middle of the century XX. According to the new analysis, the average global temperature has increased 0.8 ° C (1.4 ° F) since 1880.

Scientists emphasize that weather patterns always cause fluctuations in average temperature year to year, but the steady increase in the levels of greenhouse gases in the Earth’s atmosphere ensures a long-term increase in global temperatures . It is not necessarily warmer each year than last, but given the current pattern of the increase in greenhouse gases, scientists expect that each successive decade is warmer than the previous one.

“Having a year of data is not in itself significant,” says Gabin Schmidt, who is a climatologist at GISS. “What matters is that this decade is warmer than the last and that was, in turn, hotter than the one that preceded it. The planet is warming. The reason is because it is heating in the atmosphere are injecting amounts of increasing carbon dioxide “.

Carbon dioxide is a greenhouse gas that traps heat and is also one of the main agents that control the climate on Earth. Although it occurs naturally is also emitted when fossil fuels are burned to produce energy. Due to increasing manmade emissions, levels of carbon dioxide in Earth’s atmosphere have been rising continuously for decades.

The level of carbon dioxide in the atmosphere was 285 parts per million, in 1880, the year that the GISS temperature record began. By 1960, the concentration of atmospheric carbon dioxide, measured by the Mauna Loa Observatory NOAA (National Oceanographic and Atmospheric Administration and National Oceanic and Atmospheric Administration, in Spanish), was 315 parts per million. At present, these measurements exceed 390 parts per million.

While the world experienced relatively warmer temperatures in 2012, sector continental United States endured the warmest year, much of which we have registered, according to NOAA. This entity is the body that officially deals with the climate record of the United States.

Data sets collected by NASA and NOAA provided independent confirmation of the recent warming trend. [More data]

“Registered in the United States during the summer of 2012 temperatures are an example of a new trend of abnormal seasonal extremes that are warmer than the highest seasonal temperatures recorded in the mid-twentieth century,” says the director of GISS, James E. Hansen. “The climate dice are now loaded. Some stations will remain colder than the long-term average, but the perceptive people should realize that the frequency of unusually hot extremes is increasing. Are the extremes that have the greatest impact on humans and other life forms on the planet “.

The analysis of the temperature produced by GISS is performed based on climate data from more than 1,000 weather stations around the world as well as satellite observations of surface ocean temperatures and measurements made by research stations located in the Antarctica. A program that is available publicly is then used to calculate the difference between the average temperature in the same place in the period surface temperatures of a specific month and from 1951 to 1980. This period, which spans three decades, it is used as a reference point for analysis. Last year he experienced cooler temperatures than average from 1951-1980 was 1976.

The GISS temperature record is one of several analysis of global temperatures, along with those produced by the Met Office Hadley Centre in the UK, and the National Climatic Data Center of the National Oceanic and Atmospheric Administration in Asheville, North Carolina. Although these three primary records used slightly different methods, trends show in general terms, a close match.

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