SuperUser Account Friday, May 2, 2014 / Categories: Research Headlines, Climate, 2014 Greenhouse gases continued rising in 2013; 34 percent increase since 1990 NOAA’s latest Annual Greenhouse Gas Index (AGGI), released today, Friday, May 2, 2014, shows that the warming influence from human-emitted gases continues to increase. This trend that began with the Industrial Revolution of the 1880s has accelerated in recent decades. Driven in large part by rising levels of carbon dioxide (CO2), the AGGI increased 1.5 percent between 2012 and 2013. This means the combined heating effect of human-emitted, long-lived greenhouse gases currently in the atmosphere has increased by 1.5 percent in one year, and 34 percent since 1990. "We continue to turn the dial up on this ‘electric blanket’ of ours without knowing what the resulting temperatures will be,” said James Butler, Ph.D., director of the Global Monitoring Division of NOAA’s Boulder-based Earth System Research Laboratory (ESRL). “We know that the world is getting warmer on average because of our continued emissions of heat-trapping gases. Turning down the dial on this heating will become increasingly more difficult as concentrations of the long-lived greenhouse gases continue to rise each year.” Scientists at NOAA calculate the AGGI each year from several decades of atmospheric data collected through an international cooperative air-sampling network of up to 80 sites around the world. Researchers from CIRES, NOAA’s Cooperative Institute for Research in Environmental Sciences at the University of Colorado Boulder, work with NOAA’s scientists at many stages ‒ from shipping air sampling flasks around the world to air sampling and data analysis. This index provides scientists and decision-makers with information useful for understanding climate change and its present-day and potential future impacts on our communities. In 2013, carbon dioxide concentrations for the first time in recorded history exceeded 400 parts per million(ppm) at Mauna Loa —considered a “global benchmark” monitoring site—in early May. This year, CO2 exceeded 400 ppm at Mauna Loa in mid-March, two months earlier than last year. Concentrations at Mauna Loa have continued to top 400 ppm throughout much of April and are expected to stay at historic high levels through May and early June, dropping in early summer only as trees and plants in the Northern Hemisphere begin to take up CO2 during the growing season. Carbon dioxide continues to be the largest greenhouse gas contributor to climate change, responsible for 87 percent of the increase this past year. The annual rise in CO2 is consistent with trends in fossil fuel emissions and carbon dioxide uptake by the ocean and land ecosystems. Historically, about half of the carbon dioxide emitted is removed from the atmosphere by the ocean and land vegetation. Atmospheric methane concentrations stabilized during the late 1990s and early 2000s, but have been rising again since 2007. The largest sources of methane emissions are naturally occurring and come from wetlands in the tropics. Human-caused methane emissions come from the production of coal, oil and natural gas, livestock, rice agriculture and waste. Nitrous oxide continues to rise at a steady rate. Nitrous oxide occurs naturally in the atmosphere, but has been increasing in recent decades owing largely to human-driven emissions associated with fertilizer applications, vehicles, and industrial emissions. Chemicals developed to replace ozone-depleting chlorofluorocarbons, or refrigerants, that were banned by the Montreal Protocol two decades ago are making up a larger share of greenhouse gases each year. NOAA researchers developed the AGGI in 2004 and have updated it annually since. Although it currently is calculated for years starting in 1978, atmospheric composition data from ice cores and other records could allow the record to be extended back centuries. To learn more about the index, visit: http://www.esrl.noaa.gov/gmd/aggi/. For more information, please contact Monica Allen, director of public affairs for NOAA Research, at 301-734-1123 or by email at firstname.lastname@example.org You can view online a short animation of the history of rising carbon dioxide emissions in the Earth's atmosphere. Previous Article NOAA-led researchers discover ocean acidity is dissolving shells of tiny snails off West Coast Next Article NOAA Researchers Contribute to The 3rd National Climate Assessment Revealing the Latest Impacts of Climate Change on the U.S. Print 32508 Tags: climate CO2 Greenhouse Gas methane Related articles New research finds the Western U.S. is a hot spot for "snow droughts" NOAA names University of Miami to host cooperative institute NOAA’s Climate Program Office launches Climate Risk Areas Initiative NOAA releases roadmap for the next 7 years of research and development NOAA collects a lot of data on the ocean. Here are 4 ways we use it.