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New CDIAC Data Products, Publications, and Activities

March 2014

February 2014

  • The Recent Greenhouse Gas Concentrations page has been updated as of March 2014.

December 2013

November 2013

October 2013

September 2013

August 2013

  • imageBob Andres is a coauthor on the paper, "Estimation of regional surface CO2 fluxes with GOSAT observations using two inverse modeling approaches" which was published in Proceedings of SPIE Vol. 8529, Remote Sensing and Modeling of the Atmosphere, Oceans, and Interactions IV, 85290G. doi:10.1117/12.979664. The authors applied two inverse modeling approaches to analysis of observations from the Greenhouse gases Observing SATellite (GOSAT) of atmospheric carbon dioxide and produced estimates of the seasonal and interannual variations of the regional CO2 fluxes.
    Bob Andres is also a coauthor on the article, "The Use of a High-Resolution Emission Data Set in a Global Eulerian-Lagrangian Coupled Model" in Lagrangian Modeling of the Atmosphere (eds J. Lin, D. Brunner, C. Gerbig, A. Stohl, A. Luhar and P. Webley), American Geophysical Union, Washington, D. C.. doi: 10.1029/2012GM001263.

July 2013

  • imageChanges in the global ocean mean of carbon-13 in dissolved inorganic carbon (δ13CDIC) are thought to reflect the balance of erosion and sequester of carbonate over very long geologic periods and changes in the size and composition of the terrestrial active organic carbon pools over shorter time spans. CDIAC has extracted δ13CDIC observations from the GLODAP and CARINA databases covering 1990-2005 from all oceans and all depths. The combined database of 17,989 δ13CDIC observations has been used by Schmittner et al. in a new three-dimensional model of 13C cycling in the ocean to examine large-scale carbon movements. Model results suggest that the uptake of anthropogenic carbon has reduced the spatial gradients in δ13CDIC that were present in the preindustrial surface ocean.
  • imageCDIAC has updated fossil-fuel emission estimates through 2010. Since 1751 approximately 365 billion metric tonnes of carbon have been released to the atmosphere from the consumption of fossil fuels and cement production. Half of these fossil-fuel CO2 emissions have occurred since the mid-1980s. The 2010 global fossil-fuel carbon emission estimate—9,167 million metric tons of carbon—represents an all-time high and a 4.9% increase over 2009 emissions. The data visualization page for global, regional, national, and USA time series and gridded data is being updated with the 2010 estimates.
  • Bob Andres conbtributed to a reply to a comment (doi:10.1038/nclimate1817) on the paper, Atmospheric verification of anthropogenic CO2 emission trends in the journal, Nature Climate Change (doi:10.1038/nclimate1925).

June 2013

  • imageAGAGE data have been updated through September 2012. Measurements of CFC-115 at Jungfraujoch, Switzerland, back to April 2008 are included in this version. CFC 115 (CClF2CF3), or Chloropentafluoroethane, is an ozone-depleting substance, that was primarily used as a refrigerant. It has an atmospheric lifetime of 1700 years and a 100-year global warming potential of 7,370. The latest update also includes the following:
    • Measurements of HCFC 142b (CH3CF2Cl) and HCFC 22 (CHClF2) at Jungfraujoch for August-September 2012,
    • Hydrogen (H2) data for both Mace Head, Ireland, and Cape Grim, Tasmania, in the "gc-md" directory. These data have been converted to a new MPI2009 scale. Please see the "H2calibration_2013_v01.doc" (or "H2calibration_2013_v01.pdf" file) file for more information about this new scale.
    • Recent MEDUSA methyl bromide (CH3Br) Zeppelin (Norway) site.
  • Isotopes "Gateway" pages have been posted. The Gateway pages to isotope data are now posted and available by clicking on "Carbon Isotopes" "Deuterium" or "Oxygen Isotopes" in our list of atmospheric trace gases (under "Data" in our top navigation bar). As for the other gateway pages to date, either modern records or ice core data are available.
  • An oxygen gateway page has been posted. Records of atmospheric oxygen since 1989 are available from the Scripps Institution of Oceanography. Links to data and graphics can now be found by clicking on "Oxygen" on our list of atmospheric trace gases.
  • imageThe paper Monitoring and understanding changes in heat waves, cold waves, floods and droughts in the United States: State of knowledge, by Peterson, T.C., et al., (on which CDIAC's Dale Kaiser was a lead author) has been published in the June 2013 edition of the Bulletin of the American Meteorological Society, and includes supplementary material that was not available in the previously announced early online release.
  • Bob Andres attended the 9th International Carbon Dioxide Conference in Beijing, China from 2-7 June 2013. He showed the poster, "A new look at the uncertainty associated with CDIAC estimates of global carbon dioxide emissions from fossil fuel consumption" with co-author Tom Boden of CDIAC. Bob also was a co-author on three other presentations at the meeting.

May 2013

  • imageThe PACIFICA Database (NDP-092) has been published in CDIAC. PACIFICA (PACIFic ocean Interior CArbon) was an international collaborative project for the data synthesis of ocean interior carbon and its related parameters in the Pacific Ocean. The North Pacific Marine Science Organization (PICES), Section of Carbon and Climate (S-CC) supported the project. Individual cruise data can be downloaded from the CDIAC cruise summary table, and data products are available in the CDIAC PACIFICA FTP area.
    CDIAC has merged hydrographic/hydrochemical datasets from a total of 213 cruises, including those from cruises conducted between the late 1980s and 2000 but not stored in GLODAP, as well as CLIVAR/CO2 Repeat Hydrography datasets from the 2000s. The adjustment values were suggested to account for the analytical offsets in the data of dissolved inorganic carbon, total alkalinity, salinity, oxygen, and nutrients (nitrate and nitrite, phosphate, and silicic acid) for each cruise as a result of the secondary quality control procedure, based on the crossover analysis for the data from deep layers (Tanhua et al., 2010). We also merged a total of 59 adjusted datasets from Line P off the west coast of Canada. Finally, we have produced the adjusted PACIFICA database that consists of datasets from a total of 306 cruises that also include 34 datasets from WOCE Hydrographic Program cruises in the Pacific Ocean conducted in the 1990s.
    Note that the quality of data taken in the WHP/Repeat Hydrography cruises are usually among the best, but several of them have also been offset-adjusted in the data product as a result of the secondary quality check. The individual cruise data also have been or will be exported to CCHDO, JODC, and US-NODC, so that they can be accessed more widely through the IOC/IODE network for oceanographic data exchange and World Data System under ICSU in the future. Reference information for the PACIFICA Database CDIAC can be found here.
  • imageThe LDEO (Takahashi) Database V2012 [NDP-088(V2012)] is now available at CDIAC. Approximately 6.7 million measurements of surface water pCO2 made over the global oceans during 1957-2012 have been processed to make a uniform data file. Measurements made in open oceans as well as in coastal waters are included. The data assembled include only those measured using equilibrator-CO2 analyzer systems, and have been quality-controlled based upon the stability of the system performance, the reliability of calibrations for CO2 analysis, and the internal consistency of the data. To allow re-examination of the data in the future, a number of measured parameters relevant to pCO2 in seawater are listed as well.
    This version is referred to as Version 2012, and includes the data collected through 31 December 2012. In this update, about 277,000 pCO2 measurements made during 29 new cruise/ship files are added to the previous version 2011. The new additions include the new data from our field operations. These data files are also posted on the LDEO website.
  • Bob Andres was a co-author on the paper, "The global carbon budget 1959–2011", which was published in the jornal, Earth System Science Data.

April 2013

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    Annual mean of monthly mean maximum temperature from 1889 to 2012 at Tombstone, Arizona
    CDIAC has updated the monthly data included in NOAA's United States Historical Climatology Network (USHCN) dataset through 2012. The update, dubbed Version 2.5, replaces Version 2.0 and reflects modifications to the underlying database made by its compilers at NOAA's National Climatic Data Center (NCDC). As in earlier versions, the files include average, maximum, and minimum temperature, and precipitation amount from 1218 stations across the contiguous U.S. A graphical user interface enables plotting and downloading of data from individual stations.
  • Bob Andres is a co-author on the paper, "Inverse modeling of CO2 fluxes using GOSAT data and multi-year ground-based observations. Scientific Online Letters on the Atmosphere", published in the journal, Scientific Online Letters on the Atmosphere (doi:10.2151/sola.2013-011).