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New CDIAC Data Products, Publications, and Activities

August 2015

  • CDIAC has published the LDEO Database V2014: Takahashi, T., S.C. Sutherland and A. Kozyr. 2015. Global Ocean Surface Water Partial Pressure of CO2 Database: Measurements Performed During 1957-2014 (Version 2014). ORNL/CDIAC-161, NDP-088(V2014). Carbon Dioxide Information Analysis Center, Oak Ridge National Laboratory, U.S. Department of Energy, Oak Ridge, Tennessee, doi: 10.3334/CDIAC/OTG.NDP088(V2014).
    Approximately 9.1 million measurements of surface water pCO2 made over the global oceans during 1957-2014 have been processed to make a uniform data file in this Version 2014. 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 data. This version includes the results of reanalysis for approximately 2.3 million pCO2 measurements which were made in the surface waters of the polar oceans aboard RVIB Palmer, RV Gould and USCGC Healy using an underway method developed and operated by the Lamont-Doherty Earth Observatory (LDEO) group.
    Although these data were reported to the CDIAC in a series of previous reports after the preliminary quality control, a reanalysis of the data has shown that these reported data call for corrections that account for the transit time of pumped sample water from the intake port near the bow to the pCO2 system located some distance away. The corrections applied to each data point are up to about ±8 μatm for the Palmer and Gould data and ±16 μatm for the Healy data, while the mean of the corrections for each cruise is less than ± 1 μatm. The method used and examples are described in detail in CDIAC report (Takahashi and Sutherland, 2015).
    In order to allow re-examination of the data in the future, a number of measured parameters relevant to pCO2 in seawater are listed. The overall uncertainty for the pCO2 values listed is estimated to be ± 2.5 μatm on the average. The names and institutional affiliations of the contributors are listed in Table 1. The documentations for the previous versions (V1.0, V2007, V2008, V2009, V2010, 2011, V2012 and V2013) of our database are available at CDIAC "
  • A new journal article published: Liu Z, Guan D, Wei W, Davis SJ, Ciais P, Bai J, Peng S, Zhang Q, Hubacek K, Marland G, Andres RJ, Crawford-Brown D, Lin J, Zhao H, Hong C, Boden TA, Feng K, Peters GP, Xi F, Liu J, Li Y, Zhao Y, Zeng N, He K (2015) Reduced carbon emission estimates from fossil fuel combustion and cement production in China. Nature 524:335-338. doi:10.1038/nature14677.

July 2015

  • Bob Andres attended the Our Common Future Under Climate Change Conference in Paris, France from 6-10 July 2015. He presented the poster “The changing face of global fossil fuel carbon dioxide emissions” with co-author T. Boden of CDIAC.

May 2015

  • imageBob Andres is an author on the paper, "Audit of the global carbon budget: estimate errors and their impact on uptake uncertainty" published in Biogeosciences (doi:10.5194/bg-12-2565-2015). In the paper the authors present a framework for assessing the temporal and spatial components of carbon budget estimate errors and their impact on uncertainty in net carbon uptake by the biosphere. Even when considering the major sources of error in the global carbon budget, the authors are 93% confident that terrestrial carbon uptake has increased and 97% confident that ocean carbon uptake has increased over the last 5 decades.

April 2015

  • Bob Andres attended the DOE Environmental System Science Principal Investigator Meeting in Potomac, MD from 28-29 April 2015. He presented the poster "Temporal, spatial, and uncertainty aspects of carbon dioxide emissions from fossil fuel combustion: Highlights of the last year of TES funding" with co-author A. King of CDIAC. Bob also was a co-author on one other presentation at the meeting.

March 2015

  • imageCDIAC has updated atmospheric histories for CFC-11, CFC-12, CFC-113, CCl4, SF6 and N2O from 1765 to 2015. The update incluudes a listing of mean northern and southern hemisphere tropospheric CFC-11, CFC-12, CFC-113, carbon tetrachloride (CCl4), sulfur hexafluoride (SF6) and nitrous oxide (N2O) concentrations for the period 1765.5 to 2015.5. The concentrations are given for the mid-point of each year (e.g. 2013.5) and expressed as the mixing ratio (mole fraction) of the trace gas in dry air. Concentration values are reported in parts-per-trillion (ppt) for CFC-11, CFC-12, CFC-113, CCl4 and SF6 and parts-per-billion (ppb) for N2O.

January 2015

December 2014

  • Bob Andres attended the 2014 American Geophysical Union Fall Meeting in San Francisco, CA, from 15-19 December 2014. He showed the poster, "Gridded uncertainty maps of fossil fuel carbon dioxide emissions: A new data product" with co-author Tom Boden of CDIAC. Bob also was a co-author on one other presentation at the meeting.

November 2014

October 2014

  • imageCDIAC has published "A high-frequency atmospheric and seawater pCO2 data set from 14 open ocean sites using a moored autonomous system" (NDP-0920) by Adrienne J. Sutton, Christopher L. Sabine, Jeremy T. Mathis of PMEL. In an effort to track ocean change and distinguish between natural and anthropogenic drivers, sustained ocean time-series measurements are becoming increasingly important. Advancements in the ocean carbon observation network over the last decade, such as the development and deployment of Moored Autonomous pCO2 (MAPCO2) systems, have dramatically improved our ability to characterize ocean climate, sea-air gas exchange, and biogeochemical processes around the globe. The MAPCO2 system provides high-resolution data that can measure inter-annual, seasonal, and sub-seasonal dynamics and constrain the impact of short-term biogeochemical variability on CO2 flux. Overall uncertainty of the MAPCO2 is less than 2 µatm for seawater partial pressure of CO2 (pCO2) and less than 1 µatm for air pCO2. The MAPCO2 maintains this level of uncertainty for over 400 days of autonomous operation. MAPCO2 measurements are consistent with ship-board seawater pCO2 measurements and GLOBALVIEW-CO2 boundary layer atmospheric values. CDIAC provides this open ocean MAPCO2 data set including 14 surface buoys from 2004 through 2011 and a description of the methods and data quality control involved.
  • imageThe 2014 version of the Total Carbon Column Observing Network (TCCON) data archive of dry column-averaged mixing ratios of CO2, CO, N2O, CH4, H2O, HDO and HF is now available. Data are available for Ascension Island (British Overseas Territory), Darwin (Australia), Edwards/Dryden (California, USA), Eureka (Nunavut, Canada), Garmisch (Germany), Indianapolis (Indiana, USA), Izaña (Tenerife, Spain), JPL2007 (California, USA), JPL2011 (California, USA), Karlsruhe (Germany), Lamont (Oklahoma, USA), Park Falls (Wisconsin, USA), Pasadena/Caltech (California, USA), Réunion Island (France), Saga (Japan), Sodankylä (Finland), and Wollongong (Australia). Other datasets will be uploaded shortly. The data are provided in netCDF format and include site-specific DOIs.

September 2014

  • imageThe Global Carbon Budget 2014 data (Le Quéré et. al.) are now available on CDIAC. The 2014 analysis quantifies all major components of the global carbon budget, including the uncertainties, based on the combination of a range of data, algorithms, statistics and model estimates and their interpretation by a broad scientific community. It shows that CO2 emissions from burning fossil fuel are projected to rise by 2.5% in 2014, 65% above 1990 levels (reference year for the Kyoto Protocol). China, the USA, the European Union (EU), and India are the largest emitters, together accounting for 58% of emissions. China's CO2 emissions grew by 4.2% in 2013, the USA's by 2.9%, and India's by 5.1%. The EU has decreased its emissions by 1.8%, although it continues to export a third of its emissions to China and other producers through imported goods and services. China's CO2 emissions per person overtook emissions in the EU for the first time in 2013 and are now larger than the USA and EU combined. CO2 emissions are caused primarily by burning fossil fuels, as well as by cement production and deforestation. Deforestation accounts for 8% of CO2 emissions.
  • imageCDIAC has published NDP-094: Climatological Distributions of pH, pCO2, Total CO2, Alkalinity, and CaCO3 Saturation in the Global Surface Ocean by Takahashi and co-workers. The distributions were calculated using a data set for pCO2, alkalinity and nutrient concentrations in surface waters (depths less than 50 m), which is built upon the GLODAP, CARINA and LDEO database. Calculated pH in global open-ocean surface waters ranges from 7.9 to 8.2 in the year 2005. Lower values are located in the upwelling regions in the tropical Pacific and in the Arabian and Bering Seas; and higher values are found in the subpolar and polar waters during the spring-summer months of intense photosynthetic production. Vast areas of subtropical oceans have seasonally varying pH values ranging from 8.05 during warmer months to 8.15 during colder months.
  • imageCDIAC has published An observation-based global monthly gridded sea surface pCO2 product from 1998 through 2011 and its monthly climatology. The observation-based pCO2 fields were created using a 2-step neural network technique. First the global ocean is divided into 16 biogeochemical provinces using a self organizing map. Then the non-linear relationship between variables known to drive the surface ocean carbon system and gridded observations from the SOCATv2 dataset is reconstructed. The final product is then produced by projecting surface temperature, chlorophyll, mixed layer depth, and atmospheric CO2 onto oceanic pCO2. This results in monthly pCO2 fields at 1°x1° resolution covering the entire globe with the exception of the Arctic Ocean and few marginal seas. More details can be found in Landschützer et al. 2013 and Landschützer et al. 2014.
  • Bob Andres attended the 13th Quadrennial iCACGP Symposium and 13th IGAC Science Conference in Natal, Brazil, from 22-26 September 2014. He showed a poster entitled "New uncertainty analysis of the CDIAC estimates of fossil fuel carbon dioxide emissions".

August 2014

  • imageThe Web Accessible Visualization and Extraction System (WAVES) has been updated with Global Surface pCO2 (LDEO) Database V2013 that was published last month. Approximately 9.0 million measurements of surface water pCO2 made over the global oceans during 1957-2013 have been processed to make a uniform data file in this Version 2013. 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 data.

July 2014

  • imageCDIAC has published data on regional carbon stocks, assumed NPP, and net land-use change emissions by ecosystem which was estimated using historical land-use data and a simple carbon model. The work is described by S. J. Smith and A. Rothwell in a paper, entitled, "Carbon density and anthropogenic land-use influences on net land-use change emissions" (Biogeosciences, 10, 6323-6337, doi:10.5194/bg-10-6323-2013, 2013.). The model results show a net land-use change in emissions from 1700–2000 of 250 GtC and from 1850–2000 of 210 GtC. These values are somewhat higher than many estimates in the literature, but comparable to recent estimates that use a similar land-use change data set that also includes the impact of wood harvesting on carbon stocks.
  • Bob Andres gave an invited talk at Appalachian State University, Boone, NC, on 28 Jul 2014, entitled "Some thoughts on uncertainty in fossil fuel emission estimates, flux and distributions".
  • Bob Andres and Tom Boden of CDIAC with David Higdon of Los Alamos National Laboratory published a paper entitled "A new evaluation of the uncertainty associated with CDIAC estimates of fossil fuel carbon dioxide emission" (Tellus B 2014, 66, 23616, In the paper they report the results of three uncertainty assessments associated with the global total of carbon dioxide emitted from fossil fuel use and cement production. The three assessments collectively give a range of uncertainty that spans from 1.0 to 13% (2 σ). Greatly simplifying the assessments give a global FFCO2 uncertainty value of 8.4% (2 σ) as a reasonable value.
  • Bob Andres was a coauthor on the paper, "Current systematic carbon-cycle observations and the need for implementing a policy-relevant carbon observing system" (Biogeosci. 11:3547-3602. doi:10.5194/bg-11-3547-2014). The paper discusses the need for a globally integrated carbon observation and analysis system to improve the fundamental understanding of the global carbon cycle, to improve our ability to project future changes, and to verify the effectiveness of policies aiming to reduce greenhouse gas emissions and increase carbon sequestration.