ORNL/CDIAC-65

Trends '93: A Compendium of Data on Global Change (August 1994)

T. A. Boden and D. P. Kaiser, Oak Ridge National Laboratory

R. J. Sepanski and F. W. Stoss, The University of Tennessee, Energy, Environment, and Resources Center

This document provides synopses of frequently used global-change data. This third issue of the Trends series presents historical and modern records of atmospheric concentrations of carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), two chlorofluorocarbons (CFC-11 and CFC-12), a hydrochlorofluorocarbon (HCFC-22), and two halons (H-1301 and H-1211) from an expanded number of globally distributed sites. Virtually all of the modern records extend into the 1990s, some into 1994. Additional trace gas data presented in Trends '93 include historical atmospheric CO2, CH4, and N2O records derived from ice cores. Trends '93 also includes revised and updated estimates through 1991 for global, regional, and national CO2 emissions produced from the burning of fossil fuels, gas flaring, and the production of cement. Updated global emissions estimates through 1992 are presented for CFC-11 and CFC-12. Trends '93 also updates and expands the presentation of long-term temperature records, whose spatial coverage ranges from an individual Antarctic ice core site to the entire globe and from the Earth's surface to the lower stratosphere. New subject matter appearing in Trends '93 includes a chapter for long-term regional precipitation records, several time-series records for atmospheric aerosols, and isotopic 14C measurements for atmospheric CO2 from several globally distributed sites.

Data records are presented in multipage formats, each dealing with a specific site, region, or emissions species. The data records include tables; graphs; discussions of methods for collecting, measuring, and reporting the data; trends in the data; and references to literature providing further information. Instructions for citing contributions by the principal investigator(s) are provided for each data summary.

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