Latitudinal distribution of the world's population in 1990.
Typically, CDIAC checks all files that it receives and fully documents these files in the form of numeric data packages or computer model packages (NDPs and CMPs) before making them available to the general public. CDIAC is also offering files that have not been subjected to the normal CDIAC quality-control procedures to make them available more quickly. The abstracts that follow describe databases now available from CDIAC. These databases are available from CDIAC's World Wide Web site and its anonymous FTP area over the Internet and on magnetic media upon request. Files describing the contents of each database are furnished. No additional documentation is available from CDIAC. Questions about accessing the databases should be directed to CDIAC. Technical questions (e.g., methodology or accuracy) should be directed to the CDIAC staff listed for each database.
Yi-Fan Li, Environment Canada, Ontario, Canada
Compiler: A. L. Brenkert, CDIAC
DB1016 (1996)
This database breaks the Earth's surface into a grid that is one degree by one degree. For each grid cell, it gives the population for 1990, the percentage of the country's population that the cell's population represents, the percentage of a country's total area represented, the percentage of the grid cell that is terrestrial (by country), an indicator of how many countries are represented, an indicator if the cell is part of the sea, the cell's latitude and longitude coordinates, a grid code number [which is keyed to the latitude/longitude value and used in Environment Canada's Global Emission Inventory Activity (GEIA) databases], the country or region's name, and the United Nations three-digit country code for that name. In addition, land surface areas were calculated by CDIAC for each country in a grid cell, based on the latitude-dependent grid-cell calculations of the Goddard Institute for Space Studies.
For the national population estimates, FAO and Guinness population data were used. For cities with populations greater than 50,000, the Rand McNally World Atlas was used. When necessary, these data were updated to 1990 values with census data. The rural populations were calculated with distribution factors based on national population data, data on approximately 90,000 cities and towns, and the assumption that rural population is proportional to the number of cities and towns.
In some areas of the world, reliable data are difficult to obtain. For 117 grid cells, populations are given without companion area and/or land/sea partitioning information, and sometimes the number of countries indicated is different from the number of countries in the grid cell with population values.
The database consists of four files: a readme (db1016.doc) file, a
data file, a SAS® file, and FORTRAN data-retrieval code, all in
ASCII. They total 3.4 MB and are available on 8-mm tapes, 0.25-in.
QIC tapes, and floppy diskettes.
Latitudinal distribution of the world's population in 1990.
A. N. D. Auclair, J. A. Bedford, and C. Revenga, Science and Policy
Associates, Inc., Washington, D.C.
Compiler: A. L. Brenkert, CDIAC
DB1017 (1996)
The database lists annual changes in areal extent (Ha) and gross merchantable wood volume (m3) produced by depletion and accrual processes in boreal and temperate forests in Alaska, Canada, Europe, former Soviet Union, Non-Soviet temperate Asia, and the contiguous United States for the years 1890 through 1990. Forest depletions (source terms for atmospheric CO2) are identified as forest pests, forest dieback, forest fires, forest harvest, and land-use changes (predominantly the conversion of forest, temperate woodland, and shrubland to cropland). Forest accruals (sink terms for atmospheric CO2) are identified as fire exclusion, fire suppression, and afforestation or crop abandonment. The changes in areal extent and gross merchantable wood volume are calculated separately for each of the following biomes: forest tundra, boreal softwoods, mixed hardwoods, temperate softwoods, temperate hardwoods, and temperate wood- and shrublands.
The database was compiled from the scientific literature and the following sources: (1) national forest statistics of the USDA Forest Service and Forestry Canada; (2) national forestry annual data on specific forest depletions (pests, wildfire, etc.) and accruals (replanting etc.); (3) tree-growth-rate data from NOAA's National Geophysical Data Center; (4) 1979 to 1990 forest harvesting data for Eurasia from UN/FAO reports; and (5) land-use change from 1700 to 1980 as reconstructed by Houghton and Hackler.
The data files were produced under contract to the U.S. Environmental Protection Agency (EPA), Office of Environment Processes and Effect Research for use as input to an EPA carbon-flux model.
The data are accessible over the Internet and on floppy diskette
and 8-mm tape. The database consists of 69 data files, nine GIF
files, and a readme file (db1017.doc) and requires about 1.3 MB of
disk storage.
Estimated forest losses to fire each year in hundreds of millions of cubic meters of wood.
Typically, CDIAC checks all data files that it receives and fully documents these files in the form of numeric data packages (NDPs) or computer model packages (CMPs) before making them available to the general public. In 1994, CDIAC began to offer data files that have not undergone this rigorous quality control and documentation so these files could be made available more quickly. Since then, the list of databases offered has grown quickly.Below is a summary of the databases currently available from CDIAC.
Atmospheric Halocarbons and Nitrous Oxide from the ALE/GAGE/AGAGE Network, DB1001
ICRCCM Infrared (Clear-Sky) Line-by-Line Radiative Fluxes, DB1002
A Computer-Based Atlas of Global Instrumental Climate Data, DB1003
Alaskan Historical Climatology Network Serial Temperature and Precipitation Data, DB1004
FORAST Database, DB1005
GISS 3-D Global Tracer Transport Model, DB1006
Atmospheric Methane at Cape Meares, Oregon, USA: A High-Resolution Database for the Period 1979 to 1992, DB1007
Atmospheric Methane Mixing Ratios: The NOAA/CMDL Global Cooperative Air-Sampling Network, 1983-1993, DB1008
IPCC, WG 1, 1994: Modelling Results Relating Future Atmospheric CO2 Concentrations to Industrial Emissions, DB1009
Globally Averaged Atmospheric CFC-11 Concentrations: Monthly and Annual Data for 1975 to 1992, DB1010
Atmospheric Carbon Monoxide Mixing Ratios, NOAA Climate Monitoring and Diagnostics Laboratory Cooperative Air Sampling Network, 1988 to 1993, DB1011
A Global Model for Present-Day Atmospheric-Soil CO2 Consumption by the Chemical Erosion of Continental Rocks (GEM-CO2), DB1012
Global and Latitudinal Estimates of 
13C from Fossil-Fuel Consumption and Cement Manufacture, DB1013
In Situ Carbon-13 and Oxygen-18 Ratios of Atmospheric CO2 from Cape Grim, Tasmania, Australia: 1982-1993, DB1014
Global Patterns of Carbon Dioxide Emissions from Soils on a 0.5-Degree-Grid-Cell Basis, DB1015
Global Population Distribution (1990), Terrestrial Area, and Country Name Information on a One-by-One-Degree Grid-Cell Basis, DB1016
Northern Hemisphere Biome- and Process-Specific Changes in Forest Area and Gross Merchantable Volume: 1890-1990, DB1017
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