Transcript 1990 Global Population - Socioeconomic Data and

Methodologies of Creation of Gridded
Global Population Datasets for 1990
and Their Applications in Compilation
of Gridded Emission Inventories for
Different Pollutants
Yi-Fan Li (1) and Ashbindu Singh (2)
(1) Air Quality Research Branch, Meteorological
Service of Canada, Environmental Canada
(2) UNEP/GRID-Sioux Falls, EROS Data Centre,
Sioux Falls, SD 57198, USA
Introduction
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In 1996, with financial support from the United
Nations Environment Programme (UNEP),
Environment Canada has created a population
database depicting the worldwide distribution of
population for 1990 with a 1X1
latitude/longitude resolution;
Over 75,000 registered users have accessed or
downloaded the datasets from UNEP/GRID
website since the data was released.
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Methodology

Point sources: city population
• Around 6,000 cities and their populations from Rand
McNally World Atlas

Area sources
• 90,000 cities and towns as surrogate data
• global rural population distribution factor
 Population data for United States, Canada,
China, and the former Soviet Union were
replaced by better census datasets
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Global city population in 1990

Around 6,000 cities with population > 50K
inhabitants (with some exceptions) are located
in the grid cells;
 For cities with data from earlier than 1985, a
growth rate of 0.63 are applied in developed
countries, and 2.13 for those in less developed
countries;
 Then the average annual urban growth rate
from UN for different countries are used to
transfer city population of 1985-1989 to
values of 1990.
City population in 1990 with 1 x1 lat/long resolution
Global rural population distribution
factor for 1990
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Around 20,500 major cities and 69,000 minor cities
from 223 countries were allocated to 12,200 grid
cells;
Population factors were assigned to each city: 2 for
each major city, and 1 for each minor city;
The assigned population factors in each grid cell were
summed up for each country, and a rural population
distribution factor dataset for 1990 with 1X1
degree latitude/longitude resolution was obtained.
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Global residence area with 1 x1 lat/long resolution
Global rural population distribution

The total “rural” population was obtained by subtracting the
global city population in 1990 from the total of national
populations for 1990. This total “rural” population was
allocated to grid cells according to the formula:
Pop. factor in the cell for the country
Rural pop in cell = Total rural population X 
Total pop. factor for the country
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Refinement of the Dtataset:
The data for the following countries are replaced by better
datasets.
 United States Census Data
• Two 1990 census population datasets for approximately 23,400 USA
cities and 3,141 counties were used.

Canadian Data
• A gridded Canadian population dataset for 1991 with a 1/6 latitude and 1/4
longitude grid resolution was obtained from the Canadian National Pollutant
Release Inventory, and scaled to 1990 for each grid by a factor of
26,647/27,297 (Canadian population for 1990 is 26,647,000, for 1991 is
27,297,000).
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Refinement of the Dtataset (Ctn.):

Chinese Population Data
• The Chinese 1990 census data, which contains population data for 2,405
administration units (cities and counties), were allocated over the cities and
county capitals.

Former Soviet Union Data
• The 1990 population data for 15 former USSR republics were obtained from
Dr. Alexey G. Ryaboshapko, Institute of Global Climate and Ecology,
Moscow, Russia. City and town population figures were allocated to each
cell according to its latitude and longitude. The rural population was
determined separately for each county (raion) in Russia, and for each
province (oblast) in other former Soviet Republics.
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Gridded Global Population Datasets for 1990

The 1990 global population dataset contains 16,762
records and covers 209 countries and 11,748 grid
cells  about 1.8% of the total 648,000 grid cells
worldwide. The population of the countries in the
database is 5.291 billion, within 0.07% of the FAO’s
total estimated world population for 1990, of 5,295
billion.
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Global population for 1990 with 1 x1 lat/long resolution
Applications in Compilation of Gridded Emission
Inventories for Different Pollutants
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Gridded population data are a very important
surrogate for distributing area sources of a large
amount of pollutants;
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This database has been accepted as the standard
population data by Global Emissions Inventory
Activities (GEIA), a component of the International
Global Atmospheric Chemistry core project of the
International Geosphere - Biosphere Program;

GEIA Website: http://www.geiacenter.org
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Selected Publications in which the population data
were used as surrogate
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Li, Y. F., Zhang, Y. J., Cao, G. L., Liu, Jian Hui, and Barrie, L.A., 1998,
“Distribution of seasonal SO2 emissions from fuel combustion and industrial
activities in Shanxi, China, with 1/6o X 1/4o longitude/latitude resolution”,
Atmospheric Environment, 33, 257-265.
Pacyna, J. M., Scholtz, M. T., and Li, Y. F., 1995, “global budget of metal
sources”, Environmental Reviews, Vol. 3, 145-159.
Brook, Jeffery, Zhang, Leiming, and Li, Yi-Fan, 1999, “Modelling of dry
deposition velocities on local and regional scales. Part II: Modelled dry
deposition over south-eastern Canada” Atmospheric Environment, 33, 50535070
McCulloch, A., M. Aucott, C.M. Benkovitz, T.E. Graedel, G. Kleiman, P.M.
Midgley, Y.F. Li, 1999, “Global emissions of hydrogen chloride and
chloromethane from coal combustion, incineration and industrial activities: the
Reactive Chlorine Emissions Inventory”, J. Geophys. Res., 104, D7, 8391-8403
Aucott, M., A. McCulloch, T. E. Graedel, G. Kleiman, P. M. Midgley, and Y.F.
Li, 1999, “Anthropogenic emissions of trichloromethane (chloroform, CHCl3)
and chlorodifluoromethane (HCFC-22): Reactive Chlorine Emissions
Inventory”, J. Geophys. Res., 104, D7, 8405-8415
Selected Publications in which the population data
were used as surrogate
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McCulloch, A., M. L. Aucott, T. E. Graedel, G. Kleiman, P. Midgley, and
Y.F. Li, 1999, “Industrial emissions of trichloroethene, tetrachloroethene,
and dichloromethane: The Reactive Chlorine Emissions Inventory”, J.
Geophys. Res., 104, D7, 8417-8427
Keene, William C., M. Aslam K. Khalil, David J. Erickson, III, Archie
McCulloch, Thomas E. Graedel, Michael L. Aucott, Sun Ling Gong, David
B. Harper, Gary Kleiman, Valentine Koropalov, Jurgen M. Lobert, Pauline
Midgley, Robert M. Moore, Christophe Seuzaret, William T. Sturges, Len
A. Barrie, Jennifer A. Logan, Y.F. Li, 1999, “Composite global emissions of
reactive chlorine from anthropogenic and natural sources: The Reactive
Chlorine Emissions Inventory”, J. Geophys. Res., 104, D7, 8429-8440
Environment
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Acknowledgments
Financial
support from Environment Canada
and UNEP made this work possible;
Thanks
also to Dr. Alexey G. Ryaboshapko,
Institute of Global Climate and Ecology,
Moscow, Russia for providing population data of
former Soviet Union;
Comments
sent to us by many users of the data
are highly appreciated.