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C. N. Wold· G. J. Schwartz· C. Morrill
Acknowledgements
We thank colleagues from the Climate Change Research Section, Climate and
Global Dynamics Division of the National Center for Atmospheric Research
(NCAR) for their encouragement and support. This research was supported in
part by an appointment to the Global Change Distinguished Postdoctoral Fellowships Program sponsored by the U.S. Department of Energy, Office of Health
and Environmental Research, and administered by the Oak Ridge Institute for
Science and Education. Office space, computer, and travel support were kindly
provided by NCAR. All of the illustrations were prepared by CNW using GMT
version 2.1.4 (Wessel and Smith 1991).
Appendix I: Compilation Methods
An important source of information for the present compilation was Lefond
(1969). His book contained information on the largest saline pans, saline mud
flats, salt lakes, marginal marine sabkhas, and salinas, as well as information on
solar salt and brine extraction facilities. He also outlined the geological history
and locations of the largest pre-Holocene salt deposits. Using Lefond (1969) as a
guide, saline pans, saline mud flats, salt lakes, marginal marine sabkhas, and
salinas were digitized from the 1: 1 000000 scale maps of the world published by
the U. S. Army Mapping Service (AMS; later called the Defense Mapping Agency)
in the International Map of the World (AMS 1934-1965). Many smaller saltforming basins were apparent and/or labeled on the 1:1000000 scale maps and
were also digitized.
The naturally occurring evaporite deposits were digitized as polygons and the
solar salt operations were digitized as points. The solar salt operations were either described or shown on much smaller scale maps in Lefond (1969). Solar salt
operations in Mexico were digitized from a 1:5000000 scale map shown on a Bipolar Oblique Conic Conformal Projection. All the other solar salt operations
were digitized from the 1:10000000 scale GEBCO (1984) maps shown on a Mercator projection. Some solar salt operations that could not be located on the GEBCO (1984) maps were found in the Times Atlas of the World (Bartholomew
1955-1959). The locations of naturally-occurring evaporites were digitized from
the International Map of the World (AMS 1934-1965). There were three map
projections used for the "International Map of the World;' a Transverse Mercator, International Polyconic and Lambert Conic Conformal Projection. The digitized polygons were classified according to one of three categories: (1) non -marine saline pans and mudflats; (2) non -marine saline lakes; and (3) marginal marine sabkhas and salinas. The total number of digitized polygons was approximately 3934 saline pans and saline mud flats, 1176 saline lakes, and 200 marginal
marine sabkhas and salinas, for a total of 5310 digitized polygons. There were
659 solar salt operations included as points in the database. This represents a
minimum estimate of the total number of solar salt operations that exist at the
present time.
C. N. Wold· G. J. Schwartz· C. Morrill
Acknowledgements
We thank colleagues from the Climate Change Research Section, Climate and
Global Dynamics Division of the National Center for Atmospheric Research
(NCAR) for their encouragement and support. This research was supported in
part by an appointment to the Global Change Distinguished Postdoctoral Fellowships Program sponsored by the U.S. Department of Energy, Office of Health
and Environmental Research, and administered by the Oak Ridge Institute for
Science and Education. Office space, computer, and travel support were kindly
provided by NCAR. All of the illustrations were prepared by CNW using GMT
version 2.1.4 (Wessel and Smith 1991).
Appendix I: Compilation Methods
An important source of information for the present compilation was Lefond
(1969). His book contained information on the largest saline pans, saline mud
flats, salt lakes, marginal marine sabkhas, and salinas, as well as information on
solar salt and brine extraction facilities. He also outlined the geological history
and locations of the largest pre-Holocene salt deposits. Using Lefond (1969) as a
guide, saline pans, saline mud flats, salt lakes, marginal marine sabkhas, and
salinas were digitized from the 1: 1 000000 scale maps of the world published by
the U. S. Army Mapping Service (AMS; later called the Defense Mapping Agency)
in the International Map of the World (AMS 1934-1965). Many smaller saltforming basins were apparent and/or labeled on the 1:1000000 scale maps and
were also digitized.
The naturally occurring evaporite deposits were digitized as polygons and the
solar salt operations were digitized as points. The solar salt operations were either described or shown on much smaller scale maps in Lefond (1969). Solar salt
operations in Mexico were digitized from a 1:5000000 scale map shown on a Bipolar Oblique Conic Conformal Projection. All the other solar salt operations
were digitized from the 1:10000000 scale GEBCO (1984) maps shown on a Mercator projection. Some solar salt operations that could not be located on the GEBCO (1984) maps were found in the Times Atlas of the World (Bartholomew
1955-1959). The locations of naturally-occurring evaporites were digitized from
the International Map of the World (AMS 1934-1965). There were three map
projections used for the "International Map of the World;' a Transverse Mercator, International Polyconic and Lambert Conic Conformal Projection. The digitized polygons were classified according to one of three categories: (1) non -marine saline pans and mudflats; (2) non -marine saline lakes; and (3) marginal marine sabkhas and salinas. The total number of digitized polygons was approximately 3934 saline pans and saline mud flats, 1176 saline lakes, and 200 marginal
marine sabkhas and salinas, for a total of 5310 digitized polygons. There were
659 solar salt operations included as points in the database. This represents a
minimum estimate of the total number of solar salt operations that exist at the
present time.