Hydrologic Cycle (in 103 km3)

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Hydrologic Cycle (in 103 km3)
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Distribution on Earth Water, water everywhere,
nor any drop to drink. Coleridge, Rime of the
Ancient Mariner
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Global Water Withdrawls - McNeill, Table 5.1
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Type of use, McNeill Table 5.1
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Global Irrigated Area, McNeill Table 6.2
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Mesopotamian wetlands 1976
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Mesopotamian Wetlands - 2000
From http//www.un.org/Pubs/chronicle/2002/issue2/
0202p44_mesopotamian_marshlands.html
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Fig. 1 (A) Trends in annual rates of application
of nitrogenous fertilizer (N), and of phosphate
(P) for all nations, except former USSR. (B)
Trends in global area of land in pasture or
crops. (C) Trend in global pesticide production
per year. (D) Trend in expeditures on pesticide
imports summed across all nations, transformed to
constant 1996 USD. All trends are as dependent on
global population and GDP as on time. From
Forecasting Agriculturally Driven Global
Environmental Change, D.Tilman et al., 2001,
Science, Vol.292, pg. 281-284
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Fig. 1) Global distribution of population in 1985
with respect to relative water stress threshold
of DIA/Q 0.4 indicating severe water scarcity.
A 30 resolution is used for this map. Mapping
reflects a mean global runoff of 40,000 km3/year
and aggregate water withdrawals of 3100 km3/year.
These estimates are highly dependent on
contemporary water use statistics, which reflect
a degree of uncertainty (e.g., assessments made
in 1987 vary gt 1300 km3/year). Use with caution.
From Global Water Resources Vulnerability from
Climate Change and Population Growth, 2000, C.J.
Vorosmarty et al., Science, Vol. 289, pg. 284-288
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