U.S. Geological Survey: Science for a Changing World - USGS visiaul identifier and link to main Web site at http://www.usgs.gov/

Table 1. Tropical and subtropical climate change classification (modified from Cecil, 1990, 2003).
Relative duration
Cause
Time (years)
Long term Continental drift;
orogenesis;
Ice house/
greenhouse		 106–108
105–107
Intermediate term 100- and 400-ka cycles
of orbital eccentricity;
glacial/interglacial		 105
Short term Cycles in orbital
obliquity and
precession		 104
Very short term
(Millennial)		 Uncertain 103
Instantaneous Weather 10−2
(weeks, days, or hours)
U.S. Department of the Interior, U.S. Geological Survey
URL: https:// pubsdata.usgs.gov /pubs/circ/2004/1264/html/trip3/table1.html
For more information, contact Blaine Cecil
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