February 28, 2007
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Global Climate Change Digest
A Guide to Information on Greenhouse Gases and Ozone Depletion
Published July 1988 through June 1999
FROM VOLUME 3, NUMBER 3, MARCH 1990
"A 17,000-Year Glacio-Eustatic Sea Level Record: Influence of
Glacial Melting Rates on the Younger Dryas Event and Deep-Ocean Circulation,"
R.G. Fairbanks (Lamont-Doherty Geol. Observ., Columbia Univ., Palisades NY
10964), Nature, 342(6250), 637-642, Dec. 7, 1989.
Coral reefs drilled offshore of Barbados provide the first continuous and
detailed record of sea level change during the last deglaciation. The sea level
curve derived from this supports the French two-step model. Reviews evidence for
the oceanic and climatic response to two-step glaciation, with particular
emphasis on understanding the cause of the Younger Dryas event.
"Present and Near-Future Global Sea-Level Changes," P.A.
Pirazzoli (Lab. Geog. Phys. (URA 141 CNRS), 1 Place Aristide Briand, 92190
Meudon-Bellevue, France), Palaeogeog., Palaeoclimatol., Palaeoecolog. (Global
Plan. Change Sec.), 75, 241-258, Dec. 1989.
Values of 1.0-1.5 mm/yr often quoted in the literature for present-day
eustatic sea level rise have been obtained by an approach that results in
overestimation. The author proposes a new approach which shows that, on the
Atlantic coasts of Europe, when land movements are removed, the rise during the
last century has been only 4-6 cm (2-3 times smaller than claimed by most
others). However, a significant sea level rise during the next century is a
dangerous possibility that must not be ignored. Different authors suggest sea
level changes ranging from a drop of 7 cm to a rise of over 3.5 m, but there are
problems with the assumptions made and approaches used.
"Drumlins, Subglacial Meltwater Floods, and Ocean Responses,"
J. Shaw (Dept. Geog., Queen's Univ., Kingston, Ont. K7L 3N6, Can.), Geol.,
17(9), 853-856, Sep. 1989.
Drumlins and erosional marks in bedrock provide evidence for extensive,
subglacial meltwater floods. Concludes that rapid changes of sea level may not
be a direct consequence of melting arising from climatic causes, but may arise
from glacial hydrological causes alone--the accumulation and flow of meltwater
in reservoirs beneath the ice. Climatic fluctuations then become, in part, a
consequence rather than a cause of meltwater floods. Discusses climatic
implications of the formation of a coldwater lid over the North Atlantic Ocean.
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