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28 Scientific Drilling, No. 2, March 2006 Progress ReportsProgress Reports

Summary: 28 Scientific Drilling, No. 2, March 2006
Progress ReportsProgress Reports
The ocean covers 70% of the Earth's surface, and because
of its fluid motion and large thermal inertia, it plays a central
role in redistributing heat about the globe and in shaping the
Earth's climate. The northern North Atlantic is the primary
deep ventilator of the world ocean, and it is now recognized
that deep-water production is closely related to global climate
(Broecker et al., 1985). Despite the importance of North
Atlantic Deep Water to global and regional climate, there is a
lack of long-term observations of temperature and salinity
variations. Surface and near-surface measurements show
natural variability on timescales of decades (Wunsch, 1992;
Gammelsrød et al., 1992). The few deep oceanographic
observations indicate that the thermohaline structure of the
North Atlantic has changed over the past twenty to thirty
years and that bottom-water temperatures (BWT) have
varied significantly (Brewer et al., 1983; Roemmich and
Wunsch, 1984; Antonov, 1993). We hypothesize that,


Source: Acton, Gary - Department of Geology, University of California, Davis


Collections: Geosciences