February 28, 2007
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Published July 1988 through June 1999
FROM VOLUME 7, NUMBER 10, OCTOBER 1994
PROFESSIONAL PUBLICATIONS... PALEOCLIMATOLOGY
"Marked Post-18th Century Environmental Change in High
Arctic Ecosystems," M.S.V. Douglas (Dept. Geol., Univ.
Massachusetts, Amherst MA 01003), J.P. Smol, W. Blake Jr., Science, 266(5184),
416-419, Oct. 21, 1994.
Three high-Arctic ponds experienced unparalleled changes in
diatom assemblages beginning in the 19th century. Although
possibly related to recent climate warming, the alterations in
these seemingly pristine ponds are nevertheless dramatic; any
hopes of cataloging natural assemblages may already be fruitless.
"Climate Variations in Europe over the Past 140 kyr Deduced
from Rock Magnetism," N. Thouveny (Lab. Géol. Quaternaire,
Luminy, Case 907, 13288 Marseille Cedex 09, France), J.-L. de
Beaulieu et al., Nature, 371(6497), 503-506, Oct.
Magnetic susceptibility, pollen and organic carbon records
from maar lake deposits in the Massif Central, France, provide an
independent record of past climate. Two rapid Eemian cooling
events correlate well with the GRIP ice core, supporting other
recent evidence that rapid climate change did occur in the Eemian
interglacial and extended to continental Europe.
related items in Nature, 371(6495), Sep. 22, 1994.
"Core Correlations," R. Zahn (GEOMAR, Kiel Univ.,
D-24148 Kiel, Ger.), 289-290. Synthesizes recent findings from
ocean sediments (presented in the following two papers) and from
Greenland ice cores into the current picture of climatic
fluctuations during the last interglacial. Lake sediment results
soon to be published may resolve present ambiguities.
"The Role of the Deep Ocean in North Atlantic Climate
Change Between 70 and 130 kyr Ago," L.D. Keigwin (Woods Hole
Oceanog. Inst., Woods Hole MA 02543), W.B. Curry et al., 323-326.
Carbon and oxygen isotope analyses of benthic foraminifera in a
70-130 kyr old sediment core allowed reconstruction of the
history of north Atlantic deep water (NADW) production. In
contrast with recent ice-core data, no change in NADW production
was found during the Eemian interglacial. That apparent
instability may be an artifact caused by ice flow, or Eemian
climate instability may have had a different origin from
subsequent climate events.
"High Resolution Climate Records from the North Atlantic
During the Last Interglacial," J.F. McManus (Lamont-Doherty
Earth Observ., Palisades NY 10964), G.C. Bond et al., 326-329.
Presents records of foraminiferal assemblages and ice-rafted
detritus for 65-135 kyr ago, thus extending the surface-ocean
record to the Eemian. These records show a more stable climate
than implied by the GRIP ice core; localized phenomena may be
responsible for the variability in the latter record during the
"Greenland Ice Evidence of Hemispheric Lead Pollution Two
Millenia Ago by Greek and Roman Civilizations," S. Hong et
al., . . C.F. Boutron (Lab. Glaciol. & Geophys., CNRS, 54 rue
Molière, Domaine Univ., B.P. 96, 38402 Grenoble/St. Martin
d'Héres, France), 1841-1843.
Greek and Roman lead and silver mining and smelting polluted
the middle troposphere throughout the Northern Hemisphere.
Cumulative lead fallout to the Greenland ice sheet from 500 B.C.
to 300 A.D. was as high as 15% of that from the use of leaded
gasoline since the 1930s.
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