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<DIV><FONT size=2 face=Arial>Science 8 June 2012: <BR>Vol. 336 no. 6086 pp.
1242-1243 <BR>DOI: 10.1126/science.1223527 <BR><BR><FONT size=4>Dancing to the
Tune of the Glacial Cycles</FONT><BR>Naoyuki Kurita<BR>Japan Agency for
Marine-Earth Science and Technology (JAMSTEC), Yokosuka, 237-0061, Japan.E-mail:
<A href="mailto:nkurita@jamstec.go.jp">nkurita@jamstec.go.jp</A></FONT></DIV>
<DIV><FONT size=2 face=Arial><BR><STRONG>Summary</STRONG><BR>Tropical convection
acts as a heat engine that drives the world's atmospheric circulation. Any
perturbation of this force has a global influence through interaction with other
weather phenomena, such as monsoons, the El Nino/Southern Oscillation, and the
genesis of tropical cyclones. How will a possibly warmer future climate affect
tropical convective activity? On page 1301 of this issue, Meckler et
al. provide insight to this question through their analysis of an oxygen
isotope record from a stalagmite in northern Borneo, reflecting tropical Pacific
convective activity from 570,000 to 210,000 years ago. The record illustrates
how sensitive tropical convection is to variations in global climate.
</FONT></DIV><FONT size=2 face=Arial>
<DIV><BR>***********************************************<BR><BR>Science 8 June
2012: <BR>Vol. 336 no. 6086 pp. 1301-1304 <BR>DOI: 10.1126/science.1218340
</DIV>
<DIV>Published Online May 3 2012<BR><BR><FONT size=4>Interglacial Hydroclimate
in the Tropical West Pacific Through the Late Pleistocene</FONT><BR>A. N.
Meckler1,2,*, M. O. Clarkson3, K. M. Cobb4, H. Sodemann5, J. F.
Adkins1<BR>1Geological and Planetary Science Department, California Institute of
Technology, Pasadena, CA, USA. 2Geological Institute, ETH Zurich, Switzerland.
3School of Geosciences, University of Edinburgh, Edinburgh EH9 3JW, UK. 4School
of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA
30332, USA. 5Institute for Atmosphere and Climate, ETH Zurich, Switzerland. To
whom correspondence should be addressed. E-mail: <A
href="mailto:nele.meckler@erdw.ethz.ch">nele.meckler@erdw.ethz.ch</A></DIV>
<DIV><BR><STRONG>Abstract</STRONG><BR>Records of atmospheric carbon dioxide
concentration (Pco2) and Antarctic temperature have revealed an intriguing
change in the magnitude of interglacial warmth and Pco2 at around 430,000 years
ago (430 ka), but the global climate repercussions of this change remain
elusive. Here, we present a stalagmite-based reconstruction of tropical West
Pacific hydroclimate from 570 to 210 ka. The results suggest similar regional
precipitation amounts across the four interglacials contained in the record,
implying that tropical hydroclimate was insensitive to interglacial differences
in Pco2 and high-latitude temperature. In contrast, during glacial terminations,
drying in the tropical West Pacific accompanied cooling events in northern high
latitudes. Therefore, the tropical convective heat engine can either stabilize
or amplify global climate change, depending on the nature of the climate
forcing. </DIV>
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