Strong summer monsoon during the cool MIS-13 Q. Z. Yin1,2 and Z. T. Guo1 1Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China 2Institut d'Astronomie et de Géophysique G. Lemaître, Université catholique de Louvain, Chemin du Cyclotron 2, 1348 Louvain-La-Neuve, Belgium
Abstract. The δ18O record in deep-sea sediments show a significant
reduced amplitude of the ice volume variations before Marine Isotope Stage
11, about 400 ka ago, with less warm interglacials and less cold glacials.
The deuterium temperature and the greenhouse gases records in the Antarctic
ice cores show the same feature. As the reduction in the amplitude of
climate and greenhouse gases concentration variations before 400 ka BP is
present in both deep-sea and ice cores, it is tempting to conclude that this
is a worldwide phenomenon. This is not necessarily true, at least as far as
some of the records, in particular of China and Europe, are concerned. The
loess in northern China, the sedimentary core in the eastern Tibetan Plateau
and the palaeosols in southern China all record an unusually warm and wet
climate during Marine Isotope Stage 13, indicating an extremely strong East
Asian summer monsoon. The pollen record from Europe shows that the climatic
conditions during the interglacials previous to Marine Isotope Stage 11 are
at least as warm as the younger interglacials. During Marine Isotope Stage
13, unusually strong African and Indian monsoon are recorded in the
sediments of the equatorial Indian Ocean and of the Mediterranean Sea. Other
extreme climate events are also recorded in sediment cores of the equatorial
Atlantic, the Pacific, the subtropical South Atlantic Ocean and in the Lake
Baikal of Siberia.
Citation: Yin, Q. Z. and Guo, Z. T.: Strong summer monsoon during the cool MIS-13, Clim. Past, 4, 29-34, doi:10.5194/cp-4-29-2008, 2008.