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The Medieval Warm Period in the Daihai Area
Jin, Z | Shen, J | Wang, S | Zhang, E
Journal of Lake Sciences [J. Lake Sci.]. Vol. 14, no. 3, pp.
209-216. Sep 2002.
Based on the rubidium to strontium (Rb/Sr) ratio, carbonate (CaCO
sub(3)) content and organic carbon concentration (C sub(org))
record in lake sediments from the Daihai Lake, Inner Mongolia,
dated by AMS- super(14)C and super(210)Pb, the climatic and
environmental change process was reconstructed since the last
2,200 years, including two important climate events, i. e. the
Medieval Warm Period and Little Ice Age. An increase Rb/Sr ratio
but a decrease both CaCO sub(3) and C sub(org) correspond to a
cold period, and vice versa. In this paper, we first suggest that
there existed the Medieval Warm Period in the northern China
during 900-1200a B. P. by a high-resolution lake record
characterized according to lower Rb/Sr ratios and higher CaCO
sub(3) and C sub(org) concentrations in the sediments from a
single watershed, which a warm and humid environment was
demonstrated by significant increase of chemical weathering and by
a progressive increase of biologic productivity, and by a high
lake level. The Medieval Warm Period has not only an inner
climatic fluctuant, but also the strongest chemical weathering
during the last 2,200 years, which are indicated by a
higher-resolution natural record in northern China. Furthermore,
the Medieval Warm Period in northern China is contemporaneous with
the worldwide event identified in the lakes, oceans, land mollusk
sequences, polar ice cores, pollens and historical documents.
 Descriptors: Article Subject Terms Carbonates | Climatic Changes | Climatic changes | Ice
ages | Isotope Studies | Lacustrine sedimentation | Lake Sediments | Lake deposits | Lake sediment dating | Lakes | Little Ice Age | Palaeo
studies | Paleoclimates | Paleoclimatology | Ratios | Weathering | Article Geographic Terms China, People's Rep., Inner Mongolia, Daihai L. | China, People's Rep., Nei Monggol, Daihai Hu L.
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