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The 'Mediaeval Warm Period' drought recorded in Lake Huguangyan,
tropical South China
Chu, Guoqiang | Liu, Jiaqi | Sun, Qing | Lu, Houyuan | Gu, Zhaoyan | Wang, Wenyuan | Liu, Tungsheng
Holocene [Holocene]. Vol. 12, no. 5, pp. 511-516. 2002.
The geochemistry of dated sediment cores from Lake Huguangyan (21
degree 9'N, 110 degree 17'E), tropical South China, reveals
distinct stratigraphical patterns in total organic and inorganic
carbon (TOC, TIC), biogenic silica (BS) and total nitrogen (TN)
over the past 1400 years. In this hydrologically closed lake, TIC
variations may reflect changes in the precipitation/evaporation
ratio, which controls the evaporative enrichment of carbonate.
TOC, BS and TN in the sediment are proxy indicators of lake
productivity and nutrient input, which we believe are linked to
local precipitation. High TIC content correlates with low
concentrations of TOC, BS and TN, and indicates two drought
episodes dated to AD 670-760 and AD 880-1260 in the sediments of
Lake Huguangyan. Local historical chronicles support these data,
suggesting that the climate of tropical South China was dry during
the 'Mediaeval Warm Period' (MWP) and wet during the 'Little Ice
Age' (LIA). The detected MWP drought is temporally correlated with
evidence for lower precipitation on the Guliya (China) and
Quelccaya (Peru) ice caps, and with increased salinity in Moon
Lake (US Great Plains).
 Descriptors: Article Subject Terms Drought | Geochemistry | Historic droughts | History | Hydrologic Data | Lake core analysis | Lake sediment composition | Little Ice Age | Organic carbon in lake water | Sediments | Article Geographic Terms China, People's Rep., South | Peru | USA, North Dakota,
Moon L.
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