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|Title: ||Periodic enhanced rainfalls in Lanyang Plain during the past 1,300 years;Amultiproxy record from Mei-Hwa Lake|
|Authors: ||Yang T.N.;Wei k.Y.;Lee T.Q.;Lin S.F.;Chen H.F.;Song S.R.;Chen Y.G.|
|Contributors: ||NTOU:Institute of Applied Geosciences|
|Issue Date: ||2011-10-20T08:17:46Z
|Publisher: ||Workshop on Climate and Environmental Changes in East Asia Science the Last 2,000 Years|
|Abstract: ||To explore the late Holocene climatic/hydrological changes in northeastern Taiwan, from the Mei-Hwa Lake, Ilan County, a 28 m lacustrine sedimentary core was retrieved. The lake, a cove basin next to an alluvial-fan margin of the Lo-Tong River, is located at 50 m a.b.s.l., and has an area of 18.2 ha and water depth shallower than 2 m. A detailed chronology covering the last 5000 years was established using 10 C-14 dating points evenly distributed in the core. In this study we focus on only the top 5.2 meters of the core because the record appears to be interrupted at 5.2-6.0 m by the presence of several layers of well-sorted, coarse-grained slate grains.
During the past 1300 years, signals of high Corganic/Ntotal ratio (C/N) and organic carbon content are inferred to be indicative of larger input of terrestrial organic matters brought in by intensified runoff from the drainage area. Such intervals are generally also accompanied by high S-ratio and low abundance of oxidized magnetic minerals (hematite). Based upon these multiple proxies we have identified 7 intervals of enhanced precipitation during the past 1300 years with a periodicity of about 180 years. Inferred from the elevated values of δ13C of bulk organic matter, the C4 plants became more dominant during 100-180 years and 330-400 years ago, corresponding to the last two enhanced precipitation intervals, respectively.
|Appears in Collections:||[應用地球科學研究所] 演講及研討會|
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