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2005年02月24日

【期刊论文】GIS-assisted spatially distributed modeling of the potential evapotranspiration in semi-arid climate of the Chinese Loess Plateau

冯兆东, Zhao Chuanyana, *, Nan Zhongrena, Feng Zhaodonga, b

Journal of Arid Environments 58 (2004) 387-403,-0001,():

-1年11月30日

摘要

Understanding potential evapotranspiration (PET) is essential in planning economic uses of water resource and in assessing the potential ecological conditions for ecological restoration. In the semi-arid western Chinese Loess Plateau. This work tested three models commonly used to estimate monthly PET rate (i.e. Behnk-Maxey, Prestley-Taylor and Hargreaves). The major purposes are: (1) to determine the model used to calculate PET with small data requirements and high accuracy in the Zuli River Basin; and (2) to calculate the areal distribution of potential evapo-transpiration in the study area. From the approach, conclusion can be drawn that Hargreaves model may be the best way to estimate PET in the semi-arid area of the Loess Plateau with sparsity of weather stations. The general methods described here are expected to be applicable to the entire Loess Plateau.

Potential evapotranspiration, Zuli River Basin, Linear regression, Hargreaves equation, Loess Plateau

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2005年02月24日

【期刊论文】Holocene abrupt climate shifts recorded in Gun Nuur lake core, northern Mongolia

冯兆东, WANG Weiguo, FENG Zhaodong, LEE Xinqing, ZHANG Hucai, MA Yuzhen, AN Chenbang & GUO Lanlan

Chinese Science Bulletin 2004 Vol. 49 No.5 520-526,-0001,():

-1年11月30日

摘要

A continuous 7.44 m lake core was successfully drilled at Gun Nuur Lake, northern Mongolia, and analyses on environment magnetic parameters, organic matter content and organic δ13C were conducted in an attempt to retrieve the Holocene chronosequence of climatic changes based on 6 AMS 14C dates. We found that the Holocene climate in northern Mongolia has been alternating between cold (or cool)/wet conditions and warm/arid conditions, and also punctuated with a series of abrupt climate shifts. The abrupt climate shifts occurred around 1750, 2800, 4000, 5200, 7200, and 9200 aBP (14C age), being chronologically correlative to those abrupt climatic events recorded in the highlatitude North Atlantic Ocean. The correlation indicates that the climatic changes in northern Mongolia were linked with those in the North Atlantic Ocean probably via the North Atlantic Oscillation-affected westerly winds. The strength and position of westerly winds might have modulated the Siberian-Mongolian high pressure system (winter monsoon), directly influencing the climate in China.

Mongolian Plateau,, Holocene,, Gun Nuur Lake,, abrupt climatic event.,

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2007年12月27日

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2007年12月27日

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2005年02月24日

【期刊论文】Lacustrine and eolian records of Holocene climate changes in the Mongolian Plateau: preliminary results

冯兆东, Z.-D. Fenga, b, W.G. Wanga, L.L. Guoa, P. Khosbayarc, T. Narantsetsegc, A.J.T. Julld, C.B. Ana, X.Q. Lia, H.C. Zhanga, Y.Z. Maa

,-0001,():

-1年11月30日

摘要

This study compares two pairs of adjacent lacustrine and eolian sections at sites in the southern and northern Mongolian Plateaus in order to test spatial climate variability during the Holocene. Based on the lithology, proxy data, and 14C dated and the interpolated ages, the following observations can be made. In the northern Mongolian Plateau, a best developed Holocene paleosol dated at 8672 14Cyr BP at the Shaamar section and the carbonate-rich laminated layer in the Gun Nuur lake core mark the interval of warmer and dryer climate during the early Holocene. Younger paleosols at the Shaamar section and corresponding organic-rich layers in the Gun Nuur core were formed under distinctly cooler and more humid conditions. The Baahar Nuur lake core in the southern Mongolian Plateau and the Dingxi-type section in the northern part of the Western Chinese Loess Plateau appear to indicate that a prolonged interval of maximum humidity prevailed in this region during the early and mid-Holocene (9000-4000 14Cyr BP). By contrast, in the northern Mongolian Plateau the most humid conditions seem to have occurred from 4500 to 2500 (possibly to 1650) 14Cyr BP. This discrepancy implies that the concept of the Holocene climatic optimum has limitations and may have to be reconsidered if it is intended to have a large-scale connotation.

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    兰州大学,甘肃

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