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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Mineral magnetism and other characteristics of sediments from a sub-alpine lake (3080 m a.s.l.) in central east China and their implications on environmental changes for the last 5770 years
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Mineral magnetism and other characteristics of sediments from a sub-alpine lake (3080 m a.s.l.) in central east China and their implications on environmental changes for the last 5770 years

机译：过去5770年华东中部亚高山湖泊（3080 m a.s.l.）的矿物质磁性和其他沉积特征及其对环境变化的影响

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A sediment sequence (SQC07) was recovered from Sanqing Chi, a small sub-alpine lake (3080 m a.s.l.) on Taibai (3767 m a.s.l.), the highest mountain in east mainland China (east of 105 degrees). The Mountain is also the highest part and central massif of the Qinling Mountain Range functioning as the boundary between the warm temperate climate zone to the north and sub-tropical climate zone to the south in east China. Soils and debris were also sampled from the catchment of Sanqing Chi. SQC07 was AMS C-14 dated. Mineral magnetism was measured for the sediment sequence and catchment samples. Particle-size, TOC and TN analysis were undertaken on SQC07, while pollen analysis was made for the sediment sequence and surface-soil samples. With the mineral magnetism of the catchment materials, the magnetic and other characteristics of SQC07 indicate the environmental changes occurring on the high altitudes of Taibai Mountain during the past 5770 years. Environments were still moderately warm and wet over 5770-5100 cal. yr BP around this sub-alpine lake. Then cold and dry conditions persisted in the period of 5100-4000 cal. yr BP. Local environments began to ameliorate from 4000 cal. yr BP onwards and were thus generally warm and wet over 4000-1200 cal. yr BP. The warmth and wetness culminated in 1200-800 cal. yr BR During the period of 800-400 cal. yr BP, cold and arid conditions again predominated. Environments have subsequently become warm and humid since similar to 400 cal. yr BR The overall trend of the changes is coincident with what have been identified at several other sites in east mainland China and Taiwan. Presumably, the deterioration over 5100-4000 cal. yr BP marks the termination of the Holocene optimum, corresponds to or encompasses Holocene event 3, while the deterioration occurring in 800-400 cal. yr BP may correspond to LIA cooling. However, they appear to have commenced earlier than the aforementioned sites at relatively low altitudes in east mainland China or even higher altitudes but far southeast in Taiwan. These differences are possibly caused partly by uncertainties and/or errors of chronologies. Nevertheless, they also could be attributed to the spatial variability of East Asian monsoon and/or earlier responses of local landscapes around Sanqing Chi to larger-scale climate-deterioration. (C) 2016 Elsevier B.V. All rights reserved.
机译：沉积物序列（SQC07）是从中国东部大陆最高的山脉（105度以东）太白（3767 m a.s.l.）上的一个小型亚高山湖泊（3080 m a.s.l.）的三清池中获得的。该山也是秦岭山脉的最高部分和中部地块，是中国东部北部温带温带气候区和南部南部亚热带气候区之间的边界。还从三清池流域采样了土壤和碎片。 SQC07是AMS C-14发行的。测量了沉积序列和集水区样品的矿物磁性。在SQC07上进行了粒度，TOC和TN分析，同时对沉积物序列和表层土壤样品进行了花粉分析。利用集水材料的矿物磁性，SQC07的磁性和其他特征指示了过去5770年内太白山高海拔地区发生的环境变化。在5770-5100 cal以上，环境仍然温暖和潮湿。 BP在这个亚高山湖泊周围。然后，寒冷和干燥的条件持续了5100-4000 cal。年BP。从4000卡开始，当地环境开始改善。 BP开始，因此在4000-1200 cal范围内普遍温暖和潮湿。年BP。温暖和潮湿最终达到1200-800摄氏度。年BR在800-400 cal期间。在BP，寒冷和干旱的条件再次占主导地位。自从接近400卡路里以来，环境随后变得温暖潮湿。年BR变化的总体趋势与中国大陆东部和台湾其他几个地点的变化相吻合。据推测，其劣化超过5100-4000 cal。 yr BP标志着全新世最优的终止，相当于或涵盖了全新世事件3，而恶化发生在800-400 cal中。 BP可能对应于LIA冷却。但是，它们似乎早于上述地点，在中国大陆东部相对较低的海拔或什至在台湾东南部较高的海拔开始。这些差异可能部分是由时间的不确定性和/或错误引起的。然而，它们也可以归因于东亚季风的空间变异性和/或三清池周围局部景观对大规模气候恶化的早期反应。 （C）2016 Elsevier B.V.保留所有权利。

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