• 主题
高级搜索  >
历史搜索 清空历史
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 >Transition from a warm and dry to a cold and wet climate in NE China across the Holocene
【24h】

Transition from a warm and dry to a cold and wet climate in NE China across the Holocene

机译：从温暖和干燥到全新世的奈斯中国寒冷，潮湿的气候

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Northeast (NE) China lies in the northernmost part of the East Asian Summer monsoon (EASM) region. Although a series of Holocene climatic records have been obtained from lakes and peats in this region, the Holocene hydrological history and its controls remain unclear. More specifically, it is currently debated whether NE China experienced a dry or wet climate during the early Holocene. Here we reconstruct changes in mean annual air temperature and peat soil moisture across the last similar to 13,000 year BP using samples from the Gushantun and Hani peat, located in NE China. Our approach is based on the distribution of bacterial branched glycerol dialkyl glycerol tetraethers (brGDGTs) and the abundance of the archaeal isoprenoidal (iso)GDGT crenarchaeol. Using the recently developed peat-specific MAAT(p)(eat) temperature calibration we find that NE China experienced a relatively warm early Holocene (similar to 5-7 degrees C warmer than today), followed by a cooling trend towards modern-day values during the mid- and late Holocene. Moreover, crenarchaeol concentrations, brGDGT-based pH values, and the distribution of 6-methyl brGDGTs, all indicate an increase in soil moisture content from the early to late Holocene in both peats, which is largely consistent with other data from NE China. This trend towards increasing soil moisture/wetter conditions across the Holocene in NE China records contrasts with the trends observed in other parts of the EASM region, which exhibit an early and/or mid-Holocene moisture/precipitation maximum. However, the Holocene soil moisture variations and temperature-moisture relationships (warm-dry and cold-wet) observed in NE China are similar to those observed in the core area of arid central Asia which is dominated by the westerlies. We therefore propose that an increase in the intensity of the westerlies across the Holocene, driven by increasing winter insolation, expanding Arctic sea ice extent and the enhanced Okhotsk High, caused an i
机译：东北（NE）中国位于东亚夏季季风（EASM）地区的最北端。尽管在该地区的湖泊和泥炭中获得了一系列全茂气候记录，但全新世水文史及其对照仍然不清楚。更具体地说，目前在全新世时代中国中国中国是否经历了干燥或潮湿的气候。在这里，我们将在历史上，使用GuShantun和Hani Peat的样本来重建平均年度空气温度和泥炭土壤水分的变化，使用Gustantun和Hani Peat，位于NE中国。我们的方法是基于细菌支化甘油二烷基甘油四乙酯（BRGDGT）的分布和古代异常（ISO）GDGT Crenarchaeol的丰度。使用最近开发的泥炭特异性MAAT（P）（饮食）温度校准，我们发现NE中国经历了相对温暖的全新世（与今天的5-7摄氏度类似），其次是现代值的冷却趋势在全新世中期和晚期和晚期。此外，Crenarchaeol浓度，BRGDGT基的pH值和6-甲基BRGDGT的分布，所有这些都表明了两种泥炭上的早期全新世的土壤水分含量增加，这与来自NE中国的其他数据相一致。这一趋势在纳米中国全新世中增加土壤湿度/湿润的条件与EASM地区其他部分观察到的趋势形成鲜明对比，其表现出早期和/或中全新卫生水/降水最大值。然而，在NE中国观察到的全茂性水分变化和温度 - 水分关系（温湿冷湿）与在干旱中亚的核心区观察到的人，这些内亚的核心区是由港口主导的。因此，我们建议通过增加冬季缺失，扩大北极海冰范围和增强的Okhotsk高，推动了全新世的西风强度的增加。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号