...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Paleolimnology >Insolation forcing of Holocene climate change in Southern California: a sediment study from Lake Elsinore
【24h】

Insolation forcing of Holocene climate change in Southern California: a sediment study from Lake Elsinore

机译：南加州全新世气候变化的强迫强迫作用：来自埃尔西诺湖的沉积物研究

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

Lake Elsinore is the largest natural lake in Southern California. As such, the lake provides a unique opportunity to investigate terrestrial climate on timescales otherwise underrepresented in the region’s terrestrial environment. In November 2003, three ～10 m drill cores were extracted from the depocenter region of Lake Elsinore. These drill cores, spanning the past 9,500–11,200 calendar years, represent the first complete Holocene record of terrestrial climate from Southern California. In this paper, we focus on two adjacent, depocenter cores (LEGC03-2 and LEGC03-3), which have been correlated to develop a single composite core. Twenty-two AMS 14C dates on bulk organic matter and one cross-correlated exotic pollen age constitute the composite core’s age control. Several methods of analysis, including mass magnetic susceptibility, % total organic matter, % total carbonate, % HCl-extractable Al, and total inorganic P are used to infer climate for the past 9,500 calendar years in Southern California. Together, these data indicate a wet early Holocene followed by a long-term drying trend. Recent lake-level reconstructions from Owens Lake and Tulare Lake support our contention for a wetter-than-today early Holocene. Lacustrine sediments from the Mojave Desert also support our conclusions. We suggest that over the duration of the Holocene changing summer/winter insolation alters the region’s long-term hydrologic balance through its modulation of atmospheric circulation and its associated storm tracks. Minimum early Holocene winter insolation and maximum summer insolation act together to increase the region’s total annual precipitation by increasing the frequency of winter storms as well as enhancing the magnitude and spatial extent of the North American monsoon, the frequency of land-falling tropical cyclones in Southern California, and regional convective storms, respectively. Gradual decreases in summer insolation and increases in winter insolation produce the opposite effect with maximum drying in the late Holocene.
机译：埃尔西诺湖是南加州最大的天然湖泊。因此，该湖泊提供了一个独特的机会，可以按时标来调查该地区的陆地气候，否则该时间尺度将在该地区的陆地环境中得到体现。 2003年11月，从Elsinore湖沉积中心地区提取了3〜10 m的岩心。这些钻芯跨越了过去的9,500–11,200个日历年，代表了南加利福尼亚州第一个完整的全新世陆地气候记录。在本文中，我们着重研究两个相邻的沉积中心核（LEGC03-2和LEGC03-3），它​​们相互关联以开发单个复合核。 22个AMS 14 C日期涉及大量有机物，一个相互关联的奇异花粉年龄构成了复合核心的年龄控制。几种分析方法，包括质量磁化率，总有机物百分比，总碳酸盐百分比，可提取HCl的Al百分比和无机磷总量，可用于推断南加州过去9500历年的气候。这些数据加在一起表明，全新世早期处于潮湿状态，随后出现了长期干燥的趋势。最近从欧文斯湖和图莱里湖进行的湖级重建支持了我们对今天较湿的全新世的争论。来自莫哈韦沙漠的Lacustrine沉积物也支持我们的结论。我们建议，在全新世期间，夏季/冬季的日照变化会通过对大气环流及其相关风暴路径的调节来改变该地区的长期水文平衡。全新世的冬季最小日照量和夏季最大的日照量共同作用，通过增加冬季暴风雨的频率以及增强北美季风的强度和空间范围来增加该地区的年降水量，而北美季风的数量和空间范围是南部陆地降落的热带气旋的频率分别是加利福尼亚州和区域性对流风暴。夏季日照逐渐减少，冬季日照逐渐增加，产生了相反的效果，在全新世晚期达到最大干燥度。

著录项

  • 来源
    《Journal of Paleolimnology》 |2007年第3期|395-417|共23页
  • 作者

    Matthew E. Kirby; Steve P. Lund; Michael A. Anderson; Broxton W. Bird;

  • 作者单位

    Department of Geological Sciences California State University Fullerton Fullerton CA 92834 USA;

    Department of Earth Sciences University of Southern California Los Angeles CA 90089 USA;

    Department of Environmental Sciences University of California Riverside Riverside CA 92521 USA;

    Department of Geological Sciences California State University Fullerton Fullerton CA 92834 USA;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Holocene; Lake Elsinore; Sediments; Insolation;

    机译：全新世;Elsinore湖;沉积物;日射;

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