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Holocene Paleoclimatic History of the Rainfall Gradient in the Southern Great Plains: Evidence from Stable Isotopes in Land Snail Shells

南部大平原降雨梯度的全新世古气候历史：来自蜗牛壳中稳定同位素的证据

基本信息

批准号：
9510869
负责人：
Glenn Goodfriend
金额：
$ 11.18万
依托单位：
Texas Historical Commission
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1995
资助国家：
美国
起止时间：
1995-09-15 至 1999-02-28
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9510869&HistoricalAwards=false
关键词：
Holocene Paleoclimatic History Rainfall Gradient

项目摘要

SBR-9510869 Glenn A. Goodfriend, Principal Investigator (PI) G.L. Ellis, Co-PI Texas Historical Commission Holocene Paleoclimatic History of the Rainfall Gradient in the Southern Great Plains The Great Plains represent the climatic transition between moist eastern and semiarid western North America. This project investigates the climate history of this rainfall gradient in the southern Great Plains over the course of the Holocene (the period following the end of the last ice age or the last 10,000 years). The paleoclimate reconstruction is based on the stable isotope composition of the carbonate fraction of shells of the land snail, Rabdotus, which is abundant in the late Quaternary record of the region. Samples from four Texas sites spanning the modern rainfall gradient in the region are analyzed for stable carbon and oxygen isotope ratios. These ratios serve as proxies for determining plant types and seasonal variations in temperature. Documenting the recent history (last 10,000 years) of this rainfall gradient is of critical importance in evaluating paleoclimatic models of the Holocene and understanding how the gradient could change in the future in response to human-induced modifications. The data also provides a basis for reinterpreting and refining current understanding of the patterns of cultural adaptation in the region.

SBR-9510869 Glenn A. Goodfriend，首席研究员 (PI) G.L. Ellis，联合 PI 德克萨斯州历史委员会全新世古气候南部大平原降雨梯度历史大平原代表了北美湿润东部和半干旱西部之间的气候过渡。该项目调查全新世（最后一个冰河时代结束后的时期或过去一万年）期间大平原南部降雨梯度的气候历史。古气候重建基于陆生蜗牛 Rabdotus 贝壳碳酸盐部分的稳定同位素组成，该区域在第四纪晚期的记录中含量丰富。对来自德克萨斯州四个地点跨越该地区现代降雨梯度的样本进行了稳定碳和氧同位素比的分析。这些比率可以作为确定植物类型和温度季节变化的代理。记录该降雨梯度的近期历史（过去一万年）对于评估全新世的古气候模型以及了解梯度在未来如何因人类引起的变化而变化至关重要。这些数据还为重新解释和完善当前对该地区文化适应模式的理解提供了基础。