SGER: Collaborative Research: Timing of Late Holocene Changes in Summer Indian Monsoon Intensity as Recorded in Mineralogic Changes in Speleothems, Pokhara Valley, Central Nepal

SGER：合作研究：尼泊尔中部博卡拉山谷洞穴矿物学变化记录的夏季印度季风强度的晚全新世变化时间

• 批准号: 0003266
• 负责人: Rhawn Denniston
• 金额: $ 2万
• 依托单位: Cornell College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-12-15 至 2003-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0003266&HistoricalAwards=false
• 关键词: SGER; Collaborative; Research; Timing; Late

This award is for an exploratory operation to investigate mineralogic changes in Holocene and modern speleothems from caves in the Seito River Valley, Nepal, in order to increase understanding of late Holocene Indian summer monsoon variability. In well- vented, dolomitic caves, calcite stalagmites indicate humid conditions while aragonite stalagmites record relatively arid cave conditions and accompanying in-cave evaporation. In many cases, deposition of calcite formed during precipitation-laden summer monsoons alternates with aragonite formed from reduced drip rates at the end or between monsoons. In order to better quantify the relationship between changes in speleothem mineralogy and climate, the project will perform cage fluid chemical studies (elemental and isotopic) and elemental analyses of the speleothems, as well as increase the geographic coverage of sampled caves.

该奖项是为了调查尼泊尔Seito河谷洞穴中全新世和现代洞穴沉积物的矿物学变化，以增加对晚全新世印度夏季季风变化的了解。 在通风良好的石灰岩洞穴中，方解石石笋表明潮湿的环境，而文石石笋则记录了相对干旱的洞穴环境和伴随的洞穴内蒸发。 在许多情况下，沉积的方解石形成在降水负荷的夏季季风交替与文石形成的滴水率减少年底或季风之间。 为了更好地量化洞穴沉积物矿物学变化与气候之间的关系，该项目将对洞穴沉积物进行笼式流体化学研究（元素和同位素）和元素分析，并扩大取样洞穴的地理覆盖范围。