Collaborative Research: Stable Isotopes of Ice in the WAIS Divide Deep Ice Core

合作研究：WAIS 分水岭深冰芯中冰的稳定同位素

• 批准号: 0537661
• 负责人: Kurt Cuffey
• 金额: $ 9.25万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-06-01 至 2012-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0537661&HistoricalAwards=false
• 关键词: Collaborative; Research; Stable; Isotopes; Ice

This award supports analyses of stable isotopes of water, dD, d18O and deuterium excess in the proposed West Antarctic Ice Sheet Divide (WAIS) deep ice core. The project will produce a continuous and high-resolution reconstruction of stable isotope ratios for the new core. dD and d18O values provide estimates of temperature change at the ice core site. Deuterium excess provides estimates of ocean surface conditions, such as sea surface temperature, at the moisture source areas. This new ice core is ideally situated to address questions ranging from ice sheet stability to abrupt climate change. WAIS Divide has high enough snowfall rates to record climate changes on annual to decadal time scales. It should also have ice old enough to capture the last interglacial period in detail. The West Antarctic ice sheet is the subject of great scrutiny as our modern climate warms and sea level rises. What are the prospects for added sea level rise from ice released by this ice sheet? Understanding how this ice sheet has responded to climate change in the past, which the data collected in this project will help to assess, is critical to answering this question. The high temporal resolution available in the WAIS Divide core will provide the best available basis for inter-comparison of millennial-scale climate changes between the poles, and thus a better understanding of the spatial expression and dynamics of rapid climate change events. Finally, the location of this core in the Pacific sector of West Antarctica makes it well situated for examining the influence of the tropical Pacific on Antarctica climate, on longer timescales than are available from the instrumental climate record. Analyses will include the measurement of sub-annually resolved isotope variations in the uppermost parts of the core, measurements at annual resolution throughout the last 10,000 years and during periods of rapid climate change prior to that, and measurements at 50-year resolution throughout the entire length of the core that is collected and processed during the period of this grant. We anticipate that this will be about half of the full core expected to be drilled. In terms of broader impacts, the PIs will share the advising of two graduate students, who will make this ice core the focus of their thesis projects. It will be done in an innovative multi-campus approach designed to foster a broader educational experience. As noted above, the data and interpretations generated by this proposal will address climate change questions not only of direct and immediate scientific interest, but also of direct and immediate policy interest.

该奖项支持对拟议的南极西部冰原分水岭（WAIS）深冰芯中水、dD、d18O和氘过量稳定同位素的分析。该项目将为新岩心提供稳定同位素比率的连续和高分辨率重建。dD和d18O值提供了冰芯地点温度变化的估计。氘过量提供了对海洋表面条件的估计，如在湿气源区域的海面温度。这个新的冰芯位于解决从冰盖稳定性到气候突变等问题的理想位置。WAIS分水岭的降雪率足够高，可以在每年到十年的时间尺度上记录气候变化。它还应该有足够古老的冰，可以详细记录最后一次间冰期。随着现代气候变暖和海平面上升，南极西部冰盖成为人们密切关注的对象。这片冰原释放的冰对海平面上升的影响前景如何？了解这片冰盖过去是如何应对气候变化的，这个项目收集的数据将有助于评估，这对回答这个问题至关重要。WAIS分界核的高时间分辨率将为两极间千年尺度气候变化的相互比较提供最佳依据，从而更好地了解快速气候变化事件的空间表达和动态。最后，这一地核位于西南极洲的太平洋部分，这使它非常适合在比仪器气候记录提供的更长的时间尺度上研究热带太平洋对南极洲气候的影响。分析将包括测量岩心最上层的次年分解同位素变化，测量过去1万年和在此之前的快速气候变化时期的年分辨率，以及在本资助期间收集和处理的整个岩心长度的50年分辨率。我们预计这将是预计钻探的全部岩心的一半左右。就更广泛的影响而言，pi将分享两位研究生的建议，这两位研究生将把这个冰芯作为他们论文项目的重点。它将以创新的多校区方式进行，旨在培养更广泛的教育体验。如上所述，本提案产生的数据和解释将解决气候变化问题，不仅具有直接和直接的科学利益，而且具有直接和直接的政策利益。