CAREER: CLUMPMAP - Glacial Climate from Clumped Isotope Thermometry

职业：CLUMPMAP - 来自簇同位素测温的冰川气候

• 批准号: 1352212
• 负责人: Aradhna Tripati
• 金额: $ 60.6万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-04-01 至 2020-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1352212&HistoricalAwards=false
• 关键词: CAREER; CLUMPMAP; Glacial; Climate; Clumped

As a scientist and educator, the PI's lifelong career goals are to (i) develop, calibrate, and apply geochemical tools for use in paleoclimate, and better understand the diagenetic processes that can overprint proxies, (ii) improve public awareness of climate change, and the basic and social relevance of the geosciences, (iii) enhance diversity in the geosciences, and (iv) establish and maintain a leading paleoclimate program. This project seeks to further all of these objectives with an innovative program that capitalizes on her experience with one of the most exciting new tools in geology: "clumped" isotopes. Specifically the project will (i) reconstruct terrestrial climates during the Last Glacial Maximum (LGM; ~23,000-19,000 years ago), and (ii) work to educate, recruit, and retain a diverse population to the geosciences.Intellectual Merit: The project builds on the PI's recent work and describes a program termed CLUMPMAP that uses sedimentary archives to study LGM environmental change and promotes diversity in the geosciences. Changes in temperature from the LGM to recent have been studied to constrain how climate can respond to relative well-constrained forcings and as a result geologic data from LGM deposits provides valuable benchmarks for climate models. Over the next five years, the team will apply clumped isotope thermometry to carbonates and study LGM paleoclimate. This powerful new geothermometer uses the latest technology in gas-source mass spectrometry and is based on measuring the temperature-dependent 'clumping of 13C and 18O bonds in carbonate minerals. Temperature estimates also allow us to unravel the longstanding Gordian knot of carbonate 18O/16O (d18O) signatures and isolate fluid d18O. Reconstructions will be compared to climate model simulations in a manner analogous to what the PI has previously done in published studies. Thus results will provide insights into past climate variations and the processes driving them, and will be used to test the accuracy of physical representations of climate in models. Hypotheses from her recent work will be tested, focusing on role of tropospheric structure and planetary-scale atmospheric dynamics in determining the sensitivity of tropical and monsoonal climates to LGM forcings. An important aspect of this work will be assessing the reliability of model predictions of climate states that are substantially different than present.Broader impacts include: 1. Supporting the PI in expanding an integrated program of research and education, developing CLUMPMAP into a community effort and resource; 2. furthering the training and educational/career development of student and early career scientists from under-represented groups, strengthening their qualifications to continue on in higher education; 3. providing these groups with resources to conduct research with a cutting-edge technique; 4. engaging and training early career scientists and students in outreach; 5. enhancing the recruitment and retention of bright people from diverse backgrounds through the provision of role models and mentorship; 6. advancing knowledge and appreciation of geosciences amongst young people, their parents, and their teachers; 7. establishing more role models that can and should improve the present culture for under-represented groups in many institutions; 8. furthering scientific understanding of deep-time (pre-Holocene) Earth systems in areas that are relevant to improving climate models; 9. developing new collaborations with international experts and promoting the engagement and training of U.S. students and junior researchers in research, through fieldwork and collaborative visits; 10. support of a NSF- and state-funded analytical facility the PI has built; and 11. facilitating the dissemination of this technique in the fields of sedimentary geology and paleoclimate.

As a scientist and educator, the PI's lifelong career goals are to (i) develop, calibrate, and apply geochemical tools for use in paleoclimate, and better understand the diagenetic processes that can overprint proxies, (ii) improve public awareness of climate change, and the basic and social relevance of the geosciences, (iii) enhance diversity in the geosciences, and (iv) establish and maintain a leading paleoclimate 程序。该项目旨在通过一个创新的计划来进一步实现所有这些目标，该计划利用她的地质学中最令人兴奋的新工具之一来利用她的经验：“结块”同位素。具体而言，该项目将（i）在最后一次冰川最大值（LGM; 〜23,000-19，000年前）重建地面气候，并（ii）努力教育，招募和保留多样化的人口，以对地球科学进行多种多样的人群。地球科学。已经研究了从LGM到最近的温度变化，以限制气候如何响应相对受良好约束的强迫，因此，LGM沉积物的地质数据为气候模型提供了宝贵的基准。在接下来的五年中，该团队将对碳酸盐进行汇总的同位素温度计并研究LGM古气候。这种强大的新地热计使用了气源质谱法中最新技术，并基于测量碳酸盐矿物质中13C和18O键的温度依赖性'集成。温度估计还使我们能够揭开碳酸盐18o/16o（D18O）特征的长期戈尔德结和分离液D18O。将重建与气候模型模拟的重建方式类似于PI以前在已发表的研究中所做的事情。因此，结果将为过去的气候变化和驱动它们的过程提供见解，并将用于测试模型中气候物理表达的准确性。她最近的工作中的假设将进行测试，重点是对流层结构和行星尺度大气动力学在确定热带气候和季风气候对LGM强制性的敏感性方面的作用。这项工作的一个重要方面是评估与当前有根本不同的气候状态模型预测的可靠性。公民的影响包括：1。支持PI扩大研究和教育的综合计划，将ClumpMap开发为社区努力和资源； 2。从代表性不足的群体中促进学生和早期职业科学家的培训和教育/职业发展，从而增强了他们在高等教育中继续攻读的资格； 3。为这些群体提供以尖端技术进行研究的资源； 4。参与和培训早期的职业科学家和学生参加外展； 5。通过提供榜样和指导，增强来自不同背景的聪明人的招募和保留； 6。在年轻人，父母和他们的老师中促进对地球科学的知识和欣赏； 7。建立更多的榜样，可以并且应该改善许多机构中代表性不足的群体的当前文化； 8。在与改善气候模型相关的区域中对深度（千禧一代）地球系统的科学了解； 9.与国际专家开发新的合作，并通过实地调查和协作访问来促进美国学生和研究人员的参与和培训； 10。对NSF和国家资助的分析设施的支持； 11。促进在沉积地质和古气候领域的传播该技术。