A New Mt. Logan Ice Core Record - Change in Climate and Chemistry of the Atmosphere for the North Pacific

洛根山冰芯的新记录——北太平洋气候和大气化学的变化

• 批准号: 0240878
• 负责人: Paul Mayewski
• 金额: $ 37.5万
• 依托单位: University of Maine
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-05-15 至 2006-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0240878&HistoricalAwards=false
• 关键词: New; Mt.; Logan; Ice; Core

ABSTRACTOPP-0240878MayewskiMt. Logan, in the St. Elias Range, southeast Alaska, offers a unique opportunity for monitoring climate change and change in the atmospheric chemistry of the Gulf of Alaska and the North Pacific. In 1980, a 103-meter (M) ice core was recovered from Mt. Logan which spanned AD 1689-1980. It revealed well-defined annual layers, calibrated through the identification of radioactive bomb and volcanic horizons, allowing continuous, sub-seasonal sampling for stable isotopes and ion chemistry. The -29 degree C mean annual temperature at the site assures that the soluble, insoluble, and isotopic components of the core are well preserved. In 2001 and 2002, a new ice core to bedrock (190 M) was recovered from the Prospector-Russel Col area of Mt. Logan by the Geological Survey of Canada. Based on known accumulation rates and preliminary ice flow modeling, the new ice core record may span the entire Holocene and possibly into the Late Glacial. The Principal Investigators will develop and interpret detailed time series over the last 1000-2000 years, including multi-annual to decadal, through the Holocene and perhaps into the Late Glacial for major ions, stable isotopes, trace elements, and tephra utilizing state-of-the-art technology. Intellectual Merit: Interpretations resulting from this research will invoke calibrations between ice core measurements and instrumental series of sea level pressure and temperature first defined by associations found utilizing the 1980 Mt. Logan core. These interpretations will be enhanced by state-of-the-art environmental statistics, comparison with two cores developed by collaborators working at lower elevations in the same region (King Col and Eclipse Icefield), and comparison with other paleoclimate records from the North Pacific, as well as a global array of Holocene records. The highly detailed understanding of the different controls on the upwind side of the United States and Canada, developed from the new Mt. Logan record, should contribute to understanding future change in climate. This research will contribute directly to the understanding of: 1) recent North Pacific climate variability; 2) Northern Hemisphere to global Holocene climate variability; and 3) change in the chemistry of the atmosphere.Broader Impacts: This activity builds on two decades of ice core research which focuses on understanding natural climate variability in regions that record change in major atmospheric circulation patterns and change in the chemistry of the atmosphere. This project will provide support for the activities of two young faculty members (Kreutz and Kurbatov), full support for a Ph.D. student, partial support for several undergraduate/graduate students to participate in laboratory, data interpretation, and publication activities, and a request for instrumentation to enhance University of Maine ice core capabilities and efficiency. All data and interpretations will be shared in accordance with NSF policies.

摘要-0240878 Mayewski Mt.洛根位于阿拉斯加东南部的圣埃利亚斯山脉，为监测气候变化和阿拉斯加湾和北太平洋的大气化学变化提供了独特的机会。1980年，从山上发现了一个103米(M)的冰芯。洛根，横跨公元1689-1980年。它揭示了明确的年层，通过识别放射性炸弹和火山层进行了校准，允许对稳定同位素和离子化学进行连续的亚季节采样。现场的年平均温度为-29摄氏度，这确保了核心的可溶、不溶和同位素成分得到了很好的保存。2001年和2002年，在罗素山的Prospector-Russel Col地区发现了一个新的基岩冰芯(190M)。洛根由加拿大地质调查局提供。根据已知的堆积速率和初步的冰流模型，新的冰芯记录可能跨越整个全新世，并可能持续到冰川晚期。首席调查人员将利用最先进的技术开发和解释过去1000-2000年的详细时间序列，包括从多年到十年的时间序列，从全新世到冰川晚期，以及主要离子、稳定同位素、痕量元素和火山灰的详细时间序列。智力价值：这项研究产生的解释将援引冰芯测量和海平面压力和温度的仪器系列之间的校准，这些系列首先是由利用1980年的Mt.洛根核心。这些解释将通过最先进的环境统计数据、与在同一区域低海拔地区工作的合作者开发的两个岩芯(King Col和Eclipse Icefield)的比较、与北太平洋的其他古气候记录以及全球全新世记录的比较而得到加强。对美国和加拿大迎风一侧的不同控制措施的高度详细的了解，是从新的Mt.洛根记录，应该有助于理解未来的气候变化。这项研究将直接有助于理解：1)最近北太平洋气候变率；2)北半球至全球全新世气候变率；3)大气化学变化。更广泛的影响：这项活动建立在20年来冰芯研究的基础上，该研究侧重于了解记录主要大气环流模式变化和大气化学变化的地区的自然气候变异性。该项目将为两名年轻教员(Kreutz和Kurbatov)的活动提供支持，为一名博士生提供全面支持，为几名本科生/研究生参与实验室、数据解释和出版活动提供部分支持，并要求提供仪器以增强缅因州大学ICE的核心能力和效率。所有数据和解释都将按照国家科学基金会的政策共享。