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

abstractopp mayewskimt——0240878。洛根位于阿拉斯加东南部的圣埃利亚斯山脉，为监测气候变化以及阿拉斯加湾和北太平洋的大气化学变化提供了一个独特的机会。1980年，从洛根山上发现了一个103米(M)的冰芯，时间跨度为公元1689年至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校准，允许连续的、分季节的稳定同位素和离子化学取样。该地点年平均温度为-29摄氏度，确保了岩心的可溶性、不可溶性和同位素成分得以完好保存。2001年和2002年，加拿大地质调查局在洛根山的探矿者-罗素科尔地区发现了一个新的冰芯到基岩（190 M）。根据已知的累积速率和初步的冰流模拟，新的冰芯记录可能跨越整个全新世，甚至可能进入晚冰期。首席研究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，从全新世到晚冰期的主要离子、稳定同位素、微量元素和碲。知识价值：从这项研究中得出的解释将调用冰芯测量和海平面压力和温度的仪器系列之间的校准，这些仪器系列首先由利用1980年洛根山岩芯发现的协会定义。这些解释将通过最先进的环境统计数据、与在同一地区低海拔地区（King Col和Eclipse冰原）合作开发的两个岩心进行比较、与北太平洋的其他古气候记录以及全球全新世记录进行比较来加强。从新的洛根山记录中得到的对美国和加拿大逆风侧不同控制的非常详细的了解，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)近期北太平洋气候变率；2)北半球到全球全新世气候变率；3)大气化学成分的变化。更广泛的影响：这项活动建立在20年冰芯研究的基础上，该研究的重点是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率。该项目将为两名年轻教师（Kreutz和Kurbatov）的活动提供支持，为一名博士生提供全额支持，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，并请求提供仪器以提高缅因大学冰芯的能力和效率。所有的数据和解释将按照国家科学基金会的政策共享。

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.