Collaborative Research: Analysis of McCall Glacier Ice Core and Related Modern Process Studies

这是一个涉及四个机构的合作项目。本文提出的研究解决了与阿拉斯加东部北极地区气候相关的两个主要问题：1)基于麦考尔冰川的冰芯重建，该地区在过去250年中气候、陆地生态和污染物运输是如何变化的？2)通过现代过程研究，我们能在多大程度上克服来自小型多热山谷冰川冰芯的代用解释的挑战？为了回答这些问题，研究人员对冰芯代用物、大气动力学、现代过程和数值冰流模型进行了跨学科分析。一个152米长的岩心已经钻过了麦考尔冰川，并分析了35种化学指标。拟议的工作将集中在1)解释这些代理,2)分析花粉的核心,3)过程的研究来识别来源的花粉考尔冰川,4)把过去50年的天气和气候记录上部分的核心,5)持续3 d冰川流建模和当地天气观测,6)进行现代过程调查的影响季节性融化的一代核心代理记录。该项目将资助两名研究生。

This is a collaborative project involving four institutions. The proposed research addresses two major questions related to climate in the eastern Alaskan Arctic: 1) How has climate, terrestrial ecology, and pollutant transport changed over the past 250 years in this region, based on ice core reconstructions from McCall Glacier? and 2) How well can we overcome the challenges of core proxy interpretations from ice cores taken from small polythermal valley glaciers through modern-process studies? To answer these questions the investigators conduct an inter-disciplinary analysis of ice core proxies, atmospheric dynamics, modern processes, and numerical ice flow modeling. A 152-meter long core has already been drilled through McCall Glacier and analyzed for 35 chemical proxies. The proposed work will focus on 1) interpretation of these proxies, 2) analysis of pollen in the core, 3) process studies to identify sources of pollen to McCall Glacier, 4) tying the weather and climate record of the past 50 years to the upper section of the core, 5) continuing 3D flow modeling of the glacier and local weather observations, 6) conducting modern process investigations of the effects of seasonal melt on the generation of the core proxy record. The project will support two graduate students.