High-Resolution Studies of High Arctic Paleoclimate from Varved Lake Sediments

该奖项将用于帮助从加拿大北极高地埃尔斯米尔岛北部的三个湖泊中恢复每年一次的层状(变色)沉积物，以重建过去5,000-6,000年来的晚全新世气候变化。埃尔斯米尔岛的沉积物为在一个几乎没有古气候记录的地区提供了高分辨率记录过去气候变化的机会。各沉积层的变化厚度和粒度特征反映了该地区夏季温度条件的变化。这项研究将重点放在这段时间内最温暖的时期。夏季气温变化与过去太阳总辐射变化、火山爆发事件和地球-太阳轨道几何变化之间的关系将被研究，以检验太阳强迫影响了高纬度气候的假设。这项研究将对科学界的广泛研究人员具有价值，通过研究该地区随着时间的推移温暖气候事件的频率和时间，帮助从长远的角度看待现代北极气候条件。

This award will be used to help recover annually laminated (varved) sediments from three lakes on northern Ellesmere Island in the Canadian High Arctic to reconstruct Late Holocene climate variations from the last 5,000-6,000 years. The sediments from Ellesmere Island offer the opportunity for high-resolution records of past climate variations in a region where few paleoclimatic records exist. Varve thickness and grain size characteristics of each sedimentary layer may reflect changes in summer temperature conditions in the region. The research will focus on the warmest episodes of the time period. The relationship of summer temperature changes to proxies of past changes in total solar irradiance, episodes of explosive volcanism, and variability in Earth-Sun orbital geometries will be examined to test the hypothesis that solar forcing has influenced climate at high latitudes. This research will be of value to a broad spectrum of researchers across the science community by helping place modern Arctic climate conditions in a long-term perspective by examining the frequency and timing of warm climate episodes in the region over time.