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

该奖项将用于帮助从加拿大高北极地区埃尔斯米尔岛北部的三个湖泊中恢复每年的层压沉积物，以重建过去5000 - 6000年的全新世晚期气候变化。来自埃尔斯米尔岛的沉积物提供了在一个几乎没有古气候记录的地区对过去气候变化进行高分辨率记录的机会。各沉积层厚度和粒度特征反映了该地区夏季气温条件的变化。这项研究将集中在这一时期最温暖的时期。将研究夏季温度变化与过去太阳总辐照度变化、火山爆发和地球-太阳轨道几何变率的代用物之间的关系，以检验太阳强迫影响高纬度气候的假设。这项研究将对整个科学界的广泛研究人员有价值，通过检查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.