High elevation ice patch documents Holocene climate variability in the northern Rocky Mountains
High elevation ice patch documents Holocene climate variability in the northern Rocky Mountains
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DOI：
10.1016/j.qsa.2020.100021
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发表时间：
2021-04
期刊：
影响因子：
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通讯作者：
N. Chellman;G. Pederson;Craig M. Lee;D. McWethy;Kathryn Puseman;J. Stone;Sabrina R. Brown;J. McConnell-J.
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文献类型：
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作者：
N. Chellman;G. Pederson;Craig M. Lee;D. McWethy;Kathryn Puseman;J. Stone;Sabrina R. Brown;J. McConnell-J.
冰芯的古气候记录通常被认为是环境变化最直接的指标，但在美国西部等中纬度大陆地区很少见。众所周知，高海拔冰块是高山地区重要的考古档案，有可能为地球系统模型评估和了解气候与早期人类活动之间的联系提供重要记录，但这种潜力很大程度上尚未被开发。在这里，我们使用来自浅冰块的日期明确的冰芯记录来研究全新世期间落基山的冬季气候。我们的记录表明，这片冰块在过去 10 公里内持续积冰，保留了具有区域代表性的稳定水同位素和冰积聚率气候记录，记录了全新世早期普遍较凉爽和湿润的条件，以及以 4100calyr BP 为中心的 500 年异常冬季温暖，随后迅速降温和 1500 年凉爽和湿润的冬季。
Paleoclimate records from ice cores generally are considered to be the most direct indicators of environmental change, but are rare from mid-latitude, continental regions such as the western United States. High-elevation ice patches are known to be important archaeological archives in alpine regions and potentially could provide records important for Earth System Model evaluation and to understand linkages between climate and early human activities, but this potential largely is unexplored. Here we use a well-dated ice-core record from a shallow ice patch to investigate Rocky Mountain winter-season climate during the Holocene. Our records indicate that this ice patch consistently accumulated ice over the past 10 kyr, preserving a regionally representative climate record of stable water isotopes and ice accretion rates that documented generally cooler and wetter conditions during the early Holocene and 500 years of anomalous winter season warmth centered at 4100 cal yr BP followed by a rapid cooling and 1500 years of cooler and wetter winters.