Westerly and Laurentide ice sheet fluctuations during the last glacial maximum

IF 8.5 1区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

npj Climate and Atmospheric Science Pub Date : 2024-09-10 DOI:10.1038/s41612-024-00760-9

Hong Wang, Zhisheng An, Xu Zhang, Peixian Shu, Feng He, Weiguo Liu, Hongxuan Lu, Guodong Ming, Lin Liu, Weijian Zhou

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Abstract

The last glacial maximum (LGM) is widely acknowledged as the most recent cold period representing maximum global ice conditions. However, substantial warming is observed over Northern Hemisphere. Here, we show that the LGM climate shifted from very cold to fairly warm, followed by less cold conditions in the early Heinrich Stadial 1 (HS1) phases. Our synthesis of accurate AMS 14C dates refines the exact timing of Laurentide Ice Sheet (LIS) advances during the early LGM/HS1, constraining the chronology of the LIS decay during the late LGM. The summertime soil temperatures near ice fronts were found to increase by 1.3 °C from the early to late LGM and to decrease by 0.5 °C to the early HS1 phases, consistent with the cold-warm-cool climate patterns. The early/late LGM and early HS1 climates are found to be characterized by frequent cold/warm summers and cold winters since the world’s largest LIS began to decay.

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末次冰川极盛时期西风带和劳伦泰冰盖的波动

人们普遍认为，上一个冰川极盛时期（LGM）是最近的寒冷时期，代表了全球冰川的极盛状况。然而，在北半球却观察到了大幅度的变暖。在这里，我们展示了 LGM 气候从非常寒冷转为相当温暖，随后在海因里希恒河 1 期（HS1）早期，气候不再那么寒冷。我们综合了精确的 AMS 14C 日期，完善了劳伦特冰盖（LIS）在 LGM/HS1 早期推进的确切时间，制约了 LGM 晚期劳伦特冰盖衰减的年代学。研究发现，冰锋附近的夏季土壤温度从LGM早期到晚期上升了1.3 °C，到HS1早期下降了0.5 °C，与冷-暖-冷气候模式一致。研究发现，自世界上最大的陆相沉积系统开始衰减以来，LGM 早期/晚期和 HS1 早期气候的特点是夏季寒冷/温暖，冬季寒冷。

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来源期刊

npj Climate and Atmospheric Science Earth and Planetary Sciences-Atmospheric Science

CiteScore

8.80

自引率

3.30%

发文量

审稿时长

21 weeks

期刊介绍： npj Climate and Atmospheric Science is an open-access journal encompassing the relevant physical, chemical, and biological aspects of atmospheric and climate science. The journal places particular emphasis on regional studies that unveil new insights into specific localities, including examinations of local atmospheric composition, such as aerosols. The range of topics covered by the journal includes climate dynamics, climate variability, weather and climate prediction, climate change, ocean dynamics, weather extremes, air pollution, atmospheric chemistry (including aerosols), the hydrological cycle, and atmosphere–ocean and atmosphere–land interactions. The journal welcomes studies employing a diverse array of methods, including numerical and statistical modeling, the development and application of in situ observational techniques, remote sensing, and the development or evaluation of new reanalyses.