在普略世中期温暖时期的格陵兰岛上出现了寒冷的咒语
I M C Sousa1, C Hillaire-Marcel2, A de Vernal2
1Geotop and Département des sciences de la Terre et de l'atmosphère, Université du Québec à Montréal (UQAM), Montréal, QC, Canada. moreno_cordeiro_de_sousa.isabela@uqam.ca.
Nature communications
|February 22, 2025
概括
普略纪中期的温暖时期 (mPWP) 经历了格陵兰冰盖的增长,尽管二氧化碳的排放量很高,这主要是由于冰川侵蚀和轮流的变化. 然而,较低的轴向倾斜使其成为未来气候预测的不完美模拟.
科学领域:
- 古气候学 古气候学
- 四年纪地质学四年纪地质学
- 冰盖的动态 冰盖的动态
背景情况:
- 普略纪中期的温暖时期 (mPWP; 3.263.02万年) 经常被认为是未来气候情景和格陵兰冰盖 (GIS) 稳定的潜在类比.
- 了解过去的气候动态,特别是在高二氧化碳的温暖时期,对于预测未来的环境变化至关重要.
研究的目的:
- 调查南格陵兰边缘mPWP的气候和冰川条件.
- 评估mPWP作为GIS未来行为类比的适用性.
主要方法:
- 在海洋沉积物核心中分析和同位素.
- 从沉积物核中检查颗粒大小的数据.
- 地质证据与轨道周期 (斜率) 的相关性.
主要成果:
- 在mPWP期间,有证据表明前坎布里亚岩石的强烈冰川侵蚀,伴随着倾斜周期的节奏.
- 轮电流强度降低,也与倾斜周期有关.
- 尽管大气中二氧化碳含量高 (约400 ppmV),但在格陵兰岛上反复出现冰的增长.
结论:
- mPWP经历了足够强烈的冰增长的寒冷咒语,尽管普遍温暖的条件和高的CO2.
- 轨道强迫 (斜率) 在这个间隔期间在调节冰川活动方面发挥了重要作用.
- 该mPWP的较低的轴倾斜和由此产生的较低的阳光照射变量限制了其作为预测GIS未来命运的模拟器的直接适用性.
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