冰山分娩行为的变化在最后一次除冰期期间北海冰架解体之前发生
James D Kirkham1,2, Kelly A Hogan3, Robert D Larter3
1British Antarctic Survey, High Cross, Cambridge, UK. jamkir56@bas.ac.uk.
Nature communications
|April 24, 2025
概括
边缘英国-爱尔兰冰盖 (BIIS) 的冰架在18000年前解体. 这种向较小冰山的转变与冰盖的崩相吻合,可能是由表面融化和水力压裂引发的.
科学领域:
- 冰川学的冰川学
- 气候科学 气候科学
- 地质形态学 地质形态学
背景情况:
- 冰架的稳定性对于南极冰盖 (AIS) 的支和海平面上升至关重要.
- 了解冰山分娩模式的变化对于预测冰架的行为和稳定性至关重要.
- 英国-爱尔兰冰盖 (BIIS) 历史提供了对过去冰架动态的见解.
研究的目的:
- 调查BIIS解体期间冰山分娩制度的变化.
- 为了确定BIIS冰架崩的时间和机制.
- 评估分娩模式转变对冰架稳定性和冰退的影响.
主要方法:
- 对埋藏的地形进行分析,以重建过去的冰架范围.
- 地质证据的年代测定,以确定冰架解体的时间表.
- 解读冰山大小的变化,以推断产卵周期的变化.
主要成果:
- 有证据表明BIIS边缘有大量的冰架.
- 大规模的表状冰山 (宽5-10公里,厚50-180米) 产生直到18000年前.
- 转向更小的冰山产量与广泛的冰架解体和海洋冰层崩相吻合.
结论:
- BIIS经历了大约18卡的气候值,导致其冰架的大规模表面融化.
- 裂的水力压裂可能引发了冰架的解体,并增加了冰的退缩速度.
- 产卵周期的变化会对冰架稳定性和冰盖动态产生重大影响.
相关概念视频
01:50Global Climate Change
23.9K
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
23.9K
00:53Migration
7.8K
Migration is long-range, seasonal movement from one region or habitat to another. This common strategy, carried out by many different organisms around the world, is an adaptive response that typically corresponds to changes in an organism’s environment, like resource availability or climate. Migrations can involve huge groups of thousands of animals as well as single individuals traveling alone and can range from thousands of kilometers to just a few hundred meters.
7.8K
01:06Primary Production
23.4K
The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
23.4K
02:04Conservation of Small Populations
13.0K
Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less...
13.0K
02:35What is Evolutionary History?
35.9K
Scientists record evolutionary history by analyzing fossil, morphological, and genetic data. The fossil record documents the history of life on Earth and provides evidence for evolution. However, both fossil and living organisms offer evidence that outlines Earth’s evolutionary history.
35.9K
01:22Imprinting
9.6K
Behavioral imprinting is observed in some newborn animals and occurs when they develop strong and specific attachments to another animal (usually a parent) following brief, early-life exposures. Offspring imprint onto parents within a brief period after birth or hatching; this time window is called the critical period. Once imprinting occurs, the bond established between the parents and their offspring is usually long-lasting.
9.6K