西藏高原的干旱与地球的冷却有关,这发生在欧 - 奥利古过渡时期
Guillaume Dupont-Nivet1, Wout Krijgsman, Cor G Langereis
1Paleomagnetic Laboratory Fort Hoofddijk, Department of Earth Sciences, Utrecht University, Budapestlaan 17, The Netherlands. gdn@geo.uu.nl
Nature
|February 9, 2007
概括
埃奥森 - 奥利古森过渡时期的全球冷却导致亚洲出现了显著的干旱和冷却. 这项研究强调了全球气候事件对大陆环境的影响.
科学领域:
- 古气候学 古气候学
- 地质地质地质地质地质地
背景情况:
- 亚洲的环境变化通常归因于西藏高原的升起和大陆漂移.
- 全球气候事件的作用,如世-世过渡期,在塑造亚洲环境中的作用仍然不清楚.
研究的目的:
- 调查欧 - 奥利古过渡对亚洲环境的影响.
- 确定全球气候或构造学是否主要推动亚洲的干旱.
主要方法:
- 利用磁层学和循环层学来准确测定沉积物记录的年代.
- 分析了西藏高原东北部的湖沉积物,以确定干旱事件.
主要成果:
- 西藏东北部高原的干旱,标志着海湖沉积物的消失,恰好与欧纪-奥利古纪过渡相吻合.
- 古生物学和古环境数据证实,在这个时期,亚洲大陆普遍出现了干旱和冷却.
结论:
- 埃奥森 - 奥利古森过渡,一个全球冷却事件,显著影响了亚洲环境,导致干旱和冷却.
- 区分全球气候对亚洲大陆环境的影响与构造力的影响,强调全球气候变化的作用.
相关概念视频
What is Climate?
21.1K
Climate refers to the prevailing weather conditions in a specific area over an extended period. As the saying goes, “Climate is what you expect. Weather is what you get.” Climate is influenced by geographic factors, such as latitude, terrain, and proximity to bodies of water.
21.1K
Isothermal Processes
5.1K
A thermodynamic process that occurs at constant temperature is called an isothermal process. Heat slowly flows into the system or out of the system to maintain thermal equilibrium. Processes involving phase changes like water evaporation into steam or freezing water into ice at a constant temperature are examples of Isothermal Processes.
An ideal gas can also undergo isothermal expansion or compression.
For example, consider 1 mole of an ideal gas inside an isolated cylinder at initial volume V...
An ideal gas can also undergo isothermal expansion or compression.
For example, consider 1 mole of an ideal gas inside an isolated cylinder at initial volume V...
5.1K
Diversity of Archaea II
585
Archaea, one of the three domains of life, exhibit remarkable diversity and adaptability, thriving in both extreme and moderate environments. Historically, most identified archaea have been classified into two major phyla: Euryarchaeota and Crenarchaeota. However, recent molecular studies have expanded this classification to include three additional phyla: Thaumarchaeota, Nanoarchaeota, and Korarchaeota, each exhibiting unique characteristics and ecological roles.Thaumarchaeota: Mesophiles...
585
Global Climate Change
29.2K
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.
29.2K
Phase Transitions: Sublimation and Deposition
20.5K
Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
20.5K
Responses to Heat and Cold Stress
15.3K
Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
15.3K


