奥利文的高辐射导电性使板块温度提高了高达200K的温度
Enrico Marzotto1,2, Alexander Koptev3,4, Sergio Speziale3
1GFZ Helmholtz Centre for Geosciences, Telegrafenberg, Potsdam, Germany. marzotto@gfz.de.
Nature communications
|July 1, 2025
概括
辐射热传输显著影响降温板的温度. 包括这种效应在模型中表明板块更热,影响水运输到地球地幔.
科学领域:
- 地质物理学 地质物理学
- 矿物物理 矿物物理
- 高压/高温科学 高压/高温科学
背景情况:
- 降温板的热进化对于理解地球的内部过程,包括水运输至关重要.
- 现有的模型经常忽略辐射导热率,因为有限的高压,高温矿物质不透明度数据.
研究的目的:
- 在地幔条件下实验性地确定奥利文的辐射导热率.
- 为了建模辐射热传输对降压板温度和水含量的影响.
主要方法:
- 在高压 (P) 和高温 (T) 下进行了光学实验,以测量橄中辐射热传输.
- 采用2D热动力学建模来模拟板块演变,并结合了辐射导电性.
主要成果:
- 辐射热传输约占橄中总热传输的40%.
- 包括辐射导电性在内,与没有辐射导电性的模型相比,板块温度增加了100200K.
结论:
- 辐射热传输是压板热演变的一个重要因素.
- 由于辐射,板块温度较高会延迟含水矿物质的脱水.
- 含水矿物质只能在旧的板块 (>60万年) 或在高潜流速度 (≥10厘米/年) 中到达地幔过渡区.
相关概念视频
Absorption of Radiation
829
The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
829
Radiation: Applications
1.3K
The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
The average...
The average...
1.3K
Mechanisms of Heat Transfer II
3.5K
In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
3.5K
Thermal Insulation in Masonry Walls
196
In hot, dry climates, the thermal mass of masonry walls can be beneficial, absorbing heat during the day and releasing it at night, thereby stabilizing indoor temperatures. However, in most other climates, additional insulation is necessary to enhance thermal resistance.
External insulation can be applied using an Exterior Insulation and Finish System (EIFS), which involves affixing panels of plastic foam to the wall and covering them with a polymeric stucco reinforced with glass fiber mesh....
External insulation can be applied using an Exterior Insulation and Finish System (EIFS), which involves affixing panels of plastic foam to the wall and covering them with a polymeric stucco reinforced with glass fiber mesh....
196
Mechanism of heat transfer
1.4K
Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
1.4K
Heat Flow and Specific Heat
5.7K
Heat is a type of energy transfer that is caused by a temperature difference, and it can change the temperature of an object. Since heat is a form of energy, its SI unit is the joule (J). Another common unit of energy often used for heat is the calorie (cal), which is defined as the energy needed to change the temperature of 1 g of water by 1 °C, specifically between 14.5 °C and 15.5 °C, since the energy needed shows a slight temperature dependence. Another commonly used unit is...
5.7K


