概括
来自罗斯冰架的海洋学数据显示,中间的水流入导致360米的冰融化. 这一过程维持了基本冰层温度接近环境结点,这对南极冰架的稳定性至关重要.
科学领域:
- 海洋学 海洋学 海洋学
- 冰川学的冰川学
- 南极研究南极研究
背景情况:
- 罗斯冰架是南极冰盖的一个关键组成部分.
- 了解基底冰架过程对于预测冰流失和海平面上升至关重要.
- 以前的研究表明,在南极冰架下面存在复杂的海洋冰相互作用.
研究的目的:
- 为了研究罗斯冰架下方的热状态和水质特征.
- 为了确定导致冰架基本融化的热源.
- 为了描述冰洋界面的海洋学条件.
主要方法:
- 部署一个敏感的浴热仪来记录温度概况.
- 分析温度数据以推断海洋学条件和热传递.
- 在罗斯冰架项目现场 (82°22.5′S, 168°37.5′W) 进行现场特定测量.
主要成果:
- 记录了两个不同的温度概况,表明了特定的海洋学条件.
- 有证据表明,在中间深处,有较温暖的水流入.
- 在360米深处的基底融被确定为一个关键过程,保持温度在-2.14°C左右.
- 在海底观察到一个厚度约35米的混合良好的层.
结论:
- 中间的水流作为热源,推动罗斯冰架的基底融化.
- 观察到的融化模式对于保持冰架底部的热稳定性至关重要.
- 这些发现增强了我们对南极洲冰洋相互作用及其对冰架动态的影响的理解.
相关概念视频
Specific Heat
The specific heat capacity of a substance refers to the energy required to increase the temperature of one gram of that substance by one degree Celcius. Specific heat capacity is often represented in calories (cal), grams (g), and degrees Celsius (oC), but can also be expressed in joules (J), kilograms (kg), and Kelvin (K), among other units.
For example, increasing the temperature of one gram of water by 1°C requires one calorie of heat energy and can be written as 1 cal/g-°C, or 4186 J/kg/K.
For example, increasing the temperature of one gram of water by 1°C requires one calorie of heat energy and can be written as 1 cal/g-°C, or 4186 J/kg/K.
Heating and Cooling Curves
When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
Thermometers and Temperature Scales
Any physical property that depends consistently and reproducibly on temperature can be used as the basis of a thermometer. For example, volume increases with temperature for most substances. This property is the basis for the common alcohol thermometer and the original mercury thermometers. Other properties used to measure temperature include electrical resistance, color, and the emission of infrared radiation.
As many physical properties depend on temperature, the variety of thermometers is...
As many physical properties depend on temperature, the variety of thermometers is...
Thermal Expansion
The expansion of alcohol in a thermometer is one of many commonly encountered examples of thermal expansion, which is the change in size or volume of a given system as its temperature changes. The most visible example is the expansion of hot air. When air is heated, it expands and becomes less dense than the surrounding air, which then exerts an upward force on the hot air to, for example, make steam and smoke rise, and hot air balloons float. The same behavior happens in all liquids and gases,...
Requirements for Human Life
The Earth and its atmosphere have provided humans with air, water, and food, but these are not the only requirements for survival. Humans also require a specific range of temperature and pressure that the Earth and its atmosphere provides.
Oxygen
Atmospheric air is only about 20 percent oxygen, but that oxygen is a key component of the chemical reactions that keep the body alive, including the reactions that produce ATP. Brain cells are susceptible to a lack of oxygen because they require a...
Oxygen
Atmospheric air is only about 20 percent oxygen, but that oxygen is a key component of the chemical reactions that keep the body alive, including the reactions that produce ATP. Brain cells are susceptible to a lack of oxygen because they require a...
Gas Solubility
Gas solubility in liquids forms liquid-gas solutions, such as soft drinks, where carbon dioxide is dissolved in water, and the ocean, where the solubility of oxygen and carbon dioxide supports marine life. The ability of oceans to dissolve gases impacts weather conditions in the troposphere.However, gas-liquid interactions vary. For instance, hydrogen chloride gas is highly soluble in water, while oxygen's solubility is much lower. Because these solutions are non-ideal, Raoult’s law, which...


