估计1公里黎明-黄昏全天陆地表面温度使用基于森林的随机再分析和热红外遥感数据合并 (RFRTM) 方法
Yaohai Dong1, Xiaodong Zhang2, Xiuqing Hu3
1Committee of Science and Technology, Shanghai Academy of Space Technology, Shanghai 201109, China.
Sensors (Basel, Switzerland)
|January 25, 2025
概括
这项研究引入了一种新方法,用于创建高分辨率,全天陆地表面温度 (LST) 数据,用于黎明至黄昏时间. 基于森林的随机方法 (RFRTM) 结合了卫星和再分析数据,提高了LST应用的准确性和时间覆盖.
科学领域:
- 地球科学 地球科学 地球科学
- 遥感 遥感 遥感 遥感
- 气候科学 气候科学
背景情况:
- 高分辨率,全天陆地表面温度 (LST) 数据至关重要,但目前受到卫星观测时间的限制.
- 现有的方法通常依赖于单个热红外线 (TIR) 源,限制时间分辨率和覆盖范围,特别是在黎明至黄昏期间.
研究的目的:
- 开发和验证一种新的方法,用于在黎明至黄昏时间估计1公里的全天空LST.
- 通过合并不同的卫星和再分析数据集来弥补高时间分辨率LST数据的差距.
主要方法:
- 实施了一种基于森林的随机检索方法 (RFRTM),将Fengyun (FY)-3E MERSI-LL (中分辨率光谱成像仪) 观测结果与全球土地数据同化系统 (GLDAS) 数据合并.
- 验证了RFRTM衍生的LST与原来的MERSI-LLLST以及现场测量.
主要成果:
- 与原来的MERSI-LL LST相比,RFRTM表现出良好的稳定性,LST标准偏差在0.62-0.86 K之间.
- 在现场验证显示,估计的LST在全天空条件下达到1.34-3.71K的精度.
- 在精度和图像质量方面,RFRTM LST在使用MERSI-LL和SSMI/S (特殊传感器微波成像仪/声波仪) 的以前的合并方法中表现出色.
结论:
- 该RFRTM有效地产生准确和高质量的黎明-黄昏1公里全天空LST数据.
- 这种方法填补了LST数据可用性的关键缺口,为各种应用提供了更好的时间分辨率.
- 这些发现支持在更细微的时空尺度上加强对陆地表面过程的监测和分析.
相关概念视频
Temperature Measurement Sites
1.5K
A thermometer measures body temperature. The common sites for measuring body temperature are the oral cavity, axillary region, temporal artery, and skin surface, such as the forehead, abdomen, and axilla. True core body temperature is assessed in the rectum, tympanic membrane, pulmonary artery, esophagus, and urinary bladder.
Oral: When assessing oral temperature, the thermometer tip should be placed under the tongue in the posterior sublingual pocket. It offers accurate readings and can be...
Oral: When assessing oral temperature, the thermometer tip should be placed under the tongue in the posterior sublingual pocket. It offers accurate readings and can be...
1.5K
Radiation: Applications
1.1K
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...
1.1K
Precipitation Gravimetry
5.2K
Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
5.2K
Flame Photometry: Overview
443
Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
443
Flame Photometry: Lab
211
In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
211


