在GMAP/SIJAQ活动期间验证GEMS操作v2.0总列NO2和HCHO
Kangho Bae1, Chang-Keun Song2, Michel Van Roozendael3
1Department of Civil, Urban, Earth and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, Republic of Korea; Research & Management Center for Particulate Matters at the Southeast Region of Korea, Ulsan National Institute of Science and Technology (UNIST), Ulsan, Republic of Korea.
The Science of the total environment
|March 26, 2025
概括
地静态环境监测光谱仪 (GEMS) 与地面Pandora和MAX-DOAS对NO2和HCHO的测量显示出很好的一致性. 然而,GEMS在高污染期间高估了NO2,低估了HCHO,需要进一步验证以进行准确的空气质量监测.
科学领域:
- 大气科学 大气科学
- 遥感 遥感 遥感 遥感
- 空气质量监测 空气质量监测
背景情况:
- 地静态环境监测光谱仪 (GEMS) 是第一个用于空气质量监测的地静态卫星仪器,提供每小时对亚洲的观测.
- 对GEMS 2级产品的验证对于可靠的空气质量数据至关重要,需要进行地面比较.
- 为了评估GEMS数据,进行了GEMS空气污染物2021地图 (GMAP2021) 和卫星综合空气质量联合监测2022 (SIJAQ2022) 活动.
研究的目的:
- 通过使用地面Pandora和多轴差光学吸收光谱仪 (MAX-DOAS) 测量,评估GEMS操作v2.0总列NO2和HCHO产品.
- 分析GEMS,Pandora和MAX-DOAS检索处理器之间的差异,并评估查看几何对齐的影响.
- 评估GEMS NO2和HCHO产品在各种条件下的性能,包括不同的污染水平和日间时间.
主要方法:
- 对GEMS v2.0总列NO2和HCHO产品与Pandora (P189) 和IUP布雷门MAX-DOAS测量的比较分析.
- 在Pandora和MAX-DOAS仪器之间对视觉方向进行调整,以分析对检索准确性的影响.
- 在南韩的多个地面站点在GMAP2021和SIJAQ2022活动中对GEMS产品的评估.
主要成果:
- 视图几何体的对齐显著改善了来自潘多拉和MAX-DOAS的NO2和HCHO热层柱的检索,增加了相关系数.
- GEMS v2.0 NO2总列产品与潘多拉 (R=0.87) 有很好的一致性,但倾向于高估+41%,特别是在高污染事件期间.
- GEMS HCHO产品能够很好地捕捉季节性和日间变化,与MAX-DOAS和Pandora (R=0.86) 都表现出很好的一致性,尽管大柱子被低估了.
结论:
- GEMS卫星仪表显示了对NO2和HCHO的监测有前途的能力,与地面测量相一致.
- 在NO2和HCHO检索中的差异突显了仪器查看几何和检索处理器差异的重要性.
- 进一步完善GEMS检索算法和持续验证是必要的,以解决观察到的偏差,并提高空气质量评估的准确性.
相关概念视频
Data Validation
4.8K
Data validation is an essential part of a comprehensive assessment. Validation is confirming or verifying and opening the door to gathering more assessment data as it clarifies vague or unclear data. The process of checking and verifying the collected information is called data validation. The primary purpose of data validation is to ensure data is as free from error, bias, and misinterpretation as possible.
Nursing assessment guides are generally based on holistic models rather than medical...
Nursing assessment guides are generally based on holistic models rather than medical...
4.8K
Column Efficiency: Plate Theory
432
Band broadening in a chromatography column is measured by its efficiency. This is determined by the number of theoretical plates (N). Theoretical plate theory states that a separation column consists of a continuous series of imaginary plates where solute equilibration occurs between stationary and mobile phases.
A higher number of theoretical plates signifies better column efficiency and improved separation capabilities. Plate height affects bandwidth and separation quality; it is inversely...
A higher number of theoretical plates signifies better column efficiency and improved separation capabilities. Plate height affects bandwidth and separation quality; it is inversely...
432
Design of Columns under a Centric Load
100
The design of columns under centric load is a fundamental aspect of structural engineering and is critical for ensuring the stability and integrity of structures. Euler's and Secant's formulas are central to understanding and calculating the critical load and deformation behaviors of columns, providing a basis for safe and effective structural design.
Euler's formula is applicable under the assumption that the column is a perfect, straight, homogenous prism, and it is operating...
Euler's formula is applicable under the assumption that the column is a perfect, straight, homogenous prism, and it is operating...
100
Types Of Column Chromatography
10.8K
The stability and compatibility of column material with samples are crucial for efficient purification in chromatographic techniques. Various operating parameters such as pH, temperature, or solvent affect the packing of the column material, thereby determining the purification efficiency. The choice of column material also plays an essential role in deciding the operating parameters and can be modified based on the proteins that need to be purified.
Gel Filtration Chromatography
When the...
Gel Filtration Chromatography
When the...
10.8K
Design of Columns under an Eccentric Load
403
Designing columns to withstand eccentric loads is a critical aspect of structural engineering, ensuring structures can support off-center loads without failure. This design process must account for the additional normal stresses introduced by eccentric loading, which can significantly influence a column's stress distribution and overall stability. An eccentric load applied to a column induces normal stresses that can be conceptualized as a combination of stresses due to an equivalent...
403
Maximum Size of Aggregate
65
The maximum size of aggregate is defined as the aperture of the sieve retaining 15 percent or more of the particles present in the aggregate sample. The aggregate's maximum size impacts the concrete's water requirement, workability, and strength. Larger aggregates reduce the surface area needing cement paste coverage, which can lower water needs, thereby allowing a decrease in the water-to-cement ratio when the desired workability and richness of the mix are to be maintained, which can...
65


