使用局部组合卡尔曼波器同化地面GNSS数据
Changliang Shao1, Lars Nerger2
1CMA Research Centre On Meteorological Observation Engineering Technology, CMA Meteorological Observation Centre, Beijing, China. shaocl@cma.gov.cn.
Scientific reports
|September 17, 2024
概括
通过更好的数据同化,可以改善对海洋的热带气旋预报. 同化全球导航卫星系统 (GNSS) 数据显著提高了预测准确性,特别是当与其他类型的观测相结合时.
科学领域:
- 大气科学 大气科学
- 气象学 天气学
- 地质测量是指地质测量.
背景情况:
- 高分辨率模型显示热带气旋表现出非线性和动态不稳定的行为.
- 低于最佳的初始条件限制了预测的准确性,强调了需要改进数据同化.
- 缺乏基于地面的海洋全球导航卫星系统 (GNSS) 观测,阻碍了对这些地区同化程度的评估.
研究的目的:
- 评估数据同化对热带气旋预报在海洋地区的准确性的影响.
- 评估同化各种合成观测的有效性,包括GNSS数据.
- 通过GNSS数据同化,研究改善天气预报的潜力.
主要方法:
- 一个观察系统模拟实验 (OSSE) 使用热带气旋案例进行.
- 使用WRF-PDAF框架与传统和GNSS观测运营商进行了数据同化实验.
- 合成观测 (温度,风组成部分,沉降水,顶峰总延迟) 使用局部错误子空间转换卡尔曼波器 (LESTKF) 进行了同化.
主要成果:
- 数据同化显著提高了在海洋上的热带气旋预报的准确性.
- 多种观测类型的同化,特别是GNSS数据,进一步提高了预测精度.
- 该研究表明了GNSS数据同化技术的关键作用和潜力.
结论:
- GNSS数据同化是提高热带气旋天气预报能力的一种有前途的技术.
- 在海洋上建立地面GNSS观测站是未来改进的关键一步.
- 加强数据同化策略对于克服当前热带气旋建模的局限性至关重要.
相关概念视频
01:28Field Application of Global Positioning System
38
The Global Positioning System (GPS) has become an indispensable tool in fieldwork, offering unparalleled precision and efficiency for surveying, navigation, and infrastructure development. By harnessing signals from a constellation of satellites, GPS receivers determine the location of objects with remarkable speed and accuracy, often completing calculations within a second.Advantages of Modern GPS TechnologyContemporary GPS receivers are designed to meet the practical demands of field...
38
01:26Errors in Global Positioning System
39
Global Positioning System (GPS) technology has revolutionized navigation and positioning, but its accuracy is often compromised by various errors. These errors, stemming from environmental, satellite, and receiver-related factors, require careful mitigation to ensure reliable performance across applications.Atmospheric ErrorsGPS signals travel through the Earth’s ionosphere and troposphere, introducing delays which affect accuracy. The ionosphere is strongly influenced by charged particles,...
39
01:30Types of Global Positioning System Surveys
51
GPS surveying methods vary in application, accuracy, and data collection techniques, catering to diverse surveying and mapping needs. Static GPS, kinematic GPS, and real-time kinematic (RTK) surveying are widely used. Each technique offers distinct advantages.Static GPS involves placing one receiver at a known reference point and another at the target point. It collects exact positional data by observing multiple satellite ranges over an extended period, achieving centimeter-level accuracy for...
51
01:30Introduction to Global Positioning System
47
The Global Positioning System (GPS) revolutionized positioning on Earth, providing precise location data through satellite ranging. The GPS system was developed in 1978 by the U.S. Department of Defense for military use, and it became available for civilian applications in 1983, transforming fields including navigation, fleet management, and time synchronization for telecommunications systems.GPS consists of satellites in medium Earth orbit, about 20,200 kilometers above the surface,...
47
01:30Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device
26
Surveyors use Global Positioning System (GPS) technology to measure the precise location and elevation of points on Earth. In a recent survey, GPS receivers were used to determine the coordinates and elevations of two park monuments. The process involved careful mission planning, data collection, and correction to ensure accuracy. The survey began with mission planning to identify optimal satellite visibility and minimize Position Dilution of Precision (PDOP). A geodetic control point...
26
01:03Precipitation Gravimetry
5.5K
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...
5.5K