Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2016JD026184 |
A directional model of tropospheric horizontal gradients in Global Positioning System and its application for particular weather scenarios | |
Masoumi, Salim; McClusky, Simon; Koulali, Achraf; Tregoning, Paul | |
2017-04-27 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2017 |
卷号 | 122期号:8 |
文章类型 | Article |
语种 | 英语 |
国家 | Australia |
英文摘要 | Improper modeling of horizontal tropospheric gradients in GPS analysis induces errors in estimated parameters, with the largest impact on heights and tropospheric zenith delays. The conventional two-axis tilted plane model of horizontal gradients fails to provide an accurate representation of tropospheric gradients under weather conditions with asymmetric horizontal changes of refractivity. A new parametrization of tropospheric gradients whereby an arbitrary number of gradients are estimated as discrete directional wedges is shown via simulations to significantly improve the accuracy of recovered tropospheric zenith delays in asymmetric gradient scenarios. In a case study of an extreme rain event that occurred in September 2002 in southern France, the new directional parametrization is able to isolate the strong gradients in particular azimuths around the GPS stations consistent with the V shape spatial pattern of the observed precipitation. In another study of a network of GPS stations in the Sierra Nevada region where highly asymmetric tropospheric gradients are known to exist, the new directional model significantly improves the repeatabilities of the stations in asymmetric gradient situations while causing slightly degraded repeatabilities for the stations in normal symmetric gradient conditions. The average improvement over the entire network is approximate to 31%, while the improvement for one of the worst affected sites P631 is approximate to 49% (from 8.5 mmto 4.3mm) in terms of weighted root-mean-square (WRMS) error and approximate to 82% (from -1.1 to -0.2) in terms of skewness. At the same station, the use of the directional model changes the estimates of zenith wet delay by 15mm (approximate to 25%). |
英文关键词 | tropospheric horizontal gradients Global Positioning System directional gradient model asymmetric gradients tropospheric zenith delay |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000401180800016 |
WOS关键词 | 8-9 SEPTEMBER 2002 ; MAPPING FUNCTIONS ; FLASH-FLOOD ; DELAY ; ACCURACY ; FRANCE ; INTERFEROMETRY ; REFRACTIVITY ; ATMOSPHERE |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/33323 |
专题 | 气候变化 |
作者单位 | Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT, Australia |
推荐引用方式 GB/T 7714 | Masoumi, Salim,McClusky, Simon,Koulali, Achraf,et al. A directional model of tropospheric horizontal gradients in Global Positioning System and its application for particular weather scenarios[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2017,122(8). |
APA | Masoumi, Salim,McClusky, Simon,Koulali, Achraf,&Tregoning, Paul.(2017).A directional model of tropospheric horizontal gradients in Global Positioning System and its application for particular weather scenarios.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,122(8). |
MLA | Masoumi, Salim,et al."A directional model of tropospheric horizontal gradients in Global Positioning System and its application for particular weather scenarios".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 122.8(2017). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论