Improving the Wet Mapping Function by Numerical Weather Models
Yazarlar (7)
Dr. Öğr. Üyesi Ali Hasan DOĞAN
Tokat Gaziosmanpaşa Üniversitesi, Türkiye
Gfz Helmholtz Centre For Geosciences, Almanya
Gfz Helmholtz Centre For Geosciences, Almanya
Gfz Helmholtz Centre For Geosciences, Almanya
Gfz Helmholtz Centre For Geosciences, Almanya
Artvin Çoruh Üniversitesi, Türkiye
Yıldız Teknik Üniversitesi, Türkiye
| Makale Türü |
Özgün Makale
|
| Makale Alt Türü | SSCI, AHCI, SCI, SCI-Exp dergilerinde yayınlanan tam makale |
| Dergi Adı | Advances in Space Research |
| Dergi ISSN | 0273-1177 Wos Dergi Scopus Dergi |
| Dergi Tarandığı Indeksler | SCI-Expanded |
| Dergi Grubu | Q1 |
| Makale Dili | İngilizce |
| Basım Tarihi | 01-2024 |
| Cilt No | 73 |
| Sayı | 1 |
| Sayfalar | 404 / 413 |
| DOI Numarası | 10.1016/j.asr.2023.07.060 |
| Makale Linki | http://dx.doi.org/10.1016/j.asr.2023.07.060 |
| Özet |
| In space geodetic techniques, the mapping functions (MFs) provide the relationship between zenith and slant tropospheric delays. The MFs are determined under the assumption of spherically layered atmosphere. However, the atmosphere is not spherically layered, and the asymmetry should be considered. Therefore, tropospheric gradients are taken into account. Nevertheless, tropospheric gradients alone can not fully represent the deviation from a spherically layered atmosphere, and hence cm level errors arise especially for low elevation angles. In this study, we present new approaches to modify the wet MF to reduce mismodelling of tropospheric delays. The delays in the study were calculated using ray-tracing algorithm based on ECMWF's ERA5 dataset. We first analyzed the performances of the new approaches. Then, two Precise Point Positioning (PPP) simulation studies and a real case study were carried out for two different regions namely Germany and Türkiye. According to the results, the proposed approaches reduce the modelling errors up to by a factor 6 for both regions. Besides, simulation studies show that the approaches improve the accuracies of the ZTDs and heights. In the practical application however, we could not find a clear improvement in the PPP analyze and this might be related to the ERA5 which can not be regarded error-free. |
| Anahtar Kelimeler |
| ERA5 | Mapping Function | Numerical Weather Model | PPP | Tropospheric delay |
Science Direct
Improving the Wet Mapping Function by Numerical Weather Models
BM Sürdürülebilir Kalkınma Amaçları
| Atıf Sayıları | |
| WoS | 3 |
| SCOPUS | 4 |
| Google Scholar | 4 |