Analysis of ionospheric structure influences on residual ionospheric errors in GNSS radio occultation bending angles based on ray tracing simulations
文献类型：期刊论文
| 作者 | Schwaerz, Marc1,7,8,9; Liu, Congliang1,6,9; Kirchengast, Gottfried1,3,6,7,8,9; Sun, Yueqiang1,2,6,9; Zhang, Kefei3,5; Norman, Robert3; Bai, Weihua1,2,6,9; Du, Qifei1,6,9; Li, Ying4 |
| 刊名 | ATMOSPHERIC MEASUREMENT TECHNIQUES
 |
| 出版日期 | 2018-04-26 |
| 卷号 | 11期号:4页码:2427-2440 |
| ISSN号 | 1867-1381 |
| DOI | 10.5194/amt-11-2427-2018 |
| 英文摘要 | The Global Navigation Satellite System (GNSS) radio occultation (RO) technique is widely used to observe the atmosphere for applications such as numerical weather prediction and global climate monitoring. The ionosphere is a major error source to RO at upper stratospheric altitudes, and a linear dual-frequency bending angle correction is commonly used to remove the first-order ionospheric effect. However, the higher-order residual ionospheric error (RIE) can still be significant, so it needs to be further mitigated for high-accuracy applications, especially from 35 km altitude upward, where the RIE is most relevant compared to the decreasing magnitude of the atmospheric bending angle. In a previous study we quantified RIEs using an ensemble of about 700 quasi-realistic end-to-end simulated RO events, finding typical RIEs at the 0.1 to 0.5 mu rad noise level, but were left with 26 exceptional events with anomalous RIEs at the 1 to 10 mu rad level that remained unexplained. In this study, we focused on investigating the causes of the high RIE of these exceptional events, employing detailed alongray-path analyses of atmospheric and ionospheric refractivities, impact parameter changes, and bending angles and RIEs under asymmetric and symmetric ionospheric structures. We found that the main causes of the high RIEs are a combination of physics-based effects - where asymmetric ionospheric conditions play the primary role, more than the ionization level driven by solar activity - and technical ray tracer effects due to occasions of imperfect smoothness in ionospheric refractivity model derivatives. We also found that along-ray impact parameter variations of more than 10 to 20m are possible due to ionospheric asymmetries and, depending on prevailing horizontal refractivity gradients, are positive or negative relative to the initial impact parameter at the GNSS transmitter. Furthermore, mesospheric RIEs are found generally higher than upper-stratospheric ones, likely due to being closer in tangent point heights to the ionospheric E layer peaking near 105 km, which increases RIE vulnerability. In the future we will further improve the alongray modeling system to fully isolate technical from physicsbased effects and to use it beyond this work for additional GNSS RO signal propagation studies. |
| 资助项目 | National Natural Science Foundation of China[41405039] ; National Natural Science Foundation of China[41775034] ; National Natural Science Foundation of China[41405040] ; National Natural Science Foundation of China[41505030] ; National Natural Science Foundation of China[41606206] ; National Natural Science Foundation of China[41730109] ; FengYun-3 (FY-3) Global Navigation Satellite System Occultation Sounder (GNOS) development and manufacture project ; European Space Agency (ESA) project OPSGRAS ; European Space Agency (ESA) project MMValRO ; Austrian Research Promotion Agency (FFG) project OPSCLIMPROP (ASAP-9 project)[840070] ; Australian Research Council (ARC)[LP0883288] ; Australian Antarctic Division[4159] ; CAS/SAFEA International Partnership Program for Creative Research Teams[KZZD-EW-TZ-05] ; Jiangsu dual creative talents project ; Jiangsu dual creative team program project |
| WOS研究方向 | Meteorology & Atmospheric Sciences |
| 语种 | 英语 |
| WOS记录号 | WOS:000431006100003 |
| 出版者 | COPERNICUS GESELLSCHAFT MBH |
| 源URL | [http://202.127.146.157/handle/2RYDP1HH/5197]  |
| 专题 | 中国科学院武汉植物园 |
| 通讯作者 | Liu, Congliang |
| 作者单位 | 1.Karl Franzens Univ Graz, Beijing, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.RMIT Univ, SPACE Res Ctr, Melbourne, Vic, Australia 4.Chinese Acad Sci, IGG, Wuhan, Peoples R China 5.China Univ Min & Technol, Sch Environm Sci & Spatial Informat, Xuzhou, Peoples R China 6.Chinese Acad Sci, Natl Space Sci Ctr, Beijing Key Lab Space Environm Explorat, Beijing, Peoples R China 7.Karl Franzens Univ Graz, Wegener Ctr Climate & Global Change WEGC, Graz, Austria 8.Karl Franzens Univ Graz, Inst Geophys Astrophys & Meteorol, Inst Phys, Graz, Austria 9.Chinese Acad Sci, NSSC, JLOAC, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Schwaerz, Marc,Liu, Congliang,Kirchengast, Gottfried,et al. Analysis of ionospheric structure influences on residual ionospheric errors in GNSS radio occultation bending angles based on ray tracing simulations[J]. ATMOSPHERIC MEASUREMENT TECHNIQUES,2018,11(4):2427-2440. |
| APA | Schwaerz, Marc.,Liu, Congliang.,Kirchengast, Gottfried.,Sun, Yueqiang.,Zhang, Kefei.,...&Li, Ying.(2018).Analysis of ionospheric structure influences on residual ionospheric errors in GNSS radio occultation bending angles based on ray tracing simulations.ATMOSPHERIC MEASUREMENT TECHNIQUES,11(4),2427-2440. |
| MLA | Schwaerz, Marc,et al."Analysis of ionospheric structure influences on residual ionospheric errors in GNSS radio occultation bending angles based on ray tracing simulations".ATMOSPHERIC MEASUREMENT TECHNIQUES 11.4(2018):2427-2440. |
入库方式： OAI收割
来源：武汉植物园
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