气候变化领域集成服务门户(CCPortal): Tibetan zenith wet delay model with refined vertical correction

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DOI	10.1007/s00190-023-01719-z
	Tibetan zenith wet delay model with refined vertical correction
	Xu, Chaoqian; Liu, Chen; Yao, Yibin; Wang, Qin; Wang, Xiaoqing
发表日期	2023
ISSN	0949-7714
EISSN	1432-1394
卷号	97 期号:4
英文摘要	Tibet presents significant elevation changes, thus leading to extraordinary tropospheric conditions. This eventually forms complicated and diverse delays in satellite data (such as global navigation satellite system (GNSS) observations), particularly for the wet component. Such delays cause non-negligible errors in microwave-dependent techniques. As infrastructure development progresses, GNSS applications (such as real-time kinematic and unmanned aerial vehicles) require a reliable tropospheric model that works not only on the surface but also over broader operating heights to pre-correct delays. However, the existing models, even the widely used global pressure and temperature 3 (GPT3) model, exhibit low performance in Tibet due to insufficient spatiotemporal resolution and limited vertical correction capability. We thereby proposed a refined Tibetan zenith wet delay (ZWD) model (TZ) established using pressure-level ERA5 datasets with a horizontal resolution of 0.25 degrees released by the European Centre for Medium-Range Weather Forecasts. The core of the TZ is the optimized vertical correction, i.e., the cubic polynomial with two more parameters than the commonly used exponential function, whose underlying parameters are determined by a least-squares function refined up to semidiurnal harmonics. TZ achieves ZWD estimates for an arbitrary time and height in the Tibetan region with the above structure. ERA5- and radiosonde-derived ZWDs validated the TZ performance. Validation results show that the TZ model achieved a lower bias and root-mean-square error than the GPT3 model, regardless of the surface or other height layers. It demonstrates that the TZ performs better in Tibet than the widely adopted GPT3. The required MATLAB scripts and coefficient matrix of the TZ are available at https://zenodo.org/ record/7063960.
关键词	Tibet Global navigation satellite system (GNSS)Zenith wet delay (ZWD)ERA5 Vertical correction
英文关键词	MAPPING FUNCTIONS; ATMOSPHERE DELAY; SLANT DELAYS; ERA-INTERIM; VLBI
WOS研究方向	Geochemistry & Geophysics ; Remote Sensing
WOS记录号	WOS:000960739800001
来源期刊	JOURNAL OF GEODESY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283306
作者单位	Wuhan University; Wuhan University
推荐引用方式 GB/T 7714	Xu, Chaoqian,Liu, Chen,Yao, Yibin,et al. Tibetan zenith wet delay model with refined vertical correction[J],2023,97(4).
APA	Xu, Chaoqian,Liu, Chen,Yao, Yibin,Wang, Qin,&Wang, Xiaoqing.(2023).Tibetan zenith wet delay model with refined vertical correction.JOURNAL OF GEODESY,97(4).
MLA	Xu, Chaoqian,et al."Tibetan zenith wet delay model with refined vertical correction".JOURNAL OF GEODESY 97.4(2023).