Results 81 to 90 of about 5,886 (223)

Estimating the impact of Global Navigation Satellite System horizontal delay gradients in variational data assimilation [PDF]

, 2018
We developed operators to assimilate Global Navigation Satellite System (GNSS) Zenith Total Delays (ZTDs) and horizontal delay gradients into a numerical weather model. In this study we experiment with refractivity fields derived from the Global Forecast
Dick, Galina, Douša, Jan, Kačmařík, Michal, Václavovic, Pavel, Wickert, Jens, Zus, Florian   +5 more
core   +2 more sources

Long-term ground-based GNSS-derived ZTD trends for climate

, 2023
The 28th IUGG General Assembly (IUGG2023) (Berlin 2023)
Santos, Marcelo, Balidakis, Kyriakos, Klos, Anna, Pacione, Rosa, Rees, Jordan   +4 more
openaire   +2 more sources

Active Diffusion Controlled Dual Stability in Thermoelectrics for Sustainable Heat Harvesting

Advanced Materials, Volume 37, Issue 38, September 25, 2025.
Introducing a Mg interlayer at the junction simultaneously stabilizes Mg3(Bi,Sb)2 materials and contacts for over 100 days. This dual stabilization derives from suppressing detrimental Mg diffusion and compensating for Mg loss, thereby maintaining an outstanding power density of 0.45 W cm−2 and remarkable conversion efficiency of 8.6% in aged modules ...
Longquan Wang, Airan Li, Xinzhi Wu, Jiankang Li, Takeo Ohsawa, Takao Mori   +5 more
wiley   +1 more source

Analysis of the Synergistic Effect of Water Vapor, Thermodynamics, and Dynamics of the Heavy Rainfall Over Henan Province, China in July 2021

Meteorological Applications, Volume 32, Issue 5, September/October 2025.
In this study, a record‐breaking rainfall is analyzed based on the observation data and reanalysis data. The overlay of precipitation provided by both dynamic delivery from the southeast and cloud microphysical production over Zhengzhou was the main cause of the rainfall under the background of an atypical weak environmental field. ABSTRACT During July
Yang Yu, Rong Wan, Zhikang Fu
wiley   +1 more source

Riverine Isoscapes Modeling in the Yangtze River Basin, China: Insights Into Basin Processes and Source‐Water Contributions

Water Resources Research, Volume 61, Issue 9, September 2025.
Abstract The utilization of surface water isoscapes facilitates the characterization of source‐water contributions and hydrological processes within a basin. However, intricate river network topology poses significant challenges in applying this approach to large and complex basins.
Mengyao Ding, Huawu Wu, Ruiyu Lei, Hongxiang Fan, Jing Li, Kaiwen Li, Qing Zhu, Rongrong Wan, Congsheng Fu   +8 more
wiley   +1 more source

Regional Tropospheric Delay Prediction Model Based on LSTM-Enhanced Encoder Network

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Precise modeling of zenith tropospheric delay (ZTD) is essential for real-time high-precision positioning in global navigation satellite systems. Due to the stochastic variability of atmospheric water vapor across different regions, tropospheric delay ...
Yuanfang Peng, Chenglin Cai, Zexian Li, Kaihui Lv, Xue Zhang, Yihao Cai   +5 more
doaj   +1 more source

A New Zenith Tropospheric Delay Grid Product for Real-Time PPP Applications over China

Sensors, 2017
Tropospheric delay is one of the major factors affecting the accuracy of electromagnetic distance measurements. To provide wide-area real-time high precision zenith tropospheric delay (ZTD), the temporal and spatial variations of ZTD with altitude were ...
Yidong Lou, Jinfang Huang, Weixing Zhang, Hong Liang, Fu Zheng, Jingnan Liu   +5 more
doaj   +1 more source

An investigation of PPP-B2b coverage and its performance in ZTD estimation and positioning in different regions

Survey Review
This study comprehensively evaluates the Beidou navigation satellite system's PPP-B2b service for real-time positioning and zenith total delay (ZTD) estimation. Despite its operational status, PPP-b2b's effective coverage is underexplored. We define this
Xiaoming Wang, Kai Zhou, Jinglei Zhang, Haobo Li, Hong Liang, Manhong Tu, Yufei Chen, Cong Qiu, Li Li   +8 more
semanticscholar   +1 more source

Accuracy Assessment and Rainfall Intensity Response Mechanisms in GNSS Real‐Time PPP Water Vapor Retrieval: Coupling Effects of Multi‐Source Real‐Time Products and Meteorological Conditions

Earth and Space Science, Volume 12, Issue 9, September 2025.
Abstract The Global Navigation Satellite System (GNSS) real‐time Precise Point Positioning (PPP) technology offers a highly efficient approach for atmospheric Precipitable Water Vapor (PWV) monitoring and extreme weather warning. However, its retrieval accuracy is limited by the performance of orbit and clock products, as well as the coupling effects ...
Wenliang Gao, Guigen Nie, Yu Guo, Jiaqi Shi, Shuguang Wu   +4 more
wiley   +1 more source

EFFECTS OF OCEAN TIDE MODELS ON GNSS-ESTIMATED ZTD AND PWV IN TURKEY [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2015
Global Navigation Satellite System (GNSS) observations can precisely estimate the total zenith tropospheric delay (ZTD) and precipitable water vapour (PWV) for weather prediction and atmospheric research as a continuous and all-weather technique. However,
G. Gurbuz, S. Jin, C. Mekik
doaj   +1 more source