Results 41 to 50 of about 421 (151)

Assessment of GNSS zenith tropospheric delay responses to atmospheric variables derived from ERA5 data over Nigeria

Satellite Navigation, 2023
Tropospheric delay is a major error caused by atmospheric refraction in Global Navigation Satellite System (GNSS) positioning. The study evaluates the potential of the European Centre for Medium-range Weather Forecast (ECMWF) Reanalysis 5 (ERA5 ...
Ifechukwu Ugochukwu Nzelibe, Herbert Tata, Timothy Oluwadare Idowu   +2 more
doaj   +1 more source

Three‐Year Characterization of Boundary Layer Dynamics From GNSS Zenith Wet Delay Spectral Analysis

Atmospheric Science Letters, Volume 27, Issue 6, June 2026.
Three years of GNSS zenith wet delay observations at Payerne reveal that spectral parameters—cutoff frequency α and variance σ2—capture robust seasonal cycles in boundary layer turbulence (R2 = 0.54 for α). Their inverse coupling tightens to r = −0.82 under summer convection, encoding regime‐dependent physics.
Gaël Kermarrec, Xavier Calbet, Zhiguo Deng   +2 more
wiley   +1 more source

A Hybrid Deep Learning Algorithm for Tropospheric Zenith Wet Delay Modeling with the Spatiotemporal Variation Considered

Atmosphere
The tropospheric Zenith Wet Delay (ZWD) is one of the primary sources of error in Global Navigation Satellite Systems (GNSS). Precise ZWD modeling is essential for GNSS positioning and Precipitable Water Vapor (PWV) retrieval.
Yin Wu, Lu Huang, Wei Feng, Su Tian
doaj   +1 more source

Evaluation of Precipitable Water Vapor Retrieval from Homogeneously Reprocessed Long-Term GNSS Tropospheric Zenith Wet Delay, and Multi-Technique

Remote Sensing, 2021
Water vapor is one of the most important greenhouse gases in the world. There are many techniques that can measure water vapor directly or remotely. In this work, we first study the Global Positioning System (GPS)- and the Global Navigation Satellite ...
Hang Su, Tao Yang, Kan Wang, Baoqi Sun, Xuhai Yang   +4 more
doaj   +1 more source

A New Strategy for Improving Multi‐Frequency PPP‐RTK Ionospheric Correction Availability and User Performance in Low‐ and Middle‐Latitudes

Journal of Geophysical Research: Space Physics, Volume 131, Issue 6, June 2026.
Abstract High‐precision regional ionospheric correction products are essential for achieving accurate and fast‐convergence solutions in Precise Point Positioning Real‐Time Kinematic (PPP‐RTK). For users in low‐ and middle‐latitudes, PPP‐RTK server narrow‐lane (NL) ambiguity resolution (AR) typically requires more than 10 min, which largely affects the ...
Pan Li, Shitong Chen, Jiahuan Hu, Xin Xie, Jiadi Dai, Bao Shu, Guanwen Huang   +6 more
wiley   +1 more source

GRENet: GNSS‐Enhanced Radar Extrapolation Network for Precipitation Nowcasting

Geophysical Research Letters, Volume 53, Issue 10, 28 May 2026.
Abstract Accurate precipitation nowcasting is one of the most challenging tasks in atmospheric sciences. The current methods of nowcasting primarily rely on inferring precipitation from radar reflectivity, which inevitably leads to uncertainties in forecasts due to the limitations of single radar data in capturing the detailed initial conditions of ...
Cuixian Lu, Quanfei Wang, Yuxin Zheng, Xiaohong Zhang, Jiafeng Li, Xuanzhen Zhang, Galina Dick, Jonathan Jones   +7 more
wiley   +1 more source

Circulatory pro‐CTSD binds brain endothelial LRP1 to trigger its lysosomal degradation leading to amyloid beta clearance deficit in Alzheimer's disease mice

Alzheimer's &Dementia, Volume 22, Issue 5, May 2026.
Abstract INTRODUCTION Clearance of cerebral Aβ was primarily mediated by the brain endothelial transporters including LRP1. The regulatory mechanism of LRP1 expression remained unclear. METHODS LRP1 in brain endothelial cells treated with pro‐CTSD were analyzed by western blot.
Zhi‐Jun Li, Zhao Yang, Dan Zhao, Yi‐Hua Qiu, Wen‐Yu Wan, Zeng‐Kang Huang, Li Tian, Rui‐Qun Qi, Hong‐Guang Liu, Yu‐Hua Chen, Dong‐Yu Min, Xiao‐Qian Xu, Wei‐Dong Zhao   +12 more
wiley   +1 more source

f–f Transition in Er(OH)3 Promotes Photosynthesis of H2O2 Coupling With Oxidation of Benzylamine Over Sodium Poly(heptazine imides)

Rare Metals, Volume 45, Issue 5, May 2026.
ABSTRACT f–f electronic transitions of rare‐earth elements typically exhibit unique physicochemical properties that benefit the photocatalytic performance of the catalysts containing the elements. Although conventional rare‐earth metal oxides or single‐atom doping in semiconductors have been extensively studied, the construction of heterojunction ...
Yang‐Sen Xu, Liyi Tang, Yu‐Xiang Yu, Yunxiao Zhang, Xiao Yan, Yangke Long, Wei‐De Zhang   +6 more
wiley   +1 more source

Exploring the Relationship Between Groundwater Drought and Evapotranspiration With the JULES Land Surface Model in a UK Chalk Catchment

Hydrological Processes, Volume 40, Issue 4, April 2026.
In the UK, there is contradictory evidence as to whether climate warming is worsening groundwater drought through increased evapotranspiration (ET) or whether increased ET is compensated by rising winter rainfall. We integrated a groundwater model into the JULES land surface model.
Sarah L. Collins, Alberto Martínez‐de la Torre, Johanna Scheidegger, Douglas B. Clark, Andrew Hughes   +4 more
wiley   +1 more source

A Window‐Augmented Machine Learning Approach for Direct GNSS Precipitable Water Vapor Retrieval

Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 2, April 2026.
Abstract Global Navigation Satellite Systems (GNSS) provide an effective means for remote sensing of precipitable water vapor (PWV). However, conventional GNSS‐based PWV retrieval approaches rely heavily on auxiliary meteorological parameters, which are frequently unavailable in real time, while most direct retrieval methods use station data aggregated
Zhouao Zheng, Haoyu Wang, Liangke Huang, Ziwei Li, Haojun Li, Hongxing Zhang, Junyu Li, Lilong Liu   +7 more
wiley   +1 more source