Results 31 to 40 of about 376 (139)

GNSS Data Processing and Validation of the Altimeter Zenith Wet Delay around the Wanshan Calibration Site

Remote Sensing, 2022
The Wanshan calibration site (WSCS) is the first in-situ field for calibration and validation (Cal/Val) of HY-2 satellite series in China. It was built in December, 2018 and began business operation in 2020.
Wanlin Zhai, Jianhua Zhu, Mingsen Lin, Chaofei Ma, Chuntao Chen, Xiaoqi Huang, Yufei Zhang, Wu Zhou, He Wang, Longhao Yan   +9 more
doaj   +1 more source

Long-term ZTD and ZWD series and climate normals using NCEP1

, 2020
<p>The World Meteorological Organization (WMO) recommends the use of climate normals for dealing with the analysis of variations and trends of the meteorological parameters or be used as input to predictive climate models. The suggested period is 30 years, but shorter periods can also be employed.
Marcelo C. Santos, Marlon Moura, Thalia Nikolaidou, Kyriakos Balidakis   +3 more
openaire   +2 more sources

Performance of Zero Water Discharge (ZWD) System with Nitrifying Bacteria and Microalgae Chaetoceros calcitrans Components in Super Intensive White Shrimp (Litopenaeus vannamei) Culture [PDF]

Journal of Aquaculture Research & Development, 2015
This research was aimed to study the performance of Zero Water Discharge (ZWD) by using nitrifying bacteria and microalgae Chaetoceros calcitrans in super intensive white shrimp (Litopenaeus vannamei) culture. The study consists of three consecutive steps: (1) activating and cultivating of nitrifying bacteria and microalgae C.
Suantika G Lumbantoruan G, Muhammad H Azizah FFN   +1 more
openaire   +1 more source

Establishment and Evaluation of a New Meteorological Observation-Based Grid Model for Estimating Zenith Wet Delay in Ground-Based Global Navigation Satellite System (GNSS)

Remote Sensing, 2018
With the availability to high-accuracy a priori zenith wet delay (ZWD) data, the positioning efficiency of the precise point positioning (PPP) processing can be effectively improved, including accelerating the convergence time and improving the ...
Yibin Yao, Zhangyu Sun, Chaoqian Xu
doaj   +1 more source

A new vertical reduction model for enhancing the interpolation accuracy of VMF1/VMF3 tropospheric delay products [PDF]

Geoscientific Model Development
Grid-wise Vienna Mapping Functions 1 (VMF1) and Vienna Mapping Functions 3 (VMF3) tropospheric products are widely used to interpolate the a priori zenith hydrostatic delay (ZHD) and zenith wet delay (ZWD) over GNSS (Global Navigation Satellite Systems ...
P. Sun, K. Zhang, K. Zhang, D. Zhu, S. Shi, X. Liu, D. Zhao, M. Zhang, S. Wu   +8 more
doaj   +1 more source

Improving GNSS Meteorology by Fusing Measurements of Several Colocated Receivers on the Observation Level

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Zenith wet delay (ZWD) estimation is a key component for the global navigation satellite system (GNSS) meteorology. At present, the zenith hydrostatic delay can be computed with sufficient accuracy by means of empirical models, while the ZWD, which is ...
Rui Wang, Grzegorz Marut, Tomasz Hadas, Thomas Hobiger   +3 more
doaj   +1 more source

A zenith wet delay improved model in China based on GPT3 and random forest

Geodesy and Geodynamics
Zenith wet delay (ZWD) is a key parameter for the precise positioning of global navigation satellite systems (GNSS) and occupies a central role in meteorological research.
Shaoni Chen, Chunhua Jiang, Xiang Gao, Huizhong Zhu, Shuaimin Wang, Guangsheng Liu   +5 more
doaj   +1 more source

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

Major Melting Event on the Ross Ice Shelf, Antarctica, Connected With Enhanced Atmospheric Turbulence

Geophysical Research Letters, Volume 53, Issue 5, 16 March 2026.
Abstract The Ross Ice Shelf (RIS) in West Antarctica experienced extensive surface melting in January 2016, driven by warm humid air transported from over the Southern Ocean. Few studies have reported increased atmospheric water vapor and turbulent mixing during this event in this region, where the availability of surface measurements is challenging ...
Dhiman R. Mondal, Pedro Elosegui, Nathra Ramrajvel, Scott Paine   +3 more
wiley   +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