Retrieval of Six Years of ZTD Over the Oceans from a French Oceanographic Fleet Vessel Shipborne GNSS Antenna.
Abstract
The late 90s came with the development of high precision positioning, when GNSS (Global Navigation Satellite System) antennas have become essential elements. Their scope has broadened, allowing to compute atmospheric data above land, such as the ZTD (Zenith Troposphere Delay), thanks to the expanding network of GNSS ground stations. The amount of water vapor in the atmosphere can be derived from the ZTD, drawing a climatological information. Most recently, this approach has been applied to data acquired from shipborne antennas. By processing data acquired over several years by vessels sailing across the oceans, we are able to derive in-situ ZTD data over time and space, completing the sparse water vapor information obtained from satellite observation of the atmosphere above the sea. This in-situ information is prone to help better understand the climate processes impacting human activity all around the world, as well as their rapid change in recent years.This work aims at deriving the ZTD from a six-year long GNSS dataset from the Atalante research vessel, from 2015 to 2020.The resulting position and water vapor content are compared to the existing data such as ocean level and total water vapor content reanalysis from the ECMWF. A maximum error of 3kg/m2 on the water vapor content is expected, in order to reach the requirements of the literature.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2022
- Bibcode:
- 2022AGUFM.G33A..02P