Preconditions to ground based GPS water vapour tomography
نویسنده
چکیده
The GPS water vapour tomography is a new technique which provides spatially resolved water vapour distributions in the atmosphere under all weather conditions. This work investigates the information contained in a given set of GPS signals as a precondition to an optimal tomographic reconstruction. The spatial distribution of the geometric intersection points between different ray paths is used to estimate the information density. Different distributions of intersection points obtained from hypothetical GPS networks with varying densities of GPS stations are compared with respect to the horizontal and vertical resolution of a subsequent tomographic reconstruction. As a result some minimum requirements for continuously operating extensive GPS networks for meteorological applications are given.
منابع مشابه
GNSS troposphere tomography based on two-step reconstructions using GPS observations and COSMIC profiles
Traditionally, balloon-based radiosonde soundings are used to study the spatial distribution of atmospheric water vapour. However, this approach cannot be frequently employed due to its high cost. In contrast, GPS tomography technique can obtain water vapour in a high temporal resolution. In the tomography technique, an iterative or non-iterative reconstruction algorithm is usually utilised to ...
متن کاملObservations of precipitable water vapour over complex topography of Ethiopia from ground-based GPS, FTIR, radiosonde and ERA-Interim reanalysis
Water vapour is one of the most important greenhouse gases. Long-term changes in the amount of water vapour in the atmosphere need to be monitored not only for its direct role as a greenhouse gas but also because of its role in amplifying other feedbacks such as clouds and albedo. In recent decades, monitoring of water vapour on a regular and continuous basis has become possible as a result of ...
متن کاملSome problems in water vapor tomography
The technical success and availability of numerical algorithms have promoted the implementation of tomography to atmospheric sciences. The principal specific character in initial constraints, data collection and assimilation methods, obtaining the final numerical results and interpretation of these makes the continuation of success story for GPS-tomography very challenging. The authors use nume...
متن کاملThe STARTWAVE atmospheric water database
The STARTWAVE (STudies in Atmospheric Radiative Transfer and Water Vapour Effects) project aims to investigate the role which water vapour plays in the climate system, and in particular its interaction with radiation. Within this framework, an ongoing water vapour database project was set up which comprises integrated water vapour (IWV) measurements made over the last ten years by ground-based ...
متن کاملNear real-time estimation of water vapour in the troposphere using ground GNSS and the meteorological data
The near real-time (NRT) high resolution water vapour distribution models can be constructed based on GNSS observations delivered from Ground Base Augmentation Systems (GBAS) and ground meteorological data. Since 2008 in the territory of Poland, a GBAS system called ASGEUPOS (Active Geodetic Network) has been operating. This paper addresses the problems concerning construction of the NRT model ...
متن کامل