NDLI: Advancing solid earth science through improved atmosphere modeling

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Advancing solid earth science through improved atmosphere modeling

Content Provider	NASA Technical Reports Server (NTRS)
Author	Niell, A. E.
Copyright Year	2004
Description	We proposed to investigate and develop better models for the effect of the hydrostatic and water vapor components of the neutral atmosphere on delay for VLBI and GPS by using a Numerical Weather Model to better simulate realistic atmosphere conditions. By using a raytrace calculation through the model atmosphere at the times of actual VLBI observations, the potential improvement in geodetic results can be evaluated. Also, by calculating the actual variation of delays with elevation and azimuth, the errors in current mapping function models can be assessed. The VLBI data to be initially analyzed are the fifteen days of the CONT02 sessions of 2002 October which included eight stations. There are three segments to the research. 1) The PSU/NCAR fifth generation mesoscale numerical weather model (MM5) will be used to provide the state of the atmosphere with highest horizontal resolution of 3 km. 2) A three-dimensional raytrace program will be developed to determine the delays through the model atmosphere at the times and in the directions of the VLBI observations for each of the sites. 3) The VLBI data will be analyzed using both standard models for the atmosphere mapping functions and the mapping functions derived from the NWM raytracing.
File Size	829804
Page Count	2
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20040084667
Archival Resource Key	ark:/13960/t08w8ch0j
Language	English
Publisher Date	2004-07-27
Access Restriction	Open
Subject Keyword	Meteorology And Climatology Hydrostatics Very Long Base Interferometry Atmospheric Models Global Positioning System Earth Sciences Mathematical Models Mesoscale Phenomena Mesometeorology Water Vapor Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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