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Proceedings Paper

Impact of Doppler lidar wind observations on a single-level meteorological analysis
Author(s): Lars Peter Riishojgaard; Robert M. Atlas; George David Emmitt
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Paper Abstract

Through the use of observation operators, modern data assimilation systems can ingest observations of quantities that are not themselves model variables, but are mathematically related to those variables. An example of this are the LOS (line of sight) winds that Doppler wind lidars provide. The model - or data assimilation system - needs information about both components of the horizontal wind vectors, whereas the individual observations in this case only provide the projection of the wind vector onto a given direction. In order to assess the expected impact of such an observing system, it is important to examine the extent to which a meteorological analysis can be constrained by the LOS winds. A single-level wind analysis system designed to explore these issues has been built at the NASA Data Assimilation Office. In this system, simulated wind observations can be evaluated in terms of their impact on the analysis quality under various assumptions about their spatial and angular distributions as well as the observation error characteristics. The basic design of the system will be presented along with experimental results obtained with it. In particular, the value of measuring LOS winds along two different directions for a given location will be discussed.

Paper Details

Date Published: 9 January 2002
PDF: 10 pages
Proc. SPIE 4484, Lidar Remote Sensing for Industry and Environment Monitoring II, (9 January 2002); doi: 10.1117/12.452789
Show Author Affiliations
Lars Peter Riishojgaard, NASA Goddard Space Flight Ctr. (United States)
Robert M. Atlas, NASA Goddard Space Flight Ctr. (United States)
George David Emmitt, Simpson Weather Associates, Inc. (United States)


Published in SPIE Proceedings Vol. 4484:
Lidar Remote Sensing for Industry and Environment Monitoring II
Upendra N. Singh, Editor(s)

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