Impact of Doppler lidar wind observations on a single-level meteorological analysis

Lars Peter Riishojgaard; Robert M. Atlas; George David Emmitt

doi:10.1117/12.452789

9 January 2002 Impact of Doppler lidar wind observations on a single-level meteorological analysis

Lars Peter Riishojgaard, Robert M. Atlas, George David Emmitt

Proceedings Volume 4484, Lidar Remote Sensing for Industry and Environment Monitoring II; (2002) https://doi.org/10.1117/12.452789
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

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.

Citation Download Citation

Lars Peter Riishojgaard, Robert M. Atlas, and George David Emmitt "Impact of Doppler lidar wind observations on a single-level meteorological analysis", Proc. SPIE 4484, Lidar Remote Sensing for Industry and Environment Monitoring II, (9 January 2002); https://doi.org/10.1117/12.452789

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