1 / 9

Radar beam refraction modelling

Nordic weather radar workshop Helsinki 3.10.-4.10.2002. Radar beam refraction modelling. Uta Gjertsen, met.no, FoU.

Download Presentation

Radar beam refraction modelling

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Nordic weather radar workshop Helsinki 3.10.-4.10.2002 Radar beam refraction modelling Uta Gjertsen, met.no, FoU

  2. For the quantitative use of weather radar data in Norway it is essential to correct for beam shielding. The degree of beam shielding is variable due to changes in atmospheric humidity and temperature profiles. In the near future we will implement a model deriving the degree of beam blockage from actual radiosonde profiles. The model will increase the accuracy of the shielding correction and identify regions where data is missing due to anaprop. The model gives also an indication on situations with beam splitting. Beam splitting can produce large errors and is difficult to identify from NWP model or radar data alone.

  3. Today’s precipitation composite • Spatial gauge adjustment with mean monthly gauge/radar factors • Precipitation intensity • Accumulated precipitation

  4. Accumulated precipitation

  5. Radar Oslo:Mean daily precipitation for a winter and spring season, beam blocking and topography

  6. Beamsplitting:Radar beam height as a function of distance modeled from radiosonde data 16.8.2002 (elevation = 0.5 degrees, radar Oslo)

  7. Beam shielding west of radar Oslo 16.8.2002 Lower edge height of radar beam Blue line: measurement volume Red line: meausrement volume after beam blockage Dashed red line: measurement volume from standard atmosphere

  8. Beam splitting east of radar Oslo 16.8.2002

  9. Examples for vertical humidity and temperature profiles causing anaprop.

More Related