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SWI workshop 08-12-2010Jesper Ellerbæk Nielsen

”Combining C-band and X-band weather radars for accurate precipitation measurements over urban areas”

Supervisors:Michael R. Rasmussen (AAU)

Rasphal Gill (DMI)Niels Ejner Jensen (DHI)

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Agenda

• Comparison of C- and X-band precipitation measurement• Investigation of drop size distributions

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Comparison of C- and X-band precipitation measurements

• How similar are the detection of the same precipitation events for the two radar systems?

• Are there situations where the radar systems has different strength and weaknesses?

• Is there a positive potential for integration of the two systems?

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Comparison of C- and X-band precipitation measurements

Setup for the experiment

120km

240km

15km

30km

60km

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Comparison of C- and X-band precipitation measurements

Static calibration for a two month period (1st of June to 31st July 2009)

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Comparison of C- and X-band precipitation measurements

Strengths and Weaknesses

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Comparison of C- and X-band precipitation measurements

Spatial correlation

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Comparison of C- and X-band precipitation measurements

C-band X-band

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Investigation of drop size distributions

Laser based distrometer – OTT Parsivel

Describing the precipitation by drop size and drop velocity

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Investigation of drop size distributions

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Investigation of drop size distributions

Convective event from 29 of June 2010

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Investigation of drop size distributions

Stratiform event from 29th-30th of July 2010

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Investigation of drop size distributions

Stratiform event from 29th-30th of July 2010

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Investigation of drop size distributions

Stratiform event from 29th-30th of July 2010

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Investigation of drop size distributions

Stratiform event from 29th-30th of July 2010

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C-band X-band