Reinhold Steinacker Department of Meteorology and Geophysics

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Presentation transcript:

Monitoring of surface weather conditions over complex topography with VERA Reinhold Steinacker Department of Meteorology and Geophysics University of Vienna, Austria Steinacker SIRWEC QUEBEC 5. - 7. 1. 2010

OUTLINE ● temperature analysis over complex terrain ● concept of the minimum topography ● application to road temperature ● precipitation downscaling ● conclusion and outlook Steinacker SIRWEC QUEBEC 5. - 7. 1. 2010

OUTLINE ✓ temperature fields over complex terrain ● concept of the minimum topography ● application to road temperature ● precipitation downscaling ● conclusion and outlook Steinacker SIRWEC QUEBEC 5. - 7. 1. 2010

WRF-Model 10 km res → too coarse To resolve complex topography Steinacker SIRWEC QUEBEC 5. - 7. 1. 2010

WRF-Model topography → too coarse To resolve complex Topography RMS difference of grid point Elevation 10km – 0,05 km O(100m) Steinacker SIRWEC QUEBEC 5. - 7. 1. 2010

real topography (1 km resolution) → RMS difference of grid point Elevation 1km – 0,05 km O(10m) Steinacker SIRWEC QUEBEC 5. - 7. 1. 2010

Observation interpolation 10 km res oC Observation interpolation 10 km res → station elevation and hence temperature varies strongly over complex terrain No incorporation of real topography Steinacker SIRWEC QUEBEC 5. - 7. 1. 2010

Main roads go basically along valleys © metgis Steinacker SIRWEC QUEBEC 5. - 7. 1. 2010

OUTLINE ✓ temperature fields over complex terrain ✓ concept of the minimum topography ● application to road temperature ● precipitation downscaling ● conclusion and outlook Steinacker SIRWEC QUEBEC 5. - 7. 1. 2010

The surface-Temperature field in the Alpine region shows a high similarity to the topography itself → Minimum Topography topography envelope topography mean topography minimum topography Steinacker SIRWEC QUEBEC 5. - 7. 1. 2010

Steinacker SIRWEC QUEBEC 5. - 7. 1. 2010

Objective station selection Steinacker SIRWEC QUEBEC 5. - 7. 1. 2010

Temperature along valley floors and low lands (at minum topography) Steinacker SIRWEC QUEBEC 5. - 7. 1. 2010

Main roads go basically along valleys © metgis Steinacker SIRWEC QUEBEC 5. - 7. 1. 2010

Observed temperature along the minimum topography Sa Observed temperature along the minimum topography Sa. 2010-01-30 01:00MEZ Steinacker SIRWEC QUEBEC 5. - 7. 1. 2010 © metgis

OUTLINE ✓ temperature fields over complex terrain ✓ concept of the minimum topography ✓ application to road temperature ● precipitation downscaling ● conclusion and outlook Steinacker SIRWEC QUEBEC 5. - 7. 1. 2010

(blue) along a (horizontal) section of a highway in an Alpine valley Comparison of the air temperatur of a synoptic station (red), two close-by road weather stations (light and dark green) and a close-by VERA gridpoint (blue) along a (horizontal) section of a highway in an Alpine valley → Differences due to a different micro-climate may exceed 5 oC ! Steinacker SIRWEC QUEBEC 5. - 7. 1. 2010

Weather patterns allows a downscaling and a short term variational Statistical evaluation of differences with respect to different synoptic Weather patterns allows a downscaling and a short term variational prediction of air temperatures along road sectors. Furthermore a correlation bitween air and road surface temperatures may be carried out for a refinement of the prediction of road surface conditions Steinacker SIRWEC QUEBEC 5. - 7. 1. 2010

OUTLINE ✓ temperature fields over complex terrain ✓ concept of the minimum topography ✓ application to road temperature ✓ precipitation downscaling ● conclusion and outlook Steinacker SIRWEC QUEBEC 5. - 7. 1. 2010

For a realistic Precip- itation monitoring → Radar Analyse ohne Fingerprints Real time rain gauges Are way too coarse For a realistic Precip- itation monitoring → Radar Radar downscaling 100 km Steinacker SIRWEC QUEBEC 5. - 7. 1. 2010

Radar gives a sufficient spatiotemporal pattern but especially over (fingerprint) Radar gives a sufficient spatiotemporal pattern but especially over complex terrain the quantitative information Is not adequate → variational blending of in situ and Radar information Radar downscaling 100 km Steinacker SIRWEC QUEBEC 5. - 7. 1. 2010

downscaled analysis Steinacker SIRWEC QUEBEC 5. - 7. 1. 2010

gauge analysis 100 km Steinacker SIRWEC QUEBEC 5. - 7. 1. 2010

OUTLINE ✓ temperature fields over complex terrain ✓ concept of the minimum topography ✓ application to road temperature ✓ precipitation downscaling ✓ conclusion and outlook Steinacker SIRWEC QUEBEC 5. - 7. 1. 2010

Road weather monitoring and forecasting represents one of the most challenging meteorological problems due to the need of resolving small spatio-temporal scales and to consider microclimatological variations. Hence, possibly all sources of meteorological information shall be utilized: In situ observations, remotely sensed data, NWP-models and (micro-) climatological information. Blending and downscaling techniques of these different sources of information promise the best possible result for the safety and comfort of road traffic www.univie.ac.at/amk/vera/ www.univie.ac.at/amk/metgis/index.htm Steinacker SIRWEC QUEBEC 5. - 7. 1. 2010

Thank you Steinacker SIRWEC QUEBEC 5. - 7. 1. 2010

Steinacker SIRWEC QUEBEC 5. - 7. 1. 2010

Steinacker SIRWEC QUEBEC 5. - 7. 1. 2010