Visibility and present weather observations from the high-Arctic ASCOS expedition 2008

Jussi Paatero

Visibility data was collected using a Vaisala visibility sensor based on forward scattered laser light deployed on the aft starboard side on the 7th deck of the Icebreaker Oden. The visibility sensor is combined with a sensor that measures precipitation intensity and accumulated presentation, and generates the WMO present-weather synop code. The location of this sensor likely leads to an underestimation of precipitation.

Citation

Jussi Paatero (2018) Visibility and present weather observations from the high-Arctic ASCOS expedition 2008. Dataset version 1. Bolin Centre Database. https://doi.org/10.17043/oden-ascos-2008-weather-visibility-1

References

Tjernström, M. et al. 2014. The Arctic Summer Cloud Ocean Study (ASCOS): overview and experimental design. Atmospheric Chemistry and Physics, 14, 2823–2869. https://doi.org/10.5194/acp-14-2823-2014

Data description

Finnish Meteorological Institute, present weather and visibility data.
Measurement method: Vaisala FD12P onboard Oden, 7th deck

Comments

Two visibility sensor based on forward scattered laser light was deployed; one that comes with the Oden weather station and one that was deployed only during the ice drift. Both were deployed on the 7th deck; the weather station sensor on the roof of the starboard container and the FMI sensor on the aft starboard side. The Vaisala visibility sensor is combined with a sensor that also measures precipitation intensity and accumulated presentation, and generates the WMO present-weather synop code; hence the name. Note that the location of this sensor likely leeds to an unmderestimation of precipitation, since very light precipitation (droplets or ice crystals) are probly lofted by the flow distortion around the superstructure, often causing upwinds at this location The visibility data from the Oden weather station is an intgral part of the weather station data file.

Original address: http://www.ascos.se/index.php?q=node/274

Files:
ASCOS_Present_weather_data_FMI.xls (2.9 MB)
FD12P_Present weather_codes_0.pdf (654.11 KB)