Bias corrections of long-term (1973-2004) daily precipitation data over the northern regions

Details Bias corrections of long-term (1973-2004) daily precipitation data over the northern regions Bias corrections of long-term (1973-2004) daily precipitation data over the northern regions

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3219501y&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 19, CiteID L19501

Physics

35

Hydrology: Instruments And Techniques: Monitoring, Geographic Location: Arctic Region (0718, 4207)

Scientific paper

A consistent daily bias correction procedure was applied at 4802 stations over high latitude regions (North of 45°N) to quantify the precipitation gauge measurement biases of wind-induced undercatch, wetting losses, and trace amount of precipitation for the last 30 years. These corrections have increased the gauge-measured monthly precipitation significantly by up to 22 mm for winter months, and slightly by about 5 mm during summer season. Relatively, the correction factors (CF) are small in summer (10%), and very large in winter (80-120%) because of the increased effect of wind on gauge undercatch of snowfall. The CFs also vary over space particularly in snowfall season. Significant CF differences were found across the USA/Canada borders mainly due to differences in catch efficiency between the national gauges. Bias corrections generally enhance monthly precipitation trends by 5-20%. These results point to a need to review our current understanding of the Arctic fresh water budget and its change.

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