Synoptic climatology of winter daily temperature extremes in Sapporo, northern Japan

Extreme winter daily temperature is an important parameter for determining winter precipitation. This study used a principal component analysis and k-means clustering to characterize the circulation patterns of extreme daily temperatures for 19 winter seasons in Sapporo, Hokkaido, Japan. Climatologi...

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Bibliographic Details
Published in:International Journal of Climatology
Main Authors: Farukh, M. A., Yamada, Tomohito J.
Format: Article in Journal/Newspaper
Language:English
Published: John Wiley & Sons
Subjects:
Aleutian low
geopotential height
maximum daily temperature extreme
minimum daily temperature extreme
sea level pressure
Siberian high
451
aleutian low
Online Access:http://hdl.handle.net/2115/70682
https://doi.org/10.1002/joc.5329
Description
Summary:Extreme winter daily temperature is an important parameter for determining winter precipitation. This study used a principal component analysis and k-means clustering to characterize the circulation patterns of extreme daily temperatures for 19 winter seasons in Sapporo, Hokkaido, Japan. Climatological anomaly maps were constructed for sea level pressure (SLP) and the 500-hPa geopotential height for the identified minimum (Tmin(10); 239days) and maximum (Tmax(90); 236days) daily temperature extremes. The Tmax(90) SLP anomaly pattern was the opposite (west-east orientation) of the Tmin(10) pattern. The circulation patterns that predominantly contributed to winter rainfall were derived from cyclones over the Sea of Japan via instability created by abundant heat and moisture over the ocean and a strong positive 500-hPa height anomaly over Hokkaido.

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