Charge and discharge of polar cold air mass in northern hemispheric winter. Issue 17 (3rd September 2015)

• Record Type: Journal Article
• Authors: Kanno, Yuki; Abdillah, Muhammad Rais; Iwasaki, Toshiki
• Is Part Of: Geophysical research letters. Volume 42:Issue 17(2015:Sep.)
• Page Start: 7187
• Page End: 7193
• Publication Date: 2015-09-03
• Subjects: Geophysics -- Periodicals; Planets -- Periodicals; Lunar geology -- Periodicals; 550
• DOI: 10.1002/2015GL065626
• Languages: English
• ISSNs: 0094-8276

Abstract

<abstract abstract-type="main"> <title>Abstract</title> <p>This study shows the variability of polar cold air mass amount below potential temperature of 280 K, and north of 45°N can be understood with a concept of charge and discharge, where anomalously large daily discharge indicates an intermittent occurrence of cold air outbreak. The polar cold air mass amount north of 45°N gradually charges up due to diabatic cooling but dramatically discharges due to cold air outbreak with a pulse width of about 5 days. Cold air outbreaks tend to bring colder winter in East Asia and the east coast of North America, while warmer winter prevails on the northern side of these regions. The cold air mass amount south of 45°N increases just after a cold air outbreak but returns to the normal level soon because of its life time of about 3 days. Therefore, monthly mean of total cold air mass amount in the Northern Hemisphere is negatively correlated with the monthly mean discharge.</p> </abstract>