Cold air mass analysis of the record-breaking cold surge event over east asia in January 2016

Junpei Yamaguchi, Yuki Kanno, Guixing Chen, Toshiki Iwasaki

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

An extreme cold surge event caused record-breaking low temperatures in East Asia during 20 – 25 January 2016. The planetary-and synoptic-scale feature of the event is investigated quantitatively using the isentropic cold air mass analysis with a threshold potential temperature of 280 K. Because cold air mass is an adiabatically conservative quantity, it is suitable for tracing and examining the extreme cold surges. We further introduced a metric named mean wind of cold air mass, which divides the factor of cold air mass evolution into convergence and advection parts. The new metric allowed us to trace the evolution of the cold air mass with dynamic consistency for a period of more than a week. A thick cold air mass built up over southern Sakha by a convergent cold air mass flow during 16 – 18 January. It migrated westward and reached Lake Baikal. On 20 January, an intense Siberian High developed, with an east-ward-moving mid-upper-level ridge, producing a strong surface pressure gradient over the coastal regions of the Asian continent. This ridge and a cutoff low to the adjacent east formed a northerly flow in the mid-upper troposphere. The resultant southward flow through the troposphere blew the cold air mass over 480 hPa in thickness to the subtropical region of East Asia, causing strong cold surges there on 24 and 25 January. The abnormality of the event is further quantified using extreme value theory. The cold air mass gradually became rare along the path of the cold air mass from Lake Baikal to eastern China, which experienced as thick a cold air mass as once in 200 years. The cold air mass itself shows little change in thickness. Therefore, the migration of a cold air mass over 540 hPa in thickness from northern Siberia is the major cause of this cold surge extreme.

Original languageEnglish
Pages (from-to)275-293
Number of pages19
JournalJournal of the Meteorological Society of Japan
Volume97
Issue number1
DOIs
Publication statusPublished - 2019

Keywords

  • Cold air mass
  • Cold air outbreak
  • Cold surge
  • East Asian winter monsoon
  • Extreme low temperature

ASJC Scopus subject areas

  • Atmospheric Science

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