Revisiting the impact of mid-latitude cold air outbreaks on the Maritime Continent weather

M. R. Abdillah, T. Iwasaki

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)

Abstract

The East Asian winter exhibits frequent cold air outbreaks (CAOs), or cold surges, which often cause severe cold waves in the extratropics. CAOs are also of importance for forecasters in the Maritime Continent because the associated equatorward outflows can influence tropical weather. Various CAO definitions have been documented, but a definition based on a quantitative approach was only recently proposed. Studies of the CAO impact often linked a surge index in the subtropics instead of an index in the midlatitude where CAOs basically occur. Here, we investigate the impact by using a quantitative CAO index, which is defined by integrating cold air mass flux below a threshold potential temperature over midlatitude East Asia (45°N, 90°-135°E). From a climatological analysis, tropical convections are significantly observed two-to-four days following CAO event (i.e., the peak of CAO index), indicating CAO impacts. However, case studies show that the impacts vary among independent CAO cases due to influences of associated synoptic conditions, which affect the pathways of northerlies propagation and consequently hinder or amplify the impacts. Several impact patterns and their possible causes are discussed. A better understanding of East Asian CAO variability can improve the predictability of weather over the Maritime Continent.

Original languageEnglish
Article number012062
JournalIOP Conference Series: Earth and Environmental Science
Volume303
Issue number1
DOIs
Publication statusPublished - 2019 Aug 2
Event1st International Conference on Tropical Meteorology and Atmospheric Science, ICTMAS 2018 - Bandung, West Java, Indonesia
Duration: 2018 Sep 192018 Sep 20

Keywords

  • cold air outbreaks
  • maritime continent
  • weather

ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

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