Polar low tracks over the Nordic Seas: A 14-winter climatic analysis

Maxence Rojo, Chantal Claud, Paul Etienne Mallet, Gunnar Noer, Andrew Mark Carleton, Marie Vicomte

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

To develop a 14-winter (October-April; 1999-2013) climatic description of polar low (PL) occurrence for the Nordic Seas, systems have been tracked using images acquired from the Very High Resolution Radiometer (AVHRR). Also, the dominant PL characteristics - their temporal and spatial distributions, size, lifespan, distance travelled, speed of propagation and directions - have been determined. On average, 14 PL events occur per winter but there is strong inter-annual and intra-seasonal variability. Although systems may form and travel over the whole Nordic Seas, their genesis is enhanced in areas characterised by warm oceanic currents. At the start of the season (October-November), systems mainly form over the Greenland and Norwegian Seas, but further into winter they form increasingly over the Barents Sea. In connection with recent low-ice winters, new areas of PL formation are evident, particularly to the west of Spitsbergen and in the Barents Sea. PL speeds of propagation range between 5 and 13 m/s but are observed to be highly variable among cases and even during the lifespan of individual PLs. To a considerable extent, the direction of movement is controlled by the large-scale flow in the lowest atmospheric layers, but we also observed cyclonic co-rotation of some pairs of PLs due to their influence on the ambient flow. Although these generally move southward or southeastward, a substantial number of PLs have westward and even northward tracks. PLs in the western part of the region average larger than their eastern counterparts. This study also highlights that PLs characteristics and tracks differ according to weather regimes.

Original languageEnglish (US)
Article number24660
JournalTellus, Series A: Dynamic Meteorology and Oceanography
Volume67
Issue number1
DOIs
StatePublished - Jan 1 2015

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winter
oceanic current
temporal distribution
radiometer
spatial distribution
weather
ice
sea
analysis
speed
travel

All Science Journal Classification (ASJC) codes

  • Oceanography
  • Atmospheric Science

Cite this

Rojo, Maxence ; Claud, Chantal ; Mallet, Paul Etienne ; Noer, Gunnar ; Carleton, Andrew Mark ; Vicomte, Marie. / Polar low tracks over the Nordic Seas : A 14-winter climatic analysis. In: Tellus, Series A: Dynamic Meteorology and Oceanography. 2015 ; Vol. 67, No. 1.
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Polar low tracks over the Nordic Seas : A 14-winter climatic analysis. / Rojo, Maxence; Claud, Chantal; Mallet, Paul Etienne; Noer, Gunnar; Carleton, Andrew Mark; Vicomte, Marie.

In: Tellus, Series A: Dynamic Meteorology and Oceanography, Vol. 67, No. 1, 24660, 01.01.2015.

Research output: Contribution to journalArticle

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