Dynamical processes related to cyclone development near Greenland

Ragnhild Bieltvedt Skeie*, Jón Egill Kristjánsson, Haraldur Ólafsson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A cyclone that caused heavy snowfall and winds exceeding 30 m/s over E-Greenland and N-Iceland on 20-21 September 2003 is investigated. Numerical simulations are conducted to assess the role of Greenland's orography for the development, as well as to evaluate the significance of other factors such as latent heating, SST and SST gradients. The simulations reveal that the cyclone evolution is strongly affected by the orography of Greenland. When orography is removed, a deep, well organized baroclinic low develops rapidly and moves eastward at 75°N. Conversely, in the control run the evolution of the primary baroclinic low is greatly suppressed by the orographic retardation of the warm air ahead of and the cold air behind the low. At the same time, a secondary low off Greenland's east coast at 68°N intensifies due to a coupling between an approaching upper level PV-anomaly and a lower level PV-anomaly generated from lee effects. This secondary low then moves eastward and causes extreme weather conditions, as observed. Further sensitivity experiments show that latent heating contributes to deepen the low, while SST gradients and SST in general contribute relatively little.

Original languageEnglish
Pages (from-to)512-515
Number of pages4
JournalHrvatski Meteoroloski Casopis
Issue number40
Publication statusPublished - 2005

Other keywords

  • Cyclone development
  • Greenland
  • Latent heat
  • Orography

Fingerprint

Dive into the research topics of 'Dynamical processes related to cyclone development near Greenland'. Together they form a unique fingerprint.

Cite this