Characteristics and impact of a gale-force storm field over the Norwegian Sea

Burghard Brümmer, Gerd Müller, Christian Klepp, Gunnar Spreen, Roland Romeiser, Jochen Horstmann

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

A unique data set was sampled by aircraft, ship, drift buoys and satellites in a strong storm event which occurred over the Norwegian Sea in March 2005 during the LOFZY field experiment. The atmospheric characteristics and the impact on the upper ocean are investigated. The storm field with winds up to 27 m s-1 was situated on the west-side of a low-pressure trough along the Norwegian coast and was marked by a sharp wind front. The entire system of trough, front and storm field was about 200 km wide, had a lifetime of 2 d in the area and advanced at 1-3 m s-1 SE-wards. Temperature contrast across the system was small, but wind contrast was remarkable and concentrated in a step-like front with 5-15 m s-1 difference over a distance of 3 km. The entire system was restricted to the lowest 2 km. It was accompanied by wide-spread rain and snow. Precipitation slightly surpassed evaporation (0.22 mm h-1). Surface heat fluxes amounted up to 400 W m-2. However, they cannot account for the observed sea surface temperature changes between -0.8 and +0.1 K within 6 h during the frontal passage. This is attributed to vertical mixing in the ocean caused by the frontal wind impact and superimposed to pre-existing mesoscale eddy circulations. The mixing acted on a temperature stratification in the uppermost 20-100 m which was opposite on both sides of the Norwegian Current.

Original languageEnglish (US)
Pages (from-to)481-496
Number of pages16
JournalTellus, Series A: Dynamic Meteorology and Oceanography
Volume62
Issue number4
DOIs
StatePublished - Aug 2010

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trough
mesoscale eddy
upper ocean
vertical mixing
heat flux
low pressure
aircraft
stratification
sea surface temperature
evaporation
snow
temperature
sea
coast
ocean
rain
ship
field experiment

ASJC Scopus subject areas

  • Atmospheric Science
  • Oceanography

Cite this

Characteristics and impact of a gale-force storm field over the Norwegian Sea. / Brümmer, Burghard; Müller, Gerd; Klepp, Christian; Spreen, Gunnar; Romeiser, Roland; Horstmann, Jochen.

In: Tellus, Series A: Dynamic Meteorology and Oceanography, Vol. 62, No. 4, 08.2010, p. 481-496.

Research output: Contribution to journalArticle

Brümmer, Burghard ; Müller, Gerd ; Klepp, Christian ; Spreen, Gunnar ; Romeiser, Roland ; Horstmann, Jochen. / Characteristics and impact of a gale-force storm field over the Norwegian Sea. In: Tellus, Series A: Dynamic Meteorology and Oceanography. 2010 ; Vol. 62, No. 4. pp. 481-496.
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