Variability of surface wind directions over Finnmark, Norway, and coupling to the larger-scale atmospheric circulation

Nawri, Nikolai; Harstveit, Knut

doi:10.1007/s00704-011-0458-0

Cited by 2 publications

(5 citation statements)

References 18 publications

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“…Unfortunately, there are no longterm records for the latter part to estimate this difference. Nevertheless, close analogies can be drawn between the wind climate and its attribution to the wind driving mechanisms found in the statistical analysis of the northern Norwegian fjords by Nawri and Harstveit [26] and the wind climate and its attribution reported in this study for the Arctic fjord. Simulations by Kilpeläinen et al [13] suggest that the difference in temperature could be as large as +3 K. The development of the breeze circulation in the valley can have such warming effect through frequent entrainment and recirculation of the warmer marine air in the valley.…”

Section: R0sfsupporting

confidence: 78%

“…The more detailed analysis of the structural feature of the wind climatology is obtained through development of the wind diagram methodology previously utilized in Cogliati and Mazzeo [25] and Nawri and Harstveit [26]. Probabilities to find certain wind direction at two levels in the atmosphere are shown in Figure 3.…”

Section: Wind Climatologymentioning

confidence: 99%

“…Our statistical analysis has demonstrated that the mean background wind above the valley is about 10 m s −1 . The background wind can significantly modify circulations in the valley as it imposes additional mechanical forcing [14,26]. According to Doran [14], the mechanical driving creates higher pressure in the valley.…”

Section: Numerical Simulations Of the Wind Patterns Induced By Differmentioning

confidence: 99%

“…Cogliati and Mazzeo [25] applied the diagrams to study the valley wind climate utilizing only a limited number of observations. Recently, Nawri and Harstveit [26] have applied the diagrams to study the wind climate and to attribute the wind driving mechanisms in the Northern Norwegian fjords in Finnmark. In particular, they concluded that a clear separation between different prevailing surface wind directions in each season can be achieved based exclusively on the local mean sea level geostrophic wind direction.…”

Section: Introductionmentioning

confidence: 99%

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Wind Climate in Kongsfjorden, Svalbard, and Attribution of Leading Wind Driving Mechanisms through Turbulence-Resolving Simulations

Esau

Репина

2012

Advances in Meteorology

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This paper presents analysis of wind climate of the Kongsfjorden-Kongsvegen valley, Svalbard. The Kongsfjorden-Kongsvegen valley is relatively densely covered with meteorological observations, which facilitate joint statistical analysis of the turbulent surface layer structure and the structure of the higher atmospheric layers. Wind direction diagrams reveal strong wind channeled in the surface layer up to 300 m to 500 m. The probability analysis links strong wind channeling and cold temperature anomalies in the surface layer. To explain these links, previous studies suggested the katabatic wind flow mechanism as the leading driver responsible for the observed wind climatology. In this paper, idealized turbulence-resolving simulations are used to distinct between different wind driving mechanisms. The simulations were performed with the real surface topography at resolution of about 60 m. These simulations resolve the obstacle-induced turbulence and the turbulence in the non-stratified boundary layer core. The simulations suggest the leading roles of the thermal land-sea breeze circulation and the mechanical wind channeling in the modulation of the valley winds. The characteristic signatures of the developed down-slope gravity-accelerated flow, that is, the katabatic wind, were found to be of lesser significance under typical meteorological conditions in the valley.

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Section: R0sfsupporting

confidence: 78%

Section: Wind Climatologymentioning

confidence: 99%

Section: Numerical Simulations Of the Wind Patterns Induced By Differmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Wind Climate in Kongsfjorden, Svalbard, and Attribution of Leading Wind Driving Mechanisms through Turbulence-Resolving Simulations

Esau

Репина

2012

Advances in Meteorology

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“…Situated on a peninsula surrounded by fjords, Langfjordjøkelen is under the influence of the prevailing westerly to southwesterly winds, bringing in moist air from the Norwegian Sea (e.g. Rasmussen and Conway, 2005; Nawri and Harstveit, 2012). A comparison of digital terrain models from 1966 and 2008 revealed that Langfjordjøkelen has thinned over the entire elevation range, with values of >100 m in the lower parts (Andreassen and others, 2012).…”

Section: Settingmentioning

confidence: 99%

Surface energy balance in the ablation zone of Langfjordjøkelen, an arctic, maritime glacier in northern Norway

et al. 2014

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Glaciers in northern and southern Norway are subject to different daily and seasonal cycles of incoming solar radiation, which is presumably reflected in the importance of net solar radiation in their surface energy balance. We present a 3 year continuous record from an automatic weather station in the ablation zone of the ice cap Langfjordjøkelen, one of the most northerly glaciers of mainland Norway. Despite its location at 70º N, Langfjordjøkelen was found to have a maritime climate, with an annual mean air temperature of –1.08C, frequent cloud cover and end-of-winter snow depths over 3 m in all three years. The main melt season was May–October, but occasional melt events occurred on warm, cloudy winter days. Net solar and longwave radiation together accounted for 58% of the melt energy, with a positive contribution by net longwave radiation (7%). The sensible and latent heat fluxes supplied the remainder of the melt energy. Cloud optical thickness over Langfjordjøkelen was larger than on two glaciers in southern Norway, especially in the summer months. This resulted in a smaller contribution of net solar radiation to surface melt on Langfjordjøkelen; the effect of the higher latitude on net solar radiation was found to be small.

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Variability of surface wind directions over Finnmark, Norway, and coupling to the larger-scale atmospheric circulation

Cited by 2 publications

References 18 publications

Wind Climate in Kongsfjorden, Svalbard, and Attribution of Leading Wind Driving Mechanisms through Turbulence-Resolving Simulations

Wind Climate in Kongsfjorden, Svalbard, and Attribution of Leading Wind Driving Mechanisms through Turbulence-Resolving Simulations

Surface energy balance in the ablation zone of Langfjordjøkelen, an arctic, maritime glacier in northern Norway

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