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| Main Authors: | , |
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
1996
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| Online Access: | https://doi.org/10.1594/PANGAEA.857807 |
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| _version_ | 1867171839063621632 |
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| author | Lüpkes, Christof Schlünzen, K Heinke |
| author_facet | Lüpkes, Christof Schlünzen, K Heinke |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Different parameterizations of subgrid-scale fluxes are utilized in a nonhydrostatic and anelastic mesoscale model to study their influence on simulated Arctic cold air outbreaks. A local closure, a profile closure and two nonlocal closure schemes are applied, including an improved scheme, which is based on other nonlocal closures. It accounts for continuous subgrid-scale fluxes at the top of the surface layer and a continuous Prandtl number with respect to stratification. In the limit of neutral stratification the improved scheme gives eddy diffusivities similar to other parameterizations, whereas for strong unstable stratifications they become much larger and thus turbulent transports are more efficient. It is shown by comparison of model results with observations that the application of simple nonlocal closure schemes results in a more realistic simulation of a convective boundary layer than that of a local or a profile closure scheme. Improvements are due to the nonlocal formulation of the eddy diffusivities and to the inclusion of heat transport, which is independent of local gradients (countergradient transport). |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_857807 |
| institution | PANGAEA |
| language | en |
| publishDate | 1996 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Meteorological measurements from 8 dropsondes released during POLAR 4 flight on 1993-03-04 along a track orthogonal to the pack ice edge north west of Svalbard Lüpkes, Christof Schlünzen, K Heinke DATE/TIME; Dew/frost point; Dropsonde; DS; Elapsed time; Event label; HEIGHT above ground; Humidity, relative; Humidity, relative, with respect to ice; Humidity, specific; Latitude of event; Longitude of event; POLAR 4; Pressure, at given altitude; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; Radiation and Eddy Flux Experiment; REFLEX_II_P4; REFLEX-II_a4f; REFLEX-II_b4f; REFLEX-II_c4f; REFLEX-II_d4f; REFLEX-II_e4f; REFLEX-II_f4f; REFLEX-II_g4f; REFLEX-II_h4f; SPP1158; Temperature, air; Temperature, air, potential; Wind direction; Wind velocity, south-north; Wind velocity, west-east Different parameterizations of subgrid-scale fluxes are utilized in a nonhydrostatic and anelastic mesoscale model to study their influence on simulated Arctic cold air outbreaks. A local closure, a profile closure and two nonlocal closure schemes are applied, including an improved scheme, which is based on other nonlocal closures. It accounts for continuous subgrid-scale fluxes at the top of the surface layer and a continuous Prandtl number with respect to stratification. In the limit of neutral stratification the improved scheme gives eddy diffusivities similar to other parameterizations, whereas for strong unstable stratifications they become much larger and thus turbulent transports are more efficient. It is shown by comparison of model results with observations that the application of simple nonlocal closure schemes results in a more realistic simulation of a convective boundary layer than that of a local or a profile closure scheme. Improvements are due to the nonlocal formulation of the eddy diffusivities and to the inclusion of heat transport, which is independent of local gradients (countergradient transport). |
| title | Meteorological measurements from 8 dropsondes released during POLAR 4 flight on 1993-03-04 along a track orthogonal to the pack ice edge north west of Svalbard |
| topic | DATE/TIME; Dew/frost point; Dropsonde; DS; Elapsed time; Event label; HEIGHT above ground; Humidity, relative; Humidity, relative, with respect to ice; Humidity, specific; Latitude of event; Longitude of event; POLAR 4; Pressure, at given altitude; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; Radiation and Eddy Flux Experiment; REFLEX_II_P4; REFLEX-II_a4f; REFLEX-II_b4f; REFLEX-II_c4f; REFLEX-II_d4f; REFLEX-II_e4f; REFLEX-II_f4f; REFLEX-II_g4f; REFLEX-II_h4f; SPP1158; Temperature, air; Temperature, air, potential; Wind direction; Wind velocity, south-north; Wind velocity, west-east |
| url | https://doi.org/10.1594/PANGAEA.857807 |