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Lüpkes, Christof; Schlünzen, K Heinke (1996): 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. PANGAEA,, Supplement to: Lüpkes, C; Schlünzen, KH (1996): Modelling the arctic convective boundary-layer with different turbulence parameterizations. Boundary-Layer Meteorology, 79(1-2), 107-130,

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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).
Related to:
Kottmeier, Christoph; Hartmann, Jörg; Wamser, Christian; Bochert, Axel; Lüpkes, Christof; Freese, Dietmar; Cohrs, Wolfgang (1994): Radiation and Eddy Flux Experiment 1993 (REFLEX II). Berichte zur Polarforschung = Reports on Polar Research, 133, 62 pp,
Further details:
Median Latitude: 79.378465 * Median Longitude: 6.898919 * South-bound Latitude: 78.144560 * West-bound Longitude: 5.822580 * North-bound Latitude: 80.845310 * East-bound Longitude: 8.991280
Date/Time Start: 1993-03-04T11:56:52 * Date/Time End: 1993-03-04T13:23:25
Minimum HEIGHT above ground: 0.000 m * Maximum HEIGHT above ground: 2772.667 m
REFLEX-II_a4f * Latitude: 78.173400 * Longitude: 8.991280 * Date/Time: 1993-03-04T10:56:00 * Campaign: REFLEX II (Radiation and Eddy Flux Experiment) * Basis: POLAR 4 * Method/Device: Dropsonde (DS)
REFLEX-II_b4f * Latitude: 78.144560 * Longitude: 5.822580 * Date/Time: 1993-03-04T11:11:00 * Campaign: REFLEX II (Radiation and Eddy Flux Experiment) * Basis: POLAR 4 * Method/Device: Dropsonde (DS)
REFLEX-II_c4f * Latitude: 78.635690 * Longitude: 6.108570 * Date/Time: 1993-03-04T11:22:00 * Campaign: REFLEX II (Radiation and Eddy Flux Experiment) * Basis: POLAR 4 * Method/Device: Dropsonde (DS)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventLüpkes, Christof
2DATE/TIMEDate/TimeLüpkes, ChristofGeocode
3Latitude of eventLatitudeLüpkes, Christof
4Longitude of eventLongitudeLüpkes, Christof
5Elapsed timeETIMsLüpkes, Christoffrom drop
6Pressure, at given altitudePPPPhPaLüpkes, Christof
7Temperature, airTTT°CLüpkes, Christof
8Humidity, relativeRH%Lüpkes, Christofrelated to water
9Dew/frost pointTdTdTd°CLüpkes, Christof
10Wind directiondddegLüpkes, Christof
11HEIGHT above groundHeightmLüpkes, ChristofGeocode
12Wind velocity, west-eastUm/sLüpkes, Christof
13Wind velocity, south-northVm/sLüpkes, Christof
14Humidity, specificHumidity specg/kgLüpkes, Christof
15Temperature, air, potentialTHETAKLüpkes, Christof
16Humidity, relativeRH%Lüpkes, Christofrelated to ice
13192 data points

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