Not logged in
PANGAEA.
Data Publisher for Earth & Environmental Science

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 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.857807, 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, https://doi.org/10.1007/BF00120077

Always quote citation above when using data! You can download the citation in several formats below.

RIS CitationBibTeX CitationShow MapGoogle Earth

Abstract:
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, https://doi.org/10.2312/BzP_0133_1994
Further details:
Description of data. hdl:10013/epic.46754.d001
Funding:
German Research Foundation (DFG), grant/award no. 5472008: Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas
Coverage:
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
Event(s):
REFLEX-II_a4f * Latitude: 78.173400 * Longitude: 8.991280 * Date/Time: 1993-03-04T10:56:00 * Campaign: REFLEX_II_P4 (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_P4 (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_P4 (Radiation and Eddy Flux Experiment) * Basis: POLAR 4 * Method/Device: Dropsonde (DS)
Size:
13192 data points

Download Data

Download dataset as tab-delimited text — use the following character encoding:

View dataset as HTML (shows only first 2000 rows)