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


Autoria(s): Lüpkes, Christof; Schlünzen, K Heinke
Cobertura

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

Data(s)

03/02/1996

Resumo

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).

Formato

text/tab-separated-values, 13192 data points

Identificador

https://doi.pangaea.de/10.1594/PANGAEA.857807

doi:10.1594/PANGAEA.857807

Idioma(s)

en

Publicador

PANGAEA

Relação

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, doi:10.2312/BzP_0133_1994

Description of data (URI: hdl:10013/epic.46754.d001)

Direitos

CC-BY: Creative Commons Attribution 3.0 Unported

Access constraints: unrestricted

Fonte

Supplement to: Lüpkes, Christof; Schlünzen, K Heinke (1996): Modelling the arctic convective boundary-layer with different turbulence parameterizations. Boundary-Layer Meteorology, 79(1-2), 107-130, doi:10.1007/BF00120077

Palavras-Chave #DATE/TIME; Dew/frost point; DFG-Schwerpunktprogramm 1158 - Antarktisforschung; DFG-SPP1158; Dropsonde; DS; Elapsed time; Event label; HEIGHT above ground; Humidity, relative; Humidity, specific; Latitude of event; Longitude of event; POLAR 4; Pressure, at given altitude; Radiation and Eddy Flux Experiment; REFLEX II; REFLEX-II_a4f; REFLEX-II_b4f; REFLEX-II_c4f; REFLEX-II_d4f; REFLEX-II_e4f; REFLEX-II_f4f; REFLEX-II_g4f; REFLEX-II_h4f; Temperature, air; Temperature, air, potential; Wind direction; Wind velocity, south-north; Wind velocity, west-east
Tipo

Dataset