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

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...

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Bibliographic Details
Main Authors: Lüpkes, Christof, Schlünzen, K Heinke
Format: Dataset
Language:English
Published: PANGAEA 1996
Subjects:
DATE/TIME
Dew/frost point
Dropsonde
DS
Elapsed time
Event label
HEIGHT above ground
Humidity
relative
with respect to ice
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
potential
Wind direction
Wind velocity
south-north
west-east
Antarc*
Antarctic
Arctic
Berichte zur Polarforschung
Polar Research
Polarforschung
Reports on polar research
Sea ice
Svalbard
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.857807
https://doi.org/10.1594/PANGAEA.857807
Description
Summary: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).

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