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Nocturnal jets in Skåne: an analysis of data from Hyltemossa research tower

Fast, Tove LU (2019) FYSK02 20191
Department of Physics
Combustion Physics
Abstract
A nocturnal jet is a low level air jet that is often seen at an altitude below 500 m during
night time conditions. It can reach wind speeds of storm force and is thus of importance for
aviation and also for transport of e.g. moisture and pollutants in the lower troposphere. By
comparing wind speed measurements at 150 m at Hyltemossa research station (measured by
ICOS Sweden) to the logarithmic wind profile and the power law wind profile for different
times of the day and different time periods, no large deviations that could indicate a
nocturnal jet were found. The temperature profile for the times where the largest deviations
occurred where analysed and showed either that that the temperature inversions reached
higher than 150 m,... (More)
A nocturnal jet is a low level air jet that is often seen at an altitude below 500 m during
night time conditions. It can reach wind speeds of storm force and is thus of importance for
aviation and also for transport of e.g. moisture and pollutants in the lower troposphere. By
comparing wind speed measurements at 150 m at Hyltemossa research station (measured by
ICOS Sweden) to the logarithmic wind profile and the power law wind profile for different
times of the day and different time periods, no large deviations that could indicate a
nocturnal jet were found. The temperature profile for the times where the largest deviations
occurred where analysed and showed either that that the temperature inversions reached
higher than 150 m, or in one case, that the lower most part of the troposphere was unstable.
The analysis of the root mean square errors showed that the logarithmic wind profile
described the lower troposphere better than the power law wind profile. However, both
theories are based on simplifications of a complicated system (Less)
Please use this url to cite or link to this publication:
author
Fast, Tove LU
supervisor
organization
course
FYSK02 20191
year
type
M2 - Bachelor Degree
subject
language
English
id
8985928
date added to LUP
2019-06-20 10:58:18
date last changed
2019-06-20 10:58:18
@misc{8985928,
  abstract     = {{A nocturnal jet is a low level air jet that is often seen at an altitude below 500 m during
night time conditions. It can reach wind speeds of storm force and is thus of importance for
aviation and also for transport of e.g. moisture and pollutants in the lower troposphere. By
comparing wind speed measurements at 150 m at Hyltemossa research station (measured by
ICOS Sweden) to the logarithmic wind profile and the power law wind profile for different
times of the day and different time periods, no large deviations that could indicate a
nocturnal jet were found. The temperature profile for the times where the largest deviations
occurred where analysed and showed either that that the temperature inversions reached
higher than 150 m, or in one case, that the lower most part of the troposphere was unstable.
The analysis of the root mean square errors showed that the logarithmic wind profile
described the lower troposphere better than the power law wind profile. However, both
theories are based on simplifications of a complicated system}},
  author       = {{Fast, Tove}},
  language     = {{eng}},
  note         = {{Student Paper}},
  title        = {{Nocturnal jets in Skåne: an analysis of data from Hyltemossa research tower}},
  year         = {{2019}},
}