Details
| Original language | English |
|---|---|
| Pages (from-to) | 271 - 278 |
| Number of pages | 8 |
| Journal | Meteorologische Zeitschrift |
| Volume | 30 |
| Issue number | 3 |
| Early online date | 26 May 2021 |
| Publication status | Published - 8 Jul 2021 |
Abstract
A viscous sublayer was introduced into a PBL model in order to specify the lower boundary condition for temperature. The simulated results have been compared against available observations. However, for such a comparison, some of the variables and parameters that are necessary are not known but can be deduced from observed data. In this way, surface temperature and thermal diffusivity of the soil, representative for the four-day period studied here, have been estimated from measured data. An optimized relation for the thickness of the viscous sublayer δ was found that includes the diurnal variation of the properties of the air f ow. Including this approach in the model, simulated temperatures in the ground at different levels as well as temperature in the atmosphere agree very well with the observations. The applicability for a wider range of wind speeds was demonstrated by calculating daily maximum temperatures T max. An analysis of long-term observations for the summer season at different operational weather stations consistently show a distinct maximum of T max for a 10-m wind between 2-3 m/s, which can be explained by the interaction between the molecular transport of heat within the viscous sublayer of thickness δ and the turbulent heat fl x.
Keywords
- Boundary layer model, Surface temperature, Viscous sublayer
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Atmospheric Science
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In: Meteorologische Zeitschrift, Vol. 30, No. 3, 08.07.2021, p. 271 - 278.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - On the importance of a viscous surface layer to describe the lower boundary condition for temperature
AU - Groß, Günter
N1 - Funding Information: The publication of this article was funded by the Open Access Fund of Leibniz University Hannover.
PY - 2021/7/8
Y1 - 2021/7/8
N2 - A viscous sublayer was introduced into a PBL model in order to specify the lower boundary condition for temperature. The simulated results have been compared against available observations. However, for such a comparison, some of the variables and parameters that are necessary are not known but can be deduced from observed data. In this way, surface temperature and thermal diffusivity of the soil, representative for the four-day period studied here, have been estimated from measured data. An optimized relation for the thickness of the viscous sublayer δ was found that includes the diurnal variation of the properties of the air f ow. Including this approach in the model, simulated temperatures in the ground at different levels as well as temperature in the atmosphere agree very well with the observations. The applicability for a wider range of wind speeds was demonstrated by calculating daily maximum temperatures T max. An analysis of long-term observations for the summer season at different operational weather stations consistently show a distinct maximum of T max for a 10-m wind between 2-3 m/s, which can be explained by the interaction between the molecular transport of heat within the viscous sublayer of thickness δ and the turbulent heat fl x.
AB - A viscous sublayer was introduced into a PBL model in order to specify the lower boundary condition for temperature. The simulated results have been compared against available observations. However, for such a comparison, some of the variables and parameters that are necessary are not known but can be deduced from observed data. In this way, surface temperature and thermal diffusivity of the soil, representative for the four-day period studied here, have been estimated from measured data. An optimized relation for the thickness of the viscous sublayer δ was found that includes the diurnal variation of the properties of the air f ow. Including this approach in the model, simulated temperatures in the ground at different levels as well as temperature in the atmosphere agree very well with the observations. The applicability for a wider range of wind speeds was demonstrated by calculating daily maximum temperatures T max. An analysis of long-term observations for the summer season at different operational weather stations consistently show a distinct maximum of T max for a 10-m wind between 2-3 m/s, which can be explained by the interaction between the molecular transport of heat within the viscous sublayer of thickness δ and the turbulent heat fl x.
KW - Boundary layer model
KW - Surface temperature
KW - Viscous sublayer
UR - http://www.scopus.com/inward/record.url?scp=85112286581&partnerID=8YFLogxK
U2 - 10.1127/metz/2021/1073
DO - 10.1127/metz/2021/1073
M3 - Article
VL - 30
SP - 271
EP - 278
JO - Meteorologische Zeitschrift
JF - Meteorologische Zeitschrift
SN - 0369-1845
IS - 3
ER -