Initial assessment of the Weather Research and Forecasting model for forecasting bioclimatic conditions during breeze circulation – case study of the Słowiński National Park
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Date
2013
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Wydział Nauk Geograficznych i Geologicznych Uniwersytetu im. Adama Mickiewicza
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Abstract
Land-sea interaction at the Polish Baltic Coast impacts the specific local climate conditions. Thermally driven
circulation, observed mainly in the summer season, causes the advection of the cool sea air over land and influences
the local atmospheric environment, including bioclimatic conditions. The aim of this paper is to present the evaluation
of the WRF model for forecasting sensitive bioclimatic conditions on a selected day with sea breeze in the vicinity of
the Łeba Sandbar (the Słowiński National Park). The results obtained from a numerical weather prediction model were
post-processed to calculate the daily variability of two biothermal indices: the Effective Temperature (ET) and the Dry
Cooling Power (H). To evaluate the thermal comfort of a person wearing typical clothes, the Michajlow’s, Petrovič and
Kacvińsky’s scales were adopted. A detailed analysis performed for 31st July 2010 shows in most cases a satisfactory
level of agreement between the simulated data and the in-situ measurements for nested domains with horizontal grid
resolution less than 2 km. However, the simulation results tend to underestimate the thermal comfort, especially in the
middle part of the Łeba Sandbar due to terrain data misrepresentations, which results in the overestimation of wind
speed.
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Keywords
breeze circulation, sea breeze index, WRF, Słowiński National Park, bioclimatic conditions
Citation
Quaestiones Geographicae vol. 32 (3), 2013, pp. 5-14
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ISBN
ISSN
0137-477X