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@article{1396185,
author = {Brázdil, Rudolf and Valík, Adam and Zahradníček, Pavel and Řezníčková, Ladislava and Tolasz, Radim and Možný, Martin},
article_location = {OLDENDORF LUHE},
article_number = {2},
doi = {http://dx.doi.org/10.3354/cr01492},
keywords = {universal anemograph; Vaisala wind-speed sensors; wind speed; homogenisation; wind stilling; Czech Republic},
language = {eng},
issn = {0936-577X},
journal = {Climate Research},
note = {Rok uplatnění 2018, přenášet do RIV až v roce 2019!},
title = {Wind-stilling in the light of wind speed measurements: the Czech experience},
url = {http://dx.doi.org/10.3354/cr01492},
volume = {74},
year = {2018}
}
TY - JOUR
ID - 1396185
AU - Brázdil, Rudolf - Valík, Adam - Zahradníček, Pavel - Řezníčková, Ladislava - Tolasz, Radim - Možný, Martin
PY - 2018
TI - Wind-stilling in the light of wind speed measurements: the Czech experience
JF - Climate Research
VL - 74
IS - 2
SP - 131-143
EP - 131-143
PB - INTER-RESEARCH
SN - 0936577X
N1 - Rok uplatnění 2018, přenášet do RIV až v roce 2019!
KW - universal anemograph
KW - Vaisala wind-speed sensors
KW - wind speed
KW - homogenisation
KW - wind stilling
KW - Czech Republic
UR - http://dx.doi.org/10.3354/cr01492
N2 - Changes of instruments often give rise to significant break-points in wind-speed series. This is particularly applicable to when measurements are automated, a process that started in the Czech Republic in the mid-1990s, when standard universal anemographs were progressively replaced by Vaisala WAA251 sensor (cup anemometer) and the WS425 sensor (ultrasonic). Parallel wind speed measurements, by universal anemographs and Vaisala sensors, at the Doksany (2000–2016) and Kocelovice (2000–2016) stations enabled differences in the two types of measurement to be analysed. Vaisala sensors measure, on average, higher wind-speeds than universal anemographs, particularly in calm situations and at low wind speeds. The differences between the two types of instrument do not depend on wind direction. Linear trends of homogenised daily mean wind-speed series from only a universal anemograph or combined from universal anemograph and Vaisala sensors generally exhibit no important differences in their significance or values. This could indicate that observed decreasing trends in mean daily wind-speeds (“stilling”) cannot be attributed to changes of wind-speed measurements to automated devices; with respect to only two stations being investigated, this is biased by high uncertainty. On the other hand, important differences in the two types of measurement, both in linear trends and their significance, appear for series of three daily readings (0700, 1400 and 2100 LMT).
ER -
BRÁZDIL, Rudolf, Adam VALÍK, Pavel ZAHRADNÍČEK, Ladislava ŘEZNÍČKOVÁ, Radim TOLASZ and Martin MOŽNÝ. Wind-stilling in the light of wind speed measurements: the Czech experience. \textit{Climate Research}. OLDENDORF LUHE: INTER-RESEARCH, 2018, vol.~74, No~2, p.~131-143. ISSN~0936-577X. Available from: https://dx.doi.org/10.3354/cr01492.
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