Wind-stilling in the light of wind speed measurements: the Czech experience

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00020699%3A_____%2F17%3AN0000165" target="_blank" >RIV/00020699:_____/17:N0000165 - isvavai.cz</a>

Result on the web

<a href="https://www.int-res.com/abstracts/cr/v74/n2/p131-143/" target="_blank" >https://www.int-res.com/abstracts/cr/v74/n2/p131-143/</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3354/cr01492" target="_blank" >10.3354/cr01492</a>

Result language

angličtina

Original language name

Wind-stilling in the light of wind speed measurements: the Czech experience

Original language description

Changes of instruments often give rise to significant break-points in wind-speed series. This is particularly applicable when measurements are automated, a process that started in the Czech Republic in the mid-1990s, when standard universal anemographs were progressively replaced by the 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 2 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 2 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 2 stations being investigated, this is biased by high uncertainty. In contrast, important differences in the 2 types of measurement, both in linear trends and their significance, appear for series of 3 daily readings (07:00, 14:00 and 21:00 h LMT).

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10510 - Climatic research

Project

<a href="/en/project/GA15-11805S" target="_blank" >GA15-11805S: Windstorms in the Czech Lands during the past 500 years</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Climate Research

ISSN

1616-1572

e-ISSN

—

Volume of the periodical

74

Issue of the periodical within the volume

2

Country of publishing house

DE - GERMANY

Number of pages

13

Pages from-to

131-143

UT code for WoS article

000418809900004

EID of the result in the Scopus database

2-s2.0-85040571877