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

Identifikátory výsledku

  • Kód výsledku v 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>

  • Výsledek na webu

    <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>

Alternativní jazyky

  • Jazyk výsledku

    angličtina

  • Název v původním jazyce

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

  • Popis výsledku v původním jazyce

    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).

  • Název v anglickém jazyce

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

  • Popis výsledku anglicky

    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).

Klasifikace

  • Druh

    J<sub>imp</sub> - Článek v periodiku v databázi Web of Science

  • CEP obor

  • OECD FORD obor

    10510 - Climatic research

Návaznosti výsledku

  • Projekt

    <a href="/cs/project/GA15-11805S" target="_blank" >GA15-11805S: Vichřice v českých zemích za posledních 500 let</a><br>

  • Návaznosti

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

Ostatní

  • Rok uplatnění

    2017

  • Kód důvěrnosti údajů

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

Údaje specifické pro druh výsledku

  • Název periodika

    Climate Research

  • ISSN

    1616-1572

  • e-ISSN

  • Svazek periodika

    74

  • Číslo periodika v rámci svazku

    2

  • Stát vydavatele periodika

    DE - Spolková republika Německo

  • Počet stran výsledku

    13

  • Strana od-do

    131-143

  • Kód UT WoS článku

    000418809900004

  • EID výsledku v databázi Scopus

    2-s2.0-85040571877