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Investigating climatic changes of the wind regime over Western Iran

OBJECTIVE: The aim of the present study was to reveal changes in the wind regime by investigating wind-speed data from meteorological stations in western Iran and comparing them in the last three decades (1986–2015). RESULTS: Two main groups of daily cycles were identified; one group with a single p...

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Autores principales: Maryanaji, Zohreh, Hamidi, Omid
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7493849/
https://www.ncbi.nlm.nih.gov/pubmed/32933560
http://dx.doi.org/10.1186/s13104-020-05275-z
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author Maryanaji, Zohreh
Hamidi, Omid
author_facet Maryanaji, Zohreh
Hamidi, Omid
author_sort Maryanaji, Zohreh
collection PubMed
description OBJECTIVE: The aim of the present study was to reveal changes in the wind regime by investigating wind-speed data from meteorological stations in western Iran and comparing them in the last three decades (1986–2015). RESULTS: Two main groups of daily cycles were identified; one group with a single peak and one group with two or more peaks. Using spectral decomposition technique, it was revealed that the heterogeneity observed in the area in terms of altitude and topography results in differences in the density of the spectra with similar frequencies. Two main daily cycles were also identified for each station. Although there were low frequencies, the intensity of the waves at the examined stations was the consequence of the interaction between the frequency, period, and distribution space. By evaluating harmonics in the area, it was revealed that the variance of the first harmonic is maximized in the south and southwest, while the variance of the second harmonic is maximized in the north and northwest. The positive value ​​of the trend in the first harmonic indicated that the trend of the variance for the first harmonic has increased in the central and eastern parts and has decreased in the northern and western parts.
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spelling pubmed-74938492020-09-23 Investigating climatic changes of the wind regime over Western Iran Maryanaji, Zohreh Hamidi, Omid BMC Res Notes Research Note OBJECTIVE: The aim of the present study was to reveal changes in the wind regime by investigating wind-speed data from meteorological stations in western Iran and comparing them in the last three decades (1986–2015). RESULTS: Two main groups of daily cycles were identified; one group with a single peak and one group with two or more peaks. Using spectral decomposition technique, it was revealed that the heterogeneity observed in the area in terms of altitude and topography results in differences in the density of the spectra with similar frequencies. Two main daily cycles were also identified for each station. Although there were low frequencies, the intensity of the waves at the examined stations was the consequence of the interaction between the frequency, period, and distribution space. By evaluating harmonics in the area, it was revealed that the variance of the first harmonic is maximized in the south and southwest, while the variance of the second harmonic is maximized in the north and northwest. The positive value ​​of the trend in the first harmonic indicated that the trend of the variance for the first harmonic has increased in the central and eastern parts and has decreased in the northern and western parts. BioMed Central 2020-09-15 /pmc/articles/PMC7493849/ /pubmed/32933560 http://dx.doi.org/10.1186/s13104-020-05275-z Text en © The Author(s) 2020 Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.
spellingShingle Research Note
Maryanaji, Zohreh
Hamidi, Omid
Investigating climatic changes of the wind regime over Western Iran
title Investigating climatic changes of the wind regime over Western Iran
title_full Investigating climatic changes of the wind regime over Western Iran
title_fullStr Investigating climatic changes of the wind regime over Western Iran
title_full_unstemmed Investigating climatic changes of the wind regime over Western Iran
title_short Investigating climatic changes of the wind regime over Western Iran
title_sort investigating climatic changes of the wind regime over western iran
topic Research Note
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7493849/
https://www.ncbi.nlm.nih.gov/pubmed/32933560
http://dx.doi.org/10.1186/s13104-020-05275-z
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