چكيده لاتين :
In this paper, the homogeneity of the annual wind speeds average time series was investigated and
categorized using the standard normal homogeneity test and cumulative deviation test in thirty-one Iranian
weather stations during the period of 1981-2015. The results of the cumulative deviation test on the annual
average wind speed time series confirmed the homogeneity only for the Ahvaz, Ardebil, Qazvin, and Isfahan
stations. The stations were categorized to the following groups, using different statistical methods:
1- There were weak heterogeneities in the wind speed records for Ilam, Bushehr, Arak, Karaj, Tehran, Shiraz,
Kerman, Birjand, and Bojnoord stations.
2-There were moderate heterogeneities in the wind speed records for Sanandaj, Kermanshah, Zanjan,
Yasouj, Qom, Mashhad, Zahedan, and Bandar Abbas stations.
3- There were high heterogeneities in the wind speed records for Urmia, Tabriz, Tehran, Hamedan, Branch,
Rasht, Sari, Yazd, Gorgan and KhoramAbad stations.
The results of the SNHT test on the annual average wind speed time series indicated that wind speed has
decreased in Bojnoord and Shiraz stations by a moderate amount. In addition, the annual average wind
speed time series of the Urmia, Khorramabad Bushehr, Semnan, Gorgan, and Birjand stations experienced a
significant jump that shows the increasing trend of wind speed in the mentioned stations.
Moreover, some jumps in data values with moderate intensities were observed in Sanandaj, Zanjan, Qom,
Kermanshah, Tabriz, Hamadan, Yasouj, Mashhad, Rasht, Karaj, Sari, Yazd, Kerman, and Bandar Abbas Stations.
The investigations showed that in Tabriz, Mashhad, Khorramabad, Gorgan, Tehran, and Urmia stations with
observed moderate and high heterogeneities, the starting time of heterogeneity and their jumps are similar.
At these stations, the starting year of the detected jump did not correspond to the year of their relocations;
therefore, the wind speed jump couldn’t be explained by the relocation of the station. It appears that the
sudden increase in wind speed was created by altering the wind measurement instruments or changing the
unit of wind speed which are not recorded in the metadata of these stations. It is likely that the heterogeneity
and the trend of the annual average wind speed time series of the weather stations were the
