The variability and trends of monthly maximum wind speed over Iran

Ghaedi, Sohrab

doi:10.28974/idojaras.2019.4.7

Cited by 6 publications

(2 citation statements)

References 20 publications

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“…After that, the main stations at provincial centres have been recording meteorological data since 1950. To apply data in climatological studies, in addition to the statistical period, it is necessary to pay attention to the area of the region, the variety of topography, and the climatic conditions in the proportional distribution of stations in the region under study (Ghaedi, S. 2019). In this study, monthly precipitation data of 113 stations were used for the period 1988-2017 (Figure 1).…”

Section: Datamentioning

confidence: 99%

Anomalies of precipitation and drought in objectively derived climate regions of Iran

Ghaedi

2021

HunGeoBull

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By regionalizing precipitation in 113 synoptic stations in Iran, the characteristics of precipitations and the occurrence of droughts in each region were investigated over a period of 30 years, 1988–2017. Elevation, latitude and distance from moisture source have caused strong East–West and South–North gradients of precipitation across the territory of Iran so that the average annual precipitation increases from 55 mm in the eastern and central regions to 1,730 mm in the south-west coast of the Caspian Sea. Hierarchical cluster analysis identified six precipitation regions in Iran, including the arid, semi-arid, moderate, semi-humid, humid, and high humid regions. An investigation of the standardized precipitation index (SPI) showed that the trend in about 19 per cent of stations was significantly decreasing. It was non-significantly decreasing in 65 per cent, significantly increasing in less than 1 per cent, and non-significantly increasing in 15 per cent of the stations. While the occurrence of drought has increased in most parts of Iran, it has decreased in some stations only in the northern strip of the country. The line slope in more than 84 per cent of the stations represent negative values in SPI, which confirms an increase in the occurrence of droughts in Iran.

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Section: Datamentioning

confidence: 99%

Anomalies of precipitation and drought in objectively derived climate regions of Iran

Ghaedi

2021

HunGeoBull

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“…The elevation of different regions of Iran varies between -28 m (Caspian Sea coasts) to 5670 m (the peak of Mount Damavand). The variation of elevation, the impact of various air mass systems from different directions, and its extension over a wide latitude range have caused diverse climate in this territory (Ghaedi, 2019).…”

Section: Study Area and Datamentioning

confidence: 99%

Spatial and temporal variability of precipitation concentration in Iran

Ghaedi¹,

Shojaian²

2020

Geographica Pannonica

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Precipitation concentration is an important factor to assess climate hazards such as flood and availability of water resources at a regional scale. This paper investigates the spatial and temporal changes of precipitation concentration using the precipitation concentration index (PCI) in 113 stations in Iran for a duration of 30 years (1988-2017). The results show that the mean average of the annual rainfall in Iran varies from 55 mm in the Eastern and central regions (Zabol and Yazd) to 1838 mm in the southwest coast of the Caspian Sea (Bandar Anzali). The highest coefficient of variation (CV) of precipitation is related to the southeastern and southern parts of the country, whereas the lowest CV is observed in the Caspian Sea coast and northwest region. Therefore, its value is mostly a function of latitude. Precipitation concentration and its CV are also influenced by topography and reveal more homogeneity in the northern regions. The Mann-Kendall (MK) test on precipitation concentration data indicates that except for 6 stations (ascending in 2 stations and descending in 4stations), there was no significant trend in others. The stations with non-significant ascending values are located mostly in the Eastern, central and western parts of the country while the non-significant descending ones can be seen in the central and northeastern regions. The results of Sen's slope estimator are also similar to the values of the MK test.

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