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Investigation of Teleconnection between SOI and NAO Signals and Droughts in Zayanderoud Watershed Basin
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Morteza Khodagholi *   , Mahnaz Kavousi , Abbas Ali Arvin , Razieh Sabouhi |
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Abstract: (9817 Views) |
| The long-term monitoring and forecasting of climatological parameters in each zone can be the suitable technique to deal with the effect of climatic fluctuations (drought, flood and etc.) Therefore, it is mportant to identify the effective drought factors in this region such as Zayanderoud watershed basin that it is located in semi arid region. The purpose of this study is to identify the Zayanderoud watershed drought and the effect of Southern Oscillation Index (SOI) and the North Atlantic Oscillation (NAO) on climate conditions and climatical parameters such as precipitation. In this regard, the long-term time series (1970-2009) of synoptic and climatology stations and the data of NAO and SOI was prepared from the site of NOAA. So, to determine the extent and impact of the NAO and SOI on drought, the correlation was calculated between standard precipitation index at the end of May for 3, 5 and 8 months time scales and SOI and NAO indexes. Also, the correlation coefficients are investigated between seasonally and monthly precipitation in this watershed and the mentioned indexes The results show that the precipitation of Meime, Najaf abad, Freydan, Freydoonshahr, Daran, Chadegan, Koohrang has statistically significant negative correlation with SOI. However, Esfahan, Freydan and Freydoonshahr have statistically significant negative correlation with NAO and Shahreza, Abade and Varzane that are located in the dry zone show no statistically significant correlation with any signals and SOI and NAO indexes. The mentioned indexes synchronize and unsynchronize are showed the statistically significant correlation with seasonally and monthly precipitation in different parts of the watershed. |
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| Keywords: Meteorological Signals, Drought, Correlation, Zayandehroud watershed basin and SPI index |
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Full-Text [PDF 250 kb]
(3856 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2014/03/2 | Accepted: 2014/03/2 | Published: 2014/03/2
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