Synoptic analysis of sea level pressure patterns and Vertically Integrated Moisture Flux Convergence VIMFC during the occurrence of durable and pervasive rainfall in Iran |
| |
| Institution: | 1. Department of Climatology, Faculty of Natural Resources, University of Kurdistan, Sanandaj, Iran;2. Department of Natural Geography, Faculty of Geographical Sciences, Kharazmi University, Tehran, Iran;1. School of Geosciences, The University of Edinburgh, EH9 3FF, Edinburgh, United Kingdom;2. School of Energy, Geoscience, Infrastructure and Society, Heriot-Watt University, EH14 4AS, Edinburgh, United Kingdom;3. Ministry of Energy and Water Development, P.O. Box 53930, Lusaka, Zambia;1. Kermanshah Regional Meteorological Office, Kermanshah, Iran;2. Kharazmi University, Tehran, Iran;3. Department of Physical Geography, Mohaghegh Ardabili University, Ardabil, Iran;4. Kermanshah Regional Meteorological Office, Kermanshah, Iran;5. Kharazmi University, Tehran, Iran;1. School of Geographical Sciences, Nanjing University of Information Science and Technology, Nanjing, 210044, China;2. Sudan Meteorological Authority (SMA), Khartoum, P.O.Box 574, Sudan;3. Department of Hydraulics and Hydrology, School of Civil Engineering, Faculty of Engineering, Universiti Teknologi Malaysia (UTM), 81310, Skudai, Johor, Malaysia;4. Department of Geography, University of Burundi, P.O. Box 5142, Bujumbura, Burundi;5. Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing, 210044, China;6. School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing, 210044, China;7. National Meteorological Agency of Ethiopia, P.O. Box 1090, Addis Ababa, Ethiopia;8. Research Institute for History of Science & Technology, Nanjing University of Information Science & Technology, Nanjing, 210044, China;9. School of Remote Sensing and Geomatics Engineering, Nanjing University of Information Science and Technology, Nanjing, 210044, China;1. Department of Climate Change and Meteorological Services (DCCMS)Malawi, P.O. Box 1808, Blantyre, Malawi;2. Yale-NUIST Center on Atmospheric Environment, International Joint Laboratory on Climate and Environment Change (ILCEC), Nanjing University of Information Science & Technology, Nanjing, 210044, China;3. School of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing, 210044, China |
| |
| Abstract: | To carry out this research, interpolated data of daily rainfall from Iran’s Asfazari data base during 1/1/1979–31/12/2013 is used. The day along with pervasive rainfall considered a day that at least 50% of Iran’s territory has received more than 1 mm for at least two consecutive days. Based on mentioned thresholds, 224 days selected for statistical analysis. The sea level pressure data, zonal and meridional wind components and specific humidity with spatial resolution of 0.25*0.25 Gaussian degree in spatial domain of 10 °N to 60 °N and 15 °E to 75 °E obtained from the European Center for Medium range Weather Forecasting (ECMWF) ERA-Interim for selected days. Then on the data matrix of sea level pressure, the cluster analysis by Ward linkage method done and 4 sea level pressure patterns with different configuration of synoptic systems were identified. The findings showed that in the sea level, the interaction between southern thermal low pressure systems (Arabia low pressure) with Europe and Siberia cold immigrant high pressure both by individual and integration and anticyclone circulation of Arab sea from the low level of 1000–500 hPa of troposphere have the most role on occurrence of durable and pervasive rainfall of Iran. The most Vertically Integrated Moisture Flux Convergence in the first layer of troposphere (1000–850 hPa) observed in low height regions, in the second layer of troposphere (775–700 hPa) on Zagros Mountains and in third layer of troposphere (600–500 hPa) is seen in mountains leeward of Iran. Also the results showed that the maximum rainfall cores has the most coordination with Vertically Integrated Moisture Flux Convergence (VIMFC) in the second layer of troposphere (775–700 hPa) on the Zagros heights in the southwest of Iran. |
| |
| Keywords: | Rainfall Durability and pervasiveness Arabian Sea anticyclone Iran |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
