تحقیقات کاربردی علوم جغرافیایی

تحقیقات کاربردی علوم جغرافیایی

مطالعه جریان‌های مدل گردش اتمسفری بزرگ مقیاس بر روزهای بارش شدید دشت اردبیل

نویسندگان
1 دانشجوی دکتری اقلیم شناسی دانشگاه محقق اردبیلی، اردبیل، ایران.
2 استاد اقلیم شناسی دانشگاه محقق اردبیلی، اردبیل، ایران.
3 دانشکده برنامه ریزی و علوم محیطی دانشگاه تبریز، تبریز، ایران.
4 استاد اقلیم شناسی دانشگاه تهران
چکیده
سیستم گردش اتمسفری برای تعیین سطح آب و هوا و محیط زیست و تأثیر آب و هوای منطقه و ویژگی های آن اهمیت دارد .در این مقاله، برای مطالعه تاثیرآن، سیستم طبقه بندی، توسعه یافته توسط Lamb ، برای به دست آوردن اطلاعات گردش جوی روزهای بارش شدید استان اردبیل در مقیاس روزانه اعمال می شود. به این منظور، داده های فشار تراز دریا در مقیاس روزانه روزهای بارش شدید از سال 1971-2007 برای بدست آوردن شاخص سیستم لمب با 27 کلاس به کار گرفته شده است. فراوانی شاخص لمب برای دوره های مختلف محاسبه و توصیف شده است، پنج کلاس از شاخص های لمب دارای فراوانی بیشتری بودند: : E, SE,A , C, CSE ، این شاخص ها ابزاری برای توصیف رابطه بارش با سیستم گردش اتمسفری در اردبیل است. بارش شدید بیشتر با خانواده سیکلونی، کم فشاری ار طرف عرضهای شمالی و کم فشار گنگ و پاکستان ارتباط دارند. شاخص SE متداول ترین شاخص سیستم گردش اتمسفری لمب می­باشد. فصول سرد و خنک که از آگوست و مارچ آغاز می­شود با کلاس­های E, SE, A, C ، CSEمرتبط هستند، این کلاس­ها کمترین نقش را در فصول گرم دارند. SE, NE متدوال ترین کلاس سیستم گردش جوی در تابستان بویژه در ماه جولای می باشند.
کلیدواژه‌ها

عنوان مقاله English

Study of the models of large-scale atmospheric circulation system model on intesify rainfall in Ardebil plain

نویسندگان English

sahar Nasiri 1
Boroumand Salahi 2
aliakbar rasouli 3
faramarz khoshakhlagh 4
1 PhD student at the University of mohaghegh Ardabili University, Ardebil, Iran.
2 PhD student at the University of mohaghegh Ardabili University, Ardebil, Iran.
3 Faculty of Planning and Environmental Sciences, Tabriz University, Tabriz, Iran.
4 Associate Professor of Climatology, Tehran University, Tehran, Iran
چکیده English

Atmospheric circulation is important to determine the surface climate and environment, and affect regional climate and surface features. In this study, to quantify its effect, the classification system, developed by Lamb is applied to obtain circulation information for Ardabil, North West Province in Iran, on a daily basis, and is a method to classify synoptic weather for study area. For that purpose, daily mean sea-level pressure (MSLP) for extreme precipitation days from 1971 to 2007 is used to derive six circulation indices and to provide a circulation catalogue with 27 circulation types. The frequency of circulation types over different periods is computed and described. Five circulation types are most recognised in this study: E, SE, A, C and CSE. The catalogue and the associated indices provide a tool to interpret the regional climate and precipitation, and deal with the linkage between the mean extreme regional precipitations in north western of Iran and the large-scale circulation. Five circulation types E, A, SE, C and CSE are associated with high precipitation and rainy seasons (spring and September) but the most precipitation rate is resulted of cyclone family. Low pressure of north latitudes and central area of Iran with low pressure of gang from Pakistan and India. SE is almost dominant circulation type over the years. The cold season started from august to march is characterized by frequent directional flows, especially E, SE, A, C and CSE whereas in warm period (Apr–Aug) SE, NE, AE have smaller role, especially in July, August and September more frequent flows dominated by SE and E.

کلیدواژه‌ها English

Keywords: Atmospheric circulation type
Extreme precipitation
Lamb weather
Ardabil
Belleflamme A, Fettweis X, Erpicum M .(2015). Do global warming- induced circulation pattern changes affect temperature and precipitation over Europe during summer? International Journal of Climatology. 23.
Briffa KR. (1995). The simulation of weather types in GCMs: A regional approach to control-run validation. In Analysis of Climate Variability, von Storch H, Navarra A (eds). Springer: Berlin. 12.
Chen D, Hellstro¨m C. (1999). The influence of the North Atlantic Oscillation on the regional temperature variability in Sweden: spatial and temporal variations. Tellus .51.
Danesvar Vosughi, Din paxhoh .(2012). Investigating the process of underground water quality changes in Ardebil plain using Spearman method, journal of Mohit shenasi, 4.
Goodess CM, Palutikof JP. (1998). Development of daily rainfall scenarios for southeast Spain using a circulation-type approach to downscaling.
Hess P, Brezovsky H. (1977). Katalog der Grosswetterlagen Europas (1881–1976) Berichte des Deutschen Wetterdienstes. 11.
Hewitson BC, Crane RG .(2002). Self-organizing maps: applications to synoptic climatology. Clim Res .22.
Hurrell JW, van Loon H. (1997). Decadal variations in climate associated with the North Atlantic Oscillation. Climatic Change .36.
International Journal of Climatology 18.
JaliliSh, Ingo Kirchner, David M. Livingstonec, SaeidMorida, (2012), the influence of large-scale atmospheric circulation weather types on variations in the water level of Lake Urmia, Iran, international journal of climatology.24.
Jenkinson AF, Collison FP. (1977). An initial climatology of gales over the North Sea. Synoptic Climatology Branch Memorandum, Meteorological Office, Bracknell.62.
Jones PD, Kelly PM. (1982). Principal component analysis of the Lamb catalogue of daily weather types: Part 1, Annual frequencies. International Journal of Climatology. 2.
Jones PD. (1983). The early twentieth century Arctic High—fact or fiction? Climate Dynamics .63.
Lamb HH. (1950). Types and spells of weather around the year in the British Isles. Quarterly Journal of the Royal Meteorological Society 76.
Lamb HH. (1972). British Isles weather types and a register of daily sequence of circulation patterns, 1861–1971. Geophysical Memoirs Meteorological Office: London, UK. 85.
Liu1 Wenbin Lei Wang Deliang Chen Kai Tu Chengqing Ruan Zengyun Hu, (2015), large-scale circulation classification and its links to observed precipitation in the eastern and central Tibetan Plateau. Clim Dyn,.10.
Osborn TJ, Briffa KR, Tett SFB, Jones PD, Trigo RM. (1999). Evaluation of the North Atlantic Oscillation as simulated by a coupled climate model. Climate Dynamics 15.
Pope1 R J, E W Butt, M P Chipperfield, R M Doherty, S Fenech, A Schmidt, S R Arnold and N H Savage. (2016). the impact of synoptic weather on UK surface ozone and implications for premature mortality, Environmental Research Letters, Environ. Res. Lett. 11.
Salahi B, Mahdi Alijahan. (2015). Extracting and analyzing synoptic patterns led to thunderstorm rainfall in Ardebil plain, journal of physical geography in Tehran, N 3.
Trigo RM, DaCamara, CC. (2000). Circulation Weather Types and their influence on the precipitation regime in Portugal. International Journal of Climatology. 20.
Tveito OE. (2010). an assessment of circulation type classifications for precipitation distribution in Norway. PhysChem Earth. 35.