Zahra Hejazizadeh

Kharazmi University | KHU · Department of geography and climatology

Introduction Global warming threatens human survival in today's scenario; and has become an environmental challenge. The climate data shows the warming trend in many parts of the world, which has led to a wide range of climate effects such as reduced precipitation, drought, and the occurrence of extreme events. The increasing vulnerability of many...

Evidence suggests that climate change will create uncertain regional agricultural production stability in the coming decades. This research investigated the impact of climate change on hydrology and sugar beet yield as one of the main crops in the Urmia lake basin using the Soil and Water Assessment Tool (SWAT). To address this, a baseline SWAT mod...

زمینه و هدف امروزه ایران به دلیل ویژگی‌های جغرافیایی و اقلیمی، یکی از آسیب‌پذیرترین کشورها در برابر تغییرات اقلیمی است. یکی از مهم‌ترین تأثیرات منفی تغییر اقلیم افزایش دما بوده که می‌تواند از‌این‌پس موجب افزایش خطر آتش‌سوزی جنگلی شود. پدیده آتش‌سوزی جنگلی به‌عنوان یک چالش زیست‌محیطی و یکی از مخاطراتی است که بخش وسیعی از جنگل‌های جهان را تهدید می‌کن...

زمینه و هدف: امروزه ایران به دلیل ویژگی‌های جغرافیایی و اقلیمی، یکی از آسیب‌پذیرترین کشورها در برابر تغییرات اقلیمی است. یکی از مهم‌ترین تأثیرات منفی تغییر اقلیم افزایش دما بوده که می‌تواند از این پس موجب افزایش خطر آتش‌سوزی جنگلی شود. پدیده آتش‌سوزی جنگلی به‌عنوان یک چالش زیست محیطی و یکی از مخاطراتی است که بخش وسیعی از جنگل‌های جهان را تهدید می‌ک...

In this study, Drought and wetness periods in Iran under the influences of sea surface temperature (SST) anomalies and large scale atmospheric circulation, were studied using the SPI from 1979 to 2020. To illustrate changes in atmospheric circulation patterns, sinuosity, humidity, jet stream and u, v were analyzed. Severe droughts in autumn (OND) a...

Land surface albedo (LSA) and land surface temperature (LST) are used in many environmental studies. Linking topographical factors (altitude, aspect, and slope) with LST and LSA plays an essential role in climate modeling, environmental changes, hydrology, energy balance, architecture, etc. Knowing the relationship between them is of particular imp...

The Madden-Julian Oscillation is one of the large-scale climate change patterns in the maritime tropics, with sub-seasonal time periods of 30 to 60 days affecting tropical and subtropical regions. This phenomenon can cause changes in various quantities of the atmosphere and ocean, such as pressure, sea surface temperature, and the rate of evaporati...

بررسی رفتار متغیرهای اقلیمی در طول محدوده زمانی، نشان این واقعیت است که اقلیم با تغییراتی مواجه بوده است، که با توسعه شهری و نقش انسان در این تغییرات به واسطه انتشارگازهای گلخانه‌ای بارزتر می‌شود. هدف این پژوهش بررسی اثرات تغییر اقلیم بر افزایش ریسک مخاطره خشک‌سالی در تهران با بهره‌گیری از سناریوهای CMIP6 بوده است. ابتدا داده‌های بارش و دما روزانه...

Studying changes in precipitation extremes are important due to the possible increase in heavy rainfall, drought, and the occurrence of summer storms. Therefore, in this study, the trend of variations in precipitation extremes in the Middle East and North Africa (MENA) in the historical period (1985-2014) and the future period (2021-2050) was inves...

The current research aims at studying the spatio-temporal distribution of blocking events in the Northern and Southern Hemispheres from 1968 to 2018, for a period of 51 years based on the Wiedenmann block intensity (BI) index. The results showed that blocking events in the Northern Hemisphere are almost twice as often as in the Southern Hemisphere....

The current research aims at studying the spatio-temporal distribution of blocking events in the Northern and Southern Hemispheres from 1968 to 2018, for a period of 51 years based on the Wiedenmann block intensity (BI) index. The results showed that blocking events in the Northern Hemisphere are almost twice as often as in the Southern Hemisphere....

The recent droughts in Iran have contributed to declining runoff, diminishing lake water levels, and rising salt levels due to lower runoff. This study aims to quantify how the recent changes affected to investigate the trend of land surface albedo in Iran between 2000 and 2018. Accessing field data from the Iran is difficult, and thus the common u...

1. Introduction The phenomenon of climate change and global warming is one of the biggest challenges of the present age, which has affected the hydrological cycle on a global and regional scale. The purpose of this study is to investigate the effects of climate change on torrential rains And Temprature, Rainfall, Run off in Tehran province. In this...

Introduction The phenomenon of climate change and global warming is one of the biggest challenges of the present age, which has affected the hydrological cycle on a global and regional scale. The purpose of this study is to investigate the effects of climate change on torrential rains And Temprature, Rainfall, Run off in Tehran province. In this st...

پدیدۀ تغییر اقلیم و گرمایش جهانی یکی از بزرگ‌ترین چالش‌های عصر حاضر است که چرخۀ هیدرولوژیکی در مقیاس جهانی و منطقه‌ای را تحت تأثیر قرار داده است. هدف این پژوهش بررسی اثرات تغییر اقلیم بر بارش‌‌های سیل‌آسا در استان تهران است. این پژوهش به دو بحث مطالعاتی (هواشناسی، هیدرولوژیکی) پرداخته است. در همین راستا، ابتدا پارامترهای (دما و بارش) سه ایستگاه سین...

One of the most important energy sources in the world is solar energy, which is a renewable resource and does not cause any damage to the environment. Which all of these features justify using it as a clean energy source and economically viable cost.. Due to the relatively large area of the Iran in low latitudes and relatively dry climatic conditio...

This study analyzed the impact of spatial variation in westerlies on widespread and heavy precipitation over Iran using the sinuosity index. Four groups of datasets were used for the period from 1979 to 2020, containing the gridded geopotential height, specific humidity, precipitation data, and the Arctic Oscillation (AO) and North Atlantic Oscilla...

The results showed that the rainfall persistence in Iran had four patterns. The first pattern was due to the establishment of Rex blocking and moisture convergence in the southern Mediterranean. The second pattern of persistence of days was due to the establishment of a split blocking pattern and the existence of a semi-deep trough in the eastern M...

امروزه تغییراقلیم و گرمایش زمین چالشی جهانی و تهدیدی جدی برای محیط زیست کره ی زمین به شمار می رود که با رشد و تو سعه شهرها هم این پدیده نمود بیشتری پیدا کرده است که توانسته است تغییراتی در افزایش دما و منابع آبی هم داشته باشد. هدف از این مطالعه اثرات روند دما و بارش در بازه زمانی (۲۰۲۰-۱۹۸۸) تا (۲۰۲۱-۲۰۸۳)، ایستگاه سینوپتیک مهرآباد در استان تهران م...

Introduction One of these gathering patterns, which is likely to work on Iran's climate, are blocking systems. This phenomenon occurs when the Western flows that are moving in natural state from the west to the east changed its main route to the north or the south, and the climate of the areas that should pass through them. doing. Of course, for ar...

The aim of this study is to investigate the spatiotemporal variations of albedo in Iran. To this aim, the daily albedo datasets of Moderate Resolution Imaging Spectroradiometer (MODIS) from onboard Aqua and Terra (MCD43A3v006) were applied for the period of 2000 to 2019 with a spatial resolution of 500 × 500 m 2. First, the long-term average of Ira...

Land Surface temperature is an appropriate manifestation of energy balance in the surface and greenhouse effect; because key parameterization in the physics of land surface processes is on a regional and especially global scale. It has been almost two decades since the MODIS sensor measured the surface temperature. Analysis of Land surface temperat...

• The Sudanese low pressure systems is one of the thermal low pressures that are formed around the Red Sea and their low-pressure lines cover the south of the Red Sea, Sudan, and Ethiopia and continue their route through the southwest of Iran and cause heavy rainfall. The common feature of all these rain systems is land surface low pressures or low...

The goal of the study is to analyze the trend and extent of Sudan low pressure with respect to climate change and its relation to the upper atmosphere levels and the influences of the variation on precipitation in October, November, December, January, February, and March during the period from 1951 to 2018. This period was divided into seven 10-yea...

The present study aimed to investigate and identify blocking systems in Eurasia and Atlas, during the period 1973-2018 using the Weidemann Numerical Index (BI) and an altitude of 500. The results showed that the center of more than 65% of the blockages that have affected the Eurasian atmosphere are located in the North Atlantic region between the s...

Increasing greenhouse gases could increase the frequency of changes in precipitation in different regions of the world. So, identify the effects of global warming on precipitation in a country like Iran which is located in the dry area of the earth is of great importance in planning related to water resources are. According to the study, statistica...

Introduction Due to the lack of correlation between flow patterns and climatic phenomena, it is possible to attribute phenomena such as droughts and droughts to changes in circulation patterns. For this purpose, it is possible to analyze the role of flow patterns in creating and controlling dry and wet periods using the profiles based on rainfall v...

In order to develop tourism industry in a region, studying its climate through the year is necessary. The climate of the destination is of great importance for tourists. Therefore, the application of climate indices can help the tourism planning in the area and optimum spent of time. In this study, climatic conditions of a vast area in Iran includi...

The purpose of this study is to identify and detect changes in rainfall extremes as indicators of climate change in the region of Iran. To conduct this research daily rainfall data of 76 synoptic stations were used from 1986 to 2016. The results show that the trend of the number of days with heavy rainfall was about 7 percent of Iran's negative and...

Modeling the impact of climate change on the crop yields and watershed hydrology is necessary for regions like the Urmia lake basin (ULB), which are more sensitive to environmental changes, because of their ecologic structures for the planning of water resources, cropping sustainability, and adaptation of correct policies. We built an agro-hydrolog...

Modeling the impact of climate change on the crop yields and watershed hydrology is necessary for regions like the Urmia lake basin (ULB), which are more sensitive to environmental changes, because of their ecologic structures for the planning of water resources, cropping sustainability, and adaptation of correct policies. We built an agro-hydrolog...

Semi-distributive hydrological models such as SWAT have become increasingly popular in water resource management within the watersheds. Obtaining representative meteorological data is the main challenges of these models to maximize their ability and stability, which can be difficult and time-consuming. Due to the lack of climate data such as rainfa...

Semi-distributive hydrological models such as SWAT have become increasingly popular in water resource management within the watersheds. Obtaining representative meteorological data is the main challenges of these models to maximize their ability and stability, which can be difficult and time-consuming. Due to the lack of climate data such as rainfa...

This research was conducted to identify the dust storms in the Midwest of Iran from June 16 to 19, 2015. To investigate the synoptic conditions of the causes of this phenomenon, the ECMWF has an array of 0.125 degrees, including geopotential, omega, and sea level pressure, orbital and meridian components of the wind, specific humidity Soil moisture...

Predicting the changes in temperature and rainfall patterns is essential for water resource planning, sustainability of agricultural products, and adapting to appropriate policies in basin areas. This obstacle is critical in semi-arid areas like the Urmia Lake Basin, which is experiencing a severe reduction in runoff due to increased water use and...

Predicting the changes in temperature and rainfall patterns is essential for water resource planning, sustainability of agricultural products, and adapting to appropriate policies in basin areas. This obstacle is critical in semi-arid areas like the Urmia Lake Basin, which is experiencing a severe reduction in runoff due to increased water use and...

Predicting the changes in temperature and rainfall patterns is essential for water resource planning, sustainability of agricultural products, and adapting to appropriate policies in basin areas. This obstacle is critical in semi-arid areas like the Urmia Lake Basin, which is experiencing a severe reduction in runoff due to increased water use and...

An accurate analysis and modeling of the temperature time series are one of the important challenges in predicting climate behavior and the impact on future environmental and socioeconomic conditions. time-series are complex and non-stationary. In this research, we tried to evaluate and analyze the average long-term oscillation (temperature variabi...

An accurate analysis and modeling of temperature time series is one of the important challenges in predicting climate behavior and the impact on future environmental and socioeconomic conditions. time series are complex and non-stationary. In this research, we tried to evaluate and analyze the average long-term oscillation (temperature variability)...

This study was carried out to investigate the impacts of Karoun water branches transference projects on creation or intensification of Khuzestan dust points. For this purpose, daily climatic parameters (temperature, precipitation, horizontal view, moist and wind) and required water debit for 9 synoptic and hydrometric stations within a 30-year stat...

The word "climate studies and indicates the impact of climatic factors on living creature's activities. By determining regions climate comfort, planning for tourism and even peoples comfort situation will be easily possible, in this research, indexes mentioned in thermal Beylan equation were used which are called analytical indexes Human comfort or...

Abstract: Climatic design a suitable method to create location a variety of structures and immunization. Human comfort conditions combined with the reduction in overall energy cost and it is important in all kinds of weather. The aim of this study is optimized for building deployment in Kashan city. The city most days of the year is hot and dry an...

The purpose of this study was to investigate the effects of the North Atlantic Oscillation on the middle levels of Atmosphere and precipitation changes in the West of country. To do this, first monthly rainfall data of 17 synoptic stations of the West country in period of 30 years from 1984 to 2014 of country were collected from Meteorological Orga...

In this study, first pollutants concentration data was obtained. After that for atmospheric right scrolling with using RAOB software and high level atmospheric data of Mehrabad station draw the thermodynamic chart (SKEW-T).In order to analyzing the atmospheric circulations with using European among scale center data base (ECMWF), the related maps d...

The aim of this study is modeling spatiotemporal variations of albedo. This study was conducted using simultaneous effects of several components, such as wetness of surface layer of soil, cloudiness, topography and vegetation density (NDVI), using MEERA2 model with a resolution of 50 in 50 km during 2000-2010 in Iran. The results of spatial analysi...

Determining bioclimatic situation of each month of the year regarding the studied area, we can use various programming such as architecture, houses, hospitals, parks, recreations, etc., in which the human bioclimatic type has a role and has been investigated. Recognizing the comfort of each area, we can program in tourism industry, as well as the h...

آسايش حرارتي با احساس رضايت و خشنودي از دماي اطراف تعريف مي شود ميزان فعاليت بدني و لباس، عامل اقليمي مانند دماي هوا و سرعت حركت هوا و رطوبت هوا، پارامترهاي اساسي تاثيرگذار در مطلوب بودن حرارت براي بشر هستند. نامطلوب بودن منجر به احساس شديد گرما و سرما در اكثر افراد مي شود. همچنين ممكن است به وسيله ي جريان هواي ناخواسته و اختلاف زياد دما بين قسمت ب...

Climatic change is one of the most important challenges human beings have confronted with in recent centuries due to its severe effects on water resources, agriculture, energy, tourism and even human bioclimatic. Developing strategies, making decisions with awareness about water consumption in different parts in the future, and available water reso...

در این پژوهش با هدف تعیین رابطه میان شاخص اختلاف پوشش گیاهی (NDVI) با استفاده از شاخص خشکسالی SPI ابتدا داده های شاخص اختلاف نرمال شده پوشش گیاهی (NDVI) از ماهواره SPOT 4 بین سالهای 1999 تا 2009 جمع آوری شده و برای استان سمنان استخراج شده و سپس سازماندهی با توجه به روش ISODATA تکرار شونده، آن را بارها و بارها انجام مي دهد که در آن واقع خوشه که ذاتی...

Climate signals are large-scale models of abnormalities in circulation and pressure and spread over wide geographical area. These signals are very important in translating the climate behaviour. In this research the relationship between precipitation and the climate signals (AO, NAO, SOI, and ENSO) in the Central Iranian zone, has been studied. The...

This paper considers the problem of contamination in process distribution as well as identifying a combination of variables which are responsible for the change in process. Three interactive steps for the control of mean vector in a contaminated multivariate normal process are proposed. The first step is to estimate the process parameters by robust...

The present research sets out to study the temporal and local distribution of showers generating flood in Zolachai river basin. To carry out this research the rainfall data of 13 non-recording and recording rain gauges over a 15-year statistical period (1986-2000) were employed. The main aim of this study is to prepare Intensity-Duration-Frequency...

A neural network combined to an artificial neural network model is used to forecast daily total atmospheric ozone over Isfahan city in Iran. In this work, in order to forecast the total column ozone over Isfahan, we have examined several neural networks algorithms with different meteorological predictors based on the ozone-meteorological relationsh...

Dwelling in cities and city development together with quick increase of population and development of industrial activities with unplanned consumption of fossil fuel have intensively increased pollutions with consequences which will cause different diseases in short period, will lead to some climatic oscillations and its environmental effects such...

The purpose of the present study is to calculate the duration times of frosts by Delphi programming. To do this, the data related to the daily minimum temperature of four meteorology stations of Lorestan Province, i.e., Khoram-Abad, Boroujerd, Doroud and Aligoudarz that enjoy a ten-year statistics (from 1993 to 2003) were obtained from the informat...