Scientific- Research Quarterly of Geographical Data (SEPEHR)

Analyzing the change in daily precipitationfrequencydistribution of Aphrodite database in Iran

Esmaeil Nasrabadi

Volume 23, Issue 92 , February 2015, , Pages 67-79

https://doi.org/10.22131/sepehr.2015.13508

Abstract

Analyzing the changes in the characteristics of daily precipitationis very important in water resources planning and cultivation patterns. In this research, the changes of the most fitting frequency distribution and its parameters over time are investigated. To this end,thenetworked daily precipitation ... Read More Analyzing the changes in the characteristics of daily precipitationis very important in water resources planning and cultivation patterns. In this research, the changes of the most fitting frequency distribution and its parameters over time are investigated. To this end,thenetworked daily precipitation data of the Middle East Aphroditeprecipitation database with a latitude and longitude of 0.25, 0.25 degreeswere used.The daily precipitation data of this database in Iran, during the period of22.03.1951 to 20.03.2007 (20453 days) was extracted using Grads software. To track the changes over time, the data was divided into two 28-year periods. The precipitation data of the first period from 22.03.1951 to 20.03.1979 was placed in an array with a dimension of 10226*2491 and the data of the second periodfrom 21.03.1979 to 20.03.2007 was placedin an array with a dimension of 10227*2491(the rows and columns represent the number of days and cells respectively).The Kolmogorov-Smirnov Goodness-of-Fit test was used to identify the most fitting distribution of rainy days. The normal and gamma type distribution functions onindividual cells of the precipitation were fitted by programming in Matlab software environment. The theoretical two- parameter and exponential gamma distribution function has been able to attain the required statistical conditions for the Goodness-of-Fit test at a 95% confidence level as the most fitting distribution in both periods.The extensive spatial and temporal changes in precipitation distribution are not confirmed as one of the components of climate change tracking. The calculation of the most fitting distribution parameters by linear torque method shows slight variations in the spatial dispersion pattern of these parameters. But, these changes do not follow a specific pattern. The mapping of the standard deviation variation indicates that in a vast part of central and western Iran, the confidence in precipitation has decreased in recent decades.

networks of rainfall databases

Esmail Nasrabadi

Volume 22, SEPEHR , July 2013, , Pages 83-88

Abstract

Access to climatic data is a fundamental prerequisite in any climatic study. In past years, data received from Meteorology organization stations were among the most reliable and acceptable data for climatic study and using precipitation data of these stations were a dominant paradigm among climatologists. ... Read More

Greenhouse superabsorbents Pentafluoride sulfur trifluoride and Methyl; a greenhouse gas

Esma'il Nasrabadi

Volume 21, Issue 81 , April 2012, , Pages 30-34

Abstract

Living with Global Changes: Climate Warming

Esma'eil Nasrabadi

Volume 12, Issue 46 , August 2003, , Pages 58-61

Abstract

The study of the evolution of human life over the centuries indicates that the type of life and livelihoods, physiological and physical characteristics, types of settlements and the degree of dependence on them ... have been different in various fields of the planet. Without bias and without geographic ... Read More The study of the evolution of human life over the centuries indicates that the type of life and livelihoods, physiological and physical characteristics, types of settlements and the degree of dependence on them ... have been different in various fields of the planet. Without bias and without geographic force, one cannot deny the role of natural and climatic factors in life. Therefore, any change in these factors can transform various aspects of human life.Although it is difficult to make a definitive statement about climate changes because of the complexity of the various factors that confront the Aerial, Aquarius, Ice and Biosphere systems of the Plant, but the consensus among scientists based on numerous studies shows the undeniable role of human being along with environmental factors in the global warming process. However, the final judgment on the role of these factors is not possible considering the information available today. A problem that will be less significant in future owing to current progress. In a general division, meteorologists and climate scientists can be classified into four categories. 1. Studies in relation to the proof of the Earth's trend of change and reduction of existing CO2; in this regard, comparison of statistics and information on meteorology, examination of past bio-climatic records, tree growth rings assessment, study on glaciers and surface water of the oceans and so on. 2- Investigating the factors affecting climate change; cases such as studying the effects of positive and negative interaction, aerosols, airborne particles, solar spots and their cycles, volcanic explosions, effects of greenhouse gases and ... can be noted. 3. Forecasting future changes using climate models; scientists' efforts to predict the future climate using the general circulation model, energy budget model, radiation transfer model, etc. can be mentioned. 4. Synthesis of the study of climate change and application of these studies in order to adapt human life and activities to new conditions. With this attitude, the first three categories of studies together can be considered as a tool for more accurate and proportionate synthesis. In this paper, we try to identify the factors influencing these changes and predict the future conditions by demonstrating the process of climate change through mentioning examples. Clearly, the proposed solutions are mere suggestions and can become much broader.

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Author = Esmaeil Nasrabadi

Analyzing the change in daily precipitationfrequencydistribution of Aphrodite database in Iran

Abstract

networks of rainfall databases

Abstract

Greenhouse superabsorbents Pentafluoride sulfur trifluoride and Methyl; a greenhouse gas

Abstract

Living with Global Changes: Climate Warming

Abstract