شماره ركورد :
1132128
عنوان مقاله :
ارزيابي بهترين دوره پايه انتخابي مدل‌هاي GCM براي تعيين متغييرهاي هواشناسي ايستگاه بيرجند در دوره‌هاي آتي
عنوان به زبان ديگر :
Evaluation the best of selective base period of GCM models to determine meteorological variables of Birjand station in future periods
پديد آورندگان :
يعقوب زاده، مصطفي دانشگاه بيرجند - گروه علوم و مهندسي آب , خاشعي سيوكي، عباس دانشگاه بيرجند - گروه علوم و مهندسي آب , رمضاني، يوسف دانشگاه بيرجند - گروه علوم و مهندسي آب , حسيني، عاطفه دانشگاه بيرجند - دانشكده كشاورزي
تعداد صفحه :
14
از صفحه :
163
تا صفحه :
176
كليدواژه :
تغييراقليم , مدل GCM , دوره پايه , متغييرهواشناسي , سناريو انتشار
چكيده فارسي :
امروزه تعيين اثر تغييراقليم برجنبه­ هاي مختلف زندگي بشريت كاملا مشهود است. در چنين شرايطي تعيين دوره پايه كه تاثيرات تغييراقليم نسبت به اين دوره تعيين مي شود بسيار حائز اهميت مي­ باشد. بدين منظور در اين تحقيق، با استفاده از مدل­هاي­ GCM، به ارزيابي دوره­ هاي پايه انتخابي براي ايستگاه سينوپتيك بيرجند پرداخته شد. براي انجام تحقيق، تعداد 27 دوره پايه حاصل از 35مدل ­گزارش پنجم تغييراقليم با دوره ­هاي مشابه حاصل از ايستگاه بيرجند مقايسه شدند. همچنين ماه­هايي كه بيشترين درصد اختلاف با نتايج مشاهداتي براي متغيير مورد نظر دارند مشخص شد. نتايج نشان داد كه براي بارش دوره ­هاي طولاني مدت ولي براي دماي بيشينه وكمينه دوره­ هايي مانند 1980-1960 نتايج رضايت بخش ارائه مي ­نمايند. با اين حال در هر سه متغيير هواشناسي، دوره 1990-1960 و دوره ­هاي 31 ساله بهترين دوره ­ها از نظر تطابق با داده مشاهداتي مي ­باشد. در بين ­ماه­هاي سال نيز ماه­هاي گرم جولاي تا سپتامبر در مورد بارش و ماه­هاي سرد دسامبر تا فوريه در مورد دماي كمينه و دماي بيشينه بيشترين درصد خطا نسبت به بقيه ماه ­ها را دارند.
چكيده لاتين :
Nowadays, determining the effect of a climate change in the various aspects of human life is quite evident. In such a situation, it is very important to determine the base period, which determines the effects of a climate change than in this period. Choosing a course-based course plays an important role in choosing future courses to conduct research on the effects of climate change. Many researchers in the research use the LARS-WG dynamic downscale method or the statistical method to measure the weather variables, which should be the same for the years of the base period and the upcoming period. This research was conducted to select the appropriate base course for estimating minimum temperature, maximum temperature and precipitation at the synoptic station in Birjand. The station is located at latitude 32 degrees and 53 degrees east and 59 degrees and 17 degrees north latitude. In order to evaluate and accuracy of the methods in this research, seven criteria for estimating root mean square error (RMSE) and mean absolute error (MAE), relative error (RD), mean relative error of the month of the year (MRDM), average relative error of the month in the year (RDMM), PBIAS and RSR. In this study, using GCM models, we assessed the selected base courses for the synoptic station in Birjand. To doing in the research, an amount of 27 base courses from 35 models of the fifth report of the change were compared with similar periods obtained from the station in Birjand. The results showed about precipitation that the duration of the base periods such as 1960-2005 and 1960-2000 is less of the RMSE and MAE errors than the rest of the courses, and the base period of 1965-1990 between periods less than 30 years and the period The 1990-1960s are also well suited to the precipitation data of the synoptic station. The maximum temperature of the 1960-1990, 1960-1985 and 1960-1995 is the lowest RMSE error. However, short-term courses of 1980-1960 and 1965-1985 present satisfactory results.In the case of minimum temperatures, periods of 21 and 31 years 1960-1980, 1960-1985, 1960-1990 and 1965- 1985 have a percentage error of RMSE and a lower percentage of PBIAS. Variable variation range can also be used to show the appropriate base course. The result showed that the periods 1960-2005 and 1970-2005 had a lower range of rainfall variation than the other variables and seems to be more suitable. However, courses such as 1990-2000, 1975-1995, and 1995-2005 have less certainty. The more courses that go into periods with shorter periods of time, the more modest and less certainty they will be. Also, if you look at changes in the 1975-2005 periods and the 1965-1995 periods, it will be clear how much each year towards the years closest to 2005 will be deducted from the precipitation daily average. The results also show that maximum temperature changes are better than precipitation, and all courses have less variation range. Nevertheless, the period of 1960-2005 has the highest degree of certainty and the period of 1975-2005 has the least degree of certainty compared to the rest of the courses. In contrast to precipitation, there are periods such as 1970-1990, which, if considered as the basis for research, provide more certainty than the longer period of 1965-2005 for maximum temperature. Also, what's most clear about the maximum temperature is the higher the period with years closer to 2005, the temperature increases, which will increase the temperature over time. The process of minimum temperature variations also indicates that in addition these changes are similar to the change in temperature, with the difference that the range of variations in the minimum temperature is somewhat higher than the maximum temperature. The period of 1960-2005 has the best degree of certainty and the period from 1975-2005 has the least degree of certainty than the rest of the courses. Although long periods of time are less certain than short periods, the result is that the longer the interval between periods increases, the more precise the results will be. The result is not entirely correct, 1975-2000 is less certainty than the 1965-2000 period and has better results in minimum temperatures. Therefore, the evaluation of selected periods of GCM models with similar periods from observations of Birjand station shows that for rainfall variables, periods with a number of years yield more satisfactory results, but for two variables the minimum temperature and maximum temperature of the periods, not long or short periods, provide less risk of RMSE and PBIAS than long periods.
سال انتشار :
1398
عنوان نشريه :
تحليل فضايي مخاطرات محيطي
فايل PDF :
7896063
لينک به اين مدرک :
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