4 sonuçlar
Arama Sonuçları
Listeleniyor 1 - 4 / 4
Yayın Simulation of temperature and precipitation climatology for the Central Asia CORDEX domain using RegCM 4.0(Inter-Research, 2012) Öztürk, Tuğba; Altınsoy, Hamza; Türkeş, Murat; Kurnaz, Mehmet LeventThe Coordinated Regional Climate Downscaling Experiment (CORDEX) is a framework designed to coordinate international efforts on regional climate simulations. CORDEX domains encompass the majority of land areas of the world. Region 8 of the CORDEX basically covers Central Asia, with the corners of the domain at 54.76 degrees N, 11.05 degrees E; 56.48 degrees N, 139.13 degrees E; 18.34 degrees N, 42.41 degrees E; and 19.39 degrees N, 108.44 degrees E and with a horizontal resolution of 50 km. In the present study, the results of an experiment with the ICTP regional climate RegCM 4.0 model that was run for seasonal mean air temperature and precipitation total series are presented. The experiment consists of one simulation from 1989 to 2010 using ERA-Interim reanalysis data as the boundary condition, another simulation for the period 1970-2000 using the global climate model ECHAM5 A1B scenario data for forcing, and finally a simulation for the period 2070-2100 using the ECHAM5 A1B scenario projection data for forcing. Between these 3 simulations we determined the temperature and precipitation climatology obtained from RegCM 4.0 downscaling for Region 8 of the CORDEX framework. In spite of the diverse topography of the region, the temperature and precipitation climatology obtained by RegCM 4.0 from hindcast data captures the general characteristics of the climate of Central Asia. In winter, the warm temperature bias of the forcing data is slightly decreased by regional downscaling. The influences of the Indian monsoon system are well represented, as this region covers a large area towards the southern boundary of Region 8, even though the focus of this work was to capture the general characteristics of the whole region.Yayın Simulating the climatology of extreme events for the Central Asia domain using the RegCM 4.0 regional climate model(National and Kapodistrian University of Athens, 2012-05) Altınsoy, Hamza; Öztürk, Tuğba; Türkeş, Murat; Kurnaz, Mehmet Levent; Helmis, Konstantinos G.In this work, future changes in the frequency of the seasonal extreme climate events such as number, frequency, duration and intensity of heat waves (five consecutive temperature days above the maximum temperature calendar day 90th percentiles, number of days per year that is above the same percentiles and greatest number of consecutive days above these percentiles) for the period of 2071-2100 over Central Asia (18.56° – 70.13° East and 7.28° - 142.4° North) with respect to the present period of 1971-2000 were studied in detail. Regional Climate Model RegCM4.0 of Abdus Salam International Center for Theoretical Physics (ICTP) with ECHAM5 forcing data was used for hindcast and forecast projection. This region will very likely be affected by heat waves in winter and spring seasons and heat wave frequency, intensity and duration will increase sig-nificantly over the Arabian Peninsula in summer. On the other hand, cold spells will not change as much as heat waves over the region in all seasons.Yayın Simulating the climatology of extreme events for the Central Asia domain using the RegCM 4.0 regional climate model(Springer-Verlag Berlin Heidelberg, 2012-01-01) Altınsoy, Hamza; Öztürk, Tuğba; Türkeş, Murat; Kurnaz, Mehmet LeventIn this work, future changes in the frequency of the seasonal extreme climate events such as number, frequency, duration and intensity of heat waves (5 consecutive temperature days above the maximum temperature calendar day 90th percentiles, number of days per year that is above the same percentiles and greatest number of consecutive days above these percentiles) for the period of 2071–2100 over Central Asia (18.56 –70.13 East and 7.28 –142.4 North) with respect to the present period of 1971–2000 were studied in detail. Regional Climate Model RegCM 4.0 of Abdus Salam International Center for Theoretical Physics (ICTP) with ECHAM5 forcing data was used for hindcast and forecast projection. This region will very likely be affected by heat waves in winter and spring seasons and heat wave frequency, intensity and duration will increase significantly over the Arabian Peninsula in summer. On the other hand, cold spells will not change as much as heat waves over the region in all seasons.Yayın Climate change versus 'security and peace' in the Mediterranean macroclimate region: are they correlated?(Coventry University, 2011-10-28) Türkeş, Murat; Öztürk, Tuğba; Altınsoy, HamzaClimate change, whether its global or regional scale, is one of the most significant and far-reaching challenges that the human societies living in the Earth’s surface have faced in the 21st century as it was in the 20th century. Consequently, the aim of this study is to scientifically assess impacts of the global and regional climate changes and variability including decreased precipitation amounts (drying) and increased air temperatures (warming) that would very likely cause to increase frequencies, durations and intensities of the drought events in the Mediterranean basin and Turkey, and associated problems and consequences with respect to the global, regional and national peace, prosperity and security issues and concerns.
