نتایج جستجو برای: aogcm models
تعداد نتایج: 908020 فیلتر نتایج به سال:
[1] The radiative effects from increased concentrations of well-mixed greenhouse gases (WMGHGs) represent the most significant and best understood anthropogenic forcing of the climate system. The most comprehensive tools for simulating past and future climates influenced by WMGHGs are fully coupled atmosphere-ocean general circulation models (AOGCMs). Because of the importance of WMGHGs as forc...
The role of climate sensitivity and ocean heat uptake in determining the range of climate model response is investigated in the second phase of the Coupled Model Intercomparison Project (CMIP2) AOGCM results. The fraction of equilibrium warming that is realized at any one time is less in those models with higher climate sensitivity, leading to a reduction in the temperature response range at th...
استفاده از خروجی مدل های گردش کلی جوّ - اقیانوس (aogcms) به منزلة معتبرترین ابزار در تحقیقات تغییر اقلیم، در حال افزایش است. تاکنون نسخه های گوناگونی از مدل های aogcm عرضه شده است که از آن جمله می توان به مدل های اولین گزارش ارزیابی هیئت بین المللی تغییر اقلیم (ipcc) تحت عنوانfar(1990) ، مدل های دومین گزارش با عنوان sar(1996)، مدل های سومین گزارش با عنوان tar(2001) و مدل های چهارمین گزارش ارزیاب...
West Africa includes a semi-arid zone between the Sahara Desert and the humid Gulf of Guinea coast, approximately between 10°N and 20°N, which is irrigated by summer monsoon rains. This article refers to the region as the Sahel. Rain-fed agriculture is the primary sustenance for Sahel populations, and severe droughts (in the 1970s and 1980s), therefore, have devastating negative societal impact...
Holocene climate variability is investigated in the North Pacific and North Atlantic realms, using alkenone-derived sea-surface temperature (SST) records as well as a millennial scale simulation with a coupled atmosphere-ocean general circulation model (AOGCM). The alkenone SST data indicate a temperature increase over almost the entire North Pacific from 7 cal kyr BP to the present. A dipole p...
Global warming due to greenhouse effect is expected to cause major changes in climate of some regions. The change of climate is likely to have a profound effect on hydrological cycle. Evapotranspiration (ET, as the major component of hydrological cycle, will affect crop water requirement and future planning and management of water resources. This study was conducted to investigate climate chang...
In modern conditions of climate change and increasing pressure on water resources, river forecasting is becoming one the urgent tasks rational use. The main tool for long-term characteristics prediction are Atmospheric Oceanic General Circulation Models (AOGCM). this paper, we assessed quality a number climatic by CMIP-6 (Coupled Model Intercomparison Project, Phase 6) AOGCMs Volga Kama basins ...
comparison of future uncertainty of aogcm-tar and aogcm-ar4 models in the projection of runoff basin
increased concentration of greenhouse gases is expected to alter the radiative balance of atmosphere, causing increases in temperature and changes in precipitation patterns and other climatic variables. these changes are associated with the changes in hydrological systems globally and at the basin scale. these changes include: precipitation patterns and extremes; the amount and generation of ri...
در تحقیقات تغییر اقلیم، استفاده از خروجی مدل‌های گوناگون AOGCM، روش‌های کوچک‌مقیاس کردن و سناریوهای انتشار گازهای گلخانه‌ای بر نتایج نهایی ت‍أثیر می‌گذارند. در این مقاله سعی شده است تا چارچوبی برای بررسی وضعیت اقلیم منطقه‌ای تحت تاثیر روش‌های گوناگون کوچک‌مقیاس کردن و مدل‌های AOGCM عرضه شود. یکی از مشکلات عمده در استفاده از خروجی مدل‌های AOGCM (Atmosphere-Ocean General circulation Model)، کم ب...
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