نتایج جستجو برای: ecmwf era interim
تعداد نتایج: 93208 فیلتر نتایج به سال:
در این مقاله عملکرد مدل میانمقیاس پیشبینی وضع هوای WRF با هستۀ دینامیکی ARW برای شبیهسازی میدان باد در منطقۀ خلیج فارس تحت شرایط مرزی و اولیۀ مختلف ارزیابی و بررسی شده است. برای این منظور از سه نوع مجموعه دادۀ ERA-Interim، NCEP-FNL و NCEP-R2 برای تأمین شرایط اولیه و مرزی مدل استفاده شده است. سه نوع شبیهسازی مختلف WRF در این مقاله انجام گرفت و برای مقایسۀ خروجی باد مدل تحت شرایط مرزی و اولیۀ...
This note has been prepared by the Physical Aspects Section of the Research Department at ECMWF. ECMWF is an operational centre for medium range weather forecasting, monthly forecasting, seasonal forecasting and ocean wave forecasting. The operational system is also used for re-analysis projects (ERA-15, ERA-40 and ERA-Interim). ECMWF operates a state of the art global atmospheric model with an...
The large-scale vertical moist thermodynamic structure of the Madden–Julian oscillation (MJO) was documented using the first 2.5 yr (2002–05) of version 4 atmospheric specific humidity and temperature profiles from the Atmospheric Infrared Sounder (AIRS). In this study, this issue is further examined using currently available 7-yr version 5 AIRS data (2002–09) to test its dependence on the AIRS...
Long-term global satellite and reanalysis soil moisture products have been available for several years. In this study, in situ soil moisture measurements from 2008 to 2012 over Southwest China are used to evaluate the accuracy of four satellite-based products and one reanalysis soil moisture product. These products are the Advanced Microwave Scanning Radiometer for the Earth observing system (A...
This study evaluates the temporal variability of the Antarctic surface mass balance, approximated as precipitation minus evaporation (P 2 E), and Southern Ocean precipitation in five global reanalyses during 1989–2009. The datasets consist of the NCEP/U.S. Department of Energy (DOE) Atmospheric Model Intercomparison Project 2 reanalysis (NCEP-2), the Japan Meteorological Agency (JMA) 25-year Re...
برای اجرای این پژوهش، مقادیر بارش شبکهای سهساعتی نسخة ERA-Interim پایگاه دادة مرکز پیشبینی میانمدت جوی اروپایی (ECMWF) بر روی گسترة ایران با تفکیک مکانی 125/0 درجة قوسی طی بازة زمانی 01/01/1979 تا 31/12/2013 استخراج شد. طی این بازة زمانی، دادههای بارش مشاهدهشده بر روی پیمونگاههای همدید و پایگاه دادة ملی اسفزاری نیز آماده شد. یافتهها نشان داد که نهتنها از نگاه هماهنگی زمانی، بلکه بهلحا...
The new generation of weather observatory satellites, namely Global Precipitation Measurement (GPM) constellation satellites, is the lead observatory of the 10 highly advanced earth orbiting weather research satellites. Indeed, GPM is the first satellite that has been designed to measure light rain and snowfall, in addition to heavy tropical rainfall. This work compares the final run of the Int...
The 40-yr ECMWF Re-Analysis (ERA-40) data are analyzed to demonstrate that wave forcing at lower latitudes plays a crucial role in driving the tropical upwelling portion of the Brewer–Dobson circulation. It is shown that subtropical wave forcing is correlated with tropical upwelling on both intraseasonal and interannual time scales when transient waves are taken into account, and that tropical ...
A new tropopause definition involving a flow-dependent blending of the traditional thermal tropopause with one based on potential vorticity has been developed and applied to the European Centre for Medium-Range Weather Forecasts (ECMWF) reanalyses (ERA), ERA-40 and ERA-Interim. Global and regional trends in tropopause characteristics for annual and solsticial seasonal means are presented here, ...
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