نتایج جستجو برای: 500 hpa geo
تعداد نتایج: 106780 فیلتر نتایج به سال:
Abstract The influence of Rossby waves emitted in the northeastern Pacific Ocean on Northern Hemisphere’s atmosphere during summer is analysed using ERA5 reanalysis and a new large ensemble performed with EC-Earth3 model. Wave Sources (RWS) trigger wave-like patterns arising from upper troposphere north-eastern region, causing response around Hemisphere alternating regions positive negative cor...
The best test for the assessment of the hypothalamic-pituitary-adrenal (HPA) axis remains a matter of controversy. We compared the performance of the short synacthen test (SST, 250 microg) with the insulin stress test (IST) to assess the reliability of the former as a first line test. Patients with pituitary disease underwent both the SST and the IST. The results in patients who had both tests ...
Based on 40 years of daily precipitation, 272 extreme precipitation days in the Northern Xinjiang region are defined. Using data these days, four spatial patterns were obtained through principal component analysis. Then, daily-averaged reanalysis used to analyze variations synoptic systems and two before after. The rainfall centers shifted with influential at 500 hPa. Water vapor western Tiansh...
This study investigates the impact of central Pacific (CP) El Niño–Southern Oscillation (ENSO) on tropical cyclone (TC) frequency over western North (WNP) decadal and interannual timescales. The CP ENSO-TC relationship is strong significant only timescales, with enhanced TC formation most WNP associated warm ENSO phases. changes, driven by ENSO, exhibit a southeast–northwest dipole pattern simi...
کشور ایران به جهت قرار گیری بر روی کمربند بیابانی نیمکره شمالی، آب و هوای خشک و بیابانی بر قسمت های زیادی از آن مستولی است. به دلیل همین موقعیت جغرافیایی ریزش های جوی در حیات و زندگی انسانی و جانوری آن نقش بسیار مهمی دارد و با توجه به این که منابع رطوبتی کشور در خارج از آن قرار دارد و این ریزش های جوی از سالی به سال دیگر نوسان دارند نقش سامانه های باران زا پررنگ تر می شود. یکی از مکانیسم های مه...
This paper addresses the anomaly correlation of the 500-hPa geopotential heights from a suite of global multimodels and from a model-weighted ensemble mean called the superensemble. This procedure follows a number of current studies on weather and seasonal climate forecasting that are being pursued. This study includes a slightly different procedure from that used in other current experimental ...
In order to better understand the formation mechanism of rainstorm in China and promote disaster prevention reduction, based on meteorological data National Meteorological Information Center Japan Agency, this paper draws isobaric surface map 850 hPa 500 hPa, relative humidity precipitation distribution map. study, synoptic methods were used analyze heavy process North from August 23th 24th, 20...
Despite the need to understand the impact of changes in emissions and climate on tropospheric ozone, the attribution of tropospheric interannual ozone variability to specific processes has proven difficult. Here, we analyze the stratospheric contribution to tropospheric ozone variability and trends from 1953 to 2005 in the Northern Hemisphere (NH) mid-latitudes using four ensemble simulations o...
تحقیق حاضر به منظور ارزیابی عملکرد اقدامات آبخیزداری وتحلیل اقتصادی این پروژه ها در کاهش خسارت سیلاب شهر خرم آباد واقع در استان لرستان انجام شده است. بدین منظور پس از انجام شبیه سازی هیدرولوژیک، در بالا دست حوزه آبخیز با استفاده از نرم افزار hec-hms، دبی اوج سیلاب های با دوره بازگشت 2، 5، 10، 25، 50، 100، 200 و 500 ساله مشخص شد. سپس با استفاده از مدل hec-ras تحلیل هیدرولیکی انجام پذیرفت و پروفی...
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