نتایج جستجو برای: middle right 500 hpa
تعداد نتایج: 511961 فیلتر نتایج به سال:
This paper presents an analysis of the frequency and spatial distribution of droughts in Argentina during the 20th century. Special attention is given to the mean monthly atmospheric circulation associated with dry conditions in the Pampas during the second half of the century. A reduction in the number of dry cases is found throughout the century, especially during the warm season (October to ...
The predictability of Cyclone Sidr in the Bay of Bengal was explored in terms of track and intensity using the Advanced Research Hurricane Weather Research Forecast (AHW) model. This constitutes the first application of the AHW over an area that lies outside the region of the North Atlantic for which this model was developed and tested. Several experiments were conducted to understand the possi...
A statistical model (relationship) between a new circulation instability index and the registered temperature anomalies in two regions of Europe has been proposed tested. The average values this index, calculated at levels 850 hPa 500 hPa, were used as predictors modelling by months for period 2011–2020. monthly geopotential during utilized to calculate these regions. For each them, following c...
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 ...
The autumn precipitation over southwest China is one of the main causes meteorological disasters. Using observed monthly station rainfall data and HadISST NCEP/NCAR analysis data, impacts three types El Niño-Southern Oscillation (ENSO) events on boreal were determined. Over China, constitutes > 20% total annual a marked decline in commenced around 1990. During La Niña events, there surp...
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