نتایج جستجو برای: temperature trend

تعداد نتایج: 566926  

Journal: :Atmosphere 2023

The present study investigated the significant sea surface temperature (SST) warming trend during summer season over Arabian Gulf (AG) and its links with large-scale atmospheric driver, namely, Atlantic multidecadal oscillation (AMO), from 1900 to 2021. link between AMO AGs oceanic circulations has received little scientific attention. It been found that there is a spatial positive trend, maxim...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2003
mohammad shahrokhi mir esmaeil masoumi mojtaba sadrameli jafar towfighi darian

in thermal cracking plants, it is desired to apply an optimal temperature profile along the reactor to minimize the operation cost. in this article a simulator is developed by the use of a mathematical model, which describes the static operation of a naphtha thermal cracking pilot plant. the model is used to predict the steady state profiles of the gas temperature and product yields. using a dy...

Journal: :اکو هیدرولوژی 0
مجید کاظم زاده دانشجوی دکتری مهندسی آبخیزداری ـ آب، دانشکدۀ منابع طبیعی دانشگاه تهران آرش ملکیان دانشیار دانشکدۀ منابع طبیعی دانشگاه تهران علیرضا مقدم نیا دانشیار دانشکدۀ منابع طبیعی دانشگاه تهران شهرام خلیقی سیگارودی دانشیار دانشکدۀ منابع طبیعی دانشگاه تهران

shift changes and heterogeneity analyses of hydro-climatic variables is very important in water resources planning and management. in order to shift changes and heterogeneity analyses of tmin and tmax, precipitation and discharge, 2, 7 and 7 stations was used over the 40 years (1972-2011), respectively. the results of annual tmin and tmax series showed that both of two stations had the signific...

Seed priming is one of the most important techniques used to improve seed germination under biotic and abiotic stresses. For this purpose, germination and seedling growth characteristics of primed seeds of Tall wheatgrass (Agropyron elongatum (Host.) P. Beauv) were evaluated under drought and low-temperature condition. A factorial experiment was conducted on the basis of randomized completely b...

ژورنال: علوم آب و خاک 2022

Dust storms in arid and semi-arid regions have harmful impacts on the environment, the economy, and the health of local and global communities. In this study, the frequency of annual dust events in twenty-five stations and five climatic variables including rainfall, maximum annual wind speed, average annual wind speed, maximum annual temperature, and average annual temperature in arid regions o...

Journal: :جغرافیا و مخاطرات محیطی 0
مصطفی کرم پور بهروز نصیری زهره مریانجی پارسا غلامی خدیجه مرادی سعید بساطی

kermanshah station as station coordinates 34 degrees 21 minutes north latitude and 47 degrees9 minutes east longitude has been extreme temperature fluctuations and predict for the analysis of kermanshah and their relationship with the nao is considered to carry out this study, data relating to the maximum annual absolute maximum temperature.. رnowadays one of the most important discussions in t...

ژورنال: علوم آب و خاک 2020

The occurrence of wind erosion and the spread of dust particles can be regarded as one of the most important and threatening environmental factors. Climate change and the frequency of droughts have played an important role in exacerbating or weakening these events. The primary objective of the present study was to investigate the trend of changes in four important climatic elements (precipitati...

2004
PETR CHYLEK GLEN LESINS

The Greenland coastal temperatures have followed the early 20th century global warming trend. Since 1940, however, the Greenland coastal stations data have undergone predominantly a cooling trend. At the summit of the Greenland ice sheet the summer average temperature has decreased at the rate of 2.2 ◦C per decade since the beginning of the measurements in 1987. This suggests that the Greenland...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2006
M Pascual J A Ahumada L F Chaves X Rodó M Bouma

The incidence of malaria in the East African highlands has increased since the end of the 1970s. The role of climate change in the exacerbation of the disease has been controversial, and the specific influence of rising temperature (warming) has been highly debated following a previous study reporting no evidence to support a trend in temperature. We revisit this result using the same temperatu...

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Electrical conduction anomaly was observed in the mixed ion-polaron regime for xAg2O-40TeO2-(60-x)V2O5 glassy system with 0 ≤x≤ 50 mol%, which were prepared by common melt quenching method. For the understudied glasses, the temperature dependence of dc electrical conductivity was measured from a characteristic temperature to 380 K, which certified their semiconducting nature. The measured condu...

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