نتایج جستجو برای: low precipitation

تعداد نتایج: 1251880  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شهید چمران اهواز - دانشکده مهندسی علوم آب 1393

drought is transient phenomenon , slow , repetitive and integral part of the climate of each region. drought begins with a substantial reduction in precipitation over the long-term average rainfall and over time, reduced soil moisture and surface and ground water resources will continue to decrease. this phenomenon is the most important in bakhtegan basin because of its importance in strategic ...

2005
Yochanan Kushnir

Most major features of the interdecadal shift in boreal winter-spring precipitation over the American continents associated with the 1976–1977 transition are reproduced in atmospheric general circulation model (GCM) simulations forced with observed sea surface temperature (SST). The GCM runs forced with global and tropical Pacific SSTs produce similar multidecadal changes in precipitation, indi...

2015
Xiumin Yan Zhen Ni Liang Chang Kehong Wang Donghui Wu Marc A. Rosen

The effect of soil warming and precipitation control in the context of soil warming on Collembola community was studied in Songnen grassland, China. Treatments included (1) control; (2) soil warming; (3) soil warming with low precipitation; and (4) soil warming with high precipitation. The open top chambers were used to increase the soil temperature, and the low and high precipitation were crea...

Journal: :Nano letters 2005
Jing Tang Franz Redl Yimei Zhu Theo Siegrist Louis E Brus Michael L Steigerwald

We report the synthesis of TiO2 nanoparticles that uses the low-temperature reaction of low-valent organometallic precursors. Bis(cyclooctatetraene)titanium reacts with dimethyl sulfoxide in organic solution at temperatures as low as room temperature to produce TiO2. In the absence of any supporting ligand, the reaction gives precipitation of amorphous TiO2 powder; however, in the presence of b...

2006
Eric P. Salathé

Recent global climate model simulations for the IPCC Fourth Assessment report show a realistic North Pacific storm track and Aleutian Low for the present-day climate conditions. Under climate change, the storm track and Aleutian Low move northward and intensify. These changes shift precipitation northward along the Pacific coast of North America. In particular, precipitation is intensified over...

Journal: :پژوهش های جغرافیای طبیعی 0
ام البنین پودینه دانش آموخته کارشناسی ارشد مهندسی منابع آب، گروه مهندسی آب، دانشکدة آب و خاک، دانشگاه زابل معصومه دلبری دانشیار گروه مهندسی آب، دانشکدة آب و خاک، دانشگاه زابل پرویز حقیقت جو استادیار گروه مهندسی آب، دانشکدة آب و خاک، دانشگاه زابل میثم امیری کارشناسی ارشد مهندسی منابع آب، گروه پژوهشی مدیریت منابع آب، پژوهشکدۀ تالاب بین المللی هامون، دانشگاه زابل

introduction the knowledge about spatial variability of precipitation is a key issue for regionalization in hydro-climatic studies. measurements of meteorological parameters by the traditional methods require a dense rain gauge network. but, due to the topography and cost problems, it is not possible to create such a network in practice. in these cases the spatial distribution pattern of precip...

2017
Qingfeng Li Guojing Yang Xiangzheng Deng

Alpine precipitation is an important component of the mountain hydrological cycle and may also be a determinant of water resources in inland river basins. In this study, based on field observation data of the upper Shule River and daily precipitation records of the Tuole weather station during 2009–2015, temporal distribution characteristics of alpine precipitation and their vertical differenti...

2011
Walter Finsinger Daniele Colombaroli Jacques-Louis De Beaulieu Verushka Valsecchi Boris Vannière Elisa Vescovi Emmanuel Chapron André F. Lotter Michel Magny Willy Tinner

Despite the high potential of pollen records for climate reconstruction, pollen–climate relationships may be biased due to past and present human activities on the landscape. We use (i) transfer functions based on modern pollen–climate relationships to infer seasonal temperature and summer precipitation for the period 11 500–4500 cal. a BP and (ii) lake-level change records based on different s...

2010
P. T. Nastos A. Vassilopoulos

In this paper we examined whether the recorded precipitation changes cause erosion in Naxos Island, Greece using precipitation indices derived from daily precipitation totals, during the period 1955–2007, in order to develop an erosion risk model. Although the mean annual precipitation appear to be low (∼360.0 mm), the erosion processes of the area are very intense, because of the intensive cha...

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