نتایج جستجو برای: low precipitation

تعداد نتایج: 1251880  

2016
JUAN SULCA MATHIAS VUILLE YAMINA SILVA KEN TAKAHASHI

Extreme precipitation events in the Peruvian Andes have significant socioeconomic impacts, yet their atmospheric dynamics are poorly understood. Here austral summer (December–March) wet and dry spells and their continentaland large-scale teleconnections are analyzed using reanalysis, gridded, and in situ precipitation data. Dry and wet spells in the Peruvian Andes show a pervasive dipole patter...

2017
Fuxing Li Li He

Wavelet analysis methods (CWT, XWT, WTC) were employed to evaluate the impact of dominant climatic driving factors on summer precipitation in the Beijing area based on monthly precipitation data of Beijing ranging from 1880 to 2014. The two climatic driving factors, i.e., the East Asian summer monsoon (EASM) and the Northern Limit of Western Pacific Subtropical High (NWPSH) were considered in p...

2005
Jingyun Fang Shilong Piao Liming Zhou Jinsheng He Fengying Wei Ranga B. Myneni Compton J. Tucker Kun Tan

[1] In this paper, we use growing season Normalized Difference Vegetation Index (NDVI) as an indicator of plant growth to quantify the relationships between vegetation production and intra-annual precipitation patterns for three major temperate biomes in China: grassland, deciduous broadleaf forest, and deciduous coniferous forest. With increased precipitation, NDVI of grassland and deciduous b...

2005
Yongqiang

[ I ] The relations between monthly-seasonal soil moisture and precipitation variability are investigated by identifying the coupled patterns of the two hydrological fields using singular value decomposition (SVD). SVD is a technique of principal component analysis similar to empirical orthogonal knctions (EOF). However, it is applied to two variables simultaneously and i s capable of extractin...

2009
Yien Ling Hii Joacim Rocklöv Nawi Ng Choon Siang Tang Fung Yin Pang Rainer Sauerborn

INTRODUCTION Dengue is currently a major public health burden in Asia Pacific Region. This study aims to establish an association between dengue incidence, mean temperature and precipitation, and further discuss how weather predictors influence the increase in intensity and magnitude of dengue in Singapore during the period 2000-2007. MATERIALS AND METHODS Weekly dengue incidence data, daily ...

2014
A. Devasthale L. Norin

Using measurements from the national network of 12 weather radar stations for the 11-year period 2000–2010, we investigate the large-scale spatio-temporal variability of precipitation over Sweden. These statistics provide useful information to evaluate regional climate models as well as for hydrology and energy applications. A strict quality control is applied to filter out noise and artifacts ...

ژورنال: آبخیزداری ایران 2019

Climate change is an unprecedented change are taking place. Changes of meteorological parameters such as precipitation, maximum and minimum temperatures. Since weather forecasting is important for these parameters, in this study, the performance of Statistical Downscaling Model (SDSM and Lars-WG) were used to predict temperature and precipitation and mean of these changes for the periods 2046-2...

Journal: :آب و خاک 0
نرگس صالح نیا محمدعلی فلاحی

abstract in order to evaluation the effects of price policies (wheat guarantee price in each period and its price lag), environmental (planted area) and climatic (min and max average temperature, total annual precipitation, cold-day degree and hot-day degree) factors, we considered wheat yield in razavi-khorasan province (9 cities) for a 13-year statistical period (1371-72 to 1383-84). in this ...

Journal: :Global change biology 2017
Alan K Knapp Meghan L Avolio Claus Beier Charles J W Carroll Scott L Collins Jeffrey S Dukes Lauchlan H Fraser Robert J Griffin-Nolan David L Hoover Anke Jentsch Michael E Loik Richard P Phillips Alison K Post Osvaldo E Sala Ingrid J Slette Laura Yahdjian Melinda D Smith

Intensification of the global hydrological cycle, ranging from larger individual precipitation events to more extreme multiyear droughts, has the potential to cause widespread alterations in ecosystem structure and function. With evidence that the incidence of extreme precipitation years (defined statistically from historical precipitation records) is increasing, there is a clear need to identi...

Journal: :journal of oil, gas and petrochemical technology 2014
mohamad mahdi shadman mostafa dehghanizadeh amir hossein saeedi dehaghani mohsen vafaie sefti nader mokhtarian

the organic deposition particularly asphaltenes has many detrimental effects on the oil industries, such as plugging in pipelines, wellbore and facilities and subsequently, considerable reduction in well productivity.asphaltenes are the most polar fractions, which they have been dispersed as colloidal clusters in crude oil. the accumulation of these clusters lead to the flocculation of colloids...

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