نتایج جستجو برای: climate changes

تعداد نتایج: 1011976  

2004
W. S. Gordon J. S. Famiglietti

[1] Using the VEMAP Phase 2 data set, we tested the hypothesis that changes in climate would result in changes in the water balance as projected by four terrestrial ecosystem models: BIOME-BGC, Century, LPJ, and MC1. We examined trends in runoff and actual evapotranspiration (AET), changes in runoff in relation to changes in precipitation, and differences in runoff ratios as produced by these m...

Journal: :journal of agricultural science and technology 2010
f. shahbazi a. a. jafarzadeh f. sarmadian m. r. neyshabouri sh. oustan

regional impact studies of the future climate change effects are necessary because projected changes in meteorological variables differ from one region to another, and different climate systems can react in varied ways to the same changes. in this study, the effects of climate change on bioclimatic deficiency were compared in two cultivation methods (irrigated and rainfed) in a semi-arid region...

2008
Gerard H. Roe

Glacier are pretty and move around a lot on the landscape due to the random stochastic climate forcing inherent to a constant climate. They obviously also respond to changes in climate. The tricky part is whether, in absence of direct instrumental measurements, climate changes can be inferred from variations in glacier length.

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 ...

ژورنال: علوم آب و خاک 2008
اسماعیلی, عبدالکریم , واثقی , الهه ,

This study used a Ricardian approach to measure the impact of climate change on Iranian wheat production and analyzed potential impacts of further climate changes. The study utilized time series data for the period 1984-2004 pooled over 17 provinces. Results showed that climate change has significant nonlinear impacts on net revenue per hectare of wheat in Iran. The results also showed that ris...

Journal: :نشریه علمی - پژوهشی هیدرولوژی کاربردی 0
maedeh razavi zade karim solaimani esmaeil sailakhori

climate is a complex system which is changing mainly due to the increase of greenhouse gases. because of the importance of climate change and the effects it can have on water resources, in recent years, this topic has been taken into consideration for different basins on earth. the objective of this study is to investigate the effects of climate change and forecasting meteorological variables o...

Journal: :international journal of health policy and management 2014
anthony j mcmichael

human-induced climate change, with such rapid and continuing global-scale warming, is historically unprecedented and signifies that human pressures on earth’s life-supporting natural systems now exceed the planet’s bio-geo-capacity. the risks from climate change to health and survival in populations are diverse, as are the social and political ramifications. although attributing observed health...

اسماعیلی, عبدالکریم , واثقی , الهه ,

This study used a Ricardian approach to measure the impact of climate change on Iranian wheat production and analyzed potential impacts of further climate changes. The study utilized time series data for the period 1984-2004 pooled over 17 provinces. Results showed that climate change has significant nonlinear impacts on net revenue per hectare of wheat in Iran. The results also showed that ris...

2007
Shiliang Wu Loretta J. Mickley Eric M. Leibensperger Daniel J. Jacob David Rind David G. Streets

[1] We investigate the effects on U.S. ozone air quality from 2000–2050 global changes in climate and anthropogenic emissions of ozone precursors by using a global chemical transport model (GEOS-Chem) driven by meteorological fields from the NASA Goddard Institute for Space Studies general circulation model (NASA/GISS GCM). We follow the Intergovernmental Panel on Climate Change A1B scenario an...

Journal: :اکو هیدرولوژی 0
مسعود گودرزی استادیار، پژوهشکدۀ حفاظت خاک و آبخیزداری، تهران برومند صلاحی دانشیار، دانشکدۀ علوم انسانی، دانشگاه محقق اردبیلی، اردبیل سید اسعد حسینی دانشجوی دکتری، دانشکدۀ علوم انسانی، دانشگاه محقق اردبیلی، اردبیل

climate change is one of the most important problems in the present century. so assessing and prediction of future changes is important on water resources and so important for economics and socio-economic consequences. the purpose of this research is assessing the effects of climate change on surface runoff volumes under the scenarios: a1b, a2 and b1 using hadcm3 general circulation model and i...

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