نتایج جستجو برای: north atlantic oscillation nao

تعداد نتایج: 221632  

2013
José C. Báez Luis Gimeno Moncho Gómez-Gesteira Francisco Ferri-Yáñez Raimundo Real

We explored the possible effects of the North Atlantic Oscillation (NAO) and Arctic Oscillation (AO) on interannual sea surface temperature (SST) variations in the Alborán Sea, both separately and combined. The probability of observing mean annual SST values higher than average was related to NAO and AO values of the previous year. The effect of NAO on SST was negative, while that of AO was pos...

Journal: :The Holocene 2021

The European climate during the Holocene period is characterised by frequent changes of temperature and precipitation. North Atlantic plays a major role as driver for dominant precipitation source, particularly western north African realm. Atmospheric pressure gradients over (North Oscillation, NAO), circulation patterns (Atlantic Multidecadal AMO) or positioning jet stream have been suggested ...

Journal: :Remote Sensing 2014
Cecile S. Rousseaux Watson W. Gregg

We used the NASA Ocean Biogeochemical Model (NOBM) combined with remote sensing data via assimilation to evaluate the contribution of four phytoplankton groups to the total primary production. First, we assessed the contribution of each phytoplankton groups to the total primary production at a global scale for the period 1998–2011. Globally, diatoms contributed the most to the total phytoplankt...

2009
Sergio M. Vicente-Serrano Santiago Beguería Juan I. López-Moreno Ahmed M. El Kenawy Marta Angulo

We employed a novel method that combined probabilistic analysis and spatial modeling assisted by GIS to analyze the risk of extreme precipitation in Northeast Spain related to three atmospheric circulation configurations: the North Atlantic Oscillation (NAO), Mediterranean Oscillation, and Western Mediterranean Oscillation (WeMO). The analysis was performed at an event-based scale using data ob...

Journal: :Philosophical transactions. Series A, Mathematical, physical, and engineering sciences 2005
M N Tsimplis D K Woolf T J Osborn S Wakelin J Wolf R Flather A G P Shaw P Woodworth P Challenor D Blackman F Pert Z Yan S Jevrejeva

Within the framework of a Tyndall Centre research project, sea level and wave changes around the UK and in the North Sea have been analysed. This paper integrates the results of this project. Many aspects of the contribution of the North Atlantic Oscillation (NAO) to sea level and wave height have been resolved. The NAO is a major forcing parameter for sea-level variability. Strong positive res...

2003
Nicholas R. Bates Dennis A. Hansell

A dichotomy exists between rates of nitrogen fixation directly measured by biological techniques, and rates inferred from the geochemical distributions of excess nitrate within the thermocline of the North Atlantic Ocean. Part of the dichotomy relates to the temporal and spatial uncoupling between the event (i.e., nitrogen fixation by diazotrophs) and signal (i.e., excess nitrate (DINxs) in the...

2007
L. A. RASMUSSEN H. CONWAY

A simple model using once-daily US National Centers for Environmental Prediction/US National Center for Atmospheric Research (NCEP/NCAR) re-analysis upper-air values estimates winter balance, summer balance and net balance at ten glaciers in Norway and two in Sweden with 0:37 r2 0:90: The October–May Arctic Oscillation (AO), an index of sea-level pressure (SLP) in the Northern Hemisphere, corre...

Journal: :جغرافیا و مخاطرات محیطی 0
مجید رضائی بنفشه محمد سعید نجفی حبیبه نقی زاده شعیب آب خرابات

introduction long-term annual extreme climate events, especially temperature and precipitation, have generally been used as indicators for the assessment of climate change. one of the most changeable climatic variables in time and space is precipitation. there are great number of research papers focusing on extreme precipitation on global, regional and national scales have been written. the res...

2009
Zhiwei Wu Bin Wang Jianping Li Fei-Fei Jin

[1] How to predict the year-to-year variation of the east Asian summer monsoon (EASM) is one of the most challenging and important tasks in climate prediction. It has been recognized that the EASM variations are intimately but not exclusively linked to the development and decay of El Niño or La Niña. Here we present observed evidence and numerical experiment results to show that anomalous North...

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