نتایج جستجو برای: north atlantic oscillation nao
تعداد نتایج: 221632 فیلتر نتایج به سال:
The Romanian Carpathians are located at the confluence of three major atmospheric pressure fields: the North Atlantic, the Mediterranean and the Siberian. Despite its importance for understanding past human impact and climate change, high-resolution palaeoenvironmental reconstructions of Holocene hydroclimate variability, and in particular records of extreme precipitation events in the area, ar...
[1] We have analyzed the mean climate response pattern following large tropical volcanic eruptions back to the beginning of the 17th century using a combination of proxybased reconstructions and modern instrumental records of cold-season surface air temperature. Warm anomalies occur throughout northern Eurasia, while cool anomalies cover northern Africa and the Middle East, extending all the wa...
Decadal-scale regime shifts in Northwest Atlantic shelf ecosystems can be remotely forced by climateassociated atmosphere–ocean interactions in the North Atlantic and Arctic Ocean Basins. This remote climate forcing is mediated primarily by basinand hemispheric-scale changes in ocean circulation. We review and synthesize results from process-oriented field studies and retrospective analyses of ...
The distribution of the daily wintertime North Atlantic Oscillation (NAO) index in the 40-yr ECMWF ReAnalysis (ERA-40) is significantly negatively skewed. Dynamical and statistical analyses both suggest that this skewness reflects the presence of two distinct regimes—referred to as ‘‘Greenland blocking’’ and ‘‘subpolar jet.’’ Changes in both the relative occurrence and in the structure of the r...
The nature and causes of the recent increase in North Atlantic wave heights are explored by combining a numerical hindcast with a statistical analysis. The numerical hindcast incorporates a 10-yr history (1980–89) of North Atlantic, twice daily wind analyses to generate a monthly averaged significant wave height (SWH) history. The hindcast compares favorably with published monthly averaged SWH ...
A high-quality hydrographic CTD and Argo float data was used to study the property changes along westward branch of Mediterranean Outflow Water (MOW) in northeast Atlantic between 1981 2018. In this period, temperature salinity are marked by periods cooling/freshening warming/salinification. Since 1981, MOW properties at core decreased −0.015 ± 0.07 °C year−1 −0.003 0.002 year−1. The different ...
[1] We develop a modeling framework to investigate the influence of the North Atlantic Oscillation (NAO) on phenological variability in Europe through its influence on the distribution of wintertime synoptic-scale surface temperature variability. The approach employs an eigendecomposition of NCEP daily winter surface temperature estimates from the latter twentieth century to represent the spati...
[1] The winters of 2009–2010 and 2010–2011 brought frigid temperatures to parts of Europe, Russia, and the U.S. We analyzed regional and Northern Hemispheric (NH) daily temperature extremes for these two consecutive winters in the historical context of the past 63 years. While some parts clear ly experienced very cold temperatures, the NH was not anomalously cold. Extreme warm events were much ...
Abstract New observational evidence for variability of the atmospheric response to wintertime El Niño-Southern Oscillation (ENSO) is found. Using different approaches and datasets, a weakening in recent ENSO teleconnection over North Atlantic-European (NAE) region demonstrated. Changes both pattern strength indicate turning point 1970s with shift from resembling Atlantic (NAO) an anomaly orthog...
Structural changes, or changepoints, coinciding in multiple ice core records over the Greenland Ice Sheet (GrIS) may reflect a widespread response of GrIS to atmospheric forcing. Thus, better understand how circulation regulate sudden changes δ18O precipitation, we seek synchronous changepoints occurring core-derived time series across and North Atlantic Oscillation (NAO) past millennium. By ut...
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