Abstract. The efficacy of Euro-Atlantic circulation regimes for estimating wintertime climate anomalies (precipitation and surface temperature) over Europe is assessed. A comparison seasonal reconstructions from two different regime frameworks (cluster analysis the low-level zonal flow, traditional blocking indices) presented contrasted with using North Atlantic Oscillation (NAO) index. are qua...

Energetic, large-scale variability is observed in the atmosphere and ocean of the Atlantic Sector on interannual and decadal time scales. It is manifested as coherent fluctuations in temperature , rainfall, surface pressure and temperature reaching eastward to central Europe and northern Asia, southward to subtropical West Africa and westward to North and South America with a myriad of well doc...

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...

The impacts of ENSO and North American climate modes on seasonal snowfall in the Mid-Atlantic region are investigated. Particular emphasis is placed on the convergent patterns of El Nino and negative NAO during Northern Hemisphere winter. This study is motivated by the highly anomalous events associated with the 2009-2010 winter season, as well as by a general interest in mid-latitude synoptic ...

The simulated North Atlantic Oscillation (NAO) teleconnection patterns and their interannual variability are evaluated from a suite of atmospheric models participating in the second phase of the Atmospheric Model Intercomparison Project (AMIP-2). In general the models simulate the observed spatial pattern well, although there are important differences among models. The NAO response to interannu...

Paleoclimatic evidence shows that the ocean and atmosphere have undergone major changes during the Quaternary. For atmospheric mean circulation, data are consistent with changes in strength and shifts in position of major atmospheric circulation features (e.g., the westerly wind belt), whereas the structure of these main features appears to have persisted. For the ocean, evidence points to qual...

Analysis of sea surface temperature (SST) observations suggests a pan-oceanic interaction between the tropical Pacific and the Atlantic Ocean at multi-decadal time scales, such that periods of anomalously high SSTs in the eastern tropical Pacific are followed by a basinwide SST dipole in the Atlantic Ocean with a time delay of a few decades. The SST anomaly structure in the Atlantic Ocean is re...

Variations of the atmospheric angular momentum "AAM# is responsible for almost all of the observed length!of!day "LOD# variation on time scales from several days to several years\ and much of the observed polar motion on the intra!seasonal time scale[ El Nin1⁄2o:Southern Oscillation "ENSO# and Quasi!Biennial Oscillation "QBO# have been singled out to successfully explain interannual LOD variati...

The influence of large-scale climate variability on winter river discharge and precipitation across western Europe is investigated. We analyze 60 years monthly flow data from 18 major western-European rivers its relationship with dominant teleconnection patterns indices in this region. Results show that characterized by large interannual variability, best correlates (a) the North Atlantic Oscil...