Decadal and longer changes of the winter sea level pressure fields and related synoptic activity over the North Atlantic

Zveryaev, Igor I.

doi:10.1002/(sici)1097-0088(199909)19:11<1177::aid-joc424>3.3.co;2-w

Cited by 7 publications

(11 citation statements)

References 15 publications

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“…The NAO appears to be a genuine mode of variability of the atmosphere with a broad frequency spectrum. Sea level pressure anomalies at decadal and multidecadal scales are generally weaker than at monthly timescales but are similar in pattern with the NAO dipole conspicuous in each case [e.g., Rogers, 1990;Zveryaev, 1999]. Various indices of the NAO [e.g., Hurrell, 1995;Jones et al, 1997] show a broadly consistent picture of the long-term behavior in the last 150 years.…”

Section: Decadal Variations In the Nao And Wave Climatementioning

confidence: 85%

“…The magnitude of the expansion coefficients for significant wave height are generally greater in January and February than in the other two months, implying that these patterns are relatively important in midwinter. The pressure pattern can be identified with the East Atlantic pattern, extracted with only slight variations in other analyses of atmospheric pressure both at sea level [Rogers, 1990;Zveryaev, 1999] and in the middle troposphere [Wallace and Gutzler, 1981].…”

Section: Decadal Variations In the Nao And Wave Climatementioning

confidence: 88%

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Variability and predictability of the North Atlantic wave climate

2002

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[1] Wave climate across the ocean basins can be described using satellite altimetry; here, we concentrate on the North Atlantic region. Waves in the North Atlantic are strongly seasonal and peak in the winter season. The northeastern sector of the Atlantic and adjoining shelf seas also exhibit exceptionally high interannual variability in the winter, with monthly average significant wave height varying by up to a factor of 2 from one year to the next. The strength and geographical distribution of variability is broadly consistent throughout the winter months (December-March). A large fraction of these wave height anomalies is associated with a single pattern of pressure anomalies that resembles the North Atlantic Oscillation (NAO). A predictor based on NAO dependence is ''trained'' from relatively recent satellite data and then tested against earlier satellite and in situ data. The predictor is successful in large areas of the North Atlantic, confirming a robust relationship between wave height anomalies and the NAO over the last few decades. A substantial rise (up to 0.6 m) in monthly mean wave heights on the northeastern Atlantic during the latter part of the twentieth century is attributable to changes in the NAO. Substantial residual anomalies in wave heights exist after the influence of the NAO has been subtracted; these are partly explained by a second pair of North Atlantic patterns in wave height anomalies and sea level pressure anomalies. This ''East Atlantic'' pattern is particularly influential in midwinter and affects the southern part of the northeastern sector (including the region of Seven Stones Light Vessel).

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Section: Decadal Variations In the Nao And Wave Climatementioning

confidence: 85%

Section: Decadal Variations In the Nao And Wave Climatementioning

confidence: 88%

Variability and predictability of the North Atlantic wave climate

2002

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“…The North Atlantic Ocean influence is stronger over western Europe, whereas features of continental climate are more pronounced over eastern Europe and European Russia. Many diagnostic and modeling studies [e.g., Hurrell, 1995;Wibig, 1999;Rodwell et al, 1999;Zveryaev, 1999;Cassou and Terray, 2001;Drevillon et al, 2001;Gulev et al, 2002;Jung et al, 2003] extensively analyzed mechanisms driving regional climate variability during the cold season, whose definitions, however, varied within the period from October to March [e.g., Osborn et al, 1999] and were dependent on the data, key variables and methods of diagnostics applied. Considerably less has been done so far for the analysis of European climate variability during the other seasons (spring, summer and fall).…”

Section: Introductionmentioning

confidence: 99%

Seasonality in secular changes and interannual variability of European air temperature during the twentieth century

Zveryaev¹,

Gulev²

2009

J. Geophys. Res.

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[1] A gridded terrestrial monthly surface air temperature (AT) data set for 1901-2000 from the Climatic Research Unit (CRU), University of East Anglia, is used to investigate seasonality in the long-term AT variability over Europe. Prominent seasonal differences are detected in all considered characteristics of AT variability. Significant warming trends over western and southern Europe are found during summer and fall. In winter, the largest positive trends are observed mostly in southern Europe, whereas during spring, they are detected over Scandinavia and northeastern European Russia. The spatial-seasonal differentiation of warming trends implies that, in different parts of Europe, different seasons play the role as major contributor to the warming trend. The first empirical orthogonal functions (EOF) modes of winter, spring, and fall AT over Europe are associated with the North Atlantic Oscillation (NAO) and explain about 50% of AT variability. For the summer season, the second EOF mode (explaining only 15% of AT variance) might be associated with the summer NAO but has a very different (compared to other seasons) spatial pattern and principal components. The second EOF mode of the winter AT might be linked to the East Atlantic/West Russia (EAWR) teleconnection pattern. Analysis of running correlations between the principal components of the leading EOF modes of AT and the NAO index has revealed nonstationarity of the links between European AT and the NAO and evident seasonality in their long-term changes. Subsequent singular value decomposition analysis performed for the climatic periods of strong/weak links to the NAO revealed considerable interdecadal changes both in the strength and the structure of the links between European AT and regional atmospheric circulation.Citation: Zveryaev, I. I., and S. K. Gulev (2009), Seasonality in secular changes and interannual variability of European air temperature during the twentieth century,

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“…in the Atlantic-European sector and the atmospheric circulation has been the subject of many observational and modeling studies in the past. Most of these studies were focused on the cold season [Hurrell, 1995;Wibig, 1999;Rodwell et al, 1999;Zveryaev, 1999;Cassou and Terray, 2001;Drevillon et al, 2001]. Such interest in the winter climate is understandable, because winter months are dynamically the most active, and therefore perturbations in the atmospheric circulation can grow to large amplitudes.…”

Section: Introductionmentioning

confidence: 99%

Seasonality in precipitation variability over Europe

Zveryaev

2004

J. Geophys. Res.

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[1] A gridded monthly and pentad precipitation for 1979-2001 from the Climate Prediction Center Merged Analysis of Precipitation (CMAP) data set and terrestrial monthly gauge-based precipitation for 1958-1998 from the Climatic Research Unit, University of East Anglia (CRU), data set are used to investigate seasonality in the longand short-term precipitation variability over Europe. Prominent seasonal differences are detected both in precipitation climatologies and in characteristics of precipitation variability. It is shown that over western Europe the summer precipitation climatology and its year-to-year variability (expressed by standard deviations) are lower than those of the winter precipitation. Major seasonal differences are found over central eastern Europe. In this region the summer precipitation climatology and magnitudes of its interannual variability exceed respective winter characteristics by a factor of 2-3.5. Similar relationships are found for the summer and winter magnitudes of intraseasonal fluctuations of precipitation. The first empirical orthogonal function (EOF) modes of both summer and winter seasonal mean precipitation over Europe are associated with the North Atlantic Oscillation (NAO). However, they explain very different (42% for winter and 25% for summer) fractions of total precipitation variability and form principally different spatial patterns. Temporal behavior of the respective principal components is also essentially different. The first EOF mode of the winter magnitudes of intraseasonal precipitation fluctuations is also associated with the NAO. The second EOF mode of the winter precipitation is linked to the East Atlantic teleconnection pattern. However, the respective mode in the magnitudes of intraseasonal fluctuations was not detected. The second EOF mode of the summer precipitation is associated with the 500 hPa heights pattern, which is characterized by four anomaly centers. Two major centers of opposite polarity are located over western Europe and Scandinavia-northeastern European Russia.

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Decadal and longer changes of the winter sea level pressure fields and related synoptic activity over the North Atlantic

Cited by 7 publications

References 15 publications

Variability and predictability of the North Atlantic wave climate

Variability and predictability of the North Atlantic wave climate

Seasonality in secular changes and interannual variability of European air temperature during the twentieth century

Seasonality in precipitation variability over Europe

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