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- W2049203750 abstract "CR Climate Research Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsSpecials CR 18:63-69 (2001) - doi:10.3354/cr018063 Interannual changes of the ocean wave variability in the North Atlantic and in the North Sea E. Bauer* Potsdam Institute for Climate Impact Research, PO Box 601203, 14412 Potsdam, Germany *E-mail: bauer@pik-potsdam.de ABSTRACT: A high-resolution ocean wave hindcast for 1981 to 1993 with the WAM wave model is used to study the mean sea state and its dominant modes of variability in the North Atlantic and in the North Sea. The wind and wave data share high correlation coefficients with the North Atlantic Oscillation (NAO) index of the winter season and rather low correlation coefficients with the monthly NAO index. The low correlations are induced by the different modes of variability. The NAO index varies at semiannual and shorter periods and the wind and wave data vary with the seasonal cycle. In addition, considerably unsteady variability is apparent at synoptic scales. The dominant modes of that variability, retrieved by a wavelet analysis, are similar for wind and wave data of the same year but may change considerably from year to year. From 1987 to 1989, when the NAO index increases, the dominant period of variability also increases. The same trend is inferred from wind and wave measurements at Ocean Weather Station M. In contrast, the dominant periods inferred from data of the southern North Sea show a reverse trend. This indicates that the wave variability in the North Sea is reduced when the westerlies are more zonal, and is intensified when the westerlies are less zonal through more meridional contributions initiated by the Northeast Atlantic wind and wave variability. KEY WORDS: NAO index · Wind fields · Significant wave height · Wavelet power spectrum · Synoptic-scale variability Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in CR Vol. 18, No. 1-2. Online publication date: October 18, 2001 Print ISSN: 0936-577X; Online ISSN: 1616-1572 Copyright © 2001 Inter-Research." @default.
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- W2049203750 date "2001-01-01" @default.
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- W2049203750 title "Interannual changes of the ocean wave variability in the North Atlantic and in the North Sea" @default.
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