Editorial Type:
Article
Article Type:
Research Article

Seasonality of Large-Scale Atmosphere–Ocean Interaction over the North Pacific

Yuan Zhang Department of Atmospheric Sciences, University of Washington, Seattle, Washington

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Joel R. Norris Department of Atmospheric Sciences, University of Washington, Seattle, Washington

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John M. Wallace Department of Atmospheric Sciences, University of Washington, Seattle, Washington

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Print Publication:
01 Oct 1998
DOI:
https://doi.org/10.1175/1520-0442(1998)011<2473:SOLSAO>2.0.CO;2
Page(s):
2473–2481
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Abstract

This paper attempts to resolve a long-standing paradox concerning the season-to-season memory of sea surface temperature anomalies (SSTAs) over the North Pacific. Summertime SSTAs are confined to a shallow mixed layer that is obliterated by wind-driven mixing in late autumn or early winter storms. The mixing exposes waters that were last in contact with the surface during the previous spring. Hence, SSTAs at fixed locations exhibit little memory from summer to the next winter. Yet despite this apparent lack of memory, a well-defined pattern of summertime and autumn SSTAs exhibits significant correlations with the sea level pressure field over the North Pacific a season later.

It is shown that the dominant mode of SSTA variability over the North Pacific, as inferred from empirical orthogonal function (EOF) analysis, exhibits a rather similar spatial structure year-round, with highest amplitude during summer. By means of singular value decomposition analysis, it is shown that this pattern is much more persistent from one season to the next (and particularly from summer to the next winter) than SSTAs at fixed grid points. It is substantially more persistent from one summer to the next than from one winter to the next, reflecting the relatively greater prominence of the interdecadal variability in the summertime SSTAs.

The minor differences in the structure of the winter and summer EOFs can be attributed to the coupling with the atmospheric Pacific North American pattern during winter, which induces SSTAs off the west coast of North America opposite in polarity to those in the central and western Pacific.

* Current affiliation: National Center for Atmospheric Research, Boulder, Colorado.

Corresponding author address: Joel R. Norris, NCAR/ASP, P.O. Box 3000, Boulder, CO 80307-3000.

Abstract

This paper attempts to resolve a long-standing paradox concerning the season-to-season memory of sea surface temperature anomalies (SSTAs) over the North Pacific. Summertime SSTAs are confined to a shallow mixed layer that is obliterated by wind-driven mixing in late autumn or early winter storms. The mixing exposes waters that were last in contact with the surface during the previous spring. Hence, SSTAs at fixed locations exhibit little memory from summer to the next winter. Yet despite this apparent lack of memory, a well-defined pattern of summertime and autumn SSTAs exhibits significant correlations with the sea level pressure field over the North Pacific a season later.

It is shown that the dominant mode of SSTA variability over the North Pacific, as inferred from empirical orthogonal function (EOF) analysis, exhibits a rather similar spatial structure year-round, with highest amplitude during summer. By means of singular value decomposition analysis, it is shown that this pattern is much more persistent from one season to the next (and particularly from summer to the next winter) than SSTAs at fixed grid points. It is substantially more persistent from one summer to the next than from one winter to the next, reflecting the relatively greater prominence of the interdecadal variability in the summertime SSTAs.

The minor differences in the structure of the winter and summer EOFs can be attributed to the coupling with the atmospheric Pacific North American pattern during winter, which induces SSTAs off the west coast of North America opposite in polarity to those in the central and western Pacific.

* Current affiliation: National Center for Atmospheric Research, Boulder, Colorado.

Corresponding author address: Joel R. Norris, NCAR/ASP, P.O. Box 3000, Boulder, CO 80307-3000.

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  • Alexander, M. A., 1992: Midlatitude atmosphere–ocean interaction during El Niño. Part I: The North Pacific Ocean. J. Climate,5, 944–958.

  • ——, and C. Deser, 1995: A mechanism for the recurrence of wintertime midlatitude SST anomalies. J. Phys. Oceanogr.,25, 122–137.

  • Bottomley, M., C. K. Folland, J. Hsiung, R. E. Newell, and D. E. Parker, 1990: Global Ocean Surface Temperature Atlas. United Kingdom Meteorological Office, and Massachusetts Institute of Technology Department of Earth, Atmospheric and Planetary Sciences, 20 pp. and 313 maps.

  • Bretherton, C. S., C. Smith, and J. M. Wallace, 1992: An intercomparison of methods for finding coupled patterns in climate data. J. Climate,5, 541–560.

  • Cayan, D. R., 1992a: Latent and sensible heat flux anomalies over the northern oceans: The connection to monthly atmospheric circulation. J. Climate,5, 354–369.

  • ——, 1992b: Latent and sensible heat flux anomalies over the northern oceans: Driving the sea surface temperature. J. Phys. Oceanogr.,22, 859–881.

  • Davis, R. E., 1976: Predictability of sea surface temperature and sea level pressure anomalies over the North Pacific Ocean. J. Phys. Oceanogr.,6, 249–266.

  • ——, 1978: Predictability of sea level pressure anomalies over the North Pacific Ocean. J. Phys. Oceanogr.,8, 233–246.

  • Ferranti, L., F. Molteni, and T. N. Palmer, 1994: Impact of localized tropical and extratropical SST anomalies in ensembles of seasonal GCM integrations. Quart. J. Roy. Meteor. Soc.,120, 1613–1645.

  • Fletcher, J. O., R. J. Slutz, and S. D. Woodruff, 1983: Towards a comprehensive ocean–atmosphere dataset. Tropical Ocean Atmos. Newslett.,20, 13–14.

  • Frankignoul, C., 1985: Sea surface temperature anomalies, planetary waves and air–sea feedback in the middle latitudes. Rev. Geophys.,23, 357–390.

  • Iwasaka, N., and J. M. Wallace, 1995: Large scale air–sea interaction in the Northern Hemisphere from a viewpoint of variations in surface heat flux by SVD analysis. J. Meteor. Soc. Japan,73, 781–794.

  • Kawamura, R., 1984: Relation between atmospheric circulation and dominant sea-surface temperature anomaly patterns during northern winter. J. Meteor. Soc. Japan,62, 910–916.

  • Kushnir, Y., and J. M. Wallace, 1989: Low-frequency variability in the Northern Hemisphere winter: Geographical distribution, structure and time-scale dependence. J. Atmos. Sci.,46, 3122–3142.

  • Latif, M., and T. P. Barnett, 1994: Causes of decadal climate variability over the North Pacific/North American sector. Science,226, 634–637.

  • Namias, J., 1959: Recent seasonal interactions between North Pacific waters and the overlying atmospheric circulation. J. Geophys. Res.,64, 631–646.

  • ——, and R. M. Born, 1970: Temporal coherence in North Pacific sea-surface temperature patterns. J. Geophys. Res.,75, 5952–5955.

  • Norris, J. R., Y. Zhang, and J. M. Wallace, 1998: Role of low clouds in summertime atmosphere–ocean interactions over the North Pacific. J. Climate,11, 2482–2490.

  • Wallace, J. M., and Q. Jiang, 1987: On the observed structure of the interannual variability of the atmosphere–ocean climate system. Atmospheric and Oceanic Variability, H. Cattle, Ed., Royal Meteorological Society, 17–43.

  • ——, Y. Zhang, and K.-H. Lau, 1993: Structure and seasonality of interannual and interdecadal variability of the geopotential height and temperature fields in the Northern Hemisphere troposphere. J. Climate,6, 2063–2082.

  • Walsh, J. E., and M. B. Richman, 1981: Seasonality in the association between surface temperatures over the United States and the North Pacific Ocean. Mon. Wea. Rev.,109, 767–783.

  • Yukimoto, S., M. Endoh, Y. Kitamura, A. Kitoh, T. Motoi, A. Noda, and T. Tokioka, 1996: Interannual and interdecadal variabilities in the Pacific in an MRI coupled GCM. Climate Dyn.,12, 667–683.

  • Zhang, Y., J. M. Wallace, and D. S. Battisti, 1997: ENSO-like decadal variability over the Pacific sector. J. Climate,10, 1004–1020.

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