Decadal Air–Sea Interaction in the North Atlantic Based on Observations and Modeling Results

Sirpa Häkkinen NASA Goddard Space Center, Greenbelt, Maryland

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Abstract

The decadal, 12–14-yr cycle observed in the North Atlantic SST and tide gauge data was examined using the NCEP–NCAR reanalyses, the Comprehensive Ocean–Atmosphere Data Set, and an ocean model simulation. SST data are contrasted with tide gauge data, which shows that in SST the decadal mode is nonstationary with strong variability for the last 40–50 yr, but the sea level at the southeastern U.S. coast exhibits a robustly regular variability at this period for the last 75 yr. Thus, sea level variability gives credibility to the existence of a decadal mode. The main finding is that this 12–14-yr cycle can be constructed based on the leading mode of the surface heat flux, which implicates the participation of the thermohaline circulation. This cycle has potential to be a coupled mode because three necessary aspects of a coupled mode are found: a positive feedback between the atmosphere and ocean in the subpolar gyre, a negative feedback of the overturning variability on itself, and a delayed adjustment through midlatitude Rossby waves to these processes. During the cycle, starting from the positive index phase of the North Atlantic oscillation (NAO), positive SST and oceanic heat content anomalies exist in the subtropics. The warm anomalies advect to the subpolar gyre where they are amplified by local heat flux, that is, a positive feedback between the atmosphere and ocean. At the same time the advection of warm anomalies to the subpolar gyre constitutes of a negative feedback of the thermohaline circulation on itself. The effect of this internal feedback of the ocean is amplified by the positive feedback between the atmosphere and ocean. Consequently the oceanic thermohaline circulation slows down and the opposite cycle starts. The adjustment to the changes in overturning is mediated by midlatitude Rossby waves. They are responsible for the subtropical heat content anomalies that later advect to the high latitudes. This analysis suggests that the two principal modes of heat flux variability, corresponding to patterns similar to the NAO and the Western Atlantic, are part of the same decadal cycle.

Corresponding author address: Dr. Sirpa Häkkinen, NASA Goddard Space Flight Center, Code 971, Greenbelt, MD 20771.

Abstract

The decadal, 12–14-yr cycle observed in the North Atlantic SST and tide gauge data was examined using the NCEP–NCAR reanalyses, the Comprehensive Ocean–Atmosphere Data Set, and an ocean model simulation. SST data are contrasted with tide gauge data, which shows that in SST the decadal mode is nonstationary with strong variability for the last 40–50 yr, but the sea level at the southeastern U.S. coast exhibits a robustly regular variability at this period for the last 75 yr. Thus, sea level variability gives credibility to the existence of a decadal mode. The main finding is that this 12–14-yr cycle can be constructed based on the leading mode of the surface heat flux, which implicates the participation of the thermohaline circulation. This cycle has potential to be a coupled mode because three necessary aspects of a coupled mode are found: a positive feedback between the atmosphere and ocean in the subpolar gyre, a negative feedback of the overturning variability on itself, and a delayed adjustment through midlatitude Rossby waves to these processes. During the cycle, starting from the positive index phase of the North Atlantic oscillation (NAO), positive SST and oceanic heat content anomalies exist in the subtropics. The warm anomalies advect to the subpolar gyre where they are amplified by local heat flux, that is, a positive feedback between the atmosphere and ocean. At the same time the advection of warm anomalies to the subpolar gyre constitutes of a negative feedback of the thermohaline circulation on itself. The effect of this internal feedback of the ocean is amplified by the positive feedback between the atmosphere and ocean. Consequently the oceanic thermohaline circulation slows down and the opposite cycle starts. The adjustment to the changes in overturning is mediated by midlatitude Rossby waves. They are responsible for the subtropical heat content anomalies that later advect to the high latitudes. This analysis suggests that the two principal modes of heat flux variability, corresponding to patterns similar to the NAO and the Western Atlantic, are part of the same decadal cycle.

Corresponding author address: Dr. Sirpa Häkkinen, NASA Goddard Space Flight Center, Code 971, Greenbelt, MD 20771.

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  • Bjerknes, J., 1964: Atlantic air–sea interaction. Advances in Geophysics, Vol. 10, Academic Press, 1–82.

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

  • daSilva, A. M, C. C. Young, and S. Levitus, 1994: Algorithms and Procedures. Vol. 1, Atlas of Surface Marine Data 1994, NOAA Atlas Series, 83 pp.

  • Delworth, T. L., S. Manabe, and R. Stouffer, 1993: Interdecadal variability of the thermohaline circulation in a coupled atmosphere–ocean model. J. Climate,6, 1993–2011.

  • Deser, C., and M. L. Blackmon, 1993: Surface climate variations over the North Atlantic Ocean during winter 1900–1989. J. Climate,6, 1743–1753.

  • Frankignoul, C., and K. Hasselmann, 1977: Stochastic climate models. Part II: Application to sea-surface temperature anomalies and thermocline variability. Tellus,29, 289–305.

  • ——, P. Müller, and E. Zorita, 1997: A simple model of the decadal response of the ocean to stochastic wind forcing. J. Phys. Oceanogr.,27, 1533–1546.

  • ——, A. Czaja, and B. L’Heveder, 1998: Air–sea feedback in the North Atlantic and surface boundary conditions for ocean models. J. Climate,11, 2310–2324.

  • Greatbatch, R. J., and A. Goulding, 1989: Seasonal variations in a linear barotropic model of the North Atlantic driven by a Hellerman and Rosenstein wind stress field. J. Phys. Oceanogr.,19, 572–595.

  • Griffies, S. M., and E. Tziperman, 1995: A linear thermohaline oscillator driven by stochastic atmospheric forcing. J. Climate,8, 2440–2453.

  • Grötzner, A., M. Latif, and T. P. Barnett, 1998: A decadal climate cycle in the North Atlantic Ocean as simulated by the ECHO coupled GCM. J. Climate,11, 831–847.

  • Häkkinen, S., 1993: An Arctic source for the Great Salinity Anomaly:A simulation of the Arctic ice ocean system for 1955–1975. J. Geophys. Res.,98, 16 397–16 410.

  • ——, 1999: Variability of the simulated meridional heat transport in the North Atlantic for the period 1951–1993. J. Geophys. Res.,104, 10 991–11 007.

  • ——, and G. L. Mellor, 1992: Modeling the seasonal variability of the coupled Arctic ice–ocean system. J. Geophys. Res.,97, 20 285–20 304.

  • ——, and C. A. Geiger, 2000: Simulated low frequency modes of circulation in the Arctic for the period 1951–1993. J. Geophys. Res., in press.

  • Hall, A., and S. Manabe, 1997: Can local linear stochastic theory explain sea surface temperature and salinity variability? Climate Dyn.,13, 167–180.

  • Halliwell, G. R., and D. A. Mayer, 1996: Frequency response properties of forced climatic SST anomaly variability in the North Atlantic. J. Climate,9, 3575–3587.

  • Hurrell, J. W., 1995: Decadal trends in the North Atlantic oscillation regional temperatures and precipitation. Science,269, 676–679.

  • Kushnir, Y., 1994: Interdecadal variations in North Atlantic sea surface temperature and associated atmospheric conditions. J. Climate,7, 141–157.

  • ——, and I. M. Held, 1996: Equilibrium atmospheric response to North Atlantic SST anomalies. J. Climate,9, 1208–1220.

  • Latif, M., 1998: Dynamics of interdecadal variability in coupled ocean–atmosphere models. J. Climate,11, 602–624.

  • ——, and T. P. Barnett, 1994: Causes of decadal variability over the North Pacific and North America. Science,266, 635–637.

  • Lau, N.-C., and M. J. Nath, 1994: A modeling study of the relative roles of tropical and extratropical SST anomalies in the variability of the global atmosphere–ocean system. J. Climate,7, 1184–1207.

  • Levitus, S., 1982: Climatological Atlas of the World Ocean. NOAA Prof. Paper 13, U.S. Government Printing Office, 173 pp.

  • Lin, S.-J., W. C. Chao, Y. C. Sud, and G. K. Walker, 1994: A class of van Leer-type transport schemes and its application to the moisture transport in a general circulation model. Mon. Wea. Rev.,122, 1575–1593.

  • Mann, M. E., and J. Park, 1994: Global-scale modes of surface temperature variability on interannual to century timescales. J. Geophys. Res.,99, 25 819–25 833.

  • Maul, G. A., and K. Hanson, 1991: Interannual coherence between North Atlantic atmospheric surface pressure and composite southern U.S.A. sea level. Geophys. Res. Lett.,18, 653–656.

  • Mauritzen, C., and S. Häkkinen, 1997: Influence of sea ice on the thermohaline circulation in the Arctic–North Atlantic Ocean. Geophys. Res. Lett.,24, 3257–3260.

  • Moron, V., R. Vautard, and M. Ghil, 1998: Trends, interdecadal and interannual oscillations in global sea-surface temperatures. Climate Dyn.,14, 545–569.

  • Neelin, D., D. S. Battisti, A. C. Hirst, F-F. Jin, Y. Wakata, T. Yamagata, and S. E. Zebiak, 1998: ENSO theory. J. Geophys. Res.,103, 14 261–14 290.

  • Palmer, T. N., and Z. Sun, 1985: A modeling and observational study of the relationship between sea surface temperature in the north-west Atlantic and the atmosheric general circulation. Quart. J. Roy. Meteor. Soc.,111, 947–975.

  • Peng, S., L. A. Mysak, H. Ritchie, J. Derome, and B. Bugas, 1995:The differences between early and midwinter responses to sea surface temperature anomalies in the north-west Atlantic. J. Climate,8, 137–157.

  • Rasmusson, E. M., and K. Mo, 1996: Large-scale atmospheric moisture cycling as evaluated from NMC global analysis and forecast products. J. Climate,9, 3276–3297.

  • Reverdin, G., D. Cayan, and Y. Kushnir, 1997: Decadal variability of hydrography in the upper northern Atlantic, 1948–1990. J. Geophys. Res.,102, 8505–8532.

  • Rodwell, M. J., D. P. Rowell, and C. K. Folland, 1999: Oceanic forcing of the wintertime North Atlantic oscillation and European climate. Nature,398, 320–323.

  • Rogers, J. C., 1984: The association between the North Atlantic oscillation and the Southern Oscillation in the Northern Hemisphere. Mon. Wea. Rev.,112, 1999–2015.

  • Russell, G. L., and J. R. Miller, 1990: Global river runoff calculated from a global atmospheric general circulation model. J. Hydrol.,117, 241–254.

  • Saravanan, R., and J. C. McWilliams, 1997: Stochasticity and spatial resonance in interdecadal climate fluctuations. J. Climate,10, 2299–2320.

  • ——, and ——, 1998: Adjective ocean–atmosphere interactions: An analytical stochastic model with implications for decadal variability. J. Climate,11, 165–188.

  • Smith, T. M., R. E. Livezey, and S. S. Shen, 1998: An improved method for analyzing sparse and irregularly distributed SST data on a regular grid: Tropical Pacific Ocean. J. Climate,11, 1717–1729.

  • Sturges, W., 1987: Large-scale coherence of sea level at very low frequencies. J. Phys. Oceanogr.,17, 2084–2094.

  • Suarez, M. J., and P. S. Schopf, 1988: A delayed action oscillator for ENSO. J. Atmos. Sci.,45, 3283–3287.

  • Sutton, R. T., and M. R. Allen, 1997: Decadal predictability of North Atlantic sea surface temperature and climate. Nature,388, 563–567.

  • Timmermann, A., M. Latif, R. Voss, and A. Grötzner, 1998: Northern Hemisphere interdecadal variability: A coupled air–sea mode. J. Climate,11, 1906–1931.

  • Trenberth, K., J. G. Olson, and W. G. Large, 1989: A global ocean wind stress climatology based on ECMWF analyses. NCAR Tech. Note, NCAR/TN-338+STR, 93 pp.

  • Unal, Y. S., and M. Ghil, 1995: Interannual and inerdecadal oscillation patterns in sea level. Climate Dyn.,11, 255–278.

  • Vautard, R., P. Yiou, and M. Ghil, 1992: Singular spectrum analysis:A toolkit for short, noisy chaotic signals. Physica D,58, 95–126.

  • Wajsowicz, R., 1986: Adjustment of the ocean under buoyancy forces. Part II: The role of planetary waves. J. Phys. Oceanogr.,16, 2115–2136.

  • Wallace, J. M., and D. S. Gutzler, 1981: Teleconnections in the geopotential height field during Northern Hemisphere winter. Mon. Wea. Rev.,109, 784–812.

  • ——, and Q. Jiang, 1987: On the observed structure of the interannual variability of the atmosphere–ocean climate system. Atmosphere and Oceanic Variability, H. Cattle, Ed., Roy. Meteor. Soc., 17–43.

  • Weaver, A. J., and E. S. Sarachik, 1991: Evidence for decadal variability in an ocean general circulation model: An advective mechanism. Atmos.–Ocean,29, 197–231.

  • Winton, M., 1997: The damping effect of bottom topography on internal decadal-scale oscillations of the thermohaline circulation. J. Phys. Oceanogr.,27, 203–208.

  • Yang, J., 1999: A linkage between decadal climate variations in the Labrador Sea and the tropical Atlantic Ocean. Geophys. Res. Lett.,26, 1023–1026.

  • Zorita, E., and C. Frankignoul, 1997: Modes of North Atlantic decadal variability in the ECHAM/LSG coupled ocean–atmosphere model. J. Climate,10, 183–200.

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