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Surface heat budget and heat balance in the oceanic mixed layer in the central equatorial Pacific ocean during the 1986–87 El Niño

  • Kunio Kutsuwada
Article

Abstract

In January–February 1987, an urgent cruise “JENEX-87” was carried out in the central equatorial Pacific during the occurrence of the 1986–87 El Niño. This cruise, supported by the Japan Science and Technology Agency, supplied heat flux data through the sea surface, on the basis of direct measurements of short- and long-wave radiation fluxes.

In the time average, the heat gain due to the radiation flux (153 W m−2) was almost compensated by the heat loss due to latent heat flux (130 W m−2), and thus the net heat gain was small in magnitude (20 W m−2). On the other hand, day-to-day changes of the net heat flux ranged within ±130 W m−2, mainly reflecting the downward short-wave radiation variations.

The heat balance in the surface oceanic mixed layer was investigated in two quadrangle areas (160°E-180° and 180°-160°W between 2°N and 2°S), using the surface heat flux and estimating the advective heat fluxes due to the geostrophic and Ekman currents. In these two quadrangles, we respectively derived −187±88 W m−2 and +27±95 W m−2. The former value, which is equivalent to about 1°C month−1 drop of the mixed layer temperature, is evidence of the abnormal oceanic condition in the occurrence of the 1986–87 El Niño event.

Keywords

Heat Flux Latent Heat Flux Surface Heat Flux Heat Gain Oceanic Mixed Layer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Behringer, D.W. and H. Stommel (1981): Annual heat gain of the tropical Atlantic computed from subsurface ocean data. J. Phys. Oceanogr.,11, 1393–1398.CrossRefGoogle Scholar
  2. Blanc, T.V. (1987): Accuracy of bulk-method-determined flux, stability, and sea surface roughness. J. Geophys. Res.,92, 3867–3876.Google Scholar
  3. Bryden, H.L. and E.C. Brady (1985): Diagnostic model of the three dimensional circulation in the upper equatorial Pacific Ocean. J. Phys. Oceanogr.,15, 1255–1273.CrossRefGoogle Scholar
  4. Cane, M.A. (1983): Oceanographic events during El Niño. Science,222, 1189–1194.Google Scholar
  5. Climate Analysis Center (1986–1987): Climate Diagnostics Bulletin (monthly). Climate Analysis Center/NMC, National Weather Service, NOAA, Washington, D.C.Google Scholar
  6. Delcroix, T. (1987): Net heat gain of the tropical Pacific Ocean computed from subsurface ocean data and wind stress data. Deep-Sea Res.,34, 33–43.CrossRefGoogle Scholar
  7. Delcroix, T. and C. Henin (1988): Observations of the Equatorial Intermediate Current in the Western Pacific Ocean (165°E). J. Phys. Oceanogr.,18, 363–366.CrossRefGoogle Scholar
  8. Delcroix, T., G. Eldin and C. Henin (1987): Upper ocean water masses and transports in the western tropical Pacific (165°E). J. Phys. Oceanogr.,17, 2248–2262.CrossRefGoogle Scholar
  9. Enfield, D.B. (1986): Zonal and seasonal variations of the near-surface heat balance of the equatorial Pacific Ocean. J. Phys. Oceanogr.,16, 1038–1055.CrossRefGoogle Scholar
  10. Garratt, J. (1977): Review of drag coefficients over oceans and continents. Mon. Wea. Rev.,105, 915–929.CrossRefGoogle Scholar
  11. Hansen, D.V. and C.A. Paul (1984): Genesis and effects of long waves in the equatorial Pacific. J. Geophys. Res.,89, 10431–10440.Google Scholar
  12. Hayes, S.P. (1982): A comparison of geostrophic and measured velocities in the Equatorial Undercurrent. J. Mar. Res.,40 (Suppl.), 219–229.Google Scholar
  13. Hsiung, J. (1986): Mean surface energy fluxes over the global ocean. J. Geophys. Res.,91, 10585–10606.Google Scholar
  14. Japan Meteorological Agency (1986–1987): The Ten Day Marine Report, Marine Department, Japan Meteorological Agency, Tokyo.Google Scholar
  15. Johnson, E.S., L.A. Regier and R.A. Knox (1988): A study of geostrophy in tropical Pacific Ocean currents during the NORPAX Tahiti Shuttle using a shipboard Doppler Acoustic Current Profiler. J. Phys. Oceanogr.,18, 708–723.CrossRefGoogle Scholar
  16. Kondo, J. (1975): Air-sea bulk transfer coefficients in diabatic conditions. Boundary-Layer Meteor.,9, 91–112.Google Scholar
  17. Lukas, R. and E. Firing (1984): The geostrophic balance of the Pacific Equatorial Undercurrent. Deep-Sea Res.,31, 61–66.CrossRefGoogle Scholar
  18. Moum, J.N., T.K. Chereskin, M.M. Park and L.A. Regier (1987): Monitoring geostrophic currents at the equator. Deep-Sea Res.,34, 1149–1161.CrossRefGoogle Scholar
  19. Niiler, P. and J. Stevenson (1982): The heat budget of tropical warm-water pools. J. Mar. Res.,40 (Suppl.), 465–480.Google Scholar
  20. Otobe, H. and T. Asai (1985): Heat balance of the upper ocean under a land and sea breeze in Sagami Bay in summer. J. Oceanogr. Soc. Japan,41, 299–306.Google Scholar
  21. Payne, R.E. (1972): Albedo of the sea surface. J. Atmos. Sci.,28, 959–970.CrossRefGoogle Scholar
  22. Rasmusson, E. and J.M. Wallace (1983): Meteorological aspects of the El Niño-Southern Oscillation. Science,222, 1195–1202.Google Scholar
  23. Reed, R.K. (1985): An estimate of the climatological heat fluxes over the tropical Pacific Ocean. J. Climate Appl. Met.,24, 833–840.CrossRefGoogle Scholar
  24. Reed, R.K. (1986): Effects of surface heat flux during the 1972 and 1982 El Niño episodes. Nature,322, 449–450.CrossRefGoogle Scholar
  25. Stevenson, J. and P. Niiler (1983): Upper ocean heat budget during the Hawaii-to-Tahiti Shuttle Experiment. J. Phys. Oceanogr.,13, 1894–1907.CrossRefGoogle Scholar
  26. Weare, B.C., P.T. Strub and M.D. Samuel (1981): Annual mean surface heat fluxes in the tropical Pacific Ocean. J. Phys. Oceanogr.,11, 705–717.CrossRefGoogle Scholar
  27. Wyrtki, K. (1965): The average annual heat balance of the North Pacific Ocean and its relation to ocean circulation. J. Geophys. Res.,70, 4547–4559.Google Scholar
  28. Wyrtki, K. (1981): An estimate of equatorial upwelling in the Pacific. J. Phys. Oceanogr.,11, 1205–1214.CrossRefGoogle Scholar
  29. Wyrtki, K. and B. Kilonsky (1984): Mean water and current structure during the Hawaii-to-Tahiti Shuttle Experiment. J. Phys. Oceanogr.,14, 242–254.CrossRefGoogle Scholar

Copyright information

© Oceanographical Society of Japan 1989

Authors and Affiliations

  • Kunio Kutsuwada
    • 1
  1. 1.Otsuchi Marine Research Center, Ocean Research InstituteUniversity of TokyoIwateJapan

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