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Article Type:
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The Role of Coupled Sea Surface Temperatures in the Simulation of the Tropical Intraseasonal Oscillation

Y. Zheng Marine Sciences Research Center, State University of New York at Stony Brook, Stony Brook, New York

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D. E. Waliser Marine Sciences Research Center, State University of New York at Stony Brook, Stony Brook, New York

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W. F. Stern Geophysical Fluid Dynamics Laboratory, Princeton University, Princeton, New Jersey

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C. Jones Institute for Computational Earth System Science, University of California, Santa Barbara, Santa Barbara, California

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Print Publication:
01 Nov 2004
DOI:
https://doi.org/10.1175/JCLI3202.1
Page(s):
4109–4134
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Abstract

This study compares the tropical intraseasonal oscillation (TISO) variability in the Geophysical Fluid Dynamics Laboratory (GFDL) coupled general circulation model (CGCM) and the stand-alone atmospheric general circulation model (AGCM). For the AGCM simulation, the sea surface temperatures (SSTs) were specified using those from the CGCM simulation. This was done so that any differences in the TISO that emerged from the two simulations could be attributed to the coupling process and not to a difference in the mean background state. The comparison focused on analysis of the rainfall, 200-mb velocity potential, and 850-mb zonal wind data from the two simulations, for both summer and winter periods, and included comparisons to analogous diagnostics using NCEP–NCAR reanalysis and Climate Prediction Center (CPC) Merged Analysis of Precipitation (CMAP) rainfall data.

The results of the analysis showed three principal differences in the TISO variability between the coupled and uncoupled simulations. The first was that the CGCM showed an improvement in the spatial variability associated with the TISO mode, particularly for boreal summer. Specifically, the AGCM exhibited almost no TISO variability in the Indian Ocean during boreal summer—a common shortcoming among AGCMs. The CGCM, on the other hand, did show a considerable enhancement in TISO variability in this region for this season. The second was that the wavenumber–frequency spectra of the AGCM exhibited an unrealistic peak in variability at low wavenumbers (1–3, depending on the variable) and about 3 cycles yr−1 (cpy). This unrealistic peak of variability was absent in the CGCM, which otherwise tended to show good agreement with the observations. The third difference was that the AGCM showed a less realistic phase lag between the TISO-related convection and SST anomalies. In particular, the CGCM exhibited a near-quadrature relation between precipitation and SST anomalies, which is consistent with observations, while the phase lag was reduced in the AGCM by about 1.5 pentads (∼1 week). The implications of the above results, including those for the notions of “perfect SST” and “two tier” experiments, are discussed, as are the caveats associated with the study's modeling framework and analysis.

Corresponding author address: Dr. Duane E. Waliser, Jet Propulsion Laboratory, MS 183-505, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109. Email: duane.waliser@jpl.nasa.gov

Abstract

This study compares the tropical intraseasonal oscillation (TISO) variability in the Geophysical Fluid Dynamics Laboratory (GFDL) coupled general circulation model (CGCM) and the stand-alone atmospheric general circulation model (AGCM). For the AGCM simulation, the sea surface temperatures (SSTs) were specified using those from the CGCM simulation. This was done so that any differences in the TISO that emerged from the two simulations could be attributed to the coupling process and not to a difference in the mean background state. The comparison focused on analysis of the rainfall, 200-mb velocity potential, and 850-mb zonal wind data from the two simulations, for both summer and winter periods, and included comparisons to analogous diagnostics using NCEP–NCAR reanalysis and Climate Prediction Center (CPC) Merged Analysis of Precipitation (CMAP) rainfall data.

The results of the analysis showed three principal differences in the TISO variability between the coupled and uncoupled simulations. The first was that the CGCM showed an improvement in the spatial variability associated with the TISO mode, particularly for boreal summer. Specifically, the AGCM exhibited almost no TISO variability in the Indian Ocean during boreal summer—a common shortcoming among AGCMs. The CGCM, on the other hand, did show a considerable enhancement in TISO variability in this region for this season. The second was that the wavenumber–frequency spectra of the AGCM exhibited an unrealistic peak in variability at low wavenumbers (1–3, depending on the variable) and about 3 cycles yr−1 (cpy). This unrealistic peak of variability was absent in the CGCM, which otherwise tended to show good agreement with the observations. The third difference was that the AGCM showed a less realistic phase lag between the TISO-related convection and SST anomalies. In particular, the CGCM exhibited a near-quadrature relation between precipitation and SST anomalies, which is consistent with observations, while the phase lag was reduced in the AGCM by about 1.5 pentads (∼1 week). The implications of the above results, including those for the notions of “perfect SST” and “two tier” experiments, are discussed, as are the caveats associated with the study's modeling framework and analysis.

Corresponding author address: Dr. Duane E. Waliser, Jet Propulsion Laboratory, MS 183-505, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109. Email: duane.waliser@jpl.nasa.gov

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  • Annamalai, H., and J. M. Slingo, 2001: Active/break cycles: Diagnosis of the intraseasonal variability of the Asian Summer Monsoon. Climate Dyn, 18 , 85–102.

    • Search Google Scholar
    • Export Citation

  • Chang, C. P., and H. Lim, 1988: Kelvin wave-CISK: A possible mechanism for the 30–50 day oscillations. J. Atmos. Sci, 45 , 1709–1720.

    • Search Google Scholar
    • Export Citation

  • Chou, S-H., C-L. Shie, R. M. Atlas, and J. Ardizzone, 1995: The December 1992 westerly wind burst and its impact on evaporation determined from SSMI data. Proc. Int. Scientific Conf. on the Tropical Ocean Global Atmosphere Program, Melbourne, Australia, World Meteorological Organization, 489–493.

    • Search Google Scholar
    • Export Citation

  • Duchon, C. E., 1979: Lanczos filter in one and two dimensions. J. Appl. Meteor, 18 , 1016–1022.

  • Emanuel, K. A., 1987: An air–sea interaction model of intraseasonal oscillations in the Tropics. J. Atmos. Sci, 44 , 2324–2340.

  • Fasullo, J., and P. Webster, 1995: Aspects of ocean/atmosphere interaction during westerly wind bursts. Proc. Int. Scientific Conf. on the Tropical Ocean Global Atmosphere Program, Melbourne, Australia, World Meteorological Organization, 39–43.

    • Search Google Scholar
    • Export Citation

  • Ferranti, L., T. N. Palmer, F. Molteni, and K. Klinker, 1990: Tropical– extratropical interaction associated with the 30–60-day oscillation and its impact on medium and extended range prediction. J. Atmos. Sci, 47 , 2177–2199.

    • Search Google Scholar
    • Export Citation

  • Flatau, M., P. J. Flatau, P. Phoebus, and P. P. Niiler, 1997: The feedback between equatorial convection and local radiative and evaporative processes: The implications for intraseasonal oscillations. J. Atmos. Sci, 54 , 2373–2386.

    • Search Google Scholar
    • Export Citation

  • Fu, X., and B. Wang, 2004: Differences of boreal summer intraseasonal oscillations simulated in an atmosphere–ocean coupled model and an atmosphere-only model. J. Climate, 17 , 1263–1271.

    • Search Google Scholar
    • Export Citation

  • Fu, X., B. Wang, T. Li, and J. McCreary, 2003: Coupling between northward-propagating, intraseasonal oscillations and sea surface temperature in the Indian Ocean. J. Atmos. Sci, 60 , 1733–1753.

    • Search Google Scholar
    • Export Citation

  • Goddard, L., S. J. Mason, S. E. Zebiak, C. F. Ropelewski, R. Basher, and M. A. Cane, 2001: Current approaches to seasonal-to-interannual climate predictions. Int. J. Climatol, 21 , 1111–1152.

    • Search Google Scholar
    • Export Citation

  • Hendon, H. H., 1988: A simple model of the 40–50 day oscillation. J. Atmos. Sci, 45 , 569–584.

  • Hendon, H. H., 2000: Impact of air–sea coupling on the Madden–Julian oscillation in a general circulation model. J. Atmos. Sci, 57 , 3939–3952.

    • Search Google Scholar
    • Export Citation

  • Hendon, H. H., and B. Liebmann, 1990a: A composite study of onset of the Australian summer monsoon. J. Atmos. Sci, 47 , 2227–2240.

  • Hendon, H. H., and B. Liebmann, 1990b: The intraseasonal (30–50 day) oscillation of the Australian summer monsoon. J. Atmos. Sci, 47 , 2909–2923.

    • Search Google Scholar
    • Export Citation

  • Hendon, H. H., and M. L. Salby, 1994: The life cycle of the Madden–Julian oscillation. J. Atmos. Sci, 51 , 2225–2237.

  • Hendon, H. H., and J. Glick, 1997: Intraseasonal air–sea interaction in the tropical Indian and Pacific Oceans. J. Climate, 10 , 647–661.

    • Search Google Scholar
    • Export Citation

  • Hendon, H. H., B. Liebmann, and J. D. Glick, 1998: Oceanic Kelvin waves and the Madden–Julian oscillation. J. Atmos. Sci, 55 , 88–101.

    • Search Google Scholar
    • Export Citation

  • Hendon, H. H., B. Liebmann, M. Newman, J. D. Glick, and J. E. Schemm, 2000: Medium-range forecast errors associated with active episodes of the Madden–Julian oscillation. Mon. Wea. Rev, 128 , 69–86.

    • Search Google Scholar
    • Export Citation

  • Higgins, R. W., and S. D. Schubert, 1996: Simulations of persistent North Pacific circulation anomalies and interhemispheric teleconnections. J. Atmos. Sci, 53 , 188–207.

    • Search Google Scholar
    • Export Citation

  • Higgins, R. W., and K. C. Mo, 1997: Persistent North Pacific circulation anomalies and the tropical intraseasonal oscillation. J. Climate, 10 , 223–244.

    • Search Google Scholar
    • Export Citation

  • Higgins, R. W., and W. Shi, 2001: Intercomparison of the principal modes of interannual and intraseasonal variability of the North American monsoon system. J. Climate, 14 , 403–417.

    • Search Google Scholar
    • Export Citation

  • Higgins, R. W., J. K. E. Schemm, W. Shi, and A. Leetmaa, 2000: Extreme precipitation events in the western United States related to tropical forcing. J. Climate, 13 , 793–820.

    • Search Google Scholar
    • Export Citation

  • Inness, P. M., and J. M. Slingo, 2003: Simulation of the Madden– Julian oscillation in a coupled general circulation model. Part I: Comparison with observations and an atmosphere-only GCM. J. Climate, 16 , 345–364.

    • Search Google Scholar
    • Export Citation

  • Inness, P. M., J. M. Slingo, E. Guilyardi, and J. Cole, 2003: Simulation of the Madden–Julian oscillation in a coupled general circulation model. Part II: The role of the basic state. J. Climate, 16 , 365–382.

    • Search Google Scholar
    • Export Citation

  • Johnson, R. H., 1995: Variability of clouds and precipitation during TOGA COARE. Proc. Int. Scientific Conf. on the Tropical Ocean Global Atmosphere Program, Melbourne, Australia, World Meteorological Organization, 552–556.

    • Search Google Scholar
    • Export Citation

  • Jones, C., 2000: Occurrence of extreme precipitation events in California and relationships with the Madden–Julian oscillation. J. Climate, 13 , 3576–3587.

    • Search Google Scholar
    • Export Citation

  • Jones, C., and B. C. Weare, 1996: The role of low-level moisture convergence and ocean latent heat fluxes in the Madden and Julian oscillation: An observational analysis using ISCCP data and ECMWF analyses. J. Climate, 9 , 3086–3104.

    • Search Google Scholar
    • Export Citation

  • Jones, C., and J. K. E. Schemm, 2000: The influence of intraseasonal variations on medium- to extended-range weather forecasts over South America. Mon. Wea. Rev, 128 , 486–494.

    • Search Google Scholar
    • Export Citation

  • Jones, C., D. E. Waliser, and C. Gautier, 1998: The influence of the Madden–Julian oscillation on ocean surface heat fluxes and sea surface temperatures. J. Climate, 11 , 1057–1072.

    • Search Google Scholar
    • Export Citation

  • Jones, C., D. E. Waliser, J. K. E. Schemm, and W. K. M. Lau, 2000: Prediction skill of the Madden and Julian Oscillation in dynamical extended range forecasts. Climate Dyn, 16 , 273–289.

    • Search Google Scholar
    • Export Citation

  • Jones, C., L. M. V. Carvalho, W. Higgins, D. Waliser, and J-K. Schemm, 2004: Climatology of tropical intraseasonal convective anomalies: 1979–2002. J. Climate, 17 , 523–539.

    • Search Google Scholar
    • Export Citation

  • Kalnay, E., and Coauthors, 1996: The NCEP/NCAR 40-Year Reanalysis Project. Bull. Amer. Meteor. Soc, 77 , 437–471.

  • Kang, I-S., and Coauthors, 2002: Intercomparison of the climatological variations of Asian summer monsoon precipitation simulated by 10 GCMs. Climate Dyn, 19 , 383–395.

    • Search Google Scholar
    • Export Citation

  • Kawamura, R., 1988: Intraseasonal variability of sea surface temperatures over the tropical western Pacific. J. Meteor. Soc. Japan, 66 , 1007–1012.

    • Search Google Scholar
    • Export Citation

  • Kawamura, R., 1991: Air–sea coupled modes on intraseasonal and interannual time scales over the tropical western Pacific. J. Geophys. Res, 96 , 3165–3172.

    • Search Google Scholar
    • Export Citation

  • Kemball-Cook, S., and B. Wang, 2001: Equatorial waves and air–sea interaction in the boreal summer intraseasonal oscillations. J. Climate, 14 , 2923–2942.

    • Search Google Scholar
    • Export Citation

  • Kemball-Cook, S., B. Wang, and X. Fu, 2002: Simulation of the ISO in the ECHAM-4 model: The impact of coupling with an ocean model. J. Atmos. Sci, 59 , 1433–1453.

    • Search Google Scholar
    • Export Citation

  • Kessler, W. S., and R. Kleeman, 2000: Rectification of the Madden– Julian oscillation into the ENSO cycle. J. Climate, 13 , 3560–3575.

    • Search Google Scholar
    • Export Citation

  • Kessler, W. S., M. J. McPhaden, and K. M. Weickmann, 1995: Forcing of intraseasonal Kelvin waves in the equatorial Pacific. J. Geophys. Res, 100 (C3) 4893–4920.

    • Search Google Scholar
    • Export Citation

  • Krishnamurti, T. N., and P. Ardunay, 1980: The 10 to 20 day westward propagating mode and “breaks in the monsoons.”. Tellus, 32 , 15–26.

    • Search Google Scholar
    • Export Citation

  • Krishnamurti, T. N., D. K. Oosterhof, and A. V. Metha, 1988: Air–sea interaction on the timescale of 30 to 50 days. J. Atmos. Sci, 45 , 1304–1322.

    • Search Google Scholar
    • Export Citation

  • Lau, K-M., and P. H. Chan, 1986a: The 40–50 day oscillation and the El Niño/Southern Oscillation—A new perspective. Bull. Amer. Meteor. Soc, 67 , 533–534.

    • Search Google Scholar
    • Export Citation

  • Lau, K-M., and P. H. Chan, 1986b: Aspects of the 40–50 day oscillation during the northern summer as inferred from outgoing longwave radiation. Mon. Wea. Rev, 114 , 1354–1367.

    • Search Google Scholar
    • Export Citation

  • Lau, K-M., and T. J. Phillips, 1986: Coherent fluctuations of extratropical geopotential height and tropical convection in intraseasonal timescales. J. Atmos. Sci, 43 , 1164–1181.

    • Search Google Scholar
    • Export Citation

  • Lau, K-M., and L. Peng, 1987: Origin of low-frequency (intraseasonal) oscillations in the tropical atmosphere. Part I: Basic theory. J. Atmos. Sci, 44 , 950–972.

    • Search Google Scholar
    • Export Citation

  • Lau, K-M., and C. H. Sui, 1997: Mechanisms of short-term sea surface temperature regulation: Observations during TOGA COARE. J. Climate, 10 , 465–472.

    • Search Google Scholar
    • Export Citation

  • Li, T. M., and B. Wang, 1994: The influence of sea surface temperature on the tropical intraseasonal oscillation: A numerical study. Mon. Wea. Rev, 122 , 2349–2362.

    • Search Google Scholar
    • Export Citation

  • Liebmann, B., and D. L. Hartmann, 1984: An observational study of tropical–midlatitude interaction on intraseasonal timescales during winter. J. Atmos. Sci, 41 , 3333–3350.

    • Search Google Scholar
    • Export Citation

  • Madden, R. A., and P. R. Julian, 1971: Detection of a 40–50 day oscillation in the zonal wind in the tropical Pacific. J. Atmos. Sci, 28 , 702–708.

    • Search Google Scholar
    • Export Citation

  • Madden, R. A., and P. R. Julian, 1994: Observations of the 40–50-day tropical oscillation—A review. Mon. Wea. Rev, 122 , 814–837.

  • Maloney, E. D., and D. L. Hartmann, 2000a: Modulation of eastern North Pacific hurricanes by the Madden–Julian oscillation. J. Climate, 13 , 1451–1460.

    • Search Google Scholar
    • Export Citation

  • Maloney, E. D., and D. L. Hartmann, 2000b: Modulation of hurricane activity in the Gulf of Mexico by the Madden–Julian oscillation. Science, 287 , 2002–2004.

    • Search Google Scholar
    • Export Citation

  • Maloney, E. D., and J. T. Kiehl, 2002: Intraseasonal eastern Pacific precipitation and SST variations in a GCM coupled to a slab ocean model. J. Climate, 15 , 2989–3007.

    • Search Google Scholar
    • Export Citation

  • McPhaden, M. J., 1999: El Niño—The child prodigy of 1997–98. Nature, 398 , 559–562.

  • McPhaden, M. J., and B. A. Taft, 1988: Dynamics of seasonal and intraseasonal variability in the eastern equatorial Pacific. J. Phys. Oceanogr, 18 , 1713–1732.

    • Search Google Scholar
    • Export Citation

  • McPhaden, M. J., H. P. Freitag, S. P. Hayes, B. A. Taft, Z. Chien, and K. Wyrtki, 1988: The response of the equatorial Pacific Ocean to a westerly wind burst in May 1986. J. Geophys. Res, 93 (C9) 10589–10603.

    • Search Google Scholar
    • Export Citation

  • Mo, K. C., 2000: Intraseasonal modulation of summer precipitation over North America. Mon. Wea. Rev, 128 , 1490–1505.

  • Mo, K. C., and R. W. Higgins, 1998a: The Pacific–South American modes and tropical convection during the Southern Hemisphere winter. Mon. Wea. Rev, 126 , 1581–1596.

    • Search Google Scholar
    • Export Citation

  • Mo, K. C., and R. W. Higgins, 1998b: Tropical convection and precipitation regimes in the western United States. J. Climate, 11 , 2404–2423.

    • Search Google Scholar
    • Export Citation

  • Mo, K. C., and R. W. Higgins, 1998c: Tropical influences on California precipitation. J. Climate, 11 , 412–430.

  • Nakazawa, T., 1995: Intraseasonal oscillations during the TOGA COARE IOP. J. Meteor. Soc. Japan, 73 , 305–319.

  • Neelin, J. D., I. M. Held, and K. H. Cook, 1987: Evaporation–wind feedback and low-frequency variability in the tropical atmosphere. J. Atmos. Sci, 44 , 2341–2348.

    • Search Google Scholar
    • Export Citation

  • Nogués-Paegle, J., and K. C. Mo, 1997: Alternating wet and dry conditions over South America during summer. Mon. Wea. Rev, 125 , 279–291.

    • Search Google Scholar
    • Export Citation

  • Pacanowski, R. C., 1995: MOM 2 documentation, user's guide and reference manual. GFDL Ocean Group Tech. Rep. 3, 232 pp.

  • Paegle, J. N., L. A. Byerle, and K. C. Mo, 2000: Intraseasonal modulation of South America summer precipitation. Mon. Wea. Rev, 128 , 837–850.

    • Search Google Scholar
    • Export Citation

  • Sengupta, D., and M. Ravichandran, 2001: Oscillations of Bay of Bengal sea surface temperature during the 1998 summer monsoon. Geophys. Res. Lett, 28 , 2033–2036.

    • Search Google Scholar
    • Export Citation

  • Sengupta, D., B. N. Goswami, and R. Senan, 2001: Coherent intraseasonal oscillations of ocean and atmosphere during the Asian summer monsoon. Geophys. Res. Lett, 28 , 4127–4130.

    • Search Google Scholar
    • Export Citation

  • Shinoda, T., and H. H. Hendon, 1998: Mixed layer modeling of intraseasonal variability in the tropical western Pacific and Indian Oceans. J. Climate, 11 , 2668–2685.

    • Search Google Scholar
    • Export Citation

  • Shinoda, T., H. H. Hendon, and J. Glick, 1998: Intraseasonal variability of surface fluxes and sea surface temperature in the tropical western Pacific and Indian Oceans. J. Climate, 11 , 1685–1702.

    • Search Google Scholar
    • Export Citation

  • Sikka, D. R., and S. Gadgil, 1980: On the maximum cloud zone and the ITCZ over Indian longitudes during the southwest monsoon. Mon. Wea. Rev, 108 , 1840–1853.

    • Search Google Scholar
    • Export Citation

  • Slingo, J. M., and Coauthors, 1996: Intraseasonal oscillations in 15 atmospheric general circulation models: Results from an AMIP diagnostic subproject. Climate Dyn, 12 , 325–357.

    • Search Google Scholar
    • Export Citation

  • Sobel, A. H., and H. Gildor, 2003: A simple time-dependent model of SST hot spots. J. Climate, 16 , 3978–3992.

  • Sperber, K. R., J. M. Slingo, P. M. Inness, and K. M. Lau, 1997: On the maintenance and initiation of the intraseasonal oscillation in the NCEP/NCAR reanalysis and the GLA and UKMO AMIP simulations. Climate Dyn, 13 , 769–795.

    • Search Google Scholar
    • Export Citation

  • Stern, W., and K. Miyakoda, 1995: Feasibility of seasonal forecasts inferred from multiple GCM simulations. J. Climate, 8 , 1071–1085.

  • Vecchi, G. A., and D. E. Harrison, 2000: Tropical Pacific sea surface temperature anomalies, El Niño, and equatorial westerly wind events. J. Climate, 13 , 1814–1830.

    • Search Google Scholar
    • Export Citation

  • Waliser, D. E., 1996: Formation and limiting mechanism for very high sea surface temperature: Linking the dynamics and thermodynamics. J. Climate, 9 , 161–188.

    • Search Google Scholar
    • Export Citation

  • Waliser, D. E., C. Jones, J. K. E. Schemm, and N. E. Graham, 1999a: A statistical extended-range tropical forecast model based on the slow evolution of the Madden–Julian oscillation. J. Climate, 12 , 1918–1939.

    • Search Google Scholar
    • Export Citation

  • Waliser, D. E., K-M. Lau, and J-H. Kim, 1999b: The influence of coupled sea surface temperatures on the Madden–Julian oscillation: A model perturbation experiment. J. Atmos. Sci, 56 , 333–358.

    • Search Google Scholar
    • Export Citation

  • Waliser, D. E., and Coauthors, 2003a: AGCM simulations of intraseasonal variability associated with the Asian summer monsoon. Climate Dyn, 21 , 423–446.

    • Search Google Scholar
    • Export Citation

  • Waliser, D. E., K. M. Lau, W. Stern, and C. Jones, 2003b: Potential predictability of the Madden–Julian oscillation. Bull. Amer. Meteor. Soc, 84 , 33–50.

    • Search Google Scholar
    • Export Citation

  • Waliser, D. E., S. Schubert, A. Kumar, K. Weickmann, and R. Dole, 2003c: Proc. Workshop on Modeling, Simulation and Forecasting of Subseasonal Variability, College Park, MD, NASA, NASA/TM 2003-104606, Vol. 25, 67 pp.

  • Waliser, D. E., W. Stern, S. Schubert, and K. M. Lau, 2003d: Dynamic predictability of intraseasonal variability associated with the Asian summer monsoon. Quart. J. Roy. Meteor. Soc, 129 , 2897–2925.

    • Search Google Scholar
    • Export Citation

  • Wang, B., and H. Rui, 1990: Synoptic climatology and transient tropical intraseasonal convection anomalies—1978–1985. Meteor. Atmos. Phys, 44 , 43–61.

    • Search Google Scholar
    • Export Citation

  • Wang, B., and X. Xie, 1998: Coupled modes of the warm pool climate system. Part I: The role of air–sea interaction in maintaining Madden–Julian oscillation. J. Climate, 11 , 2116–2135.

    • Search Google Scholar
    • Export Citation

  • Wang, W., S. Saha, and H-L. Pan, 2004: Simulation and prediction of the MJO with the NCEP models. Proc. ECMWF/CLIVAR Workshop on Simulation and Prediction of Intra-Seasonal Variability with Emphasis on the MJO, Reading, United Kingdom, ECMWF, 14.

    • Search Google Scholar
    • Export Citation

  • Watterson, I. G., 2002: The sensitivity of subannual and intraseasonal tropical variability to model ocean mixed layer depth. J. Geophys. Res.,107A, 4020, doi:10.1029/2001JD000671.

    • Search Google Scholar
    • Export Citation

  • Webster, P. J., and R. Lukas, 1992: TOGA COARE: The Coupled Ocean–Atmosphere Response Experiment. Bull. Amer. Meteor. Soc, 73 , 1377–1416.

    • Search Google Scholar
    • Export Citation

  • Weickmann, K. M., 1983: Intraseasonal circulation and outgoing longwave radiation modes during Northern Hemisphere winter. Mon. Wea. Rev, 111 , 1838–1858.

    • Search Google Scholar
    • Export Citation

  • Weickmann, K. M., 1991: El Niño/Southern Oscillation and Madden–Julian (30– 60 day) oscillations during 1981–1982. J. Geophys. Res, 96C , 3187–3195.

    • Search Google Scholar
    • Export Citation

  • Weickmann, K. M., G. R. Lussky, and J. E. Kutzbach, 1985: Intraseasonal (30–60 day) fluctuations of outgoing longwave radiation and 250 mb streamfunction during northern winter. Mon. Wea. Rev, 113 , 941–961.

    • Search Google Scholar
    • Export Citation

  • Woolnough, S. J., J. M. Slingo, and B. J. Hoskins, 2000: The relationship between convection and sea surface temperature on intraseasonal timescales. J. Climate, 13 , 2086–2104.

    • Search Google Scholar
    • Export Citation

  • Wu, M. L. C., S. Schubert, I. S. Kang, and D. E. Waliser, 2002: Forced and free intraseasonal variability over the South Asian monsoon region simulated by 10 AGCMs. J. Climate, 15 , 2862–2880.

    • Search Google Scholar
    • Export Citation

  • Xie, P., and P. A. Arkin, 1997: Global precipitation: A 17-year monthly analysis based on gauge observations, satellite estimates, and numerical model outputs. Bull. Amer. Meteor. Soc, 78 , 2539–2558.

    • Search Google Scholar
    • Export Citation

  • Yasunari, T., 1980: A quasi-stationary appearance of the 30–40 day period in the cloudiness fluctuations during the summer monsoon over India. J. Meteor. Soc. Japan, 58 , 336–354.

    • Search Google Scholar
    • Export Citation

  • Zhang, C., 1996: Atmospheric intraseasonal variability at the surface in the tropical western Pacific Ocean. J. Atmos. Sci, 53 , 739–758.

    • Search Google Scholar
    • Export Citation
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