The Boreal-Summer Intraseasonal Oscillations Simulated in a Hybrid Coupled Atmosphere–Ocean Model*

Abstract The boreal-summer intraseasonal oscillation (BSISO) simulated by an atmosphere–ocean coupled model is validated with the long-term observations [Climate Prediction Center (CPC) Merged Analysis of Precipitation (CMAP) rainfall, ECMWF analysis, and Reynolds' SST]. This validation focuses on the three-dimensional water vapor cycle associated with the BSISO and its interaction with underlying sea surface. The advantages of a coupled approach over stand-alone atmospheric approaches on the simulation of the BSISO are revealed through an intercomparison between a coupled run and two atmosphere-only runs. This coupled model produces a BSISO that mimics the one presented in the observations over the Asia– western Pacific region. The similarities with the observations include 1) the coherent spatiotemporal evolutions of rainfall, surface winds, and SST associated with the BSISO; 2) the intensity and period (or speed) of the northward-propagating BSISO; and 3) the tropospheric moistening (or drying) and ove...

[1]  Bin Wang,et al.  Dynamics of Tropical Low-Frequency Waves: An Analysis of the Moist Kelvin Wave , 1988 .

[2]  Bin Wang,et al.  Development Characteristics and Dynamic Structure of Tropical Intraseasonal Convection Anomalies , 1990 .

[3]  Duane E. Waliser,et al.  The Influence of Coupled Sea Surface Temperatures on the Madden–Julian Oscillation: A Model Perturbation Experiment , 1999 .

[4]  Bin Wang,et al.  Tropical and mid-latitude 45-day perturbations over the Western Pacific during the northern summer , 1996 .

[5]  P. Richardson,et al.  Observations of the Mindanao Current during the western equatorial Pacific Ocean circulation study , 1991 .

[6]  R. Lindzen,et al.  On the role of sea surface temperature gradients in forcing low-level winds and convergence in the tropics , 1987 .

[7]  M. Tiedtke.  A Comprehensive Mass Flux Scheme for Cumulus Parameterization in Large-Scale Models , 1989 .

[8]  Thomas M. Smith,et al.  Improved Global Sea Surface Temperature Analyses Using Optimum Interpolation , 1994 .

[9]  William B. Rossow,et al.  Effects of Cloud Vertical Structure on Atmospheric Circulation in the GISS GCM , 1998 .

[10]  D. E. Harrison,et al.  Monsoon Breaks and Subseasonal Sea Surface Temperature Variability in the Bay of Bengal , 2002 .

[11]  I. Bladé.  Dynamics, Thermodynamics and Extratropical Interactions of Tropical Intraseasonal Oscillations in a Simple Nonlinear Model. , 1993 .

[12]  Chih-Pei Chang.  Viscous Internal Gravity Waves and Low–Frequency Oscillations in the Tropics , 1977 .

[13]  Xiaosu Xie,et al.  A Model for the Boreal Summer Intraseasonal Oscillation , 1997 .

[14]  Yoshikazu Hayashi,et al.  Space-Time Spectral Analysis and its Applications to Atmospheric Waves , 1982 .

[15]  K. Lau,et al.  Principal Modes of Climatological Seasonal and Intraseasonal Variations of the Asian Summer Monsoon , 1999 .

[16]  D. Randall,et al.  Low-Frequency Oscillations in Radiative-Convective Systems , 1994 .

[17]  Roger Lukas,et al.  The mixed layer of the western equatorial Pacific Ocean , 1991 .

[18]  P. Webster,et al.  Monsoons: Processes, predictability, and the prospects for prediction , 1998 .

[19]  Bin Wang,et al.  Coupling between Northward-Propagating, Intraseasonal Oscillations and Sea Surface Temperature in the Indian Ocean* , 2003 .

[20]  A. Matthews,et al.  Intraseasonal oscillations in 15 atmospheric general circulation models: results from an AMIP diagnostic subproject , 1996 .

[21]  Michael E. Schlesinger,et al.  The Dependence on Convection Parameterization of the Tropical Intraseasonal Oscillation Simulated by the UIUC 11-Layer Atmospheric GCM , 1999 .

[22]  D. Raymond.  A New Model of the Madden–Julian Oscillation , 2001 .

[23]  M. Claussen,et al.  The atmospheric general circulation model ECHAM-4: Model description and simulation of present-day climate , 1996 .

[24]  Peter J. Webster,et al.  Mechanisms of Monsoon Low-Frequency Variability: Surface Hydrological Effects , 1983 .

[25]  K. Lau,et al.  Dynamical and Boundary Forcing Characteristics of Regional Components of the Asian Summer Monsoon , 2000 .

[26]  K. Lau,et al.  Aspects of the 40 50 Day Oscillation during the Northern Summer as Inferred from Outgoing Longwave Radiation , 1985 .

[27]  J. Slingo,et al.  On the maintenance and initiation of the intraseasonal oscillation in the NCEP/NCAR reanalysis and in the GLA and UKMO AMIP simulations , 1997 .

[28]  Bin Wang,et al.  Simulation of the Intraseasonal Oscillation in the ECHAM-4 Model: The Impact of Coupling with an Ocean Model* , 2001 .

[29]  P. R. Julian,et al.  Detection of a 40–50 Day Oscillation in the Zonal Wind in the Tropical Pacific , 1971 .

[30]  Bin Wang,et al.  An Intermediate Model of the Tropical Pacific Ocean , 1995 .

[31]  Debasis Sengupta,et al.  BOBMEX: The Bay of Bengal Monsoon Experiment , 2001 .

[32]  A. Kitoh,et al.  Monsoon low‐frequency intraseasonal oscillation and ocean‐atmosphere coupling over the Indian Ocean , 2004 .

[33]  Tetsuzo Yasunari,et al.  Cloudiness Fluctuations Associated with the Northern Hemisphere Summer Monsoon , 1979 .

[34]  D. Waliser,et al.  Three-Dimensional Water Vapor and Cloud Variations Associated with the Madden–Julian Oscillation during Northern Hemisphere Winter , 2003 .

[35]  T. N. Krishnamurti,et al.  Summer Monsoon Experiment—A Review , 1985 .

[36]  Sulochana Gadgil,et al.  Monsoon precipitation in the AMIP runs , 1998 .

[37]  Bin Wang,et al.  Synoptic climatology of transient tropical intraseasonal convection anomalies: 1975–1985 , 1990 .

[38]  Harry H. Hendon,et al.  The Life Cycle of the Madden–Julian Oscillation , 1994 .

[39]  Bin Wang,et al.  Intercomparison of the climatological variations of Asian summer monsoon precipitation simulated by 10 GCMs , 2002 .

[40]  Bin Wang,et al.  Low-Frequency Equatorial Waves in Vertically Sheared Zonal Flow. Part II: Unstable Waves , 1996 .

[41]  Bin Wang,et al.  Interannual Variations of the Boreal Summer Intraseasonal Oscillation in the Asian Pacific Region(. , 2003 .

[42]  T. N. Krishnamurti,et al.  Air–Sea Interaction on the Time Scale of 30 to 50 Days , 1988 .

[43]  Matthew C. Wheeler,et al.  Convectively Coupled Equatorial Waves: Analysis of Clouds and Temperature in the Wavenumber–Frequency Domain , 1999 .

[44]  Ka-Ming Lau,et al.  Origin of Low-Frequency (Intraseasonal) Oscillations in the Tropical Atmosphere. Part I: Basic Theory , 1987 .

[45]  A. Tompkins.  On the Relationship between Tropical Convection and Sea Surface Temperature , 2001 .

[46]  Modes of Tropical Variability under Convective Adjustment and the Madden–Julian Oscillation. Part I: Analytical Theory , 1994 .

[47]  Bin Wang,et al.  Impacts of Air–Sea Coupling on the Simulation of Mean Asian Summer Monsoon in the ECHAM4 Model* , 2002 .

[48]  Bin Wang,et al.  Equatorial Waves and Air–Sea Interaction in the Boreal Summer Intraseasonal Oscillation , 2001 .

[49]  A. Kitoh,et al.  The equatorial 30-60 day oscillation and the Arakawa-Schubert penetrative cumulus parameterization , 1988 .

[50]  Maria Flatau,et al.  The Feedback between Equatorial Convection and Local Radiative and Evaporative Processes: The Implications for Intraseasonal Oscillations , 1997 .

[51]  M. Mcphaden,et al.  Intraseasonal surface cooling in the equatorial western Pacific , 2000 .

[52]  Brian E. Mapes,et al.  Influence of cloud-radiation interaction on simulating tropical intraseasonal oscillation with an atmospheric general , 2001 .

[53]  Bin Wang,et al.  Coupled Modes of the Warm Pool Climate System. Part I: The Role of Air–Sea Interaction in Maintaining Madden–Julian Oscillation , 1998 .

[54]  E. Maloney,et al.  The Sensitivity of Intraseasonal Variability in the NCAR CCM3 to Changes in Convective Parameterization , 2001 .

[55]  B. Goswami,et al.  Coherent intraseasonal oscillations of ocean and atmosphere during the Asian Summer Monsoon , 2001 .

[56]  H. Hendon.  Impact of Air-Sea Coupling on the Madden-Julian Oscillation in a General Circulation Model , 2000 .

[57]  C. Jones,et al.  The Role of Coupled Sea Surface Temperatures in the Simulation of the Tropical Intraseasonal Oscillation , 2004 .

[58]  K. Mo,et al.  Intraseasonal Modulation of Summer Precipitation over North America , 2000 .

[59]  P. Xie,et al.  Global Precipitation: A 17-Year Monthly Analysis Based on Gauge Observations, Satellite Estimates, and Numerical Model Outputs , 1997 .

[60]  Philippe Gaspar,et al.  Modeling the Seasonal Cycle of the Upper Ocean , 1988 .

[61]  P. Webster,et al.  TOGA COARE: The Coupled Ocean-Atmosphere Response Experiment. , 1992 .

[62]  T. N. Krishnamurti,et al.  One-Month Forecasts of Wet and Dry Spells of the Monsoon , 1992 .

[63]  Wojciech W. Grabowski,et al.  MJO-like Coherent Structures: Sensitivity Simulations Using the Cloud-Resolving Convection Parameterization (CRCP) , 2003 .

[64]  G. Meehl,et al.  AGCM simulations of intraseasonal variability associated with the Asian summer monsoon , 2003 .

[65]  Duane E. Waliser,et al.  Potential Predictability of the Madden–Julian Oscillation , 2003 .

[66]  Ka-Ming Lau,et al.  Origin of low frequency (intraseasonal) oscillations in the tropical atmosphere. III - Monsoon dynamics , 1990 .

[67]  Chidong Zhang.  Atmospheric Intraseasonal Variability at the Surface in the Tropical Western Pacific Ocean , 1996 .

[68]  Bin Wang,et al.  A coupled modeling study of the seasonal cycle of the Pacific cold tongue , 2001 .

[69]  Bin Wang,et al.  Differences of Boreal Summer Intraseasonal Oscillations Simulated in an Atmosphere–Ocean Coupled Model and an Atmosphere-Only Model* , 2004 .