Mechanistic analysis of the suppressed convective anomaly precursor associated with the initiation of primary MJO events over the tropical Indian Ocean

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• 作者：Yangyang Yong ; Jiangyu Mao
• 关键词：Primary Madden–Julian oscillation ; Suppressed convective anomaly ; Descending motion ; Extratropical disturbances
• 刊名：Climate Dynamics
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：46
• 期：3-4
• 页码：779-795
• 全文大小：7,611 KB
• 参考文献：Allen G, Vaughan G, Brunner D, May PT, Heyes W, Minnis P, Ayers JK (2009) Modulation of tropical convection by breaking Rossby waves. Q J R Meteorol Soc 135:125–137CrossRef
  Bretherton CS, Widmann M, Dymnikov VP, Wallace JM, Blade I (1999) The effective number of spatial degrees of freedom of a time-varying field. J Clim 12:1990–2009CrossRef
  Colby JR, Frank P (1984) Convective inhibition as a predictor of convection during AVE-SESAME II. Mon Weather Rev 112:2239–2252CrossRef
  Emanuel KA (1987) An air-sea interaction model of intraseasonal oscillations in the tropics. J Atmos Sci 44:2324–2340CrossRef
  Gill AE (1980) Some simple solutions for heat-induced tropical circulation. Q J R Meteorol Soc 106:447–462CrossRef
  Gottschalck J, Roundy P, Schreck C, Vintzileos A, Zhang C (2013) Large-scale atmospheric and oceanic conditions during the 2011–12 DYNAMO field campaign. Mon Weather Rev 141:4173–4196CrossRef
  Hall JD, Matthews AJ, Karoly DJ (2001) The modulation of tropical cyclone activity in the Australian region by the Madden–Julian oscillation. Mon Weather Rev 129:2970–2982CrossRef
  Hendon HH (1988) A simple model of the 40–50-day oscillation. J Atmos Sci 45:569–584CrossRef
  Hendon HH, Salby ML (1996) Planetary-scale circulations forced by intraseasonal variations of observed convection. J Atmos Sci 53:1751–1758CrossRef
  Hoskins BJ, James IN, White GH (1983) The shape, propagation and mean-flow interaction of large-scale weather systems. J Atmos Sci 40:1595–1612CrossRef
  Hoskins BJ, Mcintyre ME, Robertson AW (1985) On the use and significance of isentropic potential vorticity maps. Q J R Meteorol Soc 111:877–946CrossRef
  Hsu HH, Hoskins BJ, Jin FF (1990) The 1985/86 intraseasonal oscillation and the role of the extratropics. J Atmos Sci 47:823–839CrossRef
  Jones C, Carvalho LMV, Higgins RW, Waliser DE, Schemm JKE (2004) Climatology of tropical intraseasonal convective anomalies: 1979–2002. J Clim 17:523–539CrossRef
  Kalnay E et al (1996) The NCEP/NCAR 40-year reanalysis project. Bull Am Meteorol Soc 77:437–471CrossRef
  Kikuchi K, Wang B, Kajikawa Y (2012) Bimodal representation of the tropical intraseasonal oscillation. Clim Dyn 38:1989–2000CrossRef
  Knutson TR, Weickmann KM (1987) 30–60 day atmospheric oscillations: composite life cycles of convection and circulation anomalies. Mon Weather Rev 115:1407–1436CrossRef
  Lau KM, Chan P (1986) The 40–50 day oscillation and the El Niño/Southern oscillation: a new perspective. Bull Am Meteorol Soc 67:533–534CrossRef
  Lau KM, Peng L (1987) Origin of low-frequency (intraseasonal) oscillations in the tropical atmosphere. Part I: basic theory. J Atmos Sci 44:950–972CrossRef
  Lawrence DM, Webster PJ (2002) The boreal summer intraseasonal oscillation: relationship between northward and eastward movement of convection. J Atmos Sci 59:1593–1606CrossRef
  Lee JY, Wang B, Wheeler MC, Fu XH, Waliser DE, Kang IS (2013) Real-time multivariate indices for the boreal summer intraseasonal oscillation over the Asian summer monsoon region. Clim Dyn 40:493–509CrossRef
  Liebmann B, Smith CA (1996) Description of a complete (interpolated) outgoing longwave radiation dataset. Bull Am Meteorol Soc 77:1275–1277
  Liebmann B, Hendon HH, Glick JD (1994) The relationship between tropical cyclones of the western Pacific and Indian Oceans and the Madden–Julian oscillation. J Meteorol Soc Jpn 72:401–411
  Ling J, Li C, Zhou W, Jia X (2014) To begin or not to begin? a case study on the MJO initiation problem. Theor Appl Climatol 115:231–241CrossRef
  Liu B, Liu Y, Wu G, Yan J, He J, Ren S (2014) Asian summer monsoon onset barrier and its formation mechanism. Clim Dyn. doi:10.​1007/​s00382-014-2296-0
  Madden RA, Julian PR (1971) Detection of a 40–50 day oscillation in the zonal wind in the tropical Pacific. J Atmos Sci 28:702–708CrossRef
  Madden RA, Julian PR (1972) Description of global-scale circulation cells in the tropics with a 40–50 day period. J Atmos Sci 29:1109–1123CrossRef
  Maloney ED, Kiehl JT (2002) MJO-related SST variations over the tropical eastern Pacific during Northern Hemisphere summer. J Clim 15:675–689CrossRef
  Mao J, Chan JCL (2005) Intraseasonal variability of the South China Sea summer monsoon. J Clim 18:2388–2402CrossRef
  Mao J, Wu G (2010) Intraseasonal modulation of tropical cyclogenesis in the western North Pacific: a case study. Theor Appl Climatol 100:397–411CrossRef
  Mao J, Sun Z, Wu G (2010) 20–50-day oscillation of summer Yangtze rainfall in response to intraseasonal variations in the subtropical high over the western North Pacific and South China Sea. Clim Dyn 34:747–761CrossRef
  Matthews AJ (2008) Primary and successive events in the Madden–Julian oscillation. Q J R Meteorol Soc 134:439–453CrossRef
  Matthews AJ, Hoskins BJ, Masutani M (2004) The global response to tropical heating in the Madden–Julian oscillation during northern winter. Q J R Meteorol Soc 130:1–20CrossRef
  Mo KC (2000) Intraseasonal modulation of summer precipitation over North America. Mon Weather Rev 128:1409–1505
  Neelin JD, Yu JY (1994) Modes of tropical variability under convective adjustment and the Madden–Julian oscillation I: analytical theory. J Atmos Sci 51:1876–1894CrossRef
  North GR, Bell TL, Cahalan RF, Moeng FJ (1982) Sampling errors in the estimation of empirical orthogonal functions. Mon Weather Rev 110:699–706CrossRef
  Parsons DB, Redelsperger JL, Yoneyama K (2000) The evolution of the tropical western Pacific atmosphere-ocean system following the arrival of a dry intrusion. Q J R Meteorol Soc 126:517–548CrossRef
  Plumb RA (1985) On the three-dimensional propagation of stationary waves. J Atmos Sci 42:217–229CrossRef
  Plumb RA (1986) Three-dimensional propagation of transient quasi-geostrophic eddies and its relationship with the eddy forcing of the time-mean flow. J Atmos Sci 43:1657–1678CrossRef
  Ray P, Zhang C (2010) A case study on the mechanisms of extratropical influence on the Madden–Julian oscillation. J Atmos Sci 67:515–528CrossRef
  Redelsperger JL, Parsons DB, Guichard F (2002) Recovery processes and factors limiting cloud-top height following the arrival of a dry intrusion observed during TOGA COARE. J Atmos Sci 59:2438–2457CrossRef
  Shinoda T, Hendon HH, Glick J (1998) Intraseasonal variability of surface fluxes and sea surface temperature in the tropical western Pacific and Indian oceans. J Clim 11:1685–1702CrossRef
  Takaya K, Nakamura H (1997) A formulation of a wave-activity flux for stationary Rossby waves on a zonally varying basic flow. Geophys Res Lett 24:2985–2988CrossRef
  Takaya K, Nakamura H (2001) A formulation of a phase-independent wave-activity flux for stationary and migratory quasigeostrophic eddies on a zonally varying basic flow. J Atmos Sci 58:608–627CrossRef
  Tang Y, Yu B (2008) MJO and its relationship to ENSO. J Geophys Res 113:D14106. doi:10.​1029/​2007/​JD009230 CrossRef
  Tompkins AM (2001) On the relationship between tropical convection and sea surface temperature. J Clim 14:633–637CrossRef
  Waliser DE, Graham NE (1993) Convective cloud systems and warm-pool sea surface temperatures: coupled interactions and self-regulation. J Geophys Res 98:12881–12893CrossRef
  Webber BG, Matthews AJ, Heywood KJ, Stevens DP (2012) Ocean Rossby waves as a triggering mechanism for primary Madden–Julian events. Q J R Meteorol Soc 138:514–527CrossRef
  Wheeler MC, Hendon HH (2004) An all-season real-time multivariate MJO index: development of an index for monitoring and prediction. Mon Weather Rev 132:1917–1932CrossRef
  Wheeler MC, Hendon HH, Cleland S, Meinke H, Donald A (2009) Impact of the Madden–Julian oscillation on Australian rainfall and circulation. J Clim 22:1482–1498CrossRef
  Woolnough SJ, Slingo JM, Hoskins BJ (2000) The relationship between convection and sea surface temperature on intraseasonal timescales. J Clim 13:2086–2104CrossRef
  Wu R, Kirtman BP (2007) Regimes of seasonal air–sea interaction and implications for performance of forced simulations. Clim Dyn 29:393–410CrossRef
  Wu G, Liu Y (2000) Thermal adaptation, overshooting, dispersion, and subtropical anticyclone Part I: thermal adaptation and overshooting (in Chinese). Chin J Atmos Sci 24(4):433–446
  Yoneyama K, Parsons DB (1999) A proposed mechanism for the intrusion of dry air into the tropical western Pacific region. J Atmos Sci 56:1524–1546CrossRef
  Yu L, Jin X, and Weller RA (2008) Multidecade Global Flux Datasets from the Objectively Analyzed Air-sea Fluxes (OAFlux) Project: latent and sensible heat fluxes, ocean evaporation, and related surface meteorological variables. Woods Hole Oceanographic Institution OAFlux Project Technical Report, Woods Hole, Massachusetts, OA-2008-01 64 pp
  Zhang C (2005) Madden–Julian oscillation. Rev Geophys 43:RG2003. doi:10.​1029/​2004RG000158
  Zhang C, Gottschalck J, Maloney ED, Moncrieff MW, Vitart F, Waliser DE, Wang B, Wheeler MC (2013) Cracking the MJO nut. Geophys Res Lett 40:1223–1230CrossRef
  Zhou W, Chan JCL (2005) Intraseasonal oscillations and the South China Sea summer monsoon onset. Int J Climatol 25:1585–1609CrossRef
  
• 作者单位：Yangyang Yong (1) (3)
  Jiangyu Mao (1) (2)
  
  1. State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, P.O. Box 9804, Beijing, 100029, China
  3. University of Chinese Academy of Science, Beijing, 100049, China
  2. Joint Center for Global Change Studies, Beijing, 100875, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geophysics and Geodesy
  Meteorology and Climatology
  Oceanography
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-0894

文摘

A primary Madden–Julian oscillation (MJO) event is one with no immediately preceding MJO event. Most primary MJO events initiating over the tropical Indian Ocean are preceded by a local suppressed convective anomaly (SCA). Based on daily outgoing longwave radiation and atmospheric circulation reanalysis data, composite analyses are performed to reveal the dynamical and thermodynamical mechanisms responsible for the generation of the precursor SCA associated with anomalous descending motion. During the developing stage, before the maximum SCA, the anomalous descending motion in the upper troposphere is dynamically forced by anomalous convergence over the eastern equatorial Indian Ocean. The anomalous convergent winds result from changes in subtropical circulation structures forced by extratropical disturbances in association with equatorward advection of positive potential vorticity. In the lower troposphere, the anomalous stable boundary layer with a strong thermal inversion is the dominant factor leading to descending motion. The sea surface temperature (SST) perturbations in the tropical Indian Ocean are an external forcing that generates the SCA through surface energy exchange. The negative SST anomalies in the northwestern portion of the tropical Indian Ocean act as a heat sink to cool the lower-tropospheric atmosphere, forcing strong descending motion and forming an anomalous anticyclone north of the equator. Meanwhile, the positive SST anomalies in the southeastern portion act as a heat source that forces anomalous divergent westerlies and northwesterlies toward the warmer SST area. Thus, anomalous descending motion is induced around the equator. Keywords Primary Madden–Julian oscillation Suppressed convective anomaly Descending motion Extratropical disturbances