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Dynamics of upper tropospheric stationary wave anomalies induced by ENSO during the northern summer: A GCM study

  • R. Krishnan
  • C. Venkatesan
  • R. N. Keshavamurty
Article

Abstract

Ensemble seasonal integrations are carried out with the COLA GCM, with a view to understand the dynamical connection between warm SST anomalies in the equatorial central-eastern Pacific Ocean and the upper level stationary wave anomalies seen during drought years over the Indian summer monsoon region. In addition, experiments with and without orography are performed in order to examine the role of the Himalayas in modulating the El Niño induced stationary wave anomalies over the summer monsoon region.

The GCM simulations show a statistically significant weakening of the summer monsoon activity over India in response to the SST forcing in the equatorial Pacific Ocean. This weakening of the summer monsoon appears to be largely related to modifications of the local Hadley and Walker cells over the summer monsoon region. In addition, it is seen that the anomalous ENSO divergent forcing over the tropical Pacific Ocean can act as a potential source for Rossby wave dispersion. Here one finds the possibility of meridionally propagating Rossby waves, which emanate from the ENSO forcing region, to interact with the subtropical westerlies and generate anomalous highs and lows in the subtropics and extratropics. The quasi-stationary perturbations seen over west Asia, Pakistan and northwest India during drought years, seem to be generated by the above mechanism. An alternate mechanism that could be important for the persistence of the quasi-stationary perturbations seems to be based on the dynamic excitation of middle latitude normal modes which can extract energy from the zonally varying unstable basic flow.

It is seen from the GCM simulations, that the Himalayan orography plays a crucial role in anchoring the El Niño induced extratropical westerly troughs far to the west in the high latitude belt. In the absence of orography it is seen that the ENSO induced extra-tropical cyclonic anomalies tend to intrude southward into the monsoon region thereby destroying the regional scale circulations completely. Another effect due to the Himalayas is to generate lee waves on the eastern side of the topographic barrier which encircle the globe in the subtropics and midlatitudes.

Keywords

Stationary wave anomalies ENSO Rossby wave dispersion Indian summer monsoon 

List of Abbreviations

CLIM

Climatology

COLA

Center for Ocean Land Atmosphere Interactions

ENSO

El Niño— Southern Oscillation

GCM

General Circulation Model

GFDL

Geophysical Fluid Dynamics Laboratory

IAV

Interannual Variability

ISM

Indian Summer Monsoon

ITCZ

Inter Tropical Convergence Zone

JJAS

June, July, August, September

MONEX

Monsoon Experiment

NCAR

National Center for Atmospheric Research

NCEP

National Centers for Environmental Prediction

NMC

National Meteorological Center

PNA

Pacific North American

SO

Southern Oscillation

SST

Sea Surface Temperature

TEJ

Tropical Easterly Jet

T30L18

Triangular Trunctation at 30 Waves and 18 Vertical Levels

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References

  1. Anthes R A 1977 Hurricane model experiments with a new cumulus parameterization scheme;Mon. Weather. Rev. 105 287–300CrossRefGoogle Scholar
  2. Banerjee S K 1929 The effect of Indian mountain ranges on the configuration of isobars;Indian J. Phys. 4 477–502Google Scholar
  3. Bedi H S, Billa H S and Mukherjee N 1981 Interaction between northern middle latitudes and summer monsoon circulation;Int. Conf. on early results of FGGE and large scale aspects of its monsoon experiments. GARP Tallahassee, Florida, 12–17 January 1981, pp 5–25 to 5–29Google Scholar
  4. Bhalme H N and Jadhav S K 1984 The southern oscillation and its relation to the monsoon rainfall;J. Climatol. 4 509–520CrossRefGoogle Scholar
  5. Bhalme H N and Mooley D A 1980 Large-scale droughts/floods and monsoon circulation;Mon. Weather Rev. 108 1197–1211CrossRefGoogle Scholar
  6. Bjerknes J 1966 A possible response of the atmospheric Hadley circulation to equatorial anomalies of ocean temperature;Tellus 18 820–829Google Scholar
  7. Bjerknes J 1969 Atmospheric teleconnections from the equatorial Pacific;Mon. Weather Rev. 97 163–172CrossRefGoogle Scholar
  8. Blackmon M L, Branstator G, Bates G T and Geisler J E 1987 An analysis of equatorial sea surface temperature anomaly experiments in general circulation models with and without mountains;J. Atmos. Sci. 44 1828–1844CrossRefGoogle Scholar
  9. Brankovic C, Palmer T N and Ferranti L 1993 Predictability of seasonal atmospheric variations;J. Climate 7 217–237CrossRefGoogle Scholar
  10. Branstator G 1985a Analysis of general circulation sea surface temperature anomaly simulation using a linear model. Part I: Forced solutions;J. Atmos. Sci. 42 2225–2241CrossRefGoogle Scholar
  11. Branstator G 1985b Analysis of general circulation sea surface temperature anomaly simulation using a linear model. Part II: Eigenanalysis;J. Atmos. Sci. 42 2242–2254CrossRefGoogle Scholar
  12. Broccoli A J and Manabe S 1992 The effects of orography on midlatitude northern hemisphere dry climates;J. Climate. 5 1181–1201CrossRefGoogle Scholar
  13. Changraney T G 1966 The role of westerly waves in causing flood producing storms over northwest India (excluding Rajastan and Gujarat) during southwest monsoon;Indian J. Met. Geophy. 17 119–126Google Scholar
  14. Chen T C and Yen M C 1994 Interannual variation of the Indian monsoon simulated by the NCAR community climate model: Effect of tropical Pacific SST;J. Climate 7 1403–1415CrossRefGoogle Scholar
  15. Chervin R M and Schneider S H 1976 On determining the statistical significance of climate experiments with general circulation models;J. Atmos. Sci. 33 405–412CrossRefGoogle Scholar
  16. Fennessy M J, Kinter J L, Kirtman B, Marx L, Nigam S, Schneider E, Shukla J, Vernekar A, Xue Y and Zhou J 1994 The simulated Indian monsoon. A GCM sensitivity study;J. Climate 7 33–43CrossRefGoogle Scholar
  17. Gadgil S 1977 Orographie effect on the southwest monsoon — a review;Pure Appld. Geophys. 115 1413–1430CrossRefGoogle Scholar
  18. Gilchrist A 1977 The simulation of the Asian Summer Monsoon;Pure Appld. Geophys. 115 1431–1448CrossRefGoogle Scholar
  19. Gill A E 1980 Some simple solutions for heat induced tropical circulation;Q. J. R. Meteorol. Soc. 106 447–463CrossRefGoogle Scholar
  20. Godbole R V 1973 Numerical simulation of the Indian summer monsoon;Indian J. Meteorol. Geophys. 24 1–14Google Scholar
  21. Goswami B N 1994 Dynamical predictability of seasonal monsoon rainfall. Problems and prospects;Proc. Indian Natl. Acad. Sci. 60A 101–120Google Scholar
  22. Hahn D G and Manabe S 1975 The role of mountains in the south Asian monsoon circulation;J. Atmos. Sci. 32 1515–1541CrossRefGoogle Scholar
  23. Harshvardhan, Davis R, Randall D A and Corsetti T G 1987 A fast radiation parameterization for general circulation models;J. Geophys. Res. 92 1000–1016CrossRefGoogle Scholar
  24. Holton J R 1979 An introduction to Dynamic Meteorology; Academic Press, pp 89–90Google Scholar
  25. Horel J D 1981 A rotated principal component analysis of the interannual variability of the northern hemisphere 500 mb height field;Mon. Weather Rev. 109 2080–2092CrossRefGoogle Scholar
  26. Horel J D and Wallace J M 1981 Planetary scale atmospheric phenomena associated with the Southern Oscillation;Mon. Weather Rev. 109 813–829CrossRefGoogle Scholar
  27. Hoskins B J and Karoly D J 1981 The steady linear response of spherical atmosphere to thermal and orographical forcing;J. Atmos. Sci. 38 1179–1196CrossRefGoogle Scholar
  28. Joseph P V 1978 Sub-tropical westerlies in relation to large scale failure of Indian monsoon;Indian J. Met. Hydrol. Geophys. 29 412–418Google Scholar
  29. Joseph P V, Mukhopadhyaya R K, Dixit N V and Vaidya D V 1981 Meridional wind index for long range forecasting of Indian summer monsoon rainfall;Mausam 32 31–34Google Scholar
  30. Ju J and Slingo J 1995 The Asian summer monsoon and ENSO;Q. J. R. Meteorol. Soc. 121 1133–1168CrossRefGoogle Scholar
  31. Kalnay E, Kanamitsu M, Kistler R, Collins W, Deaven W, Gandin L, Iredell M, Saha S, White G, Woollen J, Zhu Y, Chelliah M, Ebisuzaki W, Higgins W, Janowiak J, Mo K C, Ropelewski C, Wang J, Leetmaa A, Reynolds R, Roy Jenne and Dennis Joseph 1996 The NCEP/NCAR 40-Year Reanalysis Project;Bull. Amer. Meteorol. Soc. 77 437–471CrossRefGoogle Scholar
  32. Kanamitsu M, Krishnamurti T N and Depradine C 1972 On scale interaction in the tropics during northern summer;J. Atmos. Sci. 29 698–706CrossRefGoogle Scholar
  33. Kanamitsu M and Krishnamurti T N 1978 Northern summer tropical circulations during drought and normal rainfall months;Mon. Weather Rev. 106 331–347CrossRefGoogle Scholar
  34. Keshavamurty R N 1982 Response of the atmosphere to sea surface temperature anomalies over the equatorial Pacific and teleconnection of the southern oscillation;J. Atmos. Sci. 39 1241–1259CrossRefGoogle Scholar
  35. Keshavamurty R N and Awade S T 1974 Dynamical abnormalities associated with drought in the Asiatic summer monsoon;Indian J. Met. Geophysics 25 257–266Google Scholar
  36. Keshavamurty R N, Satyan V, Dash S K and Sinha H S S 1980 Shift of quasi-stationary features during active and break monsoons;Proc. Indian Acad. Sci., (Earth Planet. Sci.) 97 127–136Google Scholar
  37. Kiladis G N and Diaz H F 1989 Global climatic anomalies associated with extremes in the Southern Oscillation;J. Climate. 2 1069–1090CrossRefGoogle Scholar
  38. Krishnamurti T N 1971a Tropical east-west circulations during the northern summer;J. Atmos. Sci. 28 1342–1347CrossRefGoogle Scholar
  39. Krishnamurti T N 1971b Observational study of the tropical upper tropospheric motion field during the northern hemispheric summer;J. Appl. Meteor. 10 1066–1096CrossRefGoogle Scholar
  40. Krishnamurti T N, Bedi H S and Subramaniam M 1989 The summer monsoon of 1987;J. Climate. 2 321–340CrossRefGoogle Scholar
  41. Krishnamurti T N, Bedi H S and Subramaniam M 1990 The summer monsoon of 1988;Met. Atmos. Phys. 42 19–37CrossRefGoogle Scholar
  42. Krishnamurti T N, Daggupaty S M, Fein J, Kanamitsu M and Lee J D 1973 Tibetan high and upper tropospheric tropical circulations during northern summer;Bull. Amer. Meteorol. Soc. 54 1234–1249Google Scholar
  43. Krishnamurti T N and Surgi N 1987 Observational aspects of summer monsoon;Monsoon Meteorology (ed.) C P Chang and T N Krishnamurti Oxford University Press, 3–25Google Scholar
  44. Krishnan R and Fennessy M J 1997 GCM simulations of intraseasonal variability in the Indian summer monsoon;Tech. Rep. No. 40, Center for Ocean Land Atmosphere Interactions (COLA), USA Google Scholar
  45. Krishnan R and Mujumdar M 1997 Regionally and remotely forced premonsoon signals over northern India and neighbourhood;Q. J. R. Meteorol. Soc. (under revision)Google Scholar
  46. Kuo H L 1965 On the formation and intensification of tropical cyclones through latent heat release by cumulus convection;J. Atmos. Sci. 22 40–63CrossRefGoogle Scholar
  47. Lacis A A and Hansen J E 1974 A parameterization for the absorption of solar radiation in the earth’s atmosphere;J. Atmos. Sci. 31 118–133CrossRefGoogle Scholar
  48. Lau K M and Lim H 1984 On the dynamics of equatorial forcing and climate teleconnections;J. Atmos. Sci. 41 161–176CrossRefGoogle Scholar
  49. Lau K M and Peng L 1992 Dynamics of atmospheric teleconnections during the northern summer;J. Climate 5 140–158CrossRefGoogle Scholar
  50. Lau K M and Sheu P J 1988 Annual cycle, quasi-biennial oscillation and southern oscillation in global precipitation;J. Geophys. Res. 93 10975–10988CrossRefGoogle Scholar
  51. Matsuno T 1966 Quasi-geostrophic motions in the equatorial area;J. Meteorol. Soc. Japan 44 25–43Google Scholar
  52. Mellor G L and Yamada T 1982 Development of a turbulence closure model for geophysical fluid problems;Rev. Geophys. Space Phys. 20 851–875CrossRefGoogle Scholar
  53. Miller M J, Beljaars A C M and Palmer T N 1992 The sensitivity of the ECMWF model to the parameterization of evaporation from the tropical oceans;J. Climate 5 418–434CrossRefGoogle Scholar
  54. Mooley D A 1957 The role of western disturbances in the production of weather over India during different seasons;Indian J. Met. Geophy. 8 253–260Google Scholar
  55. Murakami T 1974 Steady and transient waves excited by diabatic heat sources during the summer monsoon;J. Atmos. Sci. 31 340–357CrossRefGoogle Scholar
  56. Nigam S 1994 On the dynamical basis for the Asian summer monsoon Rainfall-El Niño relationship;J. Climate 7 1750–1771CrossRefGoogle Scholar
  57. Palmer T N, Brankovic C, Viterbo P and Miller M J 1992 Modelling interannual variations of summer monsoons;J. Climate 5 399–417CrossRefGoogle Scholar
  58. Pan H-L 1979 Upper tropospheric tropical circulations during a recent decade;Report No. 79-1, Department of Meteorology, Florida State University, Tallahassee, FloridaGoogle Scholar
  59. Pant G B and Parthasarthy B 1981 Some aspects of an association between the Southern Oscillation and Indian summer monsoons;Arch. Meteor. Geophys. Biokl. B29 245–252CrossRefGoogle Scholar
  60. Parthasarathy B, Diaz H F and Eischeid J K 1988 Prediction of all-India summer monsoon rainfall with regional and largescale parameters;J. Geophys. Res. 93 D5 5341–5350CrossRefGoogle Scholar
  61. Parthasarathy B, Munot A A and Kothawale D R 1995 Monthly and seasonal rainfall series for All-India homogenous regions and meteorological subdivisions: 1871–1994;Research Report No. RR-065, Indian Institute of Tropical Meteorology, Pune, IndiaGoogle Scholar
  62. Pisharoty P R and Desai B N 1956 Western disturbances and Indian weather;Indian. J. Met. Geophys. 7 4 333–338Google Scholar
  63. Rajeevan M 1991 Upper air circulation and thermal anomalies over India and neighbourhood vis-a-vis Indian summer monsoon activity;Mausam 42 155–160Google Scholar
  64. Rajeevan M 1993 Upper tropospheric circulation and thermal anomalies over central Asia associated with major drought and floods in India;Curr. Sci. 64 244–247Google Scholar
  65. Ramamurthy K 1969 Some aspects of ‘break’ in the Indian southwest monsoon during July and August;Forecasting manual, Indian Meteorological Department Publication, FMU, Rep.4, 18.3Google Scholar
  66. Raman C R V and Rao Y P 1981 Blocking highs over Asia and monsoon droughts over India;Nature 289 221–223CrossRefGoogle Scholar
  67. Ramaswamy C 1958 A preliminary study of the behaviour of the Indian southwest monsoon in relation to the westerly jet stream;Geophysica 6 455–476Google Scholar
  68. Ramaswamy C 1962 Breaks in the Indian summer monsoon as a phenomenon of interaction between the easterly and subtropical westerly jet streams;Tellus 14 337–349CrossRefGoogle Scholar
  69. Rasmusson E M and Carpenter T H 1983 The relationship between eastern equatorial Pacific sea surface temperature and rainfall over India and Sri Lanka;Mon. Weather Rev. 111 517–528CrossRefGoogle Scholar
  70. Rasmusson E M and Mo K-C 1993 Linkages between 200-mb tropical and extratropical anomalies during the 1986–1989 ENSO cycle;J. Climate 6 595–616CrossRefGoogle Scholar
  71. Rasmusson E M and Wallace J M 1983 Meteorological aspects of the El Niño/Southern Oscillation;Science 222 1195–1202CrossRefGoogle Scholar
  72. Reynolds R W and Smith T M 1994 Improved global sea surface temperature analyses using optimum interpolation;J. Climate 7 929–948CrossRefGoogle Scholar
  73. Ropelewski C F and Halpert M S 1987 Global and regional scale precipitation patterns association with El Niño/Southern Oscillation;Mon. Weather Rev. 115 1606–1626CrossRefGoogle Scholar
  74. Rowntree P R 1972 The influence of tropical east Pacific Ocean temperature on the atmosphere;Q. J. R. Meteorol. Soc. 98 290–321CrossRefGoogle Scholar
  75. Sardeshmukh P D and Hoskins B J 1988 The generation of global rotational flow by steady idealized tropical divergence;J. Atmos. Sci. 40 1228–1251CrossRefGoogle Scholar
  76. Sarkar R P 1966 A dynamical model of orographie rainfall;Mon. Weather Rev. 94 555–572CrossRefGoogle Scholar
  77. Schemm J, Schubert S, Terry J and Bloom S 1992 Estimates of monthly mean soil moisture for 1979–1989; NASA Tech. Mem. 104571, October 1992, Goddard Space Flight Center, Greenbelt, MD 20771Google Scholar
  78. Sela J G 1982 The NMC spectral model; NMC Office Note 30, U.S. Department of Commerce, NOAA, NWS, 36 ppGoogle Scholar
  79. Shukla J 1975 Effect of Arabian sea-surface temperature anomaly on Indian summer monsoon. A numerical experiment with the GFDL model;J. Atmos. Sci. 32 503–511CrossRefGoogle Scholar
  80. Shukla J and Fennessy M J 1994 Simulation and predictability of Monsoons;Proc. International Conference on Monsoon Variability and Prediction, ICTP, Trieste, WMO/TD-No.619. 567–575Google Scholar
  81. Shukla J and Paolino D A 1983 The Southern Oscillation and long range forecasting of the summer monsoon rainfall over India;Mon. Weather Rev. 111 1830–1837CrossRefGoogle Scholar
  82. Shukla J and Wallace J M 1983 Numerical simulation of the atmospheric response to equatorial Pacific sea surface temperature anomalies;J. Atmos. Sci. 40 1613–1630CrossRefGoogle Scholar
  83. Sikka D R 1980 Some aspects of the large-scale fluctuations of summer monsoon rainfall over India in relation to fluctuations in planetary and regional scale circulation parameters;Proc. Indian Acad. Sci. (Earth Planet. Sci.) 89 179–195Google Scholar
  84. Sikka D R and Grossman H 1981 Large scale features associated with the evolution and intensification of the break monsoon over India during August 1979; Florida MONEX Conference, 1–67 to 1–70Google Scholar
  85. Simmons A J, Wallace J M and Branstator G 1983 Barotropic wave propagation and instability and atmospheric teleconnection patterns;J. Atmos. Sci. 40 1363–1392CrossRefGoogle Scholar
  86. Simpson G C 1921 The southwest monsoon;Q. J. R. Met. Soc. 47 151–172CrossRefGoogle Scholar
  87. Spangler W M and Jenne R L 1990 World monthly surface station climatology; National Center for Atmospheric Research, Boulder, CO 80303Google Scholar
  88. Spencer R W 1993 Global oceanic precipitation from the MSU during 1979–91 and comparisons to other climatologies;J. Climate 6 1301–1326CrossRefGoogle Scholar
  89. Sperber K R, Hameed S, Potter G L and Boyle J S 1994 Simulation of the northern summer monsoon in the ECMWF model: Sensitivity to horizontal resolution;Mon. Weather Rev. 122 2461–2481CrossRefGoogle Scholar
  90. Stoeckenius T 1981 Interannual variations of tropical precipitation patterns;Mon. Weather Rev. 109 1233–1247CrossRefGoogle Scholar
  91. Sud Y C and Walker G K 1992 A review of recent research on improvement of physical parameterizations in the GLA GCM Physical Processes in Atmospheric Models; (eds) D R Sikka and S S Singh, Wiley Eastern 424–479Google Scholar
  92. Tiedke M 1984 The effect of penetrative cumulus convection on large scale flow in a general circulation model;Beitr. Phys. Atmos. 57 216–239Google Scholar
  93. Ting M 1994 Maintenance of northern summer stationary waves in a General Circulation Model;J. Atmos. Sci. 51 3286–3308CrossRefGoogle Scholar
  94. Unni Nayar M S and Murakami T 1978 Temporal variations in the northern hemispheric summer circulations;Indian J. Met. Geophy. 29 1 170–186Google Scholar
  95. Van Loon H and Madden R A 1981 The Southern Oscillation. Part I: Global associations with pressure and temperature in northern winter;Mon. Weather Rev. 109 1150–1162CrossRefGoogle Scholar
  96. Verma R K 1982 Long range prediction of monsoon activity: A synoptic diagnostic study;Mausam 33 35–44Google Scholar
  97. Wallace J M and Gutzler D S 1981 Teleconnections in the geopotential height field during the northern hemisphere winter;Mon. Weather Rev. 109 785–812Google Scholar
  98. Washington W M, Chervin R M and Rao G V 1977 Effects of a variety of Indian Ocean surface temperature anomaly patterns on the summer monson circulation: Experiments with the NCAR General Circulation Model;Pure Appld. Geophys. 115 1335–1356CrossRefGoogle Scholar
  99. Webster P J 1981 Mechanisms determining atmospheric response to sea surface temperature anomalies;J. Atmos. Sci. 38 554–571CrossRefGoogle Scholar
  100. Webster P J 1972 Response to tropical atmosphere to local, steady forcing;Mon. Weather Rev. 100 518–541CrossRefGoogle Scholar
  101. Webster P J and Yang S 1992 Monsoon and ENSO: Selectively interactive systems;Q. J. R. Meteorol. Soc. 118 877–926CrossRefGoogle Scholar
  102. White G 1982 An observational study of the northern hemisphere extratropical summertime general circulation;J. Atmos. Sci. 39 24–40CrossRefGoogle Scholar
  103. Wright P B 1977 The southern oscillation, patterns and the mechanisms of teleconnections and persistence;Hawaii Institute of Geophysics, Univ. of Hawaii, HIG-79-13, 107 ppGoogle Scholar
  104. Xue Y, Sellers P J, Kinter J and Shukla J 1991 A simplified biosphere model for global climate studies;J. Climate 4 345–364CrossRefGoogle Scholar
  105. Zwiers F W 1993 Simulation of the Asian summer monsoon with the CCC GCM-1;J. Climate 6 470–486CrossRefGoogle Scholar

Copyright information

© Indian Academy of Sciences 1998

Authors and Affiliations

  • R. Krishnan
    • 1
  • C. Venkatesan
    • 1
  • R. N. Keshavamurty
    • 1
  1. 1.Climate and Global Modelling DivisionIndian Institute of Tropical MeteorologyPuneIndia

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