Closed Anticyclones of the Subtropics and Midlatitudes: A 54-Yr Climatology (1950–2003) and Three Case Studies

  • Thomas J. GalarneauJr.
  • Lance F. Bosart
  • Anantha R. Aiyyer
Part of the Meteorological Monographs book series (METEOR, volume 33, No. 55)


The pioneering large-scale studies of cyclone frequency, location, and intensity conducted by Fred Sanders prompt similar questions about lesser-studied anticyclone development. The results of a climatology of closed anticyclones (CAs) at 200, 500, and 850 hPa, with an emphasis on the subtropics and midlatitudes, is presented to assess the seasonally varying distribution and hemispheric differences of these features. To construct the CA climatology, a counting program was applied to twice-daily 2.5° NCEP-NCAR reanalysis 200-, 500-, and 850-hPa geopotential height fields for the period 1950–2003. Stationary CAs, defined as those CAs that were located at a particular location for consecutive time periods, were counted only once.

The climatology results show that 200-hPa CAs occur preferentially during summer over subtropical continental regions, while 500-hPa CAs occur preferentially over subtropical oceans in all seasons and over subtropical continents in summer. Conversely, 850-hPa CAs occur preferentially over oceanic regions beneath upper-level midocean troughs, and are most prominent in the Northern Hemisphere, and over midlatitude continents in winter.

Three case studies of objectively identified CAs that produced heat waves over the United States, Europe, and Australia in 1995, 2003, and 2004, respectively, are presented to supplement the climatological results. The case studies, examining the subset of CAs than can produce heat waves, illustrate how climatologically hot continental tropical air masses produced over arid and semiarid regions of the subtropics and lower midlatitudes can become abnormally hot in conjunction with dynamically driven upper-level ridge amplification. Subsequently, these abnormally hot air masses are advected downstream away from their source regions in conjunction with transient disturbances embedded in anomalously strong westerly jets.


Heat Wave Storm Track Subtropical Anticyclone Heat Wave Event Solid Contour 


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  1. Alberta, T. L., S. J. Colucci, and J. C. Davenport, 1991: Rapid 500-mb cyclogenesis and anticyclogenesis. Mon. Wea. Rev., 119, 1186–1204.CrossRefGoogle Scholar
  2. Ambaum, M. H. P., B. J. Hoskins, and D. B. Stephenson, 2001: Arctic Oscillation or North Atlantic Oscillation? J. Climate, 14, 3495–3507.CrossRefGoogle Scholar
  3. Anderson, D., K. I. Hodges, and B. J. Hoskins, 2003: Sensitivity of feature-based analysis methods of storm tracks to the form of background field removal. Mon. Wea. Rev., 131, 565–573.CrossRefGoogle Scholar
  4. Baldi, M., M. Pasqui, F. Cesarone, and G. DeChiara, 2005: Heat waves in the Mediterranean region: Analysis and model results. Preprints, 16th Conf. on Climate Variability and Change, San Diego, CA, Amer. Meteor. Soc., P10.5.Google Scholar
  5. Bell, G. D., and L. F. Bosart, 1989: A 15-year climatology of Northern Hemisphere 500 mb closed cyclone and anticyclone centers. Mon. Wea. Rev., 117, 2142–2163.CrossRefGoogle Scholar
  6. Benedict, J. J., S. Lee, and S. B. Feldstein, 2004: Synoptic view of the North Atlantic Oscillation. J. Atmos. Sci., 61, 121–144.CrossRefGoogle Scholar
  7. Bjerknes, J., and H. Solberg, 1922: Life cycles of cyclones and the polar front theory of atmospheric circulations. Geophys. Publ., 3, 1–18.Google Scholar
  8. Black, E., M. Blackburn, G. Harrison, B. Hoskins, and J. Methven, 2004: Factors contributing to the summer 2003 European heatwave. Weather, 59, 217–223.CrossRefGoogle Scholar
  9. Blackmon, M. L., 1976: A climatological spectral study of the 500 mb geopotential height of the Northern Hemisphere. J. Atmos. Sci., 33, 1607–1623.CrossRefGoogle Scholar
  10. -, J. M. Wallace, N.-C. Lau, and S. L. Mullen, 1977: An observational study of the Northern Hemisphere wintertime circulation. J. Atmos. Sci., 34, 1040–1053.CrossRefGoogle Scholar
  11. -, S. L. Mullen, and G. T. Bates, 1986: The climatology of blocking events in a perpetual January simulation of a spectral general circulation model. J. Atmos. Sci., 43, 1379–1405.CrossRefGoogle Scholar
  12. Burt, S., 2004: The August 2003 heatwave in the United Kingdom. Part I: Maximum temperatures and historical precedents. Weather, 59, 199–208.CrossRefGoogle Scholar
  13. -, and P. Eden, 2004: The August 2003 heatwave in the United Kingdom. Part II: The hottest sites. Weather, 59, 239–246.CrossRefGoogle Scholar
  14. Cassou, C., L. Terray, and A. S. Phillips, 2005: Tropical Atlantic influence on European heat waves. J. Climate, 18, 2805–2811.CrossRefGoogle Scholar
  15. Ceppa, T. K., and S. J. Colucci, 1989: Predictability of 500 mb cyclones and anticyclones as a function of their persistence. Mon. Wea. Rev., 117, 887–900.CrossRefGoogle Scholar
  16. Chang, E. K. M., 1999: Characteristics of wave packets in the upper troposphere. Part II: Seasonal and hemispheric variations. J. Atmos. Sci., 56, 1729–1747.CrossRefGoogle Scholar
  17. -, and D. B. Yu, 1999: Characteristics of wave packets in the upper troposphere. Part I: Northern Hemisphere winter. J. Atmos. Sci., 56, 1708–1728.CrossRefGoogle Scholar
  18. Chang, F., and E. A. Smith, 2001: Hydrological and dynamical characteristics of summertime droughts over the U.S. Great Plains. J. Climate, 14, 2296–2316.CrossRefGoogle Scholar
  19. Changnon, S. A., K. E. Kunkel, and B. C. Reinke, 1996: Impacts and responses to the 1995 heat wave: A call to action. Bull. Amer. Meteor. Soc., 77, 1497–1506.CrossRefGoogle Scholar
  20. Chen, P., M. P. Hoerling, and R. M. Dole, 2001: The origin of the subtropical anticyclones. J. Atmos. Sci., 58, 1827–1835.CrossRefGoogle Scholar
  21. Chen, T.-C., 2005: Maintenance of the midtropospheric North African summer circulation: Saharan high and African easterly jet. J. Climate, 18, 2943–2962.CrossRefGoogle Scholar
  22. Cheng, X., and J. Wallace, 1993: Cluster analysis of the Northern Hemisphere winter 500-hPa height field: Spatial patterns. J. Atmos. Sci., 50, 2674–2696.CrossRefGoogle Scholar
  23. Colucci, S. J., 1985: Explosive cyclogenesis and large-scale circulation changes: Implications for atmospheric blocking. J. Atmos. Sci., 42, 2701–2717.CrossRefGoogle Scholar
  24. -, 2001: Planetary scale preconditioning for the onset of blocking. J. Atmos. Sci., 58, 933–942.CrossRefGoogle Scholar
  25. -, and D. P. Baumhefner, 1998: Numerical prediction of the onset of blocking: A case study with forecast ensembles. Mon. Wea. Rev., 126, 773–784.CrossRefGoogle Scholar
  26. Davis, R. E., B. P. Hayden, D. A. Gay, W. L. Phillips, and G. V. Jones, 1997: The North Atlantic subtropical anticyclone. J. Climate, 10, 728–744.CrossRefGoogle Scholar
  27. Donoghue, E. R., and Coauthors, 1995: Heat-related mortality—Chicago, July 1995. Morb. Mort. Week. Rep., 44, 577–579.Google Scholar
  28. Emanuel, K., 2008: Back to Norway. Synoptic-Dynamic Meteorology and Weather Analysis and Forecasting: A Tribute to Fred Sanders, Meteor. Monogr., No. 55, Amer. Meteor. Soc.Google Scholar
  29. Fink, A. H., T. Brücher, A. Krüger, G. C. Leckebusch, J. G. Pinto, and U. Ulbrich, 2004: The 2003 European summer heatwaves and drought-synoptic diagnosis and impacts. Weather, 59, 209–216.CrossRefGoogle Scholar
  30. Galarneau, T. J., Jr., and L. F. Bosart, 2006: Ridge rollers: Mesoscale disturbances on the periphery of cutoff anticyclones. Preprints, Symp. on Challenges of Severe Convective Storms, Atlanta, GA, Amer. Meteor. Soc., P1.11.Google Scholar
  31. Hao, W., and L. F. Bosart, 1987: A moisture budget analysis of the protracted heat wave in the southern Plains during the summer of 1980. Wea. Forecasting, 2, 269–288.CrossRefGoogle Scholar
  32. Hémon, D., E. Jougla, J. Clavel, F. Laurent, S. Bellec, and G. Pavillon, 2003: Surmortalité liée á la canicule d’août 2003 en France (High mortality during the heat wave in August 2003 in France). Bull. Epidemiol. Hebdomadaire, 45–46, 221–225.Google Scholar
  33. Hobbs, W. H., 1945: The Greenland glacial anticyclone. J. Meteor., 2, 143–153.CrossRefGoogle Scholar
  34. Hong, S., and E. Kalnay, 2002: The 1998 Oklahoma-Texas drought: Mechanistic experiments with NCEP global and regional models. J. Climate, 15, 945–963.CrossRefGoogle Scholar
  35. Hoskins, B., 1996: On the existence and strength of the summer subtropical anticyclones. Bull. Amer. Meteor. Soc., 77, 1287–1292.Google Scholar
  36. -, and K. I. Hodges, 2002: New perspectives of the Northern Hemisphere winter storm tracks. J. Atmos. Sci., 59, 1041–1061.CrossRefGoogle Scholar
  37. -, and K. I. Hodges, 2005: A new perspective on Southern Hemisphere storm tracks. J. Climate, 18, 4108–4129.CrossRefGoogle Scholar
  38. Iskendarian, H., 1995: A 10-year climatology of Northern Hemisphere tropical cloud plumes and their composite flow patterns. J. Climate, 8, 1630–1637.CrossRefGoogle Scholar
  39. Johnson, H., R. S. Kovats, G. McGregor, J. Stedman, M. Gibbs, H. Walton, L. Cook, and E. Black, 2005: The impact of the 2003 heat wave on mortality and hospital admissions in England. Health Stat. Quart., 25, 6–11.Google Scholar
  40. Jones, P. D., and A. Moberg, 2003: Hemispheric and large-scale surface air temperature variations: An extensive revision and an update to 2001. J. Climate, 16, 206–223.CrossRefGoogle Scholar
  41. Kalnay, E., and Coauthors, 1996: The NCEP/NCAR 40-Year Reanalysis Project. Bull. Amer. Meteor. Soc., 77, 437–472.CrossRefGoogle Scholar
  42. Kistler, R., and Coauthors, 2001: The NCEP-NCAR 50-Year Reanalysis: Monthly means CD-ROM and documentation. Bull. Amer. Meteor. Soc., 82, 247–267.CrossRefGoogle Scholar
  43. Klein, W. H., 1957: Principle tracks and mean frequencies of cyclones and anticyclones in the Northern Hemisphere. Research Paper 40, U.S. Weather Bureau, 60 pp.Google Scholar
  44. -, 1958: The frequency of cyclones and anticyclones in relation to the mean circulation. J. Meteor., 15, 98–102.CrossRefGoogle Scholar
  45. -, and J. Winston, 1958: Geographical frequency of troughs and ridges on mean 700-mb charts. Mon. Wea. Rev., 86, 60–70.CrossRefGoogle Scholar
  46. Klein Tank, A. M. G., and G. P. Können, 2003: Trends in indices of daily temperature and precipitation extremes in Europe, 1946–99. J. Climate, 16, 3665–3680.CrossRefGoogle Scholar
  47. Kunkel, K. E., S. A. Changnon, B. C. Reinke, and R. W. Arritt, 1996: The July 1995 heat wave in the Midwest: A climatic perspective and critical weather factors. Bull. Amer. Meteor. Soc., 77, 1507–1518.CrossRefGoogle Scholar
  48. Leighton, R. M., 1994: Relationship of anomalies of (anti)cyclonicity to some significant weather events over the Australian region. Aust. Meteor. Mag., 43, 255–261.Google Scholar
  49. -, and R. Deslandes, 1991: Monthly anticyclonicity and cyclonicity in the Australian region: Averages for January, April, July and October. Aust. Meteor. Mag., 39, 149–154.Google Scholar
  50. -, and H. Nowak, 1995: Variations in seasonal and annual anticyclonicity across the eastern Australian region during the 29-year period 1965–1993. Aust. Meteor. Mag., 44, 299–308.Google Scholar
  51. Lejenäs, H., and H. Økland, 1983: Characteristics of Northern Hemisphere blocking as determined from a long time series of observational data. Tellus, 35A, 350–362.CrossRefGoogle Scholar
  52. Le Marshall, J. F., G. A. M. Kelly, and D. J. Karoly, 1985: An atmospheric climatology of the southern hemisphere based on ten years of daily numerical analyses (1972–82). I: Overview. Aust. Meteor. Mag., 33, 65–85.Google Scholar
  53. Liu, Q., 1994: On the definition and persistence of blocking. Tellus, 46A, 286–298.Google Scholar
  54. Liu, Y., G. Wu, and R. Ren, 2004: Relationship between the subtropical anticyclone and diabatic heating. J. Climate, 17, 682–698.CrossRefGoogle Scholar
  55. Livezey, R. E., 1980: Weather and circulation of 1980—Climax of historical heat wave and drought over the United States. Mon. Wea. Rev., 108, 1708–1716.CrossRefGoogle Scholar
  56. -, and R. Tinker, 1996: Some meteorological, climatological, and microclimatological considerations of the severe U.S. heat wave of mid-July 1995. Bull. Amer. Meteor. Soc., 77, 2043–2054.CrossRefGoogle Scholar
  57. Lupo, A. R., and P. J. Smith, 1998: The interactions between a midlatitude blocking anticyclone and synoptic-scale cyclones that occurred during the summer season. Mon. Wea. Rev., 126, 502–515.CrossRefGoogle Scholar
  58. -, and L. F. Bosart, 1999: An analysis of a relatively rare case of continental blocking. Quart. J. Roy. Meteor. Soc., 125, 107–138.CrossRefGoogle Scholar
  59. Lyon, B., and R. M. Dole, 1995: A diagnostic comparison of the 1980 and 1988 U.S. summer heat wave-droughts. J. Climate, 8, 1658–1675.CrossRefGoogle Scholar
  60. McGuirk, J. P., A. H. Thompson, and N. R. Smith, 1987: Moisture bursts over the tropical Pacific Ocean. Mon. Wea. Rev., 115, 787–798.CrossRefGoogle Scholar
  61. -,-, and J. R. Schaeffer, 1988: An eastern Pacific tropical plume. Mon. Wea. Rev., 116, 2505–2521.CrossRefGoogle Scholar
  62. Miyasaka, T., and H. Nakamura, 2005: Structure and formation mechanisms of the Northern Hemisphere summertime subtropical highs. J. Climate, 18, 5046–5065.CrossRefGoogle Scholar
  63. Mullen, S. L., 1986: The local balances of vorticity and heat for blocking anticyclones in a spectral general circulation model. J. Atmos. Sci., 43, 1406–1441.CrossRefGoogle Scholar
  64. -, 1987: Transient eddy forcing of blocking flows. J. Atmos. Sci., 44, 3–22.CrossRefGoogle Scholar
  65. -, 1989: The impact of orography on blocking frequency in a general circulation model. J. Climate, 2, 1554–1560.CrossRefGoogle Scholar
  66. Namias, J., 1955: Some meteorological aspects of drought: With special reference to the summers of 1952–54 over the United States. Mon. Wea. Rev., 83, 199–205.CrossRefGoogle Scholar
  67. -, 1982: Anatomy of Great Plains protracted heat waves (especially the 1980 U.S. summer drought). Mon. Wea. Rev., 110, 824–838.CrossRefGoogle Scholar
  68. -, 1991: Spring and summer 1988 drought over the contiguous United States—Causes and prediction. J. Climate, 4, 54–65.CrossRefGoogle Scholar
  69. Nashold, R., P. Remington, P. Peterson, J. Jentzen, and R. Kapella, 1996: Heat-wave-related mortality—Milwaukee, Wisconsin, July 1995. Morb. Mort. Week. Rep., 45, 505–507.Google Scholar
  70. Nkemdirim, L., and L. Weber, 1999: Comparison between the droughts of the 1930s and the 1980s in the southern prairies of Canada. J. Climate, 12, 2434–2450.CrossRefGoogle Scholar
  71. NOAA, 1955: Natural Disaster Survey Report: July 1995 heat wave. National Oceanic and Atmospheric Administration, 52 pp. [Available from the U. S. Dept. of Commerce, National Weather Service, 1325 East-West Highway, Silver Spring, MD, 20910.]Google Scholar
  72. Palecki, M. A., S. A. Changnon, and K. E. Kunkel, 2001: The nature and impacts of the July 1999 heat wave in the Midwestern United States: Learning from the lessons of 1995. Bull. Amer. Meteor. Soc., 82, 1353–1367.CrossRefGoogle Scholar
  73. Parker, S. S., J. T. Hawes, S. J. Colucci, and B. P. Hayden, 1989: Climatology of 500 mb cyclones and anticyclones, 1950–1985. Mon. Wea. Rev., 117, 558–570.CrossRefGoogle Scholar
  74. Pelly, J. L., and B. J. Hoskins, 2003a: A new perspective on blocking. J. Atmos. Sci., 60, 743–755.CrossRefGoogle Scholar
  75. -, and-, 2003b: How well does the ECMWF Ensemble Prediction System predict blocking? Quart. J. Roy. Meteor. Soc., 129, 1683–1702.CrossRefGoogle Scholar
  76. Petterssen, S., 1956: Motion and Motion Systems. Vol. 2., Weather Analysis and Forecasting, McGraw-Hill, 428 pp.Google Scholar
  77. Pezza, A. B., and T. Ambrizzi, 2003: Variability of Southern Hemisphere cyclone and anticyclone behavior: Further analysis. J. Climate, 16, 1075–1083.CrossRefGoogle Scholar
  78. Pirard, P., S. Vandentorren, M. Pascal, K. Laaidi, A. Le Tertre, S. Cassadou, and M. Ledrans, 2005: Summary of the mortality impact assessment of the 2003 heat wave in France. Euro Surveill., 10 (7), 153–156. [Available online at http://www.]Google Scholar
  79. Rex, D. F., 1950a: Blocking action in the middle troposphere and its effects on regional climate. I: An aerological study of blocking action. Tellus, 2, 196–211.CrossRefGoogle Scholar
  80. -, 1950b: Blocking action in the middle troposphere westerlies and its effects on regional climate. II: The climatology of blocking action. Tellus, 2, 1577–1589.Google Scholar
  81. Rodwell, M. J., and B. J. Hoskins, 1996: Monsoons and the dynamics of deserts. Quart. J. Roy. Meteor. Soc., 122, 1385–1404.CrossRefGoogle Scholar
  82. -, and-, 2001: Subtropical anticyclones and summer monsoons. J. Climate, 14, 3192–3211.CrossRefGoogle Scholar
  83. Roebber, P. J., 1984: Statistical analysis and updated climatology of explosive cyclones. Mon. Wea. Rev., 112, 1577–1589.CrossRefGoogle Scholar
  84. Sadler, J. C., 1967: The tropical upper tropospheric trough as a secondary source of typhoons and a primary source of trade wind disturbances. Hawaii Institute of Geophysics Rep. 67-12, 44 pp. [Available from Dept. of Meteorology, University of Hawaii at Manoa, Honolulu, HI 96822.]Google Scholar
  85. -, 1976: A role of the tropical upper tropospheric trough in early season typhoon development. Mon. Wea. Rev., 104, 1266–1278.CrossRefGoogle Scholar
  86. Sanders, F., 1988: Life history of mobile troughs in the upper westerlies. Mon. Wea. Rev., 116, 2629–2648.CrossRefGoogle Scholar
  87. -, and J. R. Gyakum, 1980: Synoptic-dynamic climatology of the “bomb.” Mon. Wea. Rev., 108, 1589–1606.CrossRefGoogle Scholar
  88. -, and C. A. Davis, 1988: Patterns of thickness anomaly for explosive cyclogenesis over the west-central North Atlantic Ocean. Mon. Wea. Rev., 116, 2725–2730.CrossRefGoogle Scholar
  89. -, and S. L. Mullen, 1996: The climatology of explosive cyclogenesis in two general circulation models. Mon. Wea. Rev., 124, 1948–1954.CrossRefGoogle Scholar
  90. Schubert, S. D., and Coauthors, 1995: A multiyear assimilation with the GEOS-1 system: Overview and results. NASA Tech. Memo. 104606, Vol. 6, 183 pp.Google Scholar
  91. -, M. J. Suarez, P. J. Pegion, R. D. Koster, and J. T. Bacmeister, 2004: On the cause of the 1930s dust bowl. Science, 303, 1855–1859.CrossRefGoogle Scholar
  92. Shaffrey, L. C., B. J. Hoskins, and R. Lu, 2002: The relationship between the North American summer monsoon, the Rocky Mountains and the North Pacific subtropical anticyclone in HadAM3. Quart. J. Roy. Meteor. Soc., 128, 2607–2622.CrossRefGoogle Scholar
  93. Sinclair, M. R., 1994: An objective cyclone climatology for the Southern Hemisphere. Mon. Wea. Rev., 122, 2239–2256.CrossRefGoogle Scholar
  94. -, 1995: Climatology of cyclogenesis for the Southern Hemisphere. Mon. Wea. Rev., 123, 1601–1619.CrossRefGoogle Scholar
  95. -, 1996: A climatology of anticyclones and blocking for the Southern Hemisphere. Mon. Wea. Rev., 124, 245–263.CrossRefGoogle Scholar
  96. -, J. A. Renwick, and J. W. Kidson, 1997: Low-frequency variability of Southern Hemisphere sea level pressure and weather system activity. Mon. Wea. Rev., 125, 2531–2543.CrossRefGoogle Scholar
  97. Taljaard, J. J., 1967: Development, distribution, and movement of cyclones and anticyclones in the Southern Hemisphere during the IGY. J. Appl. Meteor., 6, 973–987.CrossRefGoogle Scholar
  98. Thompson, D. W. J., and J. M. Wallace, 2000: Annular modes in the extratropical circulation. Part I: Month-to-month variability. J. Climate, 13, 1000–1016.CrossRefGoogle Scholar
  99. -,-, and G. C. Hegerl, 2000: Annular modes in the extratropical circulation. Part II: Trends. J. Climate, 13, 1018–1036.CrossRefGoogle Scholar
  100. Trenberth, K. E., 1991: Storm tracks in the Southern Hemisphere. J. Atmos. Sci., 48, 2159–2178.CrossRefGoogle Scholar
  101. -, and K. C. Mo, 1985: Blocking in the Southern Hemisphere. Mon. Wea. Rev., 113, 3–21.CrossRefGoogle Scholar
  102. -, and G. W. Branstator, 1992: Issues in establishing causes of the 1988 drought over North America. J. Climate, 5, 159–172.CrossRefGoogle Scholar
  103. -,-, and P. A. Arkin, 1988: Origins of the 1988 North American drought. Science, 242, 1640–1645.CrossRefGoogle Scholar
  104. -, D. P. Stepaniak, and J. M. Caron, 2002: Accuracy of atmospheric energy budgets from analyses. J. Climate, 15, 3343–3360.CrossRefGoogle Scholar
  105. Wallace, J. M., G.-H. Lim, and M. L. Blackmon, 1988: Relationship between cyclones tracks, anticyclone tracks, and baroclinic waveguides. J. Atmos. Sci., 45, 439–462.CrossRefGoogle Scholar
  106. Wiedenmann, J. M., A. R. Lupo, I. I. Mokhov, and E. A. Tikhonova, 2002: The climatology of blocking anticyclones for the Northern and Southern Hemispheres: Block intensity as a diagnostic. J. Climate, 15, 3459–3473.CrossRefGoogle Scholar
  107. Zishka, K. M., and P. J. Smith, 1980: The climatology of cyclones and anticyclones over North America and surrounding ocean environs for January and July, 1950–77. Mon. Wea. Rev., 108, 387–401.CrossRefGoogle Scholar

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© American Meteorological Society 2008

Authors and Affiliations

  • Thomas J. GalarneauJr.
    • 1
  • Lance F. Bosart
    • 1
  • Anantha R. Aiyyer
    • 1
  1. 1.Department of Earth and Atmospheric SciencesUniversity at Albany, State University of New YorkAlbanyUSA

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