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Lawrence C. Gloeckler and Paul E. Roundy Department of Atmospheric and Environmental Sciences

Modulation of the Extratropical Circulation By Combined Activity of the Madden–Julian Oscillation and Equatorial Rossby Waves. Lawrence C. Gloeckler and Paul E. Roundy Department of Atmospheric and Environmental Sciences University at Albany, Albany, New York

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Lawrence C. Gloeckler and Paul E. Roundy Department of Atmospheric and Environmental Sciences

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  1. Modulation of the Extratropical Circulation By Combined Activity of the Madden–Julian Oscillation and Equatorial Rossby Waves Lawrence C. Gloeckler and Paul E. Roundy Department of Atmospheric and Environmental Sciences University at Albany,Albany, New York 30th Conference on Hurricanes and Tropical Meteorology Sawgrass Marriott Resort Ponte Vedra Beach, Florida 20 April 2012 lgloeckler@albany.edu||proundy@albany.edu

  2. Three-way Feedback MJO Convection Equatorial Rossby Waves Extratropical Rossby Waves

  3. MJO Circulation MJO 200-hPa streamfunction (contoured every 10 × 105 m2 s−1), total wind (vectors in m s−1), and MJO-filtered Outgoing Longwave Radiation (OLR) anomaly (shaded < −16 W m−2). Adapted from Fig. 2b of Kiladis et al. (2005).

  4. MJO Circulation H JET MJO EQ JET H 300-hPa

  5. MJO Circulation L H JET MJO EQ JET H L 300-hPa

  6. MJO Circulation L H H JET MJO EQ JET H L H 300-hPa

  7. MJO Circulation L H H JET L MJO EQ L JET H L H 300-hPa

  8. MJO Circulation L H H L MJO EQ L H L H 300-hPa

  9. Data and Methodology • Analyzed satellite derived OLR data and NCEP—NCAR geopotential height and wind 40 year reanalysis data • Anomalies generated by subtracting annual cycle and first four harmonics • Identified a set of dates when the MJO was in RMM phase 4 • Identified longitude at which ER wave crossings occurred most frequently, and found dates of ER filtered OLR minima at longitude • Generated composites based on MJO, ER, and simultaneous MJO and ER signals

  10. Results ER ONLY 30 20 • OLR composite anomaly averaged 7.5°S–7.5°N (shaded) • 300-hPa geopotential height anomaly averaged 40°N–50°N (contoured every 20 m starting at 20 m; red=positive, blue=negative) 10 10 Time Lag (days) -10 -20 -30 60E 180 60W -10 10 20 -30 10 -20 30 W m-2

  11. Results MJO ONLY 30 20 • OLR composite anomaly averaged 7.5°S–7.5°N (shaded) • 300-hPa geopotential height anomaly averaged 40°N–50°N (contoured every 20 m starting at 20 m; red=positive, blue=negative) 10 10 Time Lag (days) -10 -20 -30 60E 180 60W -10 10 20 -30 10 -20 30 W m-2

  12. Results SUM ER & MJO 30 20 • OLR composite anomaly averaged 7.5°S–7.5°N (shaded) • 300-hPa geopotential height anomaly averaged 40°N–50°N (contoured every 20 m starting at 20 m; red=positive, blue=negative) 10 10 Time Lag (days) -10 -20 -30 60E 180 60W -10 10 20 -30 10 -20 30 W m-2

  13. Results SIMULTANEOUS 30 20 • OLR composite anomaly averaged 7.5°S–7.5°N (shaded) • 300-hPa geopotential height anomaly averaged 40°N–50°N (contoured every 20 m starting at 20 m; red=positive, blue=negative) 10 10 Time Lag (days) -10 -20 -30 60E 180 60W -10 10 20 -30 10 -20 30 W m-2

  14. Results ER ONLY MJO ONLY SUM ER & MJO SIMULTANEOUS 30 20 10 10 Time Lag (days) -10 -20 -30 60E 180 60W 60E 180 60W 60E 180 60W 60E 180 60W -10 10 20 -30 10 -20 30 W m-2

  15. Composites – ER Only OLR, 300-hPa Height and Wind Anomaly, ER Base Longitude=157.5E, Lag=Day -5 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  16. Composites – ER Only OLR, 300-hPa Height and Wind Anomaly, ER Base Longitude=157.5E, Lag=Day -4 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  17. Composites – ER Only OLR, 300-hPa Height and Wind Anomaly, ER Base Longitude=157.5E, Lag=Day -3 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  18. Composites – ER Only OLR, 300-hPa Height and Wind Anomaly, ER Base Longitude=157.5E, Lag=Day -2 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  19. Composites – ER Only OLR, 300-hPa Height and Wind Anomaly, ER Base Longitude=157.5E, Lag=Day -1 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  20. Composites – ER Only OLR, 300-hPa Height and Wind Anomaly, ER Base Longitude=157.5E, Lag=Day 0 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  21. Composites – ER Only OLR, 300-hPa Height and Wind Anomaly, ER Base Longitude=157.5E, Lag=Day 1 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  22. Composites – ER Only OLR, 300-hPa Height and Wind Anomaly, ER Base Longitude=157.5E, Lag=Day 2 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  23. Composites – ER Only OLR, 300-hPa Height and Wind Anomaly, ER Base Longitude=157.5E, Lag=Day 3 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  24. Composites – ER Only OLR, 300-hPa Height and Wind Anomaly, ER Base Longitude=157.5E, Lag=Day 4 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  25. Composites – ER Only OLR, 300-hPa Height and Wind Anomaly, ER Base Longitude=157.5E, Lag=Day 5 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  26. Composites – MJO Only OLR, 300-hPa Height and Wind Anomaly, RMM=4, Lag=Day -5 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  27. Composites – MJO Only OLR, 300-hPa Height and Wind Anomaly, RMM=4, Lag=Day -4 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  28. Composites – MJO Only OLR, 300-hPa Height and Wind Anomaly, RMM=4, Lag=Day -3 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  29. Composites – MJO Only OLR, 300-hPa Height and Wind Anomaly, RMM=4, Lag=Day -2 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  30. Composites – MJO Only OLR, 300-hPa Height and Wind Anomaly, RMM=4, Lag=Day -1 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  31. Composites – MJO Only OLR, 300-hPa Height and Wind Anomaly, RMM=4, Lag=Day 0 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  32. Composites – MJO Only OLR, 300-hPa Height and Wind Anomaly, RMM=4, Lag=Day 1 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  33. Composites – MJO Only OLR, 300-hPa Height and Wind Anomaly, RMM=4, Lag=Day 2 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  34. Composites – MJO Only OLR, 300-hPa Height and Wind Anomaly, RMM=4, Lag=Day 3 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  35. Composites – MJO Only OLR, 300-hPa Height and Wind Anomaly, RMM=4, Lag=Day 4 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  36. Composites – MJO Only OLR, 300-hPa Height and Wind Anomaly, RMM=4, Lag=Day 5 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  37. Composites – ER and MJO OLR, 300-hPa Height and Wind Anomaly, RMM=4, ER Base Longitude=157.5E, Lag=Day -5 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  38. Composites – ER and MJO OLR, 300-hPa Height and Wind Anomaly, RMM=4, ER Base Longitude=157.5E, Lag=Day -4 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  39. Composites – ER and MJO OLR, 300-hPa Height and Wind Anomaly, RMM=4, ER Base Longitude=157.5E, Lag=Day -3 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  40. Composites – ER and MJO OLR, 300-hPa Height and Wind Anomaly, RMM=4, ER Base Longitude=157.5E, Lag=Day -2 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  41. Composites – ER and MJO OLR, 300-hPa Height and Wind Anomaly, RMM=4, ER Base Longitude=157.5E, Lag=Day -1 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  42. Composites – ER and MJO OLR, 300-hPa Height and Wind Anomaly, RMM=4, ER Base Longitude=157.5E, Lag=Day 0 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  43. Composites – ER and MJO OLR, 300-hPa Height and Wind Anomaly, RMM=4, ER Base Longitude=157.5E, Lag=Day 1 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  44. Composites – ER and MJO OLR, 300-hPa Height and Wind Anomaly, RMM=4, ER Base Longitude=157.5E, Lag=Day 2 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  45. Composites – ER and MJO OLR, 300-hPa Height and Wind Anomaly, RMM=4, ER Base Longitude=157.5E, Lag=Day 3 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  46. Composites – ER and MJO OLR, 300-hPa Height and Wind Anomaly, RMM=4, ER Base Longitude=157.5E, Lag=Day 4 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  47. Composites – ER and MJO OLR, 300-hPa Height and Wind Anomaly, RMM=4, ER Base Longitude=157.5E, Lag=Day 5 60N 40N 20N 0 20S 0 60E 180 120W 120E 60W -10 10 20 -30 10 -20 30 W m-2

  48. Conclusion • Separate ER wave and MJO composites demonstrate importance of assessing ER wave events relative to MJO • Sum of two sets of events yields little additional information about extratropical circulation than MJO alone • Simultaneous assessment of MJO and ER wave events yields more information about extratropical circulation than can be obtained from either mode alone

  49. Conclusion MJO Convection Equatorial Rossby Waves Extratropical Rossby Waves

  50. Thank You Lawrence C. Gloeckler and Paul E. Roundy Department of Atmospheric and Environmental Sciences University at Albany, Albany, NY Lgloeckler@albany.edu||Roundy@atmos.albany.edu http://www.atmos.albany.edu/student/lgloeckl/ www.atmos.albany.edu/facstaff/roundy/

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