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Lawrence C. Gloeckler and Dr. Paul E. Roundy

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

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Lawrence C. Gloeckler and Dr. Paul E. Roundy

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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 Dr. Paul E. Roundy Department of Atmospheric and Environmental Sciences, The University at Albany – SUNY DAES Undergraduate Thesis Presentation 2 May 2011 Albany, NY

  2. Overview MJO Convection Equatorial Rossby Waves Extratropical Rossby Waves

  3. Background Information

  4. 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).

  5. MJO Circulation H MJO H 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).

  6. MJO Circulation H L MJO L H 300-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).

  7. ER Wave Development MJO EQ 300-hPa

  8. ER Wave Development H MJO EQ H 300-hPa

  9. ER Wave Development L H MJO EQ H L 300-hPa

  10. ER Wave Development H L H MJO EQ H H L 300-hPa

  11. ER Wave Development H L H Background Flow MJO EQ Background Flow H H L 300-hPa

  12. ER Wave Development H L H L MJO EQ L H H L 300-hPa

  13. ER Wave Development H L H L MJO EQ L H H L 300-hPa

  14. Data and Methodology Analyzed satellite-derived OLR data and NCEP—NCAR 40-year reanalysis data pertaining to 300-hPa geopotential height and wind anomalies Identified set of dates during NH winter (1 Nov–31 Mar) when MJO was located over Maritime Continent Position over Maritime Continent consistent with RMM Phase 4

  15. Data and Methodology Identified longitude where ER wave crossing occurred most frequently for RMM Phase 4 Developed set of dates in which ER waves crossed identified longitude

  16. Results: Hovmöllers

  17. MJO Only RMM Phase 4 OLR (shaded between 7.5°S and 7.5°N; W m-2) and 300-hPa geopotential height anomaly (contoured between 40°N and 50°N; red=positive, blue=negative)

  18. MJO Only RMM Phase 4 OLR (shaded between 7.5°S and 7.5°N; W m-2) and 300-hPa geopotential height anomaly (contoured between 40°N and 50°N; red=positive, blue=negative)

  19. MJO Only RMM Phase 4 OLR (shaded between 7.5°S and 7.5°N; W m-2) and 300-hPa geopotential height anomaly (contoured between 40°N and 50°N; red=positive, blue=negative)

  20. ER Wave Only RMM Phase 4, ER Base Lon 155E OLR (shaded between 7.5°S and 7.5°N; W m-2) and 300-hPa geopotential height anomaly (contoured between 40°N and 50°N; red=positive, blue=negative)

  21. ER Wave Only RMM Phase 4, ER Base Lon 155E OLR (shaded between 7.5°S and 7.5°N; W m-2) and 300-hPa geopotential height anomaly (contoured between 40°N and 50°N; red=positive, blue=negative)

  22. ER Wave Only RMM Phase 4, ER Base Lon 155E OLR (shaded between 7.5°S and 7.5°N; W m-2) and 300-hPa geopotential height anomaly (contoured between 40°N and 50°N; red=positive, blue=negative)

  23. Sum of MJO and ER Wave RMM Phase 4, ER Base Lon 155E OLR (shaded between 7.5°S and 7.5°N; W m-2) and 300-hPa geopotential height anomaly (contoured between 40°N and 50°N; red=positive, blue=negative)

  24. Sum of MJO and ER Wave RMM Phase 4, ER Base Lon 155E OLR (shaded between 7.5°S and 7.5°N; W m-2) and 300-hPa geopotential height anomaly (contoured between 40°N and 50°N; red=positive, blue=negative)

  25. Sum of MJO and ER Wave RMM Phase 4, ER Base Lon 155E OLR (shaded between 7.5°S and 7.5°N; W m-2) and 300-hPa geopotential height anomaly (contoured between 40°N and 50°N; red=positive, blue=negative)

  26. Sum of MJO and ER Wave RMM Phase 4, ER Base Lon 155E OLR (shaded between 7.5°S and 7.5°N; W m-2) and 300-hPa geopotential height anomaly (contoured between 40°N and 50°N; red=positive, blue=negative)

  27. Sum of MJO and ER Wave RMM Phase 4, ER Base Lon 155E OLR (shaded between 7.5°S and 7.5°N; W m-2) and 300-hPa geopotential height anomaly (contoured between 40°N and 50°N; red=positive, blue=negative)

  28. Simultaneous MJO and ER Wave RMM Phase 4, ER Base Lon 155E OLR (shaded between 7.5°S and 7.5°N; W m-2) and 300-hPa geopotential height anomaly (contoured between 40°N and 50°N; red=positive, blue=negative)

  29. Simultaneous MJO and ER Wave RMM Phase 4, ER Base Lon 155E OLR (shaded between 7.5°S and 7.5°N; W m-2) and 300-hPa geopotential height anomaly (contoured between 40°N and 50°N; red=positive, blue=negative)

  30. Simultaneous MJO and ER Wave RMM Phase 4, ER Base Lon 155E OLR (shaded between 7.5°S and 7.5°N; W m-2) and 300-hPa geopotential height anomaly (contoured between 40°N and 50°N; red=positive, blue=negative)

  31. Simultaneous MJO and ER Wave RMM Phase 4, ER Base Lon 155E OLR (shaded between 7.5°S and 7.5°N; W m-2) and 300-hPa geopotential height anomaly (contoured between 40°N and 50°N; red=positive, blue=negative)

  32. Simultaneous MJO and ER Wave RMM Phase 4, ER Base Lon 155E OLR (shaded between 7.5°S and 7.5°N; W m-2) and 300-hPa geopotential height anomaly (contoured between 40°N and 50°N; red=positive, blue=negative)

  33. MJO Only RMM Phase 4 OLR (shaded between 7.5°S and 7.5°N; W m-2) and 300-hPa geopotential height anomaly (contoured between 40°N and 50°N; red=positive, blue=negative)

  34. Simultaneous MJO and ER Wave RMM Phase 4, ER Base Lon 155E OLR (shaded between 7.5°S and 7.5°N; W m-2) and 300-hPa geopotential height anomaly (contoured between 40°N and 50°N; red=positive, blue=negative)

  35. Significance Test • Randomly selected a list of dates associated with RMM phase 4 equal to number of ER wave events counted at identified base point • Developed composite MJO with same number of degrees of freedom associated with combined composite • Generated composite for random dates and repeated 1,000 times • Compared composite result to composite generated by randomly selecting ER wave events during RMM phase 4

  36. Significance Test • Determined mean amplitude of random MJO composite is approximately one half mean amplitude of simultaneous composite between 40°N and 50°N • Two distributions demonstrated mean amplitude differences significantly larger than zero at 95% confidence level

  37. Results: Composites

  38. MJO Only OLR, 300-hPa Height and Wind Anomaly, Lag = –5 days, RMM Phase 4 Positive 300-hPa height anomaly (20 dam intervals) Negative 300-hPa height anomaly (20 dam intervals) u/v wind anomaly (magnitude exceeding ± 2 m s-1)

  39. MJO Only OLR, 300-hPa Height and Wind Anomaly, Lag = –4 days, RMM Phase 4 Positive 300-hPa height anomaly (20 dam intervals) Negative 300-hPa height anomaly (20 dam intervals) u/v wind anomaly (magnitude exceeding ± 2 m s-1)

  40. MJO Only OLR, 300-hPa Height and Wind Anomaly, Lag = –3 days, RMM Phase 4 Positive 300-hPa height anomaly (20 dam intervals) Negative 300-hPa height anomaly (20 dam intervals) u/v wind anomaly (magnitude exceeding ± 2 m s-1)

  41. MJO Only OLR, 300-hPa Height and Wind Anomaly, Lag = –2 days, RMM Phase 4 Positive 300-hPa height anomaly (20 dam intervals) Negative 300-hPa height anomaly (20 dam intervals) u/v wind anomaly (magnitude exceeding ± 2 m s-1)

  42. MJO Only OLR, 300-hPa Height and Wind Anomaly, Lag = –1 day, RMM Phase 4 Positive 300-hPa height anomaly (20 dam intervals) Negative 300-hPa height anomaly (20 dam intervals) u/v wind anomaly (magnitude exceeding ± 2 m s-1)

  43. MJO Only OLR, 300-hPa Height and Wind Anomaly, Lag = 0 days, RMM Phase 4 Positive 300-hPa height anomaly (20 dam intervals) Negative 300-hPa height anomaly (20 dam intervals) u/v wind anomaly (magnitude exceeding ± 2 m s-1)

  44. MJO Only OLR, 300-hPa Height and Wind Anomaly, Lag = 1 day, RMM Phase 4 OLR, 300-hPa Height and Wind Anomaly, Lag = 1 days, RMM Phase 4 Positive 300-hPa height anomaly (20 dam intervals) Negative 300-hPa height anomaly (20 dam intervals) u/v wind anomaly (magnitude exceeding ± 2 m s-1)

  45. MJO Only OLR, 300-hPa Height and Wind Anomaly, Lag = 2 days, RMM Phase 4 Positive 300-hPa height anomaly (20 dam intervals) Negative 300-hPa height anomaly (20 dam intervals) u/v wind anomaly (magnitude exceeding ± 2 m s-1)

  46. MJO Only OLR, 300-hPa Height and Wind Anomaly, Lag = 3 days, RMM Phase 4 Positive 300-hPa height anomaly (20 dam intervals) Negative 300-hPa height anomaly (20 dam intervals) u/v wind anomaly (magnitude exceeding ± 2 m s-1)

  47. MJO Only OLR, 300-hPa Height and Wind Anomaly, Lag = 4 days, RMM Phase 4 Positive 300-hPa height anomaly (20 dam intervals) Negative 300-hPa height anomaly (20 dam intervals) u/v wind anomaly (magnitude exceeding ± 2 m s-1)

  48. MJO Only OLR, 300-hPa Height and Wind Anomaly, Lag = 5 days, RMM Phase 4 Positive 300-hPa height anomaly (20 dam intervals) Negative 300-hPa height anomaly (20 dam intervals) u/v wind anomaly (magnitude exceeding ± 2 m s-1)

  49. ER Wave Only OLR, 300-hPa Height and Wind Anomaly, Lag = –5 days, ER Base Lon 155E Positive 300-hPa height anomaly (20 dam intervals) Negative 300-hPa height anomaly (20 dam intervals) u/v wind anomaly (magnitude exceeding ± 1 m s-1)

  50. ER Wave Only OLR, 300-hPa Height and Wind Anomaly, Lag = –5 days, ER Base Lon 155E Positive 300-hPa height anomaly (20 dam intervals) Negative 300-hPa height anomaly (20 dam intervals) u/v wind anomaly (magnitude exceeding ± 1 m s-1)

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