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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 - PowerPoint PPT Presentation
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Modulation of the Extratropical Circulation by Combined Activity of the Madden–Julian Oscillation and Equatorial Rossby Waves
Lawrence C. Gloeckler and Dr. Paul E. RoundyDepartment of Atmospheric and Environmental Sciences, The University at Albany – SUNY
DAES Undergraduate Thesis Presentation2 May 2011Albany, NY
Overview
MJO Convection
Extratropical Rossby Waves
Equatorial Rossby Waves
Background Information
MJO Circulation
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).
MJO Circulation
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).
MJO Circulation
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).
ER Wave Development
EQ
300-hPa
ER Wave Development
EQ
300-hPa
ER Wave Development
EQ
300-hPa
ER Wave Development
EQ
300-hPa
ER Wave Development
EQ
300-hPa
Background Flow
Background Flow
ER Wave Development
EQ
300-hPa
ER Wave Development
EQ
300-hPa
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
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
Results: Hovmöllers
MJO OnlyRMM 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)
MJO OnlyRMM 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)
MJO OnlyRMM 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)
ER Wave OnlyRMM 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)
ER Wave OnlyRMM 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)
ER Wave OnlyRMM 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)
Sum of MJO and ER WaveRMM 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)
Sum of MJO and ER WaveRMM 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)
Sum of MJO and ER WaveRMM 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)
Sum of MJO and ER WaveRMM 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)
Sum of MJO and ER WaveRMM 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)
Simultaneous MJO and ER WaveRMM 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)
Simultaneous MJO and ER WaveRMM 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)
Simultaneous MJO and ER WaveRMM 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)
Simultaneous MJO and ER WaveRMM 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)
Simultaneous MJO and ER WaveRMM 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)
MJO OnlyRMM 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)
Simultaneous MJO and ER WaveRMM 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)
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
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
Results: Composites
MJO OnlyOLR, 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)
MJO OnlyOLR, 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)
MJO OnlyOLR, 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)
MJO OnlyOLR, 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)
MJO OnlyOLR, 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)
MJO OnlyOLR, 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)
MJO OnlyOLR, 300-hPa Height and Wind Anomaly, Lag = 1 day, RMM Phase 4OLR, 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)
MJO OnlyOLR, 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)
MJO OnlyOLR, 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)
MJO OnlyOLR, 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)
MJO OnlyOLR, 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)
ER Wave OnlyOLR, 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)
ER Wave OnlyOLR, 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)
ER Wave OnlyOLR, 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)
ER Wave OnlyOLR, 300-hPa Height and Wind Anomaly, Lag = –4 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)
ER Wave OnlyOLR, 300-hPa Height and Wind Anomaly, Lag = –3 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)
ER Wave OnlyOLR, 300-hPa Height and Wind Anomaly, Lag = –2 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)
ER Wave OnlyOLR, 300-hPa Height and Wind Anomaly, Lag = –1 day, 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)
ER Wave OnlyOLR, 300-hPa Height and Wind Anomaly, Lag = 0 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)
ER Wave OnlyOLR, 300-hPa Height and Wind Anomaly, Lag = 1 day, 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)
ER Wave OnlyOLR, 300-hPa Height and Wind Anomaly, Lag = 2 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)
ER Wave OnlyOLR, 300-hPa Height and Wind Anomaly, Lag = 3 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)
ER Wave OnlyOLR, 300-hPa Height and Wind Anomaly, Lag = 4 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)
ER Wave OnlyOLR, 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)
Simultaneous MJO/ER WaveOLR, 300-hPa Height and Wind Anomaly, Lag = –5 days, RMM Phase 4, 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 ± 2 m s-1)
Simultaneous MJO/ER WaveOLR, 300-hPa Height and Wind Anomaly, Lag = –4 days, RMM Phase 4, 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 ± 2 m s-1)
Simultaneous MJO/ER WaveOLR, 300-hPa Height and Wind Anomaly, Lag = –3 days, RMM Phase 4, 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 ± 2 m s-1)
Simultaneous MJO/ER WaveOLR, 300-hPa Height and Wind Anomaly, Lag = –2 days, RMM Phase 4, 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 ± 2 m s-1)
Simultaneous MJO/ER WaveOLR, 300-hPa Height and Wind Anomaly, Lag = –1 day, RMM Phase 4, 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 ± 2 m s-1)
Simultaneous MJO/ER WaveOLR, 300-hPa Height and Wind Anomaly, Lag = 0 days, RMM Phase 4, 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 ± 2 m s-1)
Simultaneous MJO/ER WaveOLR, 300-hPa Height and Wind Anomaly, Lag = 1 day, RMM Phase 4, 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 ± 2 m s-1)
Simultaneous MJO/ER WaveOLR, 300-hPa Height and Wind Anomaly, Lag = 2 days, RMM Phase 4, 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 ± 2 m s-1)
Simultaneous MJO/ER WaveOLR, 300-hPa Height and Wind Anomaly, Lag = 3 days, RMM Phase 4, 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 ± 2 m s-1)
Simultaneous MJO/ER WaveOLR, 300-hPa Height and Wind Anomaly, Lag = 4 days, RMM Phase 4, 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 ± 2 m s-1)
Simultaneous MJO/ER WaveOLR, 300-hPa Height and Wind Anomaly, Lag = 5 days, RMM Phase 4, 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 ± 2 m s-1)
Summary
MJO Convection
Extratropical Rossby Waves
Equatorial Rossby Waves
The Grand Conclusion
Simultaneous assessment of MJO and ER wave events yields more information about extratropical circulation than can be obtained from either field alone, or from simple linear combination of two fields
ER wave state during particular MJO phase might yield better empirical prediction of following global atmospheric circulation
Acknowledgments
A special thank you to: Dr. Paul Roundy for lending his time and
expertise to helping me develop and analyze my research problem
Kyle MacRitchie for allowing me to use several of his MATLAB scripts, and for helping me understand the many facets of MATLAB
Thank you!
Lawrence C. GloecklerDepartment of Atmospheric and Environmental SciencesUniversity at Albany – SUNYemail: [email protected]
QUESTIONS?
