lawrence c. gloeckler and paul e. roundy department of atmospheric and environmental sciences
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
Modulation of the Extratropical Circulation By Combined Activity of the Madden–Julian Oscillation and Equatorial Rossby Waves
Lawrence C. Gloeckler and Paul E. RoundyDepartment of Atmospheric and Environmental Sciences
University at Albany, Albany, New York
30th Conference on Hurricanes and Tropical MeteorologySawgrass Marriott Resort
Ponte Vedra Beach, Florida20 April 2012
Three-way Feedback
MJO Convection
Extratropical Rossby Waves
Equatorial Rossby Waves
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).
EQMJO
300-hPa
MJO Circulation
JET
JET
EQMJO
300-hPa
MJO Circulation
JET
JET
EQMJO
300-hPa
MJO Circulation
JET
JET
EQMJO
300-hPa
MJO Circulation
JET
JET
EQMJO
300-hPa
MJO Circulation
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
ResultsER ONLY
•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)
Tim
e La
g (d
ays)
30
20
10
10
-10
-20
-30
30-30 10-20 -10 10 20
60E 180 60W
W m-2
ResultsMJO ONLY
•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)
30-30 10-20 -10 10 20
Tim
e La
g (d
ays)
30
20
10
10
-10
-20
-30 60E 180 60W
W m-2
ResultsSUM ER & MJO
•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)
30-30 10-20 -10 10 20
Time Lag (days)
30
20
10
10
-10
-20
-3060E 180 60W
W m-2
ResultsSIMULTANEOUS
•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)
30-30 10-20 -10 10 20
Time Lag (days)
30
20
10
10
-10
-20
-3060E 180 60W
W m-2
ResultsSIMULTANEOUSER ONLY MJO ONLY SUM ER & MJO
30-30 10-20 -10 10 20
Tim
e La
g (d
ays)
30
20
10
10
-10
-20
-30 60E 180 60W 60E 180 60W 60E 180 60W 60E 180 60W
W m-2
Composites – ER Only
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, ER Base Longitude=157.5E, Lag=Day -5
Composites – ER Only
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, ER Base Longitude=157.5E, Lag=Day -4
Composites – ER Only
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, ER Base Longitude=157.5E, Lag=Day -3
Composites – ER Only
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, ER Base Longitude=157.5E, Lag=Day -2
Composites – ER Only
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, ER Base Longitude=157.5E, Lag=Day -1
Composites – ER Only
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, ER Base Longitude=157.5E, Lag=Day 0
Composites – ER Only
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, ER Base Longitude=157.5E, Lag=Day 1
Composites – ER Only
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, ER Base Longitude=157.5E, Lag=Day 2
Composites – ER Only
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, ER Base Longitude=157.5E, Lag=Day 3
Composites – ER Only
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, ER Base Longitude=157.5E, Lag=Day 4
Composites – ER Only
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, ER Base Longitude=157.5E, Lag=Day 5
Composites – MJO Only
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, RMM=4, Lag=Day -5
Composites – MJO Only
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, RMM=4, Lag=Day -4
Composites – MJO Only
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, RMM=4, Lag=Day -3
Composites – MJO Only
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, RMM=4, Lag=Day -2
Composites – MJO Only
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, RMM=4, Lag=Day -1
Composites – MJO Only
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, RMM=4, Lag=Day 0
Composites – MJO Only
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, RMM=4, Lag=Day 1
Composites – MJO Only
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, RMM=4, Lag=Day 2
Composites – MJO Only
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, RMM=4, Lag=Day 3
Composites – MJO Only
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, RMM=4, Lag=Day 4
Composites – MJO Only
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, RMM=4, Lag=Day 5
Composites – ER and MJO
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, RMM=4, ER Base Longitude=157.5E, Lag=Day -5
Composites – ER and MJO
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, RMM=4, ER Base Longitude=157.5E, Lag=Day -4
Composites – ER and MJO
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, RMM=4, ER Base Longitude=157.5E, Lag=Day -3
Composites – ER and MJO
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, RMM=4, ER Base Longitude=157.5E, Lag=Day -2
Composites – ER and MJO
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, RMM=4, ER Base Longitude=157.5E, Lag=Day -1
Composites – ER and MJO
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, RMM=4, ER Base Longitude=157.5E, Lag=Day 0
Composites – ER and MJO
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, RMM=4, ER Base Longitude=157.5E, Lag=Day 1
Composites – ER and MJO
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, RMM=4, ER Base Longitude=157.5E, Lag=Day 2
Composites – ER and MJO
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, RMM=4, ER Base Longitude=157.5E, Lag=Day 3
Composites – ER and MJO
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, RMM=4, ER Base Longitude=157.5E, Lag=Day 4
Composites – ER and MJO
10-20 -10 10 20 30-30
W m-2
0 60E 120E 180 120W 60W
0
20S
20N
40N
60N
OLR, 300-hPa Height and Wind Anomaly, RMM=4, ER Base Longitude=157.5E, Lag=Day 5
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
Conclusion
MJO Convection
Extratropical Rossby Waves
Equatorial Rossby Waves
Thank You
Lawrence C. Gloeckler and Paul E. RoundyDepartment of Atmospheric and Environmental Sciences
University at Albany, Albany, NY
[email protected]||[email protected]
http://www.atmos.albany.edu/student/lgloeckl/www.atmos.albany.edu/facstaff/roundy/