1. Mars Climate Sounder observations of wave structure in the North polar middle atmosphere of Mars during the summer season
Paulina Wolkenberg1 and John Wilson2
1Centrum Badań Kosmicznych PAN
2NOAA Geophysical Fluid Dynamics Laboratory

2. Outline Characteristic features of Mars Climate Sounder
Daytime and nighttime temperatures over North polar region
T-average and T-difference fields
Multi-track data
Results and comparison with the GCM model
Conclusions

3. Mars Climate Sounder nine broadband infrared channels
in the range 0.3 – 45 mm
vertical resolution 4 – 6 km
vertical range 0 – 80 km
2 K error in the retrieval
cross-track observations available

4. The red dots show the default 2x/sol coverage obtained with along-track viewing, while the blue dots show the additional coverage obtained with cross-track observations.

5. Daytime temperatures at 0.1 Pa
Ls= Ls=

6. Temperature: N Ls=
T3pm
T3am
0.1 Pa
T3pm
MY29-31
Longitude

7. m = 1
m = 2
m = 3
m = 4
Seasonal evolution of zonal wave components m = 1, m = 2, m = 3 and m = 4 derived from T3am at 60 – 65N. The interval in contour is 1K.

8. Evolution of the maximum amplitude of the zonal wave 2 component of T(3am) between 1 and 0.1 Pa. There are two maxima located between 20°N- 40°N and 60°N - 80°N centered at Ls = 90°. The interval in contour is 2 K. We’ll show that the northern peak is most likely a semi-diurnal tide, while the peak at 30N is due to an eastward propagating diurnal tide.

9. T-average field for Ls = 100 - 110
m=1
m=2
m=3
T-average field for Ls =
T-difference field for Ls =
(T3pm + T3am)/2
(T3pm – T3am)/2
Contributions from:
stationary waves, non-migrating
semidiurnal, migrating tides
Contributions from:
Diurnal non-migrating and
migrating tides

10. m = 1
m = 2
m = 3
Amplitudes and phases of T- average (left) and T – difference (right) fields for m = 1 (top), m = 2 (middle) and m = 3 (bottom) at Ls = and at N. The interval in contour is 1K. Locations of maxima correspond to wave phase at a particular pressure level.
Phase for the m = 3 zonal wave of T – average is 75°E and is tilted eastward between 10Pa and 0.01Pa. Phase for the m = 3 of T – difference is 60°E.

11. Zonal wave components in a function of LT
Zonal wave components in a function of LT. Amplitude maxima appear at different longitudes for different LT. This means that stationary waves are not responsible for this structure, only non-migrating and migrating tides.

12. Particular tides after the analysis of multi-track data at Ls = 101 – 114 and at 0.1Pa.
Diurnal tides
55 – 60N
57.5N-62.5N
60-65N
Semidiurnal tides N
57.5N – 62.5N
60 – 65N
A1,1
8.5 K
8.0 K
9.9 K
A1,2 m=1
1.4 K
1.5 K
3.0 K
A-1,1 m=2
2.3 K
2.1 K
4.1 K
A-1,2 m=3
3.7 K
1.9 K
A2,1 m=1
0.2 K
0.4 K
1.6 K
A2,2
5.5 K
4.5 K
2.2 K
A-2,1 m=3
2.0 K
1.0 K
A-2,2 m=4
0.7 K
0.3 K
1.7 K
A3,1 m=2
0.6 K
A3,2 m=1
1.1 K
A-3,1 m=4
1.3 K
A-3,2
0.0 K
A4,1 m=3
0.9 K
0.8 K
A4,2 m=2
0.1 K
A-4,1
A-4,2
A0,1 m=1
A0,2 m=2
1.8 K
4.3 K
(DW1)
(SW1)
(DE1)
(SE1)
(DW2)
(SW2)
(DE2)
(SE2)
(DW3)
(SW3)
(DE3)
(DW4)
(SW4)
(D0)
(S0)

13. Simulated NonMigrating Tides Ls= 105
Results from MCS data at 60N
A0,2 = 4.3 K
m=2
A0,1 = 1.5 K
m=1
A-1,1 = 4.1 K
m=2
A-2,1 = 2 K
m=3
A-3,1 = 1.6 K
m=4
A-1,2 = 4.1 K
m=3
Latitude
Latitude

14. Conclusions
Diurnal components of migrating tides dominate at 0.1 Pa over the semidiurnal one in the temperature field
The m = 2 wave structure is due to A0,2 (S0) with 4.3 K and A-1,1 (DE1) with 4.1 K while the m = 3 structure is due to A-2,1 (DE2) with 2 K and A-1,2 (SE1) with 4.1 K
Results are in an agreement with the GCM model