1. Water Vapor Analysis using ship launched Rawinsondes and MODIS
LCDR D. T. Derley
OC 3570 Operational Oceanography
Naval Post Graduate School
8 March 2006

2. Briefing Outline Overview Motivation Brief theory Process
Where this can be applied
Why is it important
Brief theory
Process
Examples (present and past)
Summary

3. Overview
This project / brief analyzed the soundings that were created using the rawinsonde data and compared them with the water vapor information obtained using the satellite borne remote sensor MODIS (Moderate-resolution Imaging Spectroradiometer).
The focus area will be on whether or not a correlation can be made between the satellite information and the shape of the associated rawinsonde sounding profiles

4. Motivation Ducting environments occur over a large portion of the
globe and can be exploited
by both sides.
Worldwide ducting Probabilities. (Prof. Davidson)

5. Different types of ducting
Evaporation ducting
Surface-based ducting
dB above noise
dB above noise
LT McBride’s Thesis

6. Brief Theory
The strength of the inversion determines whether or not a duct will exits.
Two primary components that determine whether dm/dz < 0 is the strength of the inversion.
There exist a technique to estimate the strength (gradient) of the temperature inversion but not the moisture.
Different types of Ducts and their associated M profiles. (Prof. Davidson)

7. Channels 27, ,
Ch 27
Ch 28
Ch 29
Ch 31

8. Process
Prior planning to establish times and locations of the satellites footprints
Rawinsonde needs to reach high altitudes
Litmus test
Distinct inversion in the sounding
Satellite overpass coincident with sounding

9. Rawinsonde Maps and Plots
OC 3570 Cruise Jan 2006
Rawinsonde Maps and Plots

10. 19-30 Jan 2006

11. 22/0954 UTC Jan 06

12. 22/0954 UTC Jan 06

13. MODIS 22 Jan 06 0940 UTC Ch. 27 Ch. 28 Ch. 29 Ch. 31 -27.1 deg. C

14. 22/0954 UTC Jan 06 Ch 27 ~6700m -27.1 deg. C Ch 28 ~4900m

15. 25/1152 UTC Jan 06

16. 25/1152 UTC Jan 06

17. MODIS 25 Jan 06 1010 UTC Ch. 27 Ch. 28 Ch. 29 Ch. 31 -23.9 deg. C

18. 25/1152 UTC Jan 06 Ch 27 ~ 5500m -23.9 deg. C Ch 28 ~3700m

19. Rawinsonde Maps and Plots
OC 3570 Cruise July 2005
Rawinsonde Maps and Plots

20. 18/1815 UTC Jul 05

21. MODIS 18 Jul 05 1840 UTC Ch. 27 Ch. 28 Ch. 29 Ch. 31 -22.61 deg. C

22. Ch 27 ~8800m
deg.C
Ch 28 ~6700m
-7.3 deg. C
Ch 29 ~3400m
deg. C
Ch 31 ~400m
deg. C

23. Aug 2004
Pt Sur

24. 9 Aug UTC

25. MODIS 9 Aug 04 2150 UTC Ch. 27 Ch. 28 Ch. 29 Ch. 31 -6.17 deg. C

26. Ch 27 ~ 8200m
deg. C
Ch 28 ~6400m
-6.17 deg. C
Ch 29 ~3700m
9.01 deg. C
Ch 31 ~700m
11.98 deg. C

27. Summary 2 of 36 showed requisite inversion
Winter months showed less moisture in the upper troposphere
Channels 27,28 and 29 “saw” approx. 2000m
deeper
Channel 31 was approx. 400m
Not enough data to show a distinct correlation that would allow us to predict the inversion strength using remote sensing alone.

28. Eric “rawinsonde” MacDonald
Token slide of…..
Eric “rawinsonde” MacDonald