1. RF Propagation Characteristics on Leg 1 of July 06 OC3570 Cruise
LCDR Bob Jones

8. Sonde 1

9. Sonde 1 - Full 36.7303N 122.0240W 19 July 1133 Local 269.2/3.1 mps
Ta: 15.3 C
SST: 18.8 C
RH: 92.4 %
Pres: hPa
Trapping
Duct - surface to 13 meters due to rapid decrease in humidity and increase in air temp.

10. Sonde 2

11. Sonde 2 – Up/Down 36.7167 N 122.2360 W 19 July 1329 Local
101.5/0.3 mps
Ta: 15.2 C
SST: 23.1 C
RH: 89.1 %
Pres: hPa
Trapping
Strong inversion

12. Sonde 3

13. Sonde 3 – Up/Down 36.6017 N 122.5070 W 19 July 1651 Local
225.7/1.9 mps
Ta: 14.9 C
SST: 17.1 C
RH: 95.0 %
Pres: hPa
Trapping
Lowest relative humidity around 800m

14. Sonde 4

15. Sonde 4 – Up/Down N W
19 July
2150 Local
331.0/3.1 mps
Ta: 14.6 C
SST: 14.9 C
RH: 90.2 %
Pres: hPa
Trapping

16. Sonde 5

17. Sonde 5 – Up/Down N W
20 July
0417 Local
297.7/4.9 mps
Ta: 14.7 C
SST: 15.1 C
RH: 89.2 %
Pres: hPa
Trapping

18. Sonde 6

19. Sonde 6 – Full N W
20 July
1050 Local
147.7/2.2 mps
Ta: 16.1 C
SST: 22.0 C
RH: 82.9 %
Pres: hPa
Trapping

20. Sonde 7

21. Sonde 7 – Full N W
20 July
1639 Local
171.3/1.0 mps
Ta: 16.2 C
SST: 21.1 C
RH: 90.5 %
Pres: hPa
Trapping

22. Sonde 8

23. Sonde 8 – Up/Down N W
20 July
2153 Local
356.0/2.2 mps
Ta: 14.8 C
SST: 15.2 C
RH: 92.6 %
Pres: hPa
Trapping

24. Sonde 9

25. Sonde 9 – Up/Down N W
21 July
0402 Local
284.3/8.9 mps
Ta: 14.6 C
SST: 15.0 C
RH: 93.6 %
Pres: hPa
OVC
Trapping

26. Sonde 10

27. Sonde 10 – Up/Down N W
21 July
0957 Local
337.3/2.3 mps
Ta: 15.8 C
SST: 17.8 C
RH: 90.8 %
Pres: hPa
OVC
Trapping

28. Sonde 12
-Bad Data-
No dew point and relative humidity data. Kite data not used as not a compete profile of the atmosphere.

29. Sonde 13

30. Sonde 13 – Up/Down 37.1166 N 124.7080 W 21 July 2147 Local
326.6/10.1 mps
Ta: 14.9 C
SST: 15.3 C
RH: 97.6 %
Pres: hPa
Trapping
Strong elevated inversion

31. Sonde 14

32. Sonde 14 – Up/Down 37.2860 N 124.3490 W 22 July 0405 Local
315.6/10.4 mps
Ta: 14.1 C
SST: 14.4 C
RH: 99.2 %
Pres: hPa
Trapping
Another strong elevated inversion

33. Sonde 15

34. Sonde 15 – Full N W
22 July
1005 Local
293.6/6.2 mps
Ta: 13.7 C
SST: 14.5 C
RH: 99.7 %
Pres: hPa
Trapping

35. Sonde 16

36. Sonde 16 – Full N W
22 July
1559 Local
265.3/9.4 mps
Ta: 15.8 C
SST: 16.6 C
RH: 86.4 %
Pres: hPa
Trapping

37. Strong elevated inversions along with negative upper air humidity gradients led to elevated trapping layers.
Trapping layers lower at night.
More trapping layers in Monterey Bay as opposed to open ocean.
Very low OVC for majority of 21 July, lower SST’s, and lower trapping layers.
Close to San Francisco encounter very low, weak trapping layer (possible upwelling).
Need to evaluate sonde data against model data.