OC 3750 Operational Oceanography

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Presentation transcript:

OC 3750 Operational Oceanography Cruise Report - Frank Price Atmospheric Effects on Surface Based Ducts in comparison with ETA Model and Radiosonde Data.

OC 3750 Operational Oceanography Cruise Report Introduction Types of Ducts Synoptic Pattern Observed Data Conclusion

Different Types of Ducts Elevated Duct 300 200 100 Surface-based Duct Height (m) Evaporation Duct M (Modified Refractivity Index)

Synoptic Pattern The Monterey Bay, San Francisco Bay and shortly offshore experienced southwesterly winds on the backside of High pressure and approaching cold front. These winds brought warm moist air under an existing colder more dense atmosphere. Thus setting up an unstable atmosphere. This is why the first cruise experience surface based ducting. As front approached from the west the atmosphere became saturated and the surface duct disappeared. Below is a series of charts correlating to ship’s cruises

January 23, 2007 January 24, 2007 January 25, 2007 January 26, 2007 Sonde 1 36-48.31 121-49.77 1919Z Sonde 2 36-43.65 122-02.20 2351Z January 24, 2007 Sonde 3 36-42.40 122-03.88 0033Z Sonde 4 36-38.24 122-01.08 0600Z Sonde 5 36-17.51 122-25.46 1806Z Sonde 6 36-30.40 122-37.04 2351Z January 25, 2007 Sonde 7 36-50.04 122-48.50 0451Z Sonde 8 36-53.01 122-50.78 0533Z Sonde09 36-58.30 122-54.40 0613Z Sonde10 37-15.28 123-10.64 1056Z Sonde11 37-51.11 123-32.22 1750Z Sonde12 37-56.30 123-44.82 2215Z Sonde13 37-54.57 123-48.34 2256Z Sonde14 37-54.00 123-49.56 2341Z January 26, 2007 Sonde15 37-42.74 123-25.29 0607Z Sonde16 37-53.27 123-04.55 0939Z Sonde17 37-48.77 122-28.25 1654Z Sonde18 37-49.09 122-23.84 2041Z 2320Z Arrival Pier 27 San Francisco End Leg I

Jan 23 1200Z 500mb Heights Surface SLP

Jan 24 1200Z 500mb Heights Surface SLP

Jan 25 1200Z 500mb Heights Surface SLP

Jan 26 1200Z 500mb Heights Surface SLP

Jan 27 1200Z 500mb Heights Surface SLP

24/00Z 24/00Z 15 4 2 10 24/06Z 24/18Z 5 14 25/00Z 25/06Z 17 25/12Z 6 26/00Z 8 26/06Z 26/18Z Pierside26/23Z

Conclusion Synoptic weather pattern presented an unstable atmosphere such that the first leg observed surfaced based duct where the second leg did not. 12 KM ETA Model did not have great horizontal resolution below 1000mb further extracting surface model and making an assumption to the 1000mb level may have caused discontinuity with truth. Temperature Inversions and Atmospheric Instabilities cause significant changes in modified refractivity indexes (M)