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Southern Ocean GLOBEC: Status of ADCP and Microstructure

Southern Ocean GLOBEC: Status of ADCP and Microstructure. L. Padman 1 , B. Beardsley 2 , S. Howard 1 1 Earth & Space Research, Seattle WA 2 Woods Hole Oceanographic Inst., Woods Hole MA. ADCP Status. ADCP Data Access. Data are served through ESR’s web site as Matlab MAT files:

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Southern Ocean GLOBEC: Status of ADCP and Microstructure

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  1. Southern Ocean GLOBEC: Status of ADCP and Microstructure L. Padman1, B. Beardsley2, S. Howard1 1Earth & Space Research, Seattle WA 2Woods Hole Oceanographic Inst., Woods Hole MA Laurie Padman: S. O. GLOBEC P.I. Meeting, December 2002: Washington D.C.

  2. ADCP Status Laurie Padman: S. O. GLOBEC P.I. Meeting, December 2002: Washington D.C.

  3. ADCP Data Access Data are served through ESR’s web site as Matlab MAT files: http://www.esr.org/globec/globec.html and through the U.S. GLOBEC Data System at WHOI: http://globec.whoi.edu/jg/dir/globec/soglobec/ where users can convert to ASCII, plot data, etc. Laurie Padman: S. O. GLOBEC P.I. Meeting, December 2002: Washington D.C.

  4. ADCP: General comments • Data loss occurs: in heavy sea states; and when vessels are underway in ice: so, most winter data are just at sampling stations. Data include high-frequency signals (mainly tides and near-inertial), with magnitudes that can at times exceed the mean circulation. Laurie Padman: S. O. GLOBEC P.I. Meeting, December 2002: Washington D.C.

  5. CMiPS: CTD-MountedMicrostructureProfilingSystem Laurie Padman: S. O. GLOBEC P.I. Meeting, December 2002: Washington D.C.

  6. CMiPS: Rationale Measures T(z) and C(z) at ~1 cm resolution (oversamples at 512 Hz) to look at turbulence due to • Shear instabilities • Double diffusion • Intrusions to answer the question: What is the diffusivity in the pycnocline between the UCDW and the mixed layer? Laurie Padman: S. O. GLOBEC P.I. Meeting, December 2002: Washington D.C.

  7. CMiPS Stations: NBP0204 Laurie Padman: S. O. GLOBEC P.I. Meeting, December 2002: Washington D.C.

  8. West of Marguerite Bay (CTD-044) Laurie Padman: S. O. GLOBEC P.I. Meeting, December 2002: Washington D.C.

  9. Marguerite Trough (CTD-091) Laurie Padman: S. O. GLOBEC P.I. Meeting, December 2002: Washington D.C.

  10. Palmer LTER Amid Icebergs (CTD-113) Laurie Padman: S. O. GLOBEC P.I. Meeting, December 2002: Washington D.C.

  11. Anchor Stations Laurie Padman: S. O. GLOBEC P.I. Meeting, December 2002: Washington D.C.

  12. Anchor Stations Laurie Padman: S. O. GLOBEC P.I. Meeting, December 2002: Washington D.C.

  13. Anchor Stations Laurie Padman: S. O. GLOBEC P.I. Meeting, December 2002: Washington D.C.

  14. Comparison of T-S Off-shelf Central WAP shelf SW of Palmer Stn. Gerlache Strait Low Rρ Med. Rρ Laurie Padman: S. O. GLOBEC P.I. Meeting, December 2002: Washington D.C.

  15. Summary • Making progress on ADCP clean-up and archiving; web-serving is now compatible with other GLOBEC programs. • Microstructure profiling on NBP0202 and NBP0204. Tentative conclusion: more mixing at main pycnocline than we thought from bulk parameterizations. • But little evidence of mixing below 150 m except near the shelf break. • No evidence of significant double diffusion in the GLOBEC area, but more likely in the Palmer LTER. Laurie Padman: S. O. GLOBEC P.I. Meeting, December 2002: Washington D.C.

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