A Comparison of Six Expendable Bathythermograph Data Acquisition Systems Derrick Snowden Molly Baringer Gustavo Goni.

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Presentation transcript:

A Comparison of Six Expendable Bathythermograph Data Acquisition Systems Derrick Snowden Molly Baringer Gustavo Goni

Instruments List System NameLauncher Type Recorder TypeController Software (PC) aomlautoAOML Autolauncher MK-12AOML (DOS 386 PC) devilhandSippican LM- 3A DevilDevil Software (Win XP PC) seasautoAOML Autolauncher MK-21SEAS2000 (WinXP PC) seashandSippican LM- 3A MK-21SEAS2000 (Win XP PC) sioautoSIO Autolauncher MK-21SEAS2000 (Win XP PC) siok98SIO Autolauncher MK total profiles

XBT Errors XBT differs from the CTD due to : A: inaccurate depth measurements B: inaccurate temperature measurements AB Depth (m) 0.250

MSE Bias Variance Depth (m)

Fall Rate Error: Initial Conditions Hallock and Teague 1992

Fall Rate Equation a: Change of mass of the probe due to spooling wire. b: Probe geometry and initial terminal velocity c: Describes startup transients i.e. initial conditions Currently used FRE (WMO 1770:52) for Deep Blue probes contains no constant term ( c ). e.g. Hallock and Teague (1992)

Determining Depth Offset Focus on the temperature gradient: derivative of temperature with respect to depth Minimize temperature error effect Hanawa et al (1995)

Depth Offset Prior to Correction

Depth Correction Algorithm Assemble the depth offsets (dZ) Recalculate XBT depths Znew = Zxbt+dZ Back calculate time (t) Fit new fall rate equation to (t) z = at^2 + bt + c

Depth Offset: Post-Correction

Summary of Fall Rate Coefficients ABC Wmocode this study this study other studies (1) – – : Taken from Hanawa et al 1995

1.aomlauto 2.devilhand 3.seasauto 4.seashand 5.sioauto 6.siok98