Characterization of Sound Speed Profiles

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Presentation transcript:

Characterization of Sound Speed Profiles Winter Cruise 2006: 19-26 January ENS Vanessa Guthrie

Sound Speed (Global Plot) How can we characterize these profiles without losing the sound speed minimums?

Data Collection 63 total CTD casts used in analysis Data collected every 2 dbar Deep casts only (depth>=1000 dbar), collected every 2 dbar All data cut off at 1000 dbar

Data Processing Sound speed profiles from all 63 CTD casts were run through a Hanning filter Number of weights in filter varied from 7 to 101 Since data is plotted every 2 dbar, filter width = 2*number of weights For each number of weights, the standard deviation and difference in minimum from the filtered and actual profile was calculated

~200 dbar

< 0.5 m/s Differences in pressure tend to be more significant than differences in sound speed

Standard Deviation Plot of std dev vs. filter width for each cast and mean of all casts No clear breaking point Not a good indication of optimal filter width

Difference in Sound Speed at the Minimum (Δc) Value of c at the minimum of the actual data subtracted from c at the minimum of the filtered curve No breaking point Expect Δp to be more significant than Δc

Difference in Pressure at the Minimum (Δp) Value of p at the minimum of the actual data subtracted from p at the minimum of the filtered curve Lots of variation between stations

Casts over shelf Casts in deep water Casts in deep water FWOPT ~ 50 dbar FWOPT ~ 120 dbar Casts over shelf Casts in deep water FWOPT ~ 160 dbar FWOPT ~ 30 dbar Casts in deep water Casts over shelf

Mean of All Stations Deep Water FWOPT ~ 50 dbar (all casts)

Raw Data Sound Speed (Global Plot)

Filtered Data

Conclusions Elimination of small scale variations in the sound speed profile without losing the value of the sound speed minimum For all casts, filter width of ~50 dbar can be used to smooth the profile without significant loss of sound speed minimum data, averaging within 16 dbar and 0.12 m/s Profiles from deep water casts (beyond shelf) are more stable and can be smoothed with a filter width of ~120 dbar, averaging within 16 dbar and 0.21 m/s

Questions?