Miami FRE Meeting Mar 2008
Results from Four Fall Rate Experiments
Derrick Snowden,Molly Baringer and Gustavo Goni
Miami FRE Meeting Mar 2008
Cruise Locations
rvyf: 427 (6 systems)
rb98: 79
nf0705: 10pne07: 18
Miami FRE Meeting Mar 2008
PNE07 XBT/CTD Profiles
Miami FRE Meeting Mar 2008
PNE07 XBT/CTD Profiles
Miami FRE Meeting Mar 2008
Determining Depth Offset
Focus on the temperature gradient: derivative of temperature with respect to depth
Minimize temperature error effect
Miami FRE Meeting Mar 2008
Depth Offset Prior to Correction
Miami FRE Meeting Mar 2008
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
Miami FRE Meeting Mar 2008
Depth Offset: Post-Correction
Miami FRE Meeting Mar 2008
Depth Offset Prior to Correction
Miami FRE Meeting Mar 2008
Depth Offset: Post-Correction
Miami FRE Meeting Mar 2008
Depth Offset Prior to Correction
Miami FRE Meeting Mar 2008
Depth Offset: Post-Correction
Miami FRE Meeting Mar 2008
Depth Offset Prior to Correction
Miami FRE Meeting Mar 2008
Depth Offset: Post-Correction
Miami FRE Meeting Mar 2008
Summary of Fall Rate Coefficients
A (x10^-3) B C
Wmo 52 -225 6.691 0
rvyf -191 6.487 0
rvyf -299 6.639 -4.5117
pne07 -250 6.5752 0
pne07 -243 6.5644 0.3312
nf0705 -260 6.4901 0
nf0705 -441 6.7586 -8.4701
rb98 -172 6.5387 0
rb98 -232 6.6181 -2.1887
other studies (1)
-131 – -329
6.440 – 6.798
0 - 0
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