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Miami FRE Meeting Mar 2008 Results from Four Fall Rate Experiments Derrick Snowden, Molly Baringer and Gustavo Goni
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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