A comparison between the IOCCG Simulated Data Set and NOMAD V2 from an OWT
perspective
Timothy S. Moore
University of New Hampshire
GIOP meeting
Sept. 25, 2010
Anchorage Alaska
OWT NOMAD*
w/ IOPs
IOCCG
Sim.
Global Avg.
1 3 (9) 7 31
2 8 (14) 8 31
3 18 (17) 10 21
4 20 (26) 4 9
5 19 (14) 10 4
6 22 (13) 40 2
7 9 (7) 20 1
8 2 (1) 1 <1
Distribution of OWTs in Data sets vs. Ocean Obsverations (numbers are in percent)
* - AOP without matching IOPSs
N=41N=45
N=180
N=91
N=6N=19
N=45
N=43
OWT 1
OWT 2
OWT 3
OWT 4
OWT 5
OWT 6
OWT 7
OWT 8
ag411
OWT 1
OWT 4
OWT 3
OWT 2
OWT 5
OWT 6
OWT 7
OWT 8
bbp slope
aph
aph 443
Comparison to NOMAD data
IOCCG
OWT 1
NOMAD
ag s
IOCCG
NOMAD
log ag443
OWT 1
log aph443 ag443/at443 bbp slope
log ag443bbp slope
log aph443
OWT 2
IOCCG
NOMAD
-2.5 -2 -1.5 0.5-1 -0.5 0 -2.5 -2 -1.5 -1 -0.5 0 -0.5 0 0.5 1 1.5 3.52.5 32
ag443/at443
OWT 3
log ag443 bbp slopelog aph443
IOCCG
ag443/at443
OWT 4
log ag443 bbp slopelog aph443
IOCCG
ag443/at443
OWT 5
log ag443 bbp slopelog aph443
IOCCG
ag443/at443
OWT 6
log ag443 bbp slopelog aph443
IOCCG
ag443/at443
OWT 7
log ag443 bbp slopelog aph443
IOCCG
ag443/at443
OWT 8
log ag443bbp slope
log aph443
IOCCG
ag443/at443
All
Summary
• There are some inconsistencies in the OWT-based distributions of IOPs between NOMAD and the IOCCG simulated data set.
• Both data sets are skewed towards coastal/case 2 waters.
• Both data sets have some questions regarding the spectral slope of CDOM.
• If a new simulated data set is being considered, the generation of IOPs and IOP pairs could be further constrained by the variance and co-variance as seen in NOMAD within different OWTs.
• In addition, the representation of data points could be guided by the global distribution of naturally occurring OWTs.
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