Posted by Kashima, Motohiko on November 22, 2000 at 01:32:24:
In Reply to: Multiple topics posted by Mark Wimbush on November 06, 2000 at 13:49:43:
: In the first figure of the Geostrophy section, does the
: "observed shear" have no TRM filtering? It would be
: interesting to show what this correlation looks like with
: the optimum (Godin + 5-day TRM) filtering.
The observed shears in the first figure have Godin filtering only.
The result of 5-day GTRM filter looks almost the same. I've added this figure (total number of comparison data decrease from 43 to 39 because of the data loss by TRM length change).
: I would expect that the optimum length of the TRM filter
: would be greater for hydrographic station pairs which are
: far apart than for those which are close together. But
: only a single overall optimum is given: 5 days. Do you in
: fact see significantly differenct optimum lengths for the
: different CM's (with different CTD station separations)?
: If so, is there a consistent pattern of dependence of
: optimum TRM length on CTD station separation?
The correlation pattern of each CM is all different and relate with the distance between the CTD stations, but it is not the major reason of difference of each CM. They relate more with the position where in or out of the Kuroshio.
The average distance between the two CTD used and the best correlated GTRM length for each of CM are, CM05 14km 6day, CM06 28km 2day, CM07 41km 0day, CM08 46km 7day, all with a consistent pattern of dependence of optimum TRM, CM09 47km 8day, low correlation with weaker consistent pattern, and CM10 61km 9day with the consistent pattern.
To see a single overall pattern is not the best way. I will check some more soon.
: Have the temperature data in the third figure of the
: Variability section been corrected for the time-varying
: actual depths of the current meters? Is it significant
: that the two strong warmings at CM08, seen in this figure,
: seem to occur near the times of maximum westward velocity
: recorded by this current meter (first figure)?
The temperature at exact 650 m is well made from the temperature at actual CM depths and CTD mean temperature vertical profile. Using my profile(T,D) for each CM is just like using a part of GEM(TT,D,T).
The two strong maximum warming in this depth are significant and they generate in the little near-shore side of the strong maximum westward current exist. It is possibly means there is a warm meddies as a small scale Kuroshio recirculations.
: The "tilt" of the features seen in the T/P velocity data
: (last figure of Variability section) suggests shoreward
: propagation of these eddy features at about 4 km /day.
: [Note I don't understand the last phrase in the caption
: of this figure: What does the 650 m temperature have to
: do with the figure?]
The propagation is well seen in both the T/P and CM figure. I think the direction is more in east to west component as meddies propagation more than northward component. The meanders are generated by these meddies. The Kuroshio meandering cycle south of Shikoku is about 3 times par year (my master thesis 1998, and also in Book et al this web site). According to Ebuchi et al (J. Ocenor. 2000), the meddies propagation speed in south of Japan is about 5.9 km/day in westward and the diameter of meddies are about 500 km, then its crossing ASUKA line cycle is about 4 time