thoughts

[PremKolar]

• sigma(aviI) < sigma(aviI) for large phi because cut window larger => fourier fit determines main spectral component better.
• chelton: "The fact that L_s is consistently so much larger than L is a clear indication of inadequacy of a Gaussian approximation for the eddy structures, in which case L_s and L would be equal as noted above. It is shown in Section 5 that the most frequently occurring structure of the tracked eddies consists approximately of an axisymmetric quadratic profile of SSH within most of the radius Ls, thus resulting in Ls significantly larger than the scale L that would be obtained if the eddies had Gaussian shape."
  wrong! eddies not detect at base, hence only "tip" being looked at -> seemingly quqdratic profile..
• inherent problem to S04 method: if iq low; identitycheck will fail in case of merge/split situations. => tracks are cut short. ie a large eddy absorbing another has clearly not died, but might fail the id check, as area and esp. amp jump +.
• question of definition: can one eddy split into 2 or can 2 join to become one? if one splits are we talking 3, or 2 unique eddies in total?
• chelton is really just tracking closed contours encompassing some area of uniform ssh sign... no shape requirement whatsoever..
• ?: ssh(x)=A exp(-1/2sigma x^2) is sigma determinable from one measured amp and radius? what if dssh/dx ie V(x) is known? answer seems to be NO!
  Hence: dynamic-amp/radius solution seems to be best method to determine sigma ie ssh_xx==0
• chelt defines robustness as (apparent) 'longevity', i define via shape.
• inherent problem to S04 method: if iq low; identitycheck will fail in case of merge/split situations. => tracks are cut short. ie a large eddy absorbing another has clearly not died, but might fail the id check, as area and esp. amp jump +.
• at poles: avi res too small. i use fourier (sinusoidal) fit. sigma via sin smaller than via e! but: sigma in results is too large not too small!