. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography October 1974 FEODOR OSTAPOFF AND SYLVIA WORTHEM ENERGY SPECTRA DAY (STABLE) NIGHT (UNSTABLE) 611 log (E(. log (EJ subrange buoyancy\—2 subrange T 1 1 r- Driving N0 ND llO\,/7 Frequency °m,B °"« l~) log (FREQUENCY) buoyancy subrange inertial subrange Driving NN Frequency 'Nmo. (!H1,/J log (FREQUENCY) Fig. 10. Energy spectra for stable and unstable conditions. range for the unstable stratification occurring during the night periods. Since the spe
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography October 1974 FEODOR OSTAPOFF AND SYLVIA WORTHEM ENERGY SPECTRA DAY (STABLE) NIGHT (UNSTABLE) 611 log (E(. log (EJ subrange buoyancy\—2 subrange T 1 1 r- Driving N0 ND llO\,/7 Frequency °m,B °"« l~) log (FREQUENCY) buoyancy subrange inertial subrange Driving NN Frequency 'Nmo. (!H1,/J log (FREQUENCY) Fig. 10. Energy spectra for stable and unstable conditions. range for the unstable stratification occurring during the night periods. Since the spectra in frequency space for the inertial subrange are expected to decay as u-2 [Eq. (15)] and ru is also expected to decay as w~2 for a stably stratified fluid [Eq. (17)], a Tu spectrum would not illuminate the question of the stably stratified buoyancy subrange. However, the data appear to be consistent with the above theory. It should be remem- bered that the 40 m record contains some intrusion of the pycnocline due to the internal tide and that the diurnal heat wave is barely observable in the 30 m record. In order to derive the buoyancy space scale, it is necessary to estimate the mean speed of the water past the sensors. As mentioned above the sensors were suspended under a parachute drogue buoy. In order to keep the parachute open some slippage must occur and this has been estimated to be cm sec-1. This is a mean speed derived from the mean buoy drift as de- termined by hourly bearings from the ship and absolute ship positioning by excellent satellite fixes as well as the passage of a salinity front through the experimental Table 4. Buoyancy time scale calculations. Segment Day or PlO-20 m P20-30 m P 30-40 m no. night (min) (min) (min) 1 D 2 N * 3 D 4 N * 5 D 6 N * * Unstable conditions. area which was taken as the mean advection of the water mass. This salini
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