. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography January 1975 BROWN, MUNK, SNODGRASS, MOFJELD AND ZETLER Pacific 77 .05°C TB(REIKO) I I I I I I t I I I I H 1 I I I I I I I I 1,0 '20 November I ) I I I I I I I I M 1 I I I I I | I I I December MODE TB(REIKO). To(MERT) Ta,(EDIE) -IS***' March April May July Fig. 3. Bottom temperatures at REIKO and MERT (separation 2 km) and EDIE (separation 170 km). For comparison, a typical Pacific record (REIKO 250 SW; Snodgrass el al., 1975) is shown on the same s
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography January 1975 BROWN, MUNK, SNODGRASS, MOFJELD AND ZETLER Pacific 77 .05°C TB(REIKO) I I I I I I t I I I I H 1 I I I I I I I I 1,0 '20 November I ) I I I I I I I I M 1 I I I I I | I I I December MODE TB(REIKO). To(MERT) Ta,(EDIE) -IS***' March April May July Fig. 3. Bottom temperatures at REIKO and MERT (separation 2 km) and EDIE (separation 170 km). For comparison, a typical Pacific record (REIKO 250 SW; Snodgrass el al., 1975) is shown on the same scale. In contrast to Fig. 2, the records have not been low-passed, and are plotted at 24-min intervals. 4. Bottom pressures Tides were removed by subtracting the "response predicted" deep-sea tides, with Bermuda-predicted tides taken as reference (Zetler et al., 1975). There is no significant tidal residual in the "detailed" records. For good measure, the detided time series of 45 s averages were low-passed with a 40 dB reduction at 1 cycle per day (cpd) (Fig. 4), and plotted at 24 h intervals (Fig. 5). _ Three instruments within 15 km of the central mooring, AOML 1 (a Filloux Bourdon tube), MERT and REIKO (quartz crystals), show a strong resem- blance during times of overlapping records. Pressure changes are larger and more sudden than we had suspected; they can amount to 5 mb in a few days. An unexpected result is the resemblance with the distant MODE stations EDIE and AOML 3. Evidently the bottom pressure fluctuations have larger horizontal scales than typical MODE eddies. We have also plotted atmospheric pressures in the MODE and Bermuda areas,7 and these are clearly coherent. In order to learn whether bottom pressures in the two areas are similarly related, we define the "subsurface pressure" (at a fixed point) SSP = £atm+pg77, where 77 is the recorded sea level (detided). For a homogeneous ocean the subsurface and bottom pressure 7 Mr. Fran
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