. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . 1-1 10"' 10' FREQUENCY IN CYCLES/DRY Figure 7-11. Same as Fig. 7-10, for meter NC7. 10' signal at the M2 tidal frequency. In particular, there is essentially no variance at time scales less than about three days. At lower frequencies the energy level increases gradually, with the bulk contained at fre- quencies less than cycle per day. At NC7 the flow is of an entirely different tem- poral nature. The M2 signal is about one-third as large, but the low-frequency bands are far str
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . 1-1 10"' 10' FREQUENCY IN CYCLES/DRY Figure 7-11. Same as Fig. 7-10, for meter NC7. 10' signal at the M2 tidal frequency. In particular, there is essentially no variance at time scales less than about three days. At lower frequencies the energy level increases gradually, with the bulk contained at fre- quencies less than cycle per day. At NC7 the flow is of an entirely different tem- poral nature. The M2 signal is about one-third as large, but the low-frequency bands are far stronger everywhere below the diurnal. By far the largest energy concentration is the one with a period close to five days. We note also that the energy does not drop off at the lowest frequencies, as is the case for NCI. In summary, then, the current records show a flow field which in the central and western Chukchi (NCl-4) is less energetic (except in the semidiurnal tidal band) and far less variable than in the eastern Chukchi (NC6 and 7). At the same time, the flow appears sufficiently coherent laterally to encourage transport calculations, with the expectation that there will be large variations at time scales longer than a few days. Cape Lisburne transports Figure 7-12 shows the transport section defined by the six moorings NC1-NC7, and Table 7-3 lists the geometric parameters. The length of Ij , , the effective horizontal extent over which the current measured at NCI is ap- plied for transport purposes, was determined in the following way. Examination of Brown Bear (1960), Northwind (1963), and Oshoro Maru (1972) data (cf. Coachman et al. 1975 for data references) indicate that in the vicinity of 1,, the influence of the south-
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