. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering Hydrographic structure 41 shelf), by isopycnals extending from the shelf to intersect the sea surface above the slope, and by isolines downwarped beneath the front. Available winter data show that this front persists throughout the year. Coachman and Charnell (1979) and Coachman (1978) examined this region in more detail, and described this transition zone as two broad fronts, one over the slope and one farther inshore near the 100 m isobath. Between these two tr
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering Hydrographic structure 41 shelf), by isopycnals extending from the shelf to intersect the sea surface above the slope, and by isolines downwarped beneath the front. Available winter data show that this front persists throughout the year. Coachman and Charnell (1979) and Coachman (1978) examined this region in more detail, and described this transition zone as two broad fronts, one over the slope and one farther inshore near the 100 m isobath. Between these two transitions, each of which has a large horizontal salinity gradient (~10 X 10""' g/kg/km), is a region of very small gradient (Fig. 4-7). The transition near the shelf break corresponds to the front described by Kinder and Coachman (1978), while the inner transition corresponds to the middle front separating the middle and outer domains (Fig. 4-1). At different times when examined by different distributions, these broad transitions do appear truly frontal. For instance Coachman and Charnell (1979) showed a mean cross-shelf temperature section for August 1976 that clearly showed a thermal front near the 100 m isobath, and Coachman (1978) showed strong evidence of a front delineated by particulate and chlorophyll a concentrations in April 1978. Over the slope Kinder and Coachman (1978) showed a shallow weak-density front in an August 1972 section, and we show a weak-salinity front from February 1978 (Fig. 4-9). Kinder and Coachman (1978) also showed large dissolved phosphate and nitrate gradients across the shelf break front in July 1974. Both the middle and shelf break fronts gen- erally appear broad and therefore weak, but oc- casionally they are manifest as sharp fronts in various properties. The shelf break front, however, can always be detected as a weak front in salinity. Finestructure and density inversions Finestructure, the layering of vertical profiles on scales
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