. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . 156° Figure 27-1. Location of stations occupied in Bristol Bay in 1975 and July 1976. The solid lines show the ver- tical sections along which the distribution of properties is discussed. Depth contours are in fathoms. measurements (24 hours and 36 hours) were made at Stations Ebb 37 and 46 in September and October, 1975. In addition to the sampling for dissolved hy- drocarbons, measurements of salinity, temperature, and concentrations of suspended matter were also made at eac
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . 156° Figure 27-1. Location of stations occupied in Bristol Bay in 1975 and July 1976. The solid lines show the ver- tical sections along which the distribution of properties is discussed. Depth contours are in fathoms. measurements (24 hours and 36 hours) were made at Stations Ebb 37 and 46 in September and October, 1975. In addition to the sampling for dissolved hy- drocarbons, measurements of salinity, temperature, and concentrations of suspended matter were also made at each of the stations shown (Feely and Cline 1977). Methane Methane is the dominant dissolved LMW hydrocar- bon and its distribution reflects both seasonal and spatial source patterns. The distributions of dissolved methane in surface and near-bottom waters are shown in Figs. 27-2a and b for September and October 1975. Except for a localized source near Port Moller, surface concentrations of methane were near values expected from the saturation of air. Assuming a methane partial pressure of ppm(v) (Ehhalt 1974) and a mean surface temperature and salinity of 7 C and 31^/00 (Kinder and Schumacher, Chapter 4, this volume), the equilibrium solubility concentration of CH4 is 53 ± 3 nl/1 (STP) (Yamamoto et al. 1976). The plume of methane observed south of Cape New- enham may have arisen from the Nushagak and Kvi- chak Rivers, although the small enrichment noted (75 nl/1 < CH4 < 94 nl/1) is near the ambient noise level when variability in time and space is taken into ac- count. These data, however, do not rule out a con- tribution from bottom sediments in the Kuskokwim Delta.
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