. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ECOLOGY AND POPULATION BIOLOGY 247 8000 1t^ 222 A _— 6000 ° 226Ra . ' — 10 "•— E • E Q. J3. 4000 o Q. i o * _ - DC 8! 2000 .. • Oo o *ei>» a . • . • ».* ° * *„ ° o •„ «'o ,• • > •• 8^ nn 0 10 20 30 Salinity Distance (m) 4 8 12. Figure 2. TVu- distributions of radiwn-226 and radon-222 in groiind- water displayed a patient of increasing activity with increasing salinity, depth, and distance from the beach benn. The non-conservative distribu- tion of-'"Ra and ---Rn is displayed in a plot of isotope acti
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ECOLOGY AND POPULATION BIOLOGY 247 8000 1t^ 222 A _— 6000 ° 226Ra . ' — 10 "•— E • E Q. J3. 4000 o Q. i o * _ - DC 8! 2000 .. • Oo o *ei>» a . • . • ».* ° * *„ ° o •„ «'o ,• • > •• 8^ nn 0 10 20 30 Salinity Distance (m) 4 8 12. Figure 2. TVu- distributions of radiwn-226 and radon-222 in groiind- water displayed a patient of increasing activity with increasing salinity, depth, and distance from the beach benn. The non-conservative distribu- tion of-'"Ra and ---Rn is displayed in a plot of isotope activities, incasio-cd as disintegrations per minute per liter of water (dpm I ~'). as a function of increasing salinity IA). A vertical cross section of Rn activities through the fresh, intermediate, and saline portions of the aquifer IB, contour pint. individual samples represented h\ diamonds (4)) reveals increasing ac- tivity from the surface to 8 m, and distance from the henn in 12 in. A 5-point running average of the lime-series record of groundwater veloci- ties is plotted alongside tidal height above sea floor (C). To quantify SGD to Waquoit Bay. we applied a non-steady-state mass balance model to our time-series 222Rn record collected over 3 days at the head of the bay. Corrections for atmospheric evasion, loss due to advection to the lower bay. and changes in inventory due to water column depth were all applied to the time-series data using the approach of Burnett and Dulaiovu (5) to calculate the excess 222Rn flux (dpm m"2 d~') during each 30-min interval. Dividing by the average groundwater 222Rn activity (dpm m 3). we estimated SGD rates ranging from 0 to m d '. with a mean of ± m d"1 (n = 132. 1-cr). In general. SGD was related to tidal stage (Fig. 2cl. whereby SGD was highest at low. tide and lowest at hiiih tide, a result consistent with other time- series estimates of SGD in coastal systems (6. 9). We su
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
