. Bulletins of American paleontology. 24 Bulletin 361 CO. "1—^—r 20 00 30 00 Salinity 1 ' I 40 00 50 00 Text-figure 5.—Mean monthly S'^O values versus salinity tor all sites in Florida Bay. Error bars represent ± 1 one standard deviation. sented in this study show that the isotopic composition of South Florida precipitation falls near the MWL (Text-fig. 3). It is relatively depleted with volume weighted means of 8D and 5"*0 and (0. respectively (Table 1). Based on a conelation between 8D and 8'^0, the data from the Everglades plot below the MWL (Text- fig. 3). Deviation
. Bulletins of American paleontology. 24 Bulletin 361 CO. "1—^—r 20 00 30 00 Salinity 1 ' I 40 00 50 00 Text-figure 5.—Mean monthly S'^O values versus salinity tor all sites in Florida Bay. Error bars represent ± 1 one standard deviation. sented in this study show that the isotopic composition of South Florida precipitation falls near the MWL (Text-fig. 3). It is relatively depleted with volume weighted means of 8D and 5"*0 and (0. respectively (Table 1). Based on a conelation between 8D and 8'^0, the data from the Everglades plot below the MWL (Text- fig. 3). Deviation away from the MWL is a well- known phenomenon and arises through the differential influence of evaporation of the oxygen and hydrogen isotopes. In the case of the Everglades data, the close- ness of the slope of the best fit line through the data 50 45 40 35 ^30 25 m:^ -10 -9 -6 -5 -4 -3 8"C (°/oo) Text-figure 7.—Mean monthly 6"C versus salinity for all sites in Florida Bay. () to the slope of the MWL, suggests evaporation at a high relative humidity (Gonfiantini, 1986). Meyers et al. (1993) predicted a mean relative humidity of 80% for the Everglades based upon a stable isotope evaporation model. The time series trend of the Ev- erglades data (Text-fig. 2) shows some seasonality with isotopically more positive values toward the end of the dry season when evaporation typically exceeds precip- itation. The intercept of the best fit line through the Ever- glades data with the MWL is similar to the isotopic composition determined for South Florida precipita- tion (Text-fig. 3). These results indicate that precipi- tation is the ultimate source of the evaporated water in the Everglades, Everglades water can be distinguished isotopically from its parent precipitation. The mean 8'^0 and 8D of the Everglades water is and ' PJ;C^ 0 -2t .<V4 /. •• ''*» O -4 O 0 O 6 "to 4 2 0 -2 -4. Please note that these images are extracted from scanned pa
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