The stable isotopic composition (Cl/Cl) of dissolved chloride in rainwater |
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Authors: | Geoff Koehler Leonard I Wassenaar |
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Institution: | Environment Canada, 11 Innovation Blvd., Saskatoon, SK, Canada S7N 3H5 |
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Abstract: | The stable isotopic composition of dissolved Cl- in rainwater was measured from a coastal and an interior location in eastern Canada. At the interior Bonner Lake, Ontario, site the δ37Cl values of dissolved Cl- in precipitation ranged from −3.5‰ to −1.2‰ (SMOC) with an amount-weighted annual average of −2.3‰. At the coastal site, Bay D’Espoir, Newfoundland, δ37Cl values of dissolved Cl- values ranged from −3.1‰ to 0.0‰ with an amount-weighted annual average of −1.3‰. These negative δ37Cl values provide evidence that atmospheric HCl is 37Cl depleted, presumably from acidification of sea-salt aerosols. Accordingly, dissolved Cl- in the headwaters of two montane rivers in Western Canada had similarly depleted δ37Cl values. These results have implications to the interpretation of the isotopic compositions of dissolved Cl- in surface waters, formation fluids, and groundwaters. |
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