36Cl in chloride-rich rainwater, Israel

Details 36Cl in chloride-rich rainwater, Israel 36Cl in chloride-rich rainwater, Israel

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.109..179h&link_type=abstract

Earth and Planetary Science Letters, Volume 109, Issue 1-2, p. 179-183.

Computer Science

3

Scientific paper

Eleven rainwater samples from Israel have been analyzed for their isotopic 36Cl/Cl ratios and their soluble salt content. The rains display a range of 36Cl/Cl ratios between 1.8 × 10-15 and 50 × 10-15, and chloride ion concentrations of between 0.3 and 4.2 meq Cl-/l. The ratios between the concentrations of Na+, Mg2+ and Cl- in the samples demonstrate a clear marine origin for these ions in the rainwater.
Although the stable 35Cl isotope in rainwater is marine in origin, while the accompanying 36Cl radioisotope is non-marine, both are linearly and positively correlated in chloride-rich ( > 1 meq Cl/l) rains. The 36Cl-Cl seawater solute relationship may be explained as result of a mixing process between two chloride-bearing sources: (a) sea-spray laden air with a low 36Cl/Cl ratio, and (b) a Cl-rich mineral dust reservoir, with a high 36Cl/Cl ratio. Both are introduced and admixed into the atmosphere during storms. The possibility of a high 36Cl/Cl ratio stratospheric end-member is rejected in view of the non-marine nature of the chlorine therein.

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