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Monthly record of the Cl and Cl-36 fallout rates in a deciduous forest ecosystem in NE France in 2012 and 2013

Abstract : This study aims at determining the chlorine and chlorine-36 fallout rates in an experimental beech forest site located in NE France (48 degrees 31'55 `' N, 5 degrees 16'8 `' E). A monthly record of Cl and Cl-36 concentrations in rainfall samples collected above the canopy was performed during two years, from March 2012 to February 2014. The results show that the Cl concentrations mainly originate from sea-spray while the Cl-36 concentrations originate from the stratosphere and therefore present a seasonal dependency. Abrupt and important inputs of Cl-36 from the stratosphere indeed yield sharp increases of the recorded concentrations during the spring-summer. We also show that a too short sampling period might bias the determined Cl-36 fallout rate. To smooth the seasonal and sporadic bursts of Cl-36, a minimum of 6 months sampling period is required. A mean Cl-36 fallout rate of (77 +/- 21) atoms m(-2) S-1 can be deduced from our study, which is 45% higher than the modelled value. This discrepancy suggests more studies aiming at measuring the Cl-36 fallout rate worldwide are necessary. (C) 2016 Elsevier B.V. All rights reserved.
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https://hal.archives-ouvertes.fr/hal-01424608
Contributor : Lucilla Benedetti <>
Submitted on : Monday, January 2, 2017 - 3:27:14 PM
Last modification on : Tuesday, September 7, 2021 - 3:36:31 PM

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Julie Pupier, Lucilla Benedetti, Camille Bouchez, Didier Bourles, Elisabeth Leclerc, et al.. Monthly record of the Cl and Cl-36 fallout rates in a deciduous forest ecosystem in NE France in 2012 and 2013. Quaternary Geochronology, Elsevier, 2016, 35, pp.26-35. ⟨10.1016/j.quageo.2016.04.002⟩. ⟨hal-01424608⟩

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