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Variations of delta O-18 in rainwater from southwestern Oregon

Ersek, Vasile, Mix, Alan C. and Clark, Peter U (2010) Variations of delta O-18 in rainwater from southwestern Oregon. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 115 . D09109. [Journal article]

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DOI: 10.1029/2009JD013345

Abstract

We examine the relation between δ18O in rainwater collected in southwestern Oregon and climate variables including temperature, parcel trajectory, precipitation amount, and specific humidity. Local surface air temperature at the time of sample collection explains a large proportion of δ18O variability, suggesting that paleoclimatic archives that are related to rainfall δ18O should be useful for qualitative temperature reconstructions. Models of Rayleigh distillation of air masses originating in the North Pacific can broadly constrain the observed isotopic variability in southwestern Oregon. Results from a Hybrid Single-Particle Lagrangian Integrated Trajectory Model suggest that recent parcel pathways have little influence on the isotopic composition of precipitation collected at our site. We also find no significant relation between rainfall δ18O and precipitation amount. Changes in specific humidity along the parcel tracks, however, indicate that the water vapor exchange of the air mass with the underlying ocean influenced the isotopic composition of the most enriched samples.

Item Type:Journal article
Faculties and Schools:Faculty of Life and Health Sciences > School of Geography and Environmental Sciences
Faculty of Life and Health Sciences
Research Institutes and Groups:Environmental Sciences Research Institute > Quaternary Environmental Change
Environmental Sciences Research Institute
ID Code:27128
Deposited By: Mrs Linda Allen
Deposited On:29 Sep 2013 08:32
Last Modified:29 Sep 2013 08:32

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