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GSA Annual Meeting in Seattle, Washington, USA - 2017

Paper No. 69-40
Presentation Time: 9:00 AM-5:30 PM

STABLE ISOTOPE AND MAJOR ION GEOCHEMISTRY OF URBAN PRECIPITATION


SMITH, Devin F.1, SAELENS, Elsa1, LESELIE, Deborah2, LISTON, Marcus3, WELCH, Sue A.1 and CAREY, Anne E.4, (1)School of Earth Sciences, The Ohio State University, 275 Mendenhall Laboratory, 125 South Oval Mall, Columbus, OH 43210, (2)USDA, Agricultural Research Service Lab, Jonesboro, AR, (3)The Ohio State University, School of Earth Sciences, 125 South Oval Mall, Columbus, OH 43210, (4)School of Earth Sciences, The Ohio State University, Columbus, OH 43210, smith.11880@buckeyemail.osu.edu

Analysis of precipitation from Columbus, Ohio has identified the stable isotopic and major ion content of urban precipitation and shown the effect of urban environment impacts on precipitation as determined by seasonality, volume, and event. The study provides an understanding of how continental cities influence local precipitation by defining a local meteoric waterline (LMWL) through stable hydrogen (δD) and oxygen (δ18O) isotope variations for central Ohio, and additionally by characterizing the chemical composition of precipitation. Samples were collected from April 2014 to July 2017 and analyzed using a Picarro Cavity Ring Down Spectroscopy Analyzer (Model L1102-i) for water isotopes for δ18O and δD and Thermo Scientific Dionex (ICS-2100 and DX-120) ion chromatography systems for major anion and cation concentrations. Collection sites included several locations in central Ohio on and near The Ohio State University Campus. Results showed lighter δ18O and δD signatures with higher d-excess in winter months and heavier signatures in summer months due to changes in temperature and precipitation source. The LMWL was determined as δD = 7.8*δ18O + 9.25 (R2 =.9768), slightly different from the global meteoric waterline (GMWL) δD = 8*δ18O + 10. The major ion concentrations in precipitation revealed the presence of urban and natural aerosols and indicated the occurrence of both atmospheric below-cloud scavenging and wash-out. Major ions included NO3-, SO42-, Cl-, NH4+, Ca2+, Mg2+, and K+, with concentrations differing by seasons and precipitation events. This LMWL provides isotopic ratios of δ18O and δD for the eastern continental United States, benefiting future precipitation studies in this region. Further, isotopic composition and chemical components of urban precipitation as determined by seasonality, volume, and event source highlight both the climatic factors controlling precipitation trends and the anthropogenic factors influencing precipitation chemistry.

Session No. 69--Booth# 139

D32. Geochemistry (Posters)
Sunday, 22 October 2017: 9:00 AM-5:30 PM
Halls 4EF (Washington State Convention Center)
Geological Society of America Abstracts with Programs. Vol. 49, No. 6
doi: 10.1130/abs/2017AM-306089
© Copyright 2017 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.
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