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Short‐term variability in isotopic composition of precipitation: A case study from the Midwestern United States by M. Z. Iqbal is a Environmental Science article available to read on EtoBox.

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## Abstract Oxygen and deuterium isotopes in precipitation were analysed to define local isotopic trends in Iowa, US. The area is far inland from an oceanic source and the observed averages of δ^18^O and δ D are − 6·43‰ and − 41·35‰ for Ames, − 7·53‰ and − 51·33‰ for Cedar Falls, and − 6·01‰ and − 38·19‰ for Iowa City, respectively. Although these data generally follow global trends, they are different when compared to a semi‐arid mid‐continental location in North Platt, Nebraska. The local meteoric water lines of Iowa are δ D = 7·68 δ^18^O + 8·0 for Ames, δ D = 7·62 δ^18^O + 6·07 for Cedar Falls, and δ D = 7·78 δ^18^O + 8·61 for Iowa City. The current Iowa study compares well with a study conducted in Ames, Iowa, 10 years earlier. The differences between Iowa and Nebraska studies are attributed to a variable climate across the northern Great Plains ranging from sub‐humid in the east to semi‐arid in the west. Iowa being further east in the region is more strongly influenced by a moist sub‐humid to humid climate fed by the tropical air stream from the Gulf of Mexico. The average __d__‐excess values are 10·06‰ for Ames, 8·92‰ for Cedar Falls and 9·92‰ for Iowa City. Eighty seven perc

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Author

M. Z. Iqbal

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0885-6087)

Published

2008

Language

EN

Field

Environmental Science (Physical Sciences)