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1. Variability and Controls on δ ¹⁸ O, d‐excess, and ∆′ ¹⁷ O in Southern Peruvian Precipitation

   https://doi.org/10.1029/2020JD034009  

   Aron, Phoebe G.; Poulsen, Christopher J.; Fiorella, Richard P.; Levin, Naomi E.; Acosta, Rene P.; Yanites, Brian J.; Cassel, Elizabeth J. (December 2021, Journal of Geophysical Research: Atmospheres)

   Abstract The isotopic composition of precipitation is used to trace water cycling and climate change, but interpretations of the environmental information recorded in central Andean precipitation isotope ratios are hindered by a lack of multi‐year records, poor spatial distribution of observations, and a predominant focus on Rayleigh distillation. To better understand isotopic variability in central Andean precipitation, we present a three‐year record of semimonthly δ¹⁸O_pand δ²H_pvalues from 15 stations in southern Peru and triple oxygen isotope data, expressed as ∆′¹⁷O_p, from 32 precipitation samples. Consistent with previous work, we find that elevation correlates negatively with δ¹⁸O_pand that seasonal δ¹⁸O_pvariations are related to upstream rainout and local convection. Spatial δ¹⁸O_pvariations and atmospheric back trajectories show that both eastern‐ and western‐derived air masses bring precipitation to southern Peru. Seasonal d‐excess_pcycles record moisture recycling and relative humidity at remote moisture sources, and both d‐excess_pand ∆′¹⁷O_pclearly differentiate evaporated and non‐evaporated samples. These results begin to establish the natural range of unevaporated ∆′¹⁷O_pvalues in the central Andes and set the foundation for future paleoclimate and paleoaltimetry studies in the region. This study highlights the hydrologic understanding that comes from a combination of δ¹⁸O_p, d‐excess_p, and ∆′¹⁷O_pdata and helps identify the evaporation, recycling, and rainout processes that drive water cycling in the central Andes. 

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2. The Role of Ozone Vibrational Resonances in the Isotope Exchange Reaction ¹⁶ O ¹⁶ O + ¹⁸ O → ¹⁸ O ¹⁶ O + ¹⁶ O: The Time-Dependent Picture

   https://doi.org/10.1021/acs.jpca.9b06139  

   Yuen, Chi Hong; Lapierre, David; Gatti, Fabien; Kokoouline, Viatcheslav; Tyuterev, Vladimir G. (August 2019, The Journal of Physical Chemistry A)
3. Nuclear Structures of ¹⁷ O and Time-dependent Sensitivity of the Weak s -process to the ¹⁶ O( n , γ ) ¹⁷ O Rate

   https://doi.org/10.3847/1538-4357/aba7b4  

   He, Meng; Zhang, Shi-Sheng; Kusakabe, Motohiko; Xu, Sizhe; Kajino, Toshitaka (August 2020, The Astrophysical Journal)
4. ¹⁷ O Labeling Reveals Paired Active Sites in Zeolite Catalysts

   https://doi.org/10.1021/jacs.2c05332  

   Chen, Kuizhi; Zornes, Anya; Nguyen, Vy; Wang, Bin; Gan, Zhehong; Crossley, Steven P.; White, Jeffery L. (September 2022, Journal of the American Chemical Society)
5. Equatorial Undercurrent Influence on Surface Seawater δ ¹⁸ O Values in the Galápagos

   https://doi.org/10.1029/2022GL102074  

   Conroy, Jessica_L; Murray, Nicole_K; Patterson, Gillian_S; Schore, Aiden_I_G; Ikuru, Ima; Cole, Julia_E; Chillagana, David; Echeverria, Fernando (February 2023, Geophysical Research Letters)

   Abstract Stable isotopes of oxygen (δ¹⁸O) in seawater reflect the combined influences of ocean circulation and atmospheric moisture balance. However, it is difficult to disentangle disparate ocean and atmosphere influences on modern seawater δ¹⁸O values, partly because continuous time series of seawater δ¹⁸O are rare. Here we present a nearly nine‐year, continuous record of seawater δ¹⁸O values from the Galápagos. Seawater δ¹⁸O values faithfully track sea surface salinity and salinity along the equator at 50 m depth. Zonal current velocity within the Equatorial Undercurrent (EUC), directly west of the Galápagos, is strongly correlated with Galápagos surface seawater δ¹⁸O values with a 1‐month lag. Reconstructions of Galápagos seawater δ¹⁸O values could thus provide a window into past variations in the strength of the EUC, an important influence on large‐scale tropical Pacific climate. 

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