More Like this

1. Pinpointing RNA-Protein Cross-Links with Site-Specific Stable Isotope-Labeled Oligonucleotides

   https://doi.org/10.1021/jacs.5b10596  

   Lelyveld, Victor S. ; Björkbom, Anders ; Ransey, Elizabeth M. ; Sliz, Piotr ; Szostak, Jack W. ( December 2015 , Journal of the American Chemical Society)
2. Natural Potassium (K) Isotope Fractionation during Corn Growth and Quantification of K Fertilizer Recovery Efficiency Using Stable K Isotope Labeling

   https://doi.org/10.1021/acsearthspacechem.2c00105  

   Chen, Xin-Yang ; Zheng, Xin-Yuan ; Beard, Brian L. ; Urrutia, Matilde ; Johnson, Clark M. ; Barak, Phillip ( July 2022 , ACS Earth and Space Chemistry)
3. Size‐Fraction‐Specific Stable Isotope Variations as a Framework for Interpreting Early Eocene Bulk Sediment Carbon Isotope Records

   https://doi.org/10.1029/2020PA004132  

   Bhattacharya, Joyeeta ; Yeung, Laurence Y. ; Cong, Lin ; Dickens, Gerald R. ; Sun, Tao ( May 2021 , Paleoceanography and Paleoclimatology)

   Carbon isotope (δ¹³C) records from marine sediments and sedimentary rocks have been extensively used in Cenozoic chemostratigraphy. The early Paleogene interval in particular has received exceptional attention because negative carbon isotope excursions (CIEs) documented in the sedimentary record, for example, at the Paleocene Eocene Thermal Maximum (PETM), ca ∼56 Ma, are believed to reflect significant global carbon cycle perturbations during the warmest interval of the Cenozoic era. However, while bulk carbonate δ¹³C values exhibit robust correlations across widely separated marine sedimentary basins, their absolute values and magnitude of CIEs vary spatially, especially over time intervals characterized by major deviations in global carbon cycling. Moreover, bulk carbonates in open‐marine environments are an ensemble of different components, each with a distinct isotope composition. Consequently, a comprehensive interpretation of the bulk‐δ¹³C record requires an understanding of co‐evolution of these components. In this study, we dissect sediments, from the late Paleocene‐early Eocene interval, at ODP Site 1209 (Shatsky Rise, Pacific Ocean) to investigate how a temporally varying bulk carbonate ensemble influences the overall carbon isotope record. A set of 45 samples were examined for δ¹³C and δ¹⁸O compositions, as bulk and individual size fractions. We find a significant increase in coarse‐fraction abundance across the PETM, driven by a changing community structure of calcifiers, modulating the size of the CIE at Site 1209 and thus making it distinct from those recorded at other open‐marine sites. These results highlight the importance of biogeography in the marine stable isotope record, especially when isotope excursions are driven by climate‐ and/or carbon cycle changes. In addition, community composition changes will alter the interpretation of weight percent coarse fraction as proxy for carbonate dissolution.

    

   more » « less
4. Adding stable carbon isotopes improves model representation of the role of microbial communities in peatland methane cycling: MODELING STABLE C ISOTOPE IN CH4 CYCLING

   https://doi.org/10.1002/2016MS000817  

   Deng, Jia ; McCalley, Carmody K ; Frolking, Steve ; Chanton, Jeff ; Crill, Patrick ; Varner, Ruth ; Tyson, Gene ; Rich, Virginia ; Hines, Mark ; Saleska, Scott R. ; et al ( June 2017 , Journal of Advances in Modeling Earth Systems)
5. Improving In-Stream Nutrient Routines in Water Quality Models Using Stable Isotope Tracers: A Review and Synthesis

   https://doi.org/10.13031/trans.12545  

   Jensen, Alexandria ; Ford, William ; Fox, James ; Husic, Admin ( January 2018 , Transactions of the ASABE)

   Abstract. Water quality models serve as an economically feasible alternative to quantify fluxes of nutrient pollution and to simulate effective mitigation strategies; however, their applicability is often questioned due to broad uncertainties in model structure and parameterization, leading to uncertain outputs. We argue that reduction of uncertainty is partially achieved by integrating stable isotope data streams within the water quality model architecture. This article outlines the use of stable isotopes as a response variable within water quality models to improve the model boundary conditions associated with nutrient source provenance, constrain model parameterization, and elucidate shortcomings in the model structure. To assist researchers in future modeling efforts, we provide an overview of stable isotope theory; review isotopic signatures and applications for relevant carbon, nitrogen, and phosphorus pools; identify biotic and abiotic processes that impact isotope transfer between pools; review existing models that have incorporated stable isotope signatures; and highlight recommendations based on synthesis of existing knowledge. Broadly, we find existing applications that use isotopes have high efficacy for reducing water quality model uncertainty. We make recommendations toward the future use of sediment stable isotope signatures, given their integrative capacity and practical analytical process. We also detail a method to incorporate stable isotopes into multi-objective modeling frameworks. Finally, we encourage watershed modelers to work closely with isotope geochemists to ensure proper integration of stable isotopes into in-stream nutrient fate and transport routines in water quality models. Keywords: Isotopes, Nutrients, Uncertainty analysis, Water quality modeling, Watershed. 

   more » « less