Automated system measuring triple oxygen and nitrogen isotope ratios in nitrate using the bacterial method and N2O decomposition by microwave discharge

Hattori, Shohei; Savarino, Joël; Kamezaki, Kazuki; Ishino, Sakiko; Dyckmans, Jens; Fujinawa, Tamaki; Caillon, Nicolas; Barbero, Albane; Mukotaka, Arata; Toyoda, Sakae; Well, Reinhard; Yoshida, Naohiro

doi:10.1002/rcm.7747

Cited by 17 publications

(10 citation statements)

References 21 publications

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“…Blank tests ( n = 2) were also carried out by following the identical procedure outlined above (elution, neutralization, and denitrification), and N 2 and O 2 peaks were not observed in isotope ratio mass spectrometer measurements. The correction of constant isotopic shift was applied to all samples (Hattori et al, 2017). In the batch of snow, ice, and water sample measurements, the analytical errors for δ 15 N, δ 17 O, δ 18 O, and Δ 17 O were estimated to be less than 0.2‰, 1.0‰, 1.3‰, and 0.4‰, respectively, based on all nitrate standard measurements in the same batch.…”

Section: Methodsmentioning

confidence: 99%

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A Complete Isotope (δ¹⁵N, δ¹⁸O, Δ¹⁷O) Investigation of Atmospherically Deposited Nitrate in Glacial‐Hydrologic Systems Across the Third Pole Region

et al. 2020

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The Himalayas and Tibetan Plateau, identified as the Third Pole (TP), is a unique region because of its insertion into global environmental and climatic changes. Deposition of atmospheric nitrate in this region is one of the most important sources of reactive nitrogen to glacial-hydrologic system and ecosystems. The isotopic composition of atmospherically deposited nitrate preserved in ice bodies plays a central role in delineating environmental and climatic changes, present, and past. Here, we provide an overview of the complete isotopic compositions (δ 15 N, δ 18 O, and Δ 17 O) of nitrate in aerosol, snow, ice, and water samples (n = 46) collected across the Southern, Southeastern, Central, and Northern TP to constrain complex nitrogen cycles of the atmosphere, cryosphere, hydrosphere, and, potentially, the biosphere. A large variability of snow nitrate isotopic compositions is observed across the TP at different spatial scales (from a single glacier to the entire plateau), likely due to the complex landscape and relevant physical and chemical processes across the TP. Large nitrate Δ 17 O values are observed in water samples collected from the Mt. Everest region, highlighting the considerable fraction (up to 45%) of atmospheric nitrate to the nitrate load in this Himalayan hydrologic system. Our work reveals the complex chemical, depositional, and postdepositional processes over the TP that are greater than previously thought and identifies further comprehensive investigations, which entail using nitrate isotopic compositions as an identifier for nitrate source apportionment in various ecosystems and understanding past atmospheric and climatic conditions in this region. The Himalayas and Tibetan Plateau hosts the largest number of glaciers (>36,000) on the planet outside of polar regions with thousands of lakes and is referred to as the Third Pole (TP) (Yao et al., 2012). This massive water reservoir within this pristine region sustains the water supply and food security for billions of people in ©2020. American Geophysical Union. All Rights Reserved.

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Section: Methodsmentioning

confidence: 99%

“…Journal of Geophysical Research: Atmospheres (ThermoFisher MAT253) in continuous flow mode. Detailed information of the denitrification procedure and automated system may be found in Hattori et al (2017).…”

Section: 1029/2019jd031878mentioning

confidence: 99%

A Complete Isotope (δ¹⁵N, δ¹⁸O, Δ¹⁷O) Investigation of Atmospherically Deposited Nitrate in Glacial‐Hydrologic Systems Across the Third Pole Region

et al. 2020

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“…The nitrogen isotopic composition of NO 3 − is δ 15 N, where δX = R Sample / R Standard − 1 and R is 15 N/ 14 N in the sample or in the standard (atmospheric N 2 for the nitrogen isotope). Nitrogen isotopic composition of nitrate in surface snow at the SE‐Dome region was measured according to method described in Hattori et al (). NO 3 − in the surface snow samples collected in Iizuka et al () were concentrated and separated from other ions using the ion‐chromatographic method described in Ishino et al ().…”

Section: Sample and Analytical Methodsmentioning

confidence: 99%

A 60 Year Record of Atmospheric Aerosol Depositions Preserved in a High‐Accumulation Dome Ice Core, Southeast Greenland

et al. 2018

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The Southeastern Greenland Dome (SE‐Dome) has both a high elevation and a high accumulation rate (1.01 m we yr−1), which are suitable properties for reconstructing past environmental changes with a high time resolution. For this study, we measured the major ion fluxes in a 90 m ice core drilled from the SE‐Dome region in 2015 and present the records of annual ion fluxes from 1957 to 2014. From 1970 to 2010, the trend of nonsea‐salt (nss) SO42− flux decreases, whereas that for NH4+ increases, tracking well with the anthropogenic SOx and NH3 emissions mainly from North America. The result suggests that these fluxes reflect histories of the anthropogenic SOx and NH3 emissions. In contrast, the decadal trend of NO3− flux differs from the decreasing trend of anthropogenic NOx emissions. Although the cause of this discrepancy remains unclear, it may be related to changes in particle formation processes and chemical scavenging rates caused by an increase in sea salt and dust and/or a decrease in nssSO42−. We also find a high average NO3− flux (1.13 mmol m−2 yr−1) in the ice core, which suggests a negligible effect from postdepositional NO3− loss. Thus, the SE‐Dome region is an excellent location for reconstructing nitrate fluxes. Over a decadal time scale, our NO3− flux record is similar to those from other ice cores in Greenland high‐elevation sites, suggesting that NO3− concentration records from these ice cores are reliable.

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“…More recently, Dyckmans et al developed a method based on the conversion of nitrate into N 2 O using bacteria, similar to that of Kaiser et al, but in this case decomposition of N 2 O to N 2 and O 2 is performed by a microwave‐induced plasma in a corundum tube. An automatized version of the Dyckmans et al method was developed by Hattori et al, with overall external Δ 17 O precision of 0.3‰. Finally, Wassemaan et al developed an innovative method based on dissolved NO 3 − reaction with Cd‐azide and analysis of the evolved N 2 O by laser spectroscopy (Table ).…”

Section: Introductionmentioning

confidence: 99%

Triple oxygen isotope analysis of nitrate using isotope exchange cavity ringdown laser spectroscopy

Gázquez

Claire

2018

Rapid Comm Mass Spectrometry

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Automated system measuring triple oxygen and nitrogen isotope ratios in nitrate using the bacterial method and N₂O decomposition by microwave discharge

Cited by 17 publications

References 21 publications

A Complete Isotope (δ¹⁵N, δ¹⁸O, Δ¹⁷O) Investigation of Atmospherically Deposited Nitrate in Glacial‐Hydrologic Systems Across the Third Pole Region

A Complete Isotope (δ¹⁵N, δ¹⁸O, Δ¹⁷O) Investigation of Atmospherically Deposited Nitrate in Glacial‐Hydrologic Systems Across the Third Pole Region

A 60 Year Record of Atmospheric Aerosol Depositions Preserved in a High‐Accumulation Dome Ice Core, Southeast Greenland

Triple oxygen isotope analysis of nitrate using isotope exchange cavity ringdown laser spectroscopy

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Automated system measuring triple oxygen and nitrogen isotope ratios in nitrate using the bacterial method and N2O decomposition by microwave discharge

Cited by 17 publications

References 21 publications

A Complete Isotope (δ15N, δ18O, Δ17O) Investigation of Atmospherically Deposited Nitrate in Glacial‐Hydrologic Systems Across the Third Pole Region

A Complete Isotope (δ15N, δ18O, Δ17O) Investigation of Atmospherically Deposited Nitrate in Glacial‐Hydrologic Systems Across the Third Pole Region

A 60 Year Record of Atmospheric Aerosol Depositions Preserved in a High‐Accumulation Dome Ice Core, Southeast Greenland

Triple oxygen isotope analysis of nitrate using isotope exchange cavity ringdown laser spectroscopy

Contact Info

Product

Resources

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Automated system measuring triple oxygen and nitrogen isotope ratios in nitrate using the bacterial method and N₂O decomposition by microwave discharge

A Complete Isotope (δ¹⁵N, δ¹⁸O, Δ¹⁷O) Investigation of Atmospherically Deposited Nitrate in Glacial‐Hydrologic Systems Across the Third Pole Region

A Complete Isotope (δ¹⁵N, δ¹⁸O, Δ¹⁷O) Investigation of Atmospherically Deposited Nitrate in Glacial‐Hydrologic Systems Across the Third Pole Region