Glacial/interglacial changes in the isotopes of nitrate from the Greenland Ice Sheet Project 2 (GISP2) ice core
Abstract
The 15 N/14 N and 18 O/16 O ratios of nitrate in the Greenland Ice Sheet Project 2 (GISP2) (Summit, Greenland) ice core are much higher in ice from the last glacial period than in the pre‐industrial Holocene, despite the lack of a significant glacial/interglacial change in nitrate concentration. While both the 15 N/14 N and 18 O/16 O records are anticorrelated with snow accumulation rate, neither is satisfactorily explained by accumulation changes or post‐depositional processes. The similarity in the glacial/interglacial change in 15 N/14 N from several different Greenland ice cores and the large amplitude of this change relative to observed seasonal variation raise the possibility that the isotopes of nitrate in ice cores indicate a large‐scale glacial/interglacial change in the isotopic composition of atmospheric NOx. The glacial/interglacial change in 18 O/16 O is best explained by a greater contribution of HNO 3 production from hydrolysis of N 2 O 5, which has implications for reconstruction of past atmospheric oxidant levels. Although isotope effects associated with NOx photochemistry and nitrate scavenging have not been fully characterized, the 15 N/14 N data may indicate glacial/interglacial changes in the relative contributions from different natural sources of NOx on a hemispheric or global scale.
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Self-citation
- Authors
- Hastings, M. G., Sigman, D. M., & Steig, E. J.
- Affiliations
- Princeton University (US)
- University of Washington (US)
- Venue
- Global Biogeochemical Cycles
- Publisher
- American Geophysical Union (AGU)
- Published
- 2005-12
- Volume
- 19
- Issue
- 4
- ISSN
- 0886-6236 (ISSN-L)
- 1944-9224
- OpenAlex
- W1559227392
- Cited by
- 73
- References
- 92
- Citations by year
- 2026: 1 · 2025: 2 · 2024: 4 · 2023: 2 · 2022: 8 · 2021: 17 · 2019: 1 · 2018: 2 · 2016: 5 · 2015: 4 · 2014: 6 · 2013: 2
- FWCI
- 2.33
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Global Biogeochemical Cycles (publishedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Geology and Paleoclimatology Research
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Atmospheric chemistry and aerosols
- Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Groundwater and Isotope Geochemistry
- Keywords
- nitrate isotopes, 15N/14N ratio, 18O/16O ratio, glacial-interglacial cycles, GISP2 ice core, nitric acid, N2O5 hydrolysis, atmospheric NOx, snow accumulation rate, isotope effects, Holocene, last glacial period
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