Morin, Samuel; Savarino, Joël; Frey, Markus M; Domine, Florent; Jacobi, Hans-Werner; Kaleschke, Lars; Martins, Jean MF (2009): Atmospheric nitrate concentrations and isotope composition for samples collected in the marine boundary layer in 2006 and 2007 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.848933, Supplement to: Morin, S et al. (2009): Comprehensive isotopic composition of atmospheric nitrate in the Atlantic Ocean boundary layer from 65°S to 79°N. Journal of Geophysical Research, 114(D5), https://doi.org/10.1029/2008JD010696
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Abstract:
The comprehensive isotopic composition of atmospheric nitrate (i.e., the simultaneous measurement of all its stable isotope ratios: 15N/14N, 17O/16O and 18O/16O) has been determined for aerosol samples collected in the marine boundary layer (MBL) over the Atlantic Ocean from 65°S (Weddell Sea) to 79°N (Svalbard), along a ship-borne latitudinal transect. In nonpolar areas, the d15N of nitrate mostly deriving from anthropogenically emitted NOx is found to be significantly different (from 0 to 6 per mil) from nitrate sampled in locations influenced by natural NOx sources (-4 ± 2) per mil. The effects on d15N(NO3-) of different NOx sources and nitrate removal processes associated with its atmospheric transport are discussed. Measurements of the oxygen isotope anomaly (D17O = d17O - 0.52 × d18O) of nitrate suggest that nocturnal processes involving the nitrate radical play a major role in terms of NOx sinks. Different D17O between aerosol size fractions indicate different proportions between nitrate formation pathways as a function of the size and composition of the particles. Extremely low d15N values (down to -40 per mil) are found in air masses exposed to snow-covered areas, showing that snowpack emissions of NOx from upwind regions can have a significant impact on the local surface budget of reactive nitrogen, in conjunction with interactions with active halogen chemistry. The implications of the results are discussed in light of the potential use of the stable isotopic composition of nitrate to infer atmospherically relevant information from nitrate preserved in ice cores.
Project(s):
Funding:
German Research Foundation (DFG), grant/award no. 5472008: Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas
Coverage:
Median Latitude: 9.525776 * Median Longitude: -5.851425 * South-bound Latitude: -65.090000 * West-bound Longitude: -57.420000 * North-bound Latitude: 78.925600 * East-bound Longitude: 11.960000
Date/Time Start: 2006-02-15T00:00:00 * Date/Time End: 2007-05-03T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets
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Datasets listed in this publication series
- Morin, S; Savarino, J; Frey, MM et al. (2009): (Supplementary Table 2) Atmospheric nitrate concentrations and isotope composition for samples collected in the marine boundary layer during POLARSTERN cruise ANT-XXIII/7 to the South Atlantic Ocean, Sept.-Oct. 2006. https://doi.org/10.1594/PANGAEA.848931
- Morin, S; Savarino, J; Frey, MM et al. (2009): (Supplementary Table 3) Atmospheric nitrate concentrations and isotope composition for samples collected in the marine boundary layer during POLARSTERN cruise ANT-XXIII/10 to the Atlantic Ocean (transect), April-May 2007. https://doi.org/10.1594/PANGAEA.848932
- Morin, S; Savarino, J; Frey, MM et al. (2009): (Supplementary Table 1) Atmospheric nitrate concentrations and isotope composition for samples collected in the marine boundary layer at Ny Alesund, Svalbard, Spring 2006. https://doi.org/10.1594/PANGAEA.848930