Fluxes of nitrates between snow surfaces and the atmosphere in the European high arctic

• Main Authors: Beine, H. J., Dominé, F., Ianniello, A., Nardino, M., Allegrini, I., Teinilä, K., Hillamo, R.
• Other Authors: C.N.R., Laboratoire de glaciologie et géophysique de l'environnement (LGGE), Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Finnish Meteorological Institute (FMI)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2006
• Subjects: [SDU.OCEAN]Sciences of the Universe [physics]/Ocean; Atmosphere; Arctic; Greenland; Nunavut; Svalbard
• Online Access: https://hal.science/hal-00327794; https://hal.science/hal-00327794/document; https://hal.science/hal-00327794/file/acpd-3-75-2003.pdf

International audience Measurements of atmospheric and snow mixing ratios of nitrates and nitrites and their fluxes above the snow surface were made during two intensive campaigns during spring time 2001 at Ny-Alesund, Svalbard as part of the EU project ``The NItrogen Cycle and Effects on the oxidation of atmospheric trace species at high latitudes" (NICE). At this coastal site close to the unseasonably unfrozen fjord of the measured nitrogen species only HNO 3 showed a significant flux above the snow surface; a mean deposition of -8.7\,nmol\,h -1 m -2 was observed in late April/early May 2001. These fluxes may be due to the reaction of HNO 3 with sea salt, and especially NaCl, or may be simply uptake of HNO 3 by ice, which is alkaline because of the sea salt in our marine environment. During snowfall periods dry deposition of HNO 3 may contribute up to 10% of the N budget in the snow; however, the main source for N is wet deposition in falling snow. The surface snow at Ny-Alesund showed very complex stratigraphy; the NO 3 - mixing ratio in snow varied between 65 and 520\,ng\,g -1 , the total NO 3 - content of the snowpack was on the order of 2700 ng cm -2 . In comparison the atmospheric boundary layer column showed a NO 3 - content of only 8\,ng\,cm -2 . The limited exchange, however, between the snow and the atmosphere was attributed to low mobility of NO 3 - in the observed snow. Contrary to other Arctic sites (i.e. Alert, Nunavut or Summit, Greenland) deposition of sea salt and crustal aerosols in this marine environment made the surface snow alkaline; snow NO 3 - was associated with heavier cations and was not readily available for physical exchange or photochemical reactions.