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- Title
Emission of nitrous acid from soil and biological soil crusts represents a dominant source of HONO in the remote atmosphere in Cyprus.
- Authors
Meusel, Hannah; Tamm, Alexandra; Kuhn, Uwe; Wu, Dianming; Leifke, Anna Lena; Fiedler, Sabine; Ruckteschler, Nina; Yordanova, Petya; Lang-Yona, Naama; Lelieveld, Jos; Hoffmann, Thorsten; Pöschl, Ulrich; Hang Su; Weber, Bettina; Yafang Cheng
- Abstract
Soil and biological soil crusts can emit nitrous acid (HONO) and nitric oxide (NO). The terrestrial ground surface in arid and semi-arid regions is anticipated to play an important role in the local atmospheric HONO budget, deemed to represent one of the unaccounted HONO sources frequently observed in field studies. In this study HONO and NO emissions from a representative variety of soil and biological soil crust samples from the Mediterranean island Cyprus were investigated under controlled laboratory conditions. A wide range of fluxes was observed, ranging from 0.6 to 264ngm-2s-1 HONO-N at optimal soil water content (20-30% of water holding capacity, WHC). Maximum NO-N at this WHC fluxes were lower (0.8-121ngm-2s-1). Highest emissions of both reactive nitrogen species were found from bare soil, followed by light and dark cyanobacteria-dominated biological soil crusts (biocrusts), correlating well with the sample nutrient levels (nitrite and nitrate). Extrapolations of lab-based HONO emission studies agree well with the unaccounted HONO source derived previously for the extensive CYPHEX field campaign, i.e., emissions from soil and biocrusts may essentially close the Cyprus HONO budget.
- Subjects
CYPRUS; REMOTE sensing of the atmosphere; ATMOSPHERIC sciences; NONCARBOXYLIC acids; EARTH system science; ECOLOGY
- Publication
Atmospheric Chemistry & Physics Discussions, 2017, p1
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acp-2017-356