Nitrogen cycle
Soil HONO flux depends on an equilibrium concentration
Open access · cc by · source: Europe PMC
Soil–air nitrous acid exchange is set by an equilibrium gas-phase concentration over soil ([HONO]*) versus ambient HONO, so soils can emit or take up HONO as they dry.
Key findings
[HONO]* peaked near 31 ppb at 0.04 kg kg−1 water (10% WHC). Chamber fluxes ranged from −31.1 to 68.6 ng N m−2 s−1. At 0 ppb inlet, soils always emitted HONO; at 5–15 ppb they first deposited then could emit as they dried.
Methodology
Authors ran controlled dynamic-chamber experiments on drying soil, switching inlet HONO among 0, 5, and 15 ppb to derive [HONO]* and chamber fluxes across soil water contents.
Limitations
A chamber study on sampled soil does not map real-world field fluxes across land uses; predicted atmospheric fluxes still depend on assumed transfer velocity and ambient HONO.
How this study connects
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Evidence for the claim as stated.
Soil–air nitrous acid exchange is set by an equilibrium gas-phase concentration over soil ([HONO]*) versus ambient HONO, so soils can emit or take up HONO as they dry.
Evidence for the claim as stated.
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