Sunlight drives the abiotic formation of nitrous oxide in fresh and marine waters.
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| Main Authors: | , , , , |
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| Format: | Artículo científico |
| Language: | en |
| Published: |
Science (New York, N.Y.)
2025
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| _version_ | 1868266232019419138 |
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| author | Leon-Palmero, Elizabeth Morales-Baquero, Rafael Thamdrup, Bo Löscher, Carolin Reche, Isabel |
| author_facet | Leon-Palmero, Elizabeth Morales-Baquero, Rafael Thamdrup, Bo Löscher, Carolin Reche, Isabel Leon-Palmero, Elizabeth Morales-Baquero, Rafael Thamdrup, Bo Löscher, Carolin Reche, Isabel |
| collection | PubMed - marine biology |
| contents | Sunlight drives the abiotic formation of nitrous oxide in fresh and marine waters. Leon-Palmero, Elizabeth Morales-Baquero, Rafael Thamdrup, Bo Löscher, Carolin Reche, Isabel Nitrous oxide (NO) is a potent greenhouse gas and the main stratospheric ozone-depleting agent, yet its sources are not well resolved. In this work, we experimentally show a NO production pathway not previously considered in greenhouse gas budgets, which we name photochemodenitrification. Sunlight induces substantial and consistent NO production under oxic abiotic conditions in fresh and marine waters. We measured photochemical NO production rates using isotope tracers and determined that nitrite is the main substrate and that nitrate can also contribute after being photoreduced to nitrite. Additionally, this NO production was strongly correlated to the radiation dose. Photochemodenitrification exceeded biological NO production in surface waters. Although previously overlooked, this process may contribute considerably to global NO emissions through its occurrence in fresh and marine surface waters. |
| format | Artículo científico |
| id | pubmed_40080575 |
| institution | PubMed |
| language | en |
| publishDate | 2025 |
| publisher | Science (New York, N.Y.) |
| record_format | pubmed |
| spellingShingle | Sunlight drives the abiotic formation of nitrous oxide in fresh and marine waters. Leon-Palmero, Elizabeth Morales-Baquero, Rafael Thamdrup, Bo Löscher, Carolin Reche, Isabel Sunlight drives the abiotic formation of nitrous oxide in fresh and marine waters. Leon-Palmero, Elizabeth Morales-Baquero, Rafael Thamdrup, Bo Löscher, Carolin Reche, Isabel Nitrous oxide (NO) is a potent greenhouse gas and the main stratospheric ozone-depleting agent, yet its sources are not well resolved. In this work, we experimentally show a NO production pathway not previously considered in greenhouse gas budgets, which we name photochemodenitrification. Sunlight induces substantial and consistent NO production under oxic abiotic conditions in fresh and marine waters. We measured photochemical NO production rates using isotope tracers and determined that nitrite is the main substrate and that nitrate can also contribute after being photoreduced to nitrite. Additionally, this NO production was strongly correlated to the radiation dose. Photochemodenitrification exceeded biological NO production in surface waters. Although previously overlooked, this process may contribute considerably to global NO emissions through its occurrence in fresh and marine surface waters. |
| title | Sunlight drives the abiotic formation of nitrous oxide in fresh and marine waters. |
| url | https://pubmed.ncbi.nlm.nih.gov/40080575/ |