| Title | Spatial and Temporal Patterns in Atmospheric Deposition of Dissolved Organic Carbon |
| Abstract | Atmospheric deposition of dissolved organic carbon (DOC) to terrestrial ecosystems is a small, but rarely studied component of the global carbon (C) cycle. Emissions of volatile organic compounds (VOC) and organic particulates are the sources of atmospheric C and deposition represents a major pathway for the removal of organic C from the atmosphere. Here, we evaluate the spatial and temporal patterns of DOC deposition using 70 data sets at least one year in length ranging from 40 degrees south to 66 degrees north latitude. Globally, the median DOC concentration in bulk deposition was 1.7 mg L-1. The DOC concentrations were significantly higher in tropical (<25 degrees) latitudes compared to temperate (>25 degrees) latitudes. DOC deposition was significantly higher in the tropics because of both higher DOC concentrations and precipitation. Using the global median or latitudinal specific DOC concentrations leads to a calculated global deposition of 202 or 295 Tg C yr(-1) respectively. Many sites exhibited seasonal variability in DOC concentration. At temperate sites, DOC concentrations were higher during the growing season; at tropical sites, DOC concentrations were higher during the dry season. Thirteen of the thirty-four long-term (>10 years) data sets showed significant declines in DOC concentration over time with the others showing no significant change. Based on the magnitude and timing of the various sources of organic C to the atmosphere, biogenic VOCs likely explain the latitudinal pattern and the seasonal pattern at temperate latitudes while decreases in anthropogenic emissions are the most likely explanation for the declines in DOC concentration. |
| Source | Global biogeochemical cycles 36 (10) |
| Keywords | dissolved organic carbonatmospheric depositionprecipitation chemistrycarbon cyclingglobal synthesis |
| Journal | Global biogeochemical cycles |
| Editor | American Geophysical Union,, Washington, DC, Stati Uniti d'America |
| Year | 2022 |
| Type | Articolo in rivista |
| DOI | 10.1029/2022GB007393 |
| Authors | Liptzin, Daniel; Boy, Jens; Campbell, John L.; Clarke, Nicholas; Laclau, Jean-Paul; Godoy, Roberto; Johnson, Sherri L.; Kaiser, Klaus; Likens, Gene E.; Karlsson, Gunilla Pihl; Markewitz, Daniel; Rogora, Michela; Sebestyen, Stephen D.; Shanley, James B.; Vanguelova, Elena; Verstraeten, Arne; Wilcke, Wolfgang; Worrall, Fred; McDowell, William H. |
| Text | 477471 2022 10.1029/2022GB007393 ISI Web of Science WOS 000870576400001 dissolved organic carbon atmospheric deposition precipitation chemistry carbon cycling global synthesis Spatial and Temporal Patterns in Atmospheric Deposition of Dissolved Organic Carbon Liptzin, Daniel; Boy, Jens; Campbell, John L.; Clarke, Nicholas; Laclau, Jean Paul; Godoy, Roberto; Johnson, Sherri L.; Kaiser, Klaus; Likens, Gene E.; Karlsson, Gunilla Pihl; Markewitz, Daniel; Rogora, Michela; Sebestyen, Stephen D.; Shanley, James B.; Vanguelova, Elena; Verstraeten, Arne; Wilcke, Wolfgang; Worrall, Fred; McDowell, William H. Univ New Hampshire; Soil Hlth Inst; Leibniz Univ Hannover; US Forest Serv; Norwegian Inst Bioecon Res NIBIO; Univ Montpellier; Univ Austral Chile; US Forest Serv; Martin Luther Univ Halle Wittenberg; Cary Inst Ecosyst Studies; IVL Swedish Environm Res Inst; Univ Georgia; Natl Res Council Italy; US Forest Serv; US Geol Survey; Forest Res; Res Inst Nat Forest LNBO; Karlsruhe Inst Technol KIT; Univ Durham Atmospheric deposition of dissolved organic carbon DOC to terrestrial ecosystems is a small, but rarely studied component of the global carbon C cycle. Emissions of volatile organic compounds VOC and organic particulates are the sources of atmospheric C and deposition represents a major pathway for the removal of organic C from the atmosphere. Here, we evaluate the spatial and temporal patterns of DOC deposition using 70 data sets at least one year in length ranging from 40 degrees south to 66 degrees north latitude. Globally, the median DOC concentration in bulk deposition was 1.7 mg L 1. The DOC concentrations were significantly higher in tropical <25 degrees latitudes compared to temperate >25 degrees latitudes. DOC deposition was significantly higher in the tropics because of both higher DOC concentrations and precipitation. Using the global median or latitudinal specific DOC concentrations leads to a calculated global deposition of 202 or 295 Tg C yr 1 respectively. Many sites exhibited seasonal variability in DOC concentration. At temperate sites, DOC concentrations were higher during the growing season; at tropical sites, DOC concentrations were higher during the dry season. Thirteen of the thirty four long term >10 years data sets showed significant declines in DOC concentration over time with the others showing no significant change. Based on the magnitude and timing of the various sources of organic C to the atmosphere, biogenic VOCs likely explain the latitudinal pattern and the seasonal pattern at temperate latitudes while decreases in anthropogenic emissions are the most likely explanation for the declines in DOC concentration. 36 Published version Articolo in rivista American Geophysical Union, 0886 6236 Global biogeochemical cycles Global biogeochemical cycles Glob. biogeochem. cycles Global biogeochemical cycles. michela.rogora ROGORA MICHELA TA.P02.014.002 Impatto dei cambiamenti globali sugli ecosistemi acquatici |
