More information and download links below the graphic.
Illustration of the role of UV radiation in the biogeochemical cycling of DOC
Click here, or on the graphic, for full resolution.
Illustration of the role of UV radiation in the biogeochemical cycling of DOC
| Sources | Title (cont.) Under the influence of solar UV light, dissolved humic matter (DHM, organic matter largely derived from terrestrial ecosystems) in streams, lakes and coastal marine waters can be transformed to CO2. This can occur through purely abiotic photooxidation of DHM or through photolysis (cleavage) of DHM into smaller molecules more easily utilizable as a substrate for aquatic bacteria than the original high molecular weight DHM. Increased availability of bacterial substrate then leads to enhanced CO2 production through bacterial respiration. However, direct negative effects of UV light on bacteria, causing reduced growth and respiration, also influences the process. The balance between these separate processes in nature is unknown. (AAR Figure 11.22) | ||||
|
Cartographer/ Designer |
Graphical production: Philippe Rekacewicz and Emmanuelle Bournay (GRID-Arendal) | ||||
| Appears in |
AMAP Assessment Report: Arctic Pollution Issues |
||||
| Published | 1998 | ||||
| Feedback/Comment/Inquiry | Contact webmaster | ||||
| Search for other graphics |
With related subjects Covering the same geographic area |
||||
|
Available Downloads
(please review use constraints above) |
|
||||
|
Citation/Reference Use constraints |
Please refer to the AMAP policy regarding use and reproduction of AMAP maps and graphics |
