| Full text | |
| Author(s): Show less - |
Haeggi, C.
[1, 2, 3]
;
Hopmans, E. C.
[2]
;
Schefuss, E.
[1]
;
Sawakuchi, A. O.
[4]
;
Schreuder, L. T.
[2]
;
Bertassoli, D. J. Jr Jr
;
Chiessi, C. M.
[5]
;
Mulitza, S.
[1]
;
Sawakuchi, H. O.
[6]
;
Baker, P. A.
[7]
;
Schouten, S.
[2, 8]
Total Authors: 11
|
| Affiliation: | [1] Univ Bremen, MARUM Ctr Marine Environm Sci, Bremen - Germany
[2] Royal Netherlands Inst Sea Res, Dept Marine Microbiol & Biogeochem MMB, NIOZ, Den Burg - Netherlands
[3] Swiss Fed Inst Technol, Dept Earth Sci, Zurich - Switzerland
[4] Univ Sao Paulo, Inst Geosci, Sao Paulo - Brazil
[5] Bertassoli, Jr., D. J. Jr Jr, Univ Sao Paulo, Sch Arts Sci & Humanities, Sao Paulo - Brazil
[6] Linkoping Univ, Dept Themat Studies Environm Change, Linkoping - Sweden
[7] Duke Univ, Div Earth & Ocean Sci, Durham, NC - USA
[8] Univ Utrecht, Fac Geosci, Dept Earth Sci, Utrecht - Netherlands
Total Affiliations: 8
|
| Document type: | Journal article |
| Source: | GLOBAL BIOGEOCHEMICAL CYCLES; v. 35, n. 9 SEP 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
Particulate pyrogenic carbon (PyC) transported by rivers and aerosols, and deposited in marine sediments, is an important part of the carbon cycle. The chemical composition of PyC is temperature dependent and levoglucosan is a source-specific burning marker used to trace low-temperature PyC. Levoglucosan associated to particulate material has been shown to be preserved during riverine transport and marine deposition in high- and mid-latitudes, but it is yet unknown if this is also the case for (sub)tropical areas, where 90% of global PyC is produced. Here, we investigate transport and deposition of levoglucosan in suspended and riverbed sediments from the Amazon River system and adjacent marine deposition areas. We show that the Amazon River exports negligible amounts of levoglucosan and that concentrations in sediments from the main Amazon tributaries are not related to long-term mean catchment-wide fire activity. Levoglucosan concentrations in marine sediments offshore the Amazon Estuary are positively correlated to total organic content regardless of terrestrial or marine origin, supporting the notion that association of suspended or dissolved PyC to biogenic particles is critical in the preservation of PyC. We estimate that 0.5-10 x 10(6) g yr(-1) of levoglucosan is exported by the Amazon River. This represents only 0.5-10 ppm of the total exported PyC and thereby an insignificant fraction, indicating that riverine derived levoglucosan and low-temperature PyC in the tropics are almost completely degraded before deposition. Hence, we suggest caution in using levoglucosan as tracer for past fire activity in tropical settings near rivers. (AU) | |
| FAPESP's process: | 19/24977-0 - Environmental signals recorded in modern sediments of tropical South American rivers |
| Grantee: | Dailson José Bertassoli Junior |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 16/02656-9 - The response of sedimentary dynamics of the Xingu and Tapajós rivers to climate changes and hydropower dams: risks for biodiversity conservation and energy production in Amazonia |
| Grantee: | André Oliveira Sawakuchi |
| Support Opportunities: | Research Program on Global Climate Change - Regular Grants |
| FAPESP's process: | 19/24349-9 - Assessing the effects of past and future climate change on Amazonian biodiversity (CLAMBIO) |
| Grantee: | Cristiano Mazur Chiessi |
| Support Opportunities: | BIOTA-FAPESP Program - Regular Research Grants |
| FAPESP's process: | 18/23899-2 - Trans-Amazon Drilling Project: origin and evolution of the forests, climate, and hydrology of the South American tropics |
| Grantee: | André Oliveira Sawakuchi |
| Support Opportunities: | Research Program on Global Climate Change - Thematic Grants |
| FAPESP's process: | 18/15123-4 - Past perspectives on tipping elements of the climate system: the Amazon Rainforest and the Atlantic Meridional Overturning Circulation (PPTEAM) |
| Grantee: | Cristiano Mazur Chiessi |
| Support Opportunities: | Research Grants - Research Program on Global Climate Change - Young Investigators - Phase 2 |
| FAPESP's process: | 11/06609-1 - Provenance, transport and storage of sediments in Amazon rivers |
| Grantee: | André Oliveira Sawakuchi |
| Support Opportunities: | Regular Research Grants |