ArticleScientific reports2025
Temporal changes of headwater river surface microlayer characteristics during the dry to wet season transition in the tropical rainforest of Guyana.
Article in Scientific reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The surface microlayer (SML) is a fundamental control of energy transfer, biogeochemical processes, and climate-active gases flux at the water-atmosphere interface. Organic matter in the SML has an important role in marine environments but inland waters have received far less attention. This results in large unknowns of SML variability and its impact on boundary layer exchanges. In this study, we investigate variations in dissolved organic carbon (DOC) and dissolved organic matter (DOM) composition in SML and subsurface water (SSW) using size exclusion chromatography in a Northern Amazonia rainforest headwater during the dry to wet season transition. During the dry season, we observed higher DOC concentrations with greater DOM compositional variability, characterised by lower humic substance (HS) abundance and elevated contributions of biopolymers (BP), building blocks (BB), and low-molecular-weight neutrals and acids (LMWN, LMWA). River discharge and DOC flux increased in the wet season. However, the overall DOC concentration decreased accompanied by DOM homogenisation, a dominance of HS, and the disappearance of LMWA. The SML and SSW exhibited similar DOC concentrations but distinct compositional differences, evidenced by divergent HS-DOC relationships and HS nominal molecular weight (M
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