English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Abstract. The Arctic is rapidly changing, disrupting biogeochemical cycles and theprocessing, delivery and sedimentation of carbon (C), in linkedterrestrial–aquatic systems. In this investigation, we coupled ahydrogeomorphic assessment of catchment soils, sediments and plants with arecent lake sediment sequence to understand the source and quality of organiccarbon present in three Arctic upland lake catchments on Disko Island, locatedjust south of the low–high Arctic transition zone. This varied permafrostlandscape has exposed soils with less vegetation cover at higher altitudes,and lakes received varying amounts of glacial meltwater inputs. We provideimproved isotope and biomarker source identifications for palaeolimnologicalstudies in high-latitude regions, where terrestrial vegetation is at or closeto its northerly and altitudinal range limit. The poorly developed catchmentsoils lead to lake waters with low dissolved organic carbon (DOC)concentrations ( ≤1.5 mg L−1 ). Sedimentary carbon / nitrogen(C / N) ratios, the C isotope composition of organic matter( δ13Corg ) and biomarker ratios ( n -alkanes, n -alkanols, n -alkanoic acids and sterols) showed that sedimentary organic matter (OM) inthese lakes is mostly derived from aquatic sources (algae and macrophytes). Weused a 210Pb -dated sediment core to determine how carbon cycling ina lake–catchment system (Disko 2) had changed over recent centuries. Recentwarming since the end of the Little Ice Age ( LIA∼1860 CE ), which accelerated after ca. 1950, led to melt of glacierice and permafrost, releasing nutrients and DOC to the lake and stimulatingpronounced aquatic algal production, as shown by a >10 -fold increase in β -carotene, indicative of a major regime shift. We also demonstratethat recent increases in catchment terrestrial vegetation cover contributed tothe autochthonous response. Our findings highlight that in Arctic lakes withsparsely developed catchment vegetation and soils, recent Anthropocene warmingresults in pronounced changes to in-lake C processing and the deposition ofmore reactive, predominately autochthonous C, when compared with extensivelyvegetated low-Arctic systems.

Anthropocene climate warming enhances autochthonous carbon cycling in an upland Arctic lake, Disko Island, West Greenland