TY - JOUR
T1 - Dissolved and Particulate Organic Carbon Characteristics in Summer and Winter Waters of the Lena Delta
AU - Ogneva, Olga
AU - Mollenhauer, Gesine
AU - Sanders, Tina
AU - Juhls, Bennet
AU - Palmtag, Juri
AU - Fuchs, Michael
AU - Hammes, J.
AU - Grotheer, Hendrik
AU - Mann, Paul
AU - Opfergelt, Sophie
AU - Strauss, Jens
N1 - Research funding
Bundesministerium für Bildung und Forschung. Grant Numbers: 03F0806A, 03F0809A
European Space Agency. Grant Number: 4000l3376l/2l/I-NB
Germany’s Excellence Strategy. Grant Number: EXC-2077–390741603
Natural Environment Research Council. Grant Number: NE/R012806/1
Article funding
Open Access funding enabled and organized by Projekt DEAL.
PY - 2026/1/8
Y1 - 2026/1/8
N2 - Rapid Arctic warming accelerates permafrost thaw, altering water flow and organic matter transport to aquatic ecosystems. To identify sources and seasonality of OC at the mouth of the Lena River, we measured summer and winter concentrations and C isotopes (∆14C and δ13C) of DOC and POC along a 140-km transect of the Lena Delta. Despite low water flow during winter, DOC concentrations in the Lena Delta were higher than those measured at the end of the summer (6.31 ± 0.60 and 5.54 ± 0.17 mg L−1, respectively). We found pronounced differences in the DOC isotopic composition of waters between seasons (winter: mean = −16‰ ± 16‰ ranging between −14‰ and 46‰ and summer: mean = 41‰ ± 26‰ in the range between −47‰ and 79‰). ∆14C of winter DOC suggested higher relative contributions of older carbon compared to summer DOC, which is enriched in 14C. POC in winter was lower (0.13 ± 0.06 and 0.40 ± 0.10 mgC L−1, respectively) and enriched in δ13C (−29.7 ± 2.2 and −32.4‰ ± 0.8‰, respectively) compared to summer, while no difference was found for ∆14C. This study with its unique dataset on the largest Arctic delta will help to assess the ongoing changes with climate warming at this frontier between the land and the ocean realm. Explicitly, the inclusion of winter sampling and isotopic analysis makes this study very valuable for assessing the biogeochemical response of the Arctic's biggest delta, as well as beyond.
AB - Rapid Arctic warming accelerates permafrost thaw, altering water flow and organic matter transport to aquatic ecosystems. To identify sources and seasonality of OC at the mouth of the Lena River, we measured summer and winter concentrations and C isotopes (∆14C and δ13C) of DOC and POC along a 140-km transect of the Lena Delta. Despite low water flow during winter, DOC concentrations in the Lena Delta were higher than those measured at the end of the summer (6.31 ± 0.60 and 5.54 ± 0.17 mg L−1, respectively). We found pronounced differences in the DOC isotopic composition of waters between seasons (winter: mean = −16‰ ± 16‰ ranging between −14‰ and 46‰ and summer: mean = 41‰ ± 26‰ in the range between −47‰ and 79‰). ∆14C of winter DOC suggested higher relative contributions of older carbon compared to summer DOC, which is enriched in 14C. POC in winter was lower (0.13 ± 0.06 and 0.40 ± 0.10 mgC L−1, respectively) and enriched in δ13C (−29.7 ± 2.2 and −32.4‰ ± 0.8‰, respectively) compared to summer, while no difference was found for ∆14C. This study with its unique dataset on the largest Arctic delta will help to assess the ongoing changes with climate warming at this frontier between the land and the ocean realm. Explicitly, the inclusion of winter sampling and isotopic analysis makes this study very valuable for assessing the biogeochemical response of the Arctic's biggest delta, as well as beyond.
UR - https://www.scopus.com/pages/publications/105024812549
U2 - 10.1002/ppp.70021
DO - 10.1002/ppp.70021
M3 - Article
SN - 1045-6740
VL - 37
SP - 154
EP - 166
JO - Permafrost and Periglacial Processes
JF - Permafrost and Periglacial Processes
IS - 1
ER -