Surface water Dissolved Organic Matter (DOC, CDOM) in the Laptev Sea and Lena River

River water is the main source of dissolved organic carbon (DOC) in the Arctic Ocean. DOC plays and important role in the Arctic carbon cycle and its export from land to sea is expected to increase with accelerated permafrost thaw with ongoing climate change. However, transport ways and transformation of DOC is mostly unknown. The absorption coefficient by colored dissolved organic matter (aCDOM) which can be used to estimate DOC concentration. In this study, we compiled DOC and aCDOM samples from 11 expeditions covering river, coastal and offshore waters. Water samples for DOC analysis were filtered through 0.7µm GF/F filter and acidified with 25 µL HCl suprapur (10 M) right after sampling. Samples were stored cool and dark for transport. DOC concentrations were measured using high temperature catalytic oxidation (TOC-VCPH, Shimadzu). Three measurements of each sample were averaged and after each 10 samples, a blank and a standard (Battle-02, Mauri-09 or Super-05 certified reference material from National Laboratory for Environmental Testing, Canada) were measured to sustain a quality control. Samples for aCDOM(λ) analysis were filtered through 0.22 µm Millipore GSWP filters (Gonçalves-Araujo et al., 2015, Lena 2016, Bykovksy 2017) or 0.7 µm Whatman GF/F (LD10, YS11, VB13, VB14, Lena 2014, Lena 2015) right after sampling. 100 ml filtrate was stored cool and dark in amber glass bottles until further analysis. aCDOM(λ) was measured with spectrophotometer (SPECORD 200, Analytik Jena) by measuring the absorbance (Aλ) in 1 nm intervals between 200 and 750 nm. The resulting absorbance measurements were then applied to a standard equation aCDOM (λ)=(2.303*A_λ)/L, where L is the path length (length of cuvette), to calculate the aCDOM(λ). Fresh Milli-Q water was used as reference. The cuvette length varied depending on the expected absorption in the sampled water (1 or 5 cm for river or coastal waters, 5 or 10 cm for offshore shelf waters). Resulting aCDOM spectra were corrected for baseline offsets by subtracting the absorption at 700 nm, assuming zero absorption at 700 nm.

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Cite this as

Juhls, Bennet, Hölemann, Jens A, Heim, Birgit, Overduin, Pier Paul, Gonçalves-Araujo, Rafael, Hieronymi, Martin, Fischer, Jürgen (2019). Dataset: Surface water Dissolved Organic Matter (DOC, CDOM) in the Laptev Sea and Lena River. https://doi.org/10.1594/PANGAEA.898813

DOI retrieved: 2019

Additional Info

Field Value
Imported on November 30, 2024
Last update November 30, 2024
License CC-BY-4.0
Source https://doi.org/10.1594/PANGAEA.898813
Author Juhls, Bennet
Given Name Bennet
Family Name Juhls
More Authors
Hölemann, Jens A
Heim, Birgit
Overduin, Pier Paul
Gonçalves-Araujo, Rafael
Hieronymi, Martin
Fischer, Jürgen
Source Creation 2019
Publication Year 2019
Resource Type application/zip - filename: Juhls-etal_2019
Subject Areas
Name: Ecology

Name: Lithosphere

Related Identifiers
Title: Dissolved organic matter at the fluvial–marine transition in the Laptev Sea using in situ data and ocean colour remote sensing
Identifier: https://doi.org/10.5194/bg-16-2693-2019
Type: DOI
Relation: IsSupplementTo
Year: 2019
Source: Biogeosciences
Authors: Juhls Bennet , Overduin Pier Paul , Hölemann Jens A , Hieronymi Martin , Matsuoka Atsushi , Heim Birgit , Fischer Jürgen .