Sulfurization of dissolved organic matter in the anoxic water column of the Black Sea

被引：59

作者：

Gomez-Saez, Gonzalo V. ^{[1
,2
]}

Dittmar, Thorsten ^{[1
,3
]}

Holtappels, Moritz ^{[2
,4
,5
]}

Pohlabeln, Anika M. ^{[1
]}

Lichtschlag, Anna ^{[4
,6
]}

Schnetger, Bernhard ^{[1
]}

Boetius, Antje ^{[2
,4
,5
]}

Niggemann, Jutta ^{[1
]}

机构：

[1] Carl von Ossietzky Univ Oldenburg, Inst Chem & Biol Marine Environm ICBM, Oldenburg, Germany

[2] Helmholtz Ctr Polar & Marine Sci AWI, Alfred Wegener Inst, Bremerhaven, Germany

[3] Carl von Ossietzky Univ Oldenburg, Helmholtz Inst Funct Marine Biodivers HIFMB, Oldenburg, Germany

[4] Max Planck Inst Marine Microbiol MPI, Bremen, Germany

[5] Univ Bremen, MARUM Ctr Marine Environm Sci, Bremen, Germany

[6] Natl Oceanog Ctr, Southampton, Hants, England

来源：

SCIENCE ADVANCES | 2021年 / 7卷 / 25期

基金：

英国自然环境研究理事会;

关键词：

ABIOTIC SULFURIZATION; MOLECULAR COMPOSITION; CARBON BURIAL; SULFUR; OCEAN; BIOGEOCHEMISTRY; VENTILATION; DYNAMICS; NITROGEN; DECLINE;

D O I：

10.1126/sciadv.abf6199

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Today's oceans store as much dissolved organic carbon (DOC) in the water column as there is CO2 in the atmosphere, and as such dissolved organic matter (DOM) is an important component of the global carbon cycle. It was shown that in anoxic marine sediments, reduced sulfur species (e.g., H2S) abiotically react with organic matter, contributing to carbon preservation. It is not known whether such processes also contribute to preserving DOM in ocean waters. Here, we show DOM sulfurization within the sulfidic waters of the Black Sea, by combining elemental, isotopic, and molecular analyses. Dissolved organic sulfur (DOS) is formed largely in the water column and not derived from sediments or allochthonous nonmarine sources. Our findings suggest that during large-scale anoxic events, DOM may accumulate through abiotic reactions with reduced sulfur species, having long-lasting effects on global climate by enhancing organic carbon sequestration.

引用

页数：10

共 65 条

[31] Black Sea dissolved organic matter dynamics: Insights from optical analyses [J].