Iron-Phosphorus Feedbacks Drive Multidecadal Oscillations in Baltic Sea Hypoxia

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http://hdl.handle.net/10138/338546

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Jilbert , T , Gustafsson , B G , Veldhuijzen , S , Reed , D C , Helmond , N A G M , Hermans , M & Slomp , C P 2021 , ' Iron-Phosphorus Feedbacks Drive Multidecadal Oscillations in Baltic Sea Hypoxia ' , Geophysical Research Letters , vol. 48 , no. 24 , ARTN e2021GL095908 . https://doi.org/10.1029/2021GL095908

Titel: Iron-Phosphorus Feedbacks Drive Multidecadal Oscillations in Baltic Sea Hypoxia
Författare: Jilbert, Tom; Gustafsson, Bo G.; Veldhuijzen, Simon; Reed, Daniel C.; Helmond, Niels A. G. M.; Hermans, Martijn; Slomp, Caroline P.
Upphovmannens organisation: Environmental Geochemistry
Department of Geosciences and Geography
Helsinki Institute of Sustainability Science (HELSUS)
Marine Ecosystems Research Group
Aquatic Biogeochemistry Research Unit (ABRU)
Tvärminne Zoological Station
Datum: 2021-12-28
Språk: eng
Sidantal: 11
Tillhör serie: Geophysical Research Letters
ISSN: 0094-8276
DOI: https://doi.org/10.1029/2021GL095908
Permanenta länken (URI): http://hdl.handle.net/10138/338546
Abstrakt: Hypoxia has occurred intermittently in the Baltic Sea since the establishment of brackish-water conditions at similar to 8,000 years B.P., principally as recurrent hypoxic events during the Holocene Thermal Maximum (HTM) and the Medieval Climate Anomaly (MCA). Sedimentary phosphorus release has been implicated as a key driver of these events, but previous paleoenvironmental reconstructions have lacked the sampling resolution to investigate feedbacks in past iron-phosphorus cycling on short timescales. Here we employ Laser Ablation (LA)-ICP-MS scanning of sediment cores to generate ultra-high resolution geochemical records of past hypoxic events. We show that in-phase multidecadal oscillations in hypoxia intensity and iron-phosphorus cycling occurred throughout these events. Using a box model, we demonstrate that such oscillations were likely driven by instabilities in the dynamics of iron-phosphorus cycling under preindustrial phosphorus loads, and modulated by external climate forcing. Oscillatory behavior could complicate the recovery from hypoxia during future trajectories of external loading reductions.
Subject: Baltic Sea
biogeochemistry
box modeling
deoxygenation
oscillations
sediments
ORGANIC-MATTER
BIOGEOCHEMICAL CYCLES
CYANOBACTERIA BLOOMS
CLIMATE VARIABILITY
NUTRIENT
OXYGEN
CARBON
MODEL
WATER
SEDIMENTS
1171 Geosciences
1172 Environmental sciences
Referentgranskad: Ja
Licens: cc_by_nc
Användningsbegränsning: openAccess
Parallelpublicerad version: publishedVersion


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