Biomarker distributions in sediment core PS2767-4

Here, we present a first (low-resolution) biomarker sea-ice proxy record from the High Arctic (southern Lomonosov Ridge), going back in time to about 60 ka (MIS 3 to MIS 1). Variable concentrations of the sea-ice diatom specific highly branched isoprenoid (HBI) with 25 carbon atoms ("IP25"...

Full description

Bibliographic Details
Main Authors: Stein, Ruediger, Fahl, Kirsten
Format: Dataset
Language:English
Published: PANGAEA 2012
Subjects:
2,10,14-Trimethyl-6-enyl-7-(3-methylpent-1-enyl)pentadecene
per unit mass total organic carbon
2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane
24-ethylcholest-5-en-3β-ol
24-Methylcholest-5-en-3beta-ol
24-Methylcholesta-5,22E-dien-3beta-ol
AGE
Arctic Ocean
ARK-XI/1
AWI_Paleo
C25 highly branched isoprenoid diene/IP25 ratio
Calculated
Carbon
organic
total
DEPTH
sediment/rock
Element analyser CHN
LECO CNS 2000
Gas chromatography - Mass spectrometry (GC-MS)
KAL
Kasten corer
Paleoenvironmental Reconstructions from Marine Sediments @ AWI
Phytoplankton biomarker Brassicasterol IP25 index
Polarstern
PS2767-4
PS36
PS36/066
Arctic
Lomonosov Ridge
Phytoplankton
Polarforschung
Sea ice
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.803235
https://doi.org/10.1594/PANGAEA.803235
Description
Summary:Here, we present a first (low-resolution) biomarker sea-ice proxy record from the High Arctic (southern Lomonosov Ridge), going back in time to about 60 ka (MIS 3 to MIS 1). Variable concentrations of the sea-ice diatom specific highly branched isoprenoid (HBI) with 25 carbon atoms ("IP25"), in combination with the phytoplankton biomarker brassicasterol, suggest variable seasonal sea-ice coverage and open-water productivity during MIS 3. During most of MIS 2, the spring to summer sea-ice margin significantly extended towards the south, resulting in a drastic decrease in phytoplankton productivity. During the Early Holocene Climate Optimum, brassicasterol reached its maximum, interpreted as signal for elevated phytoplankton productivity due to a significantly reduced sea-ice cover. During the mid-late Holocene, IP25 increased and brassicasterol decreased, indicating extended sea-ice cover and reduced phytoplankton productivity, respectively. The HBI diene/IP25 ratios probably reached maximum values during the Bølling-Allerød warm period and decreased during the Holocene, suggesting a correlation with sea-surface temperature.

Similar Items