Performance of temperature and productivity proxies based on long-chain alkane-1, mid-chain diols at test: a 5-year sediment trap record from the Mauritanian upwelling

Proxies based on long-chain alkane-1, mid-chain diols (diol for short) are obtaining increasing interest to reconstruct past upper ocean temperature and productivity. Here we evaluate performance of the sea surface temperature proxies (long-chain diol index (LDI), diol saturation index (DSI), and di...

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Bibliographic Details
Published in:Biogeosciences 2022-03, Vol.19 (5), p.1587-1610
Main Authors: Versteegh, Gerard J. M, Zonneveld, Karin A. F, Hefter, Jens, Romero, Oscar E, Fischer, Gerhard, Mollenhauer, Gesine
Format: Article
Language:English
Subjects:
Abundance
Airports
Alkanes
Artificial upwelling
Coasts
Comparative analysis
Correlation
Diols
Glycols
Irradiation
Lipids
Metabolites
Mineral nutrients
Nitrates
Nutrient concentrations
Nutrients
Ocean circulation
Ocean temperature
Oceans
Performance evaluation
Phosphates
Plankton
Productivity
Proxies
Proxy
Radiation
Satellites
Saturation
Saturation index
Sea surface
Sea surface temperature
Sediment
Sediment samples
Sediment traps
Sediments
Sediments (Geology)
Subsurface temperatures
Surface temperature
Trade winds
Upper ocean
Upwelling
Water depth
Wind
Wind direction
Wind effects
Wind speed
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Summary:Proxies based on long-chain alkane-1, mid-chain diols (diol for short) are obtaining increasing interest to reconstruct past upper ocean temperature and productivity. Here we evaluate performance of the sea surface temperature proxies (long-chain diol index (LDI), diol saturation index (DSI), and diol chain length index (DCI)), productivity and upwelling intensity proxies (two diol indices DI.sub.R and DI.sub.W and the combined diol index (CDI)), and the nutrient diol index (NDI) as a proxy for phosphate and nitrate levels. This evaluation is based on comparison of the diols in sediment trap samples from the upwelling region off NW Africa collected at 1.28 km water depth with daily satellite-derived sea surface temperatures (SSTs), subsurface temperatures, productivity, the plankton composition from the trap location, monthly phosphate and nitrate concentrations, wind speed, and wind direction from the nearby Nouadhibou airport. The diol-based SST reconstructions are also compared the long-chain-alkenone-based SST reconstructions.
ISSN:1726-4189
1726-4170
1726-4189
DOI:10.5194/bg-19-1587-2022