Quaternary surface water temperature estimations: Calibration of a diatom transfer function for the Southern Ocean

Zielinski, Ulrich; Gersonde, Rainer; Sieger, Rainer; Fütterer, Dieter K

doi:10.1029/98pa01320

Cited by 86 publications

(52 citation statements)

References 60 publications

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“…Our observations substantially expand the size ranges known for this taxon compared to previous reports (see Table 1 and Figure 6). Because this core originates from the central area of the opal belt it consists mainly of diatoms, which are generally well to moderately preserved and do not show significant effects of dissolution on the preserved diatom valves [8]. Our observations substantially expand the size ranges known for this taxon compared to previous reports (see Table 1 and Figure 6).…”

Section: Resultscontrasting

confidence: 30%

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Large-Scale Permanent Slide Imaging and Image Analysis for Diatom Morphometrics

et al. 2017

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Light microscopy analysis of diatom frustules is widely used in basic and applied research, notably taxonomy, morphometrics, water quality monitoring and paleo-environmental studies. Although there is a need for automation in these applications, various developments in image processing and analysis methodology supporting these tasks have not become widespread in diatom-based analyses. We have addressed this issue by combining our automated diatom image analysis software SHERPA with a commercial slide-scanning microscope. The resulting workflow enables mass-analyses of a broad range of morphometric features from individual frustules mounted on permanent slides. Extensive automation and internal quality control of the results helps to minimize user intervention, but care was taken to allow the user to stay in control of the most critical steps (exact segmentation of valve outlines and selection of objects of interest) using interactive functions for reviewing and revising results. In this contribution, we describe our workflow and give an overview of factors critical for success, ranging from preparation and mounting through slide scanning and autofocus finding to final morphometric data extraction. To demonstrate the usability of our methods we finally provide an example application by analysing Fragilariopsis kerguelensis valves originating from a sediment core, which substantially extends the size range reported in the literature.

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Section: Resultscontrasting

confidence: 30%

“…Its 9.03 m cover ca. 140,000 years, with F. kerguelensis being the dominant species [8]. This diatom is the most prominent endemic diatom species of the Southern Ocean as well as the main opal contributor to the Southern Ocean diatom ooze belt [9].…”

Section: Introductionmentioning

confidence: 99%

Large-Scale Permanent Slide Imaging and Image Analysis for Diatom Morphometrics

et al. 2017

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“…• The austral summer SSTs from the Atlantic sector of the Southern Ocean by Gersonde et al (2003), based on faunal assemblages of foraminifera (Niebler and Gersonde 1998), radiolaria (Abelmann et al 1999), and diatoms (Zielinski et al 1998). …”

Section: Sstmentioning

confidence: 99%

The Atlantic Ocean at the Last Glacial Maximum: 1. Objective Mapping of the GLAMAP Sea-Surface Conditions

Schäfer-Neth

Paul

2003

The South Atlantic in the Late Quaternary

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Recent efforts of the German paleoceanographic community have resulted in a unique data set of reconstructed sea-surface temperature for the Atlantic Ocean during the Last Glacial Maximum, plus estimates for the extents of glacial sea ice. Unlike prior attempts, the contributing research groups based their data on a common definition of the Last Glacial Maximum chronozone and used the same modern reference data for calibrating the different transfer techniques. Furthermore, the number of processed sediment cores was vastly increased. Thus the new data is a significant advance not only with respect to quality, but also to quantity. We integrate these new data and provide monthly data sets of global sea-surface temperature and ice cover, objectively interpolated onto a regular 1°x1° grid, suitable for forcing or validating numerical ocean and atmosphere models. This set is compared to an existing subjective interpolation of the same base data, in part by employing an ocean circulation model. For the latter purpose, we reconstruct sea surface salinity from the new temperature data and the available oxygen isotope measurements.

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“…[4] Transfer functions applied to microfossil assemblages have been successfully used to reconstruct past sea surface temperatures (SST) [CLIMAP Project Members, 1981;Pisias et al, 1997;Zielinski et al, 1998;Abelmann et al, 1999;Cortese and Abelmann, 2002;Niebler et al, 2003]. Radiolarians are particularly promising in this respect for the study area, as they are highly diversified and well preserved in Southern Ocean sediments Cortese and Abelmann, 2002].…”

Section: Introductionmentioning

confidence: 99%

The last five glacial‐interglacial transitions: A high‐resolution 450,000‐year record from the subantarctic Atlantic

2007

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[1] A submillennial resolution, radiolarian-based record of summer sea surface temperature (SST) documents the last five glacial to interglacial transitions at the subtropical front, southern Atlantic Ocean. Rapid fluctuations occur both during glacial and interglacial intervals, and sudden cooling episodes at glacial terminations are recurrent. Surface hydrography and global ice volume proxies from the same core suggest that summer SST increases prior to terminations lead global ice-volume decreases by 4.7 ± 3.7 ka (in the eccentricity band), 6.9 ± 2.5 ka (obliquity), and 2.7 ± 0.9 ka (precession). A comparison between SST and benthic d 13 C suggests a decoupling in the response of northern subantarctic surface, intermediate, and deep water masses to cold events in the North Atlantic. The matching features between our SST record and the one from core MD97-2120 (southwest Pacific) suggests that the super-regional expression of climatic events is substantially affected by a single climatic agent: the Subtropical Front, amplifier and vehicle for the transfer of climatic change. The direct correlation between warmer DT site at Vostok and warmer SST at ODP Site 1089 suggests that warmer oceanic/ atmospheric conditions imply a more southward placed frontal system, weaker gradients, and therefore stronger Agulhas input to the Atlantic Ocean.Citation: Cortese, G., A. Abelmann, and R. Gersonde (2007), The last five glacial-interglacial transitions: A high-resolution 450,000-year record from the subantarctic Atlantic, Paleoceanography, 22, PA4203,

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Quaternary surface water temperature estimations: Calibration of a diatom transfer function for the Southern Ocean

Cited by 86 publications

References 60 publications

Large-Scale Permanent Slide Imaging and Image Analysis for Diatom Morphometrics

Large-Scale Permanent Slide Imaging and Image Analysis for Diatom Morphometrics

The Atlantic Ocean at the Last Glacial Maximum: 1. Objective Mapping of the GLAMAP Sea-Surface Conditions

The last five glacial‐interglacial transitions: A high‐resolution 450,000‐year record from the subantarctic Atlantic

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