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Esper, Oliver; Gersonde, Rainer (2008): Diatoms abundance in sediment core PS58/271-1. doi:10.1594/PANGAEA.693745,
Supplement to: Esper, O; Gersonde, R (2014): Quaternary surface water temperature estimations: New diatom transfer functions for the Southern Ocean. Palaeogeography, Palaeoclimatology, Palaeoecology, 414, 1-19, doi:10.1016/j.palaeo.2014.08.008

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Here we present an improvement of paleotemperature reconstructions for the Southern Ocean by combining new diatom data from the Pacific sector with published Atlantic and Indian sector reference data. The statistical analysis of 336 surface sediment samples recovered from a wide area of Southern Ocean environments defines a supra-regional reference data set for quantitative summer sea surface temperature (SSST) estimations. In situ temperature measurements covering the time span from approx. 1900 to 1991 were used as reference instead of more recent time series of satellite-derived data, possibly biased by ocean warming.
Different transfer function (TF) models for the Imbrie and Kipp Method (IKM), the Modern Analog Technique (MAT), Weighted Averaging (WA), and Weighted Averaging Partial Least Squares (WAPLS) were tested. Best performance for IKM was obtained using the D336 set with 29 diatom taxa and three factors, resulting in root mean square error of prediction (RMSEP) of 0.833 °C for SSST. MAT estimates were best with six analogs resulting in lowest RMSEP of 0.812 °C. WAPLS applied to D336 resulted in a RMSEP of 0.782 °C. WA performed less well, expressed by a RMSEP of 0.974 °C. Furthermore, two subsets for the Atlantic (D151) and the Pacific sectors (D107) were applied with IKM to test for advantages of localized TFs. IKM-D151 and IKM-D107 performed comparably good as IKM-D336, with RMSEP of 0.71 °C and 0.68 °C, respectively.
Application of the augmented reference data sets on two Pleistocene sediment records from the Atlantic (PS1768-8) and Pacific (PS58/271-1) sectors led to best performance of IKM with D336, expressed by high overall communalities (> 0.75) and fewer (PS1768-8) to no (PS58/271-1) no-analogs, compared to the regional data sets, proving IKM-D336 to deal better with higher assemblage variability. SSST estimates for both cores exhibit similar glacial/interglacial patterns for all four applied D336-based TF methods, with best concordance between IKM and WAPLS.
Latitude: -61.243000 * Longitude: -116.047000
Date/Time Start: 2001-03-20T03:43:00 * Date/Time End: 2001-03-20T05:25:00
Minimum DEPTH, sediment/rock: 0.06 m * Maximum DEPTH, sediment/rock: 24.40 m
PS58/271-1 * Latitude: -61.243000 * Longitude: -116.047000 * Date/Time Start: 2001-03-20T03:43:00 * Date/Time End: 2001-03-20T05:25:00 * Elevation: -5214.0 m * Recovery: 24.42 m * Location: Southeast Pacific * Campaign: ANT-XVIII/5a (PS58) * Basis: Polarstern * Device: Piston corer (BGR type) (KL) * Comment: 25 core sections: 0-0.46, 0.46-1.47, 1.47-2.47, 2.47-3.47, 3.47-4.47, 4.47-5.47, 5.47-6.47, 6.47-7.47, 7.47-8.47, 8.47-9.47, 9.47-10.46, 10.46-11.46, 11.46-12.46, 12.46-13.46, 13.46-14.46, 14.46-15.44, 15.44-16.44, 16.44-17.44, 17.44-18.44, 18.44-19.44, 19.44-20.42, 20.42-21.42, 21.42-22.42, 22.42-23.42, 23.42-24.42 m
#NameShort NameUnitPrincipal InvestigatorMethodComment
1DEPTH, sediment/rockDepthmGeocode
2Actinocyclus curvatulusA. curvatulus%Esper, OliverCounting, diatoms
3Actinocyclus actinochilusA. actinochilus%Esper, OliverCounting, diatoms
4Asteromphalus hookeriA. hookeri%Esper, OliverCounting, diatoms
5Asteromphalus hyalinusA. hyalinus%Esper, OliverCounting, diatoms
6Asteromphalus parvulusA. parvulus%Esper, OliverCounting, diatoms
7Azpeitia tabularis var. egregiusA. tabularis var. egregius%Esper, OliverCounting, diatoms
8Azpeitia tabularis var. tabularisA. tabularis var. tabularis%Esper, OliverCounting, diatoms
9Chaetoceros spp.Chaetoceros spp.%Esper, OliverCounting, diatoms
10Eucampia antarcticaE. antarctica%Esper, OliverCounting, diatoms
11Fragilariopsis doliolusF. doliolus%Esper, OliverCounting, diatoms
12Fragilariopsis kerguelensisF. kerguelensis%Esper, OliverCounting, diatoms
13Fragilariopsis obliquecostataF. obliquecostata%Esper, OliverCounting, diatoms
14Fragilariopsis sublinearisF. sublinearis%Esper, OliverCounting, diatoms
15Fragilariopsis ritscheriF. ritscheri%Esper, OliverCounting, diatoms
16Fragilariopsis curtaF. curta%Esper, OliverCounting, diatoms
17Fragilariopsis rhombicaF. rhombica%Esper, OliverCounting, diatoms
18Fragilariopsis separandaF. separanda%Esper, OliverCounting, diatoms
19Fragilariopsis cylindrusF. cylindrus%Esper, OliverCounting, diatoms
20Hemidiscus karsteniiH. karstenii%Esper, OliverCounting, diatoms
21Navicula directaN. directa%Esper, OliverCounting, diatoms
22Nitzschia sicula var. rostrataN. sicula var. rostrata%Esper, OliverCounting, diatoms
23Nitzschia sicula var. bicuneataN. sicula var. bicuneata%Esper, OliverCounting, diatoms
24Pseudo-nitzschia heimiiP-n heimii%Esper, OliverCounting, diatoms
25Pseudo-nitzschia lineola-turgiduloides groupP-n lineola-turgiduloides group%Esper, OliverCounting, diatoms
26Rhizosolenia antennata forma semispinaR. antennata f semispina%Esper, OliverCounting, diatoms
27Rhizosolenia sp.Rhizosolenia sp.%Esper, OliverCounting, diatomssp. A
28Rhizosolenia antennata forma antennataR. antennata f antennata%Esper, OliverCounting, diatoms
29Stellarima stellarisS. stellaris%Esper, OliverCounting, diatoms
30Stellarima microtriasS. microtrias%Esper, OliverCounting, diatoms
31Thalassionema nitzschioides forma 1T. nitzschioides f 1%Esper, OliverCounting, diatoms
32Thalassionema nitzschioides var. capitulataT. nitzschioides var. capitulata%Esper, OliverCounting, diatoms
33Thalassionema nitzschioides var. lanceolataT. nitzschioides var. lanceolata%Esper, OliverCounting, diatoms
34Thalassiosira antarcticaT. antarctica%Esper, OliverCounting, diatoms
35Thalassiosira gracilis var. expectaT. gracilis var. expecta%Esper, OliverCounting, diatoms
36Thalassiosira gracilis var. gracilisT. gracilis var. gracilis%Esper, OliverCounting, diatoms
37Thalassiosira gravidaT. gravida%Esper, OliverCounting, diatoms
38Thalassiosira lentiginosaT. lentiginosa%Esper, OliverCounting, diatoms
39Thalassiosira lineataT. lineata%Esper, OliverCounting, diatoms
40Thalassiosira oestrupiiT. oestrupii%Esper, OliverCounting, diatoms
41Thalassiosira oliveranaT. oliverana%Esper, OliverCounting, diatoms
42Thalassiosira trifultaT. trifulta%Esper, OliverCounting, diatoms
43Thalassiosira tumidaT. tumida%Esper, OliverCounting, diatoms
44Porosira pseudodenticulataP. pseudodenticulata%Esper, OliverCounting, diatoms
45Pleurosigma directumP. directum%Esper, OliverCounting, diatoms
46Rouxia leventeraeR. leventerae%Esper, OliverCounting, diatoms
47Thalassiothrix antarcticaT. antarctica%Esper, OliverCounting, diatoms
48Trichotoxon reinboldiiT. reinboldii%Esper, OliverCounting, diatoms
49Diatoms indeterminataDiatoms indet%Esper, OliverCounting, diatoms
50DiatomsDiatoms#Esper, OliverCounting, diatoms
11956 data points

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