Data Description

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Esper, O; Gersonde, R (2008): Diatoms abundance in sediment core PS58/271-1. doi:10.1594/PANGAEA.693745,
Supplement to: Esper, Oliver; Gersonde, Rainer (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
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/rock *DepthmGeocode
2Actinocyclus curvatulus *A. curvatulus%Esper, Oliver *Counting, diatoms *
3Actinocyclus actinochilus *A. actinochilus%Esper, Oliver *Counting, diatoms *
4Asteromphalus hookeri *A. hookeri%Esper, Oliver *Counting, diatoms *
5Asteromphalus hyalinus *A. hyalinus%Esper, Oliver *Counting, diatoms *
6Asteromphalus parvulus *A. parvulus%Esper, Oliver *Counting, diatoms *
7Azpeitia tabularis var. egregius *A. tabularis var. egregius%Esper, Oliver *Counting, diatoms *
8Azpeitia tabularis var. tabularis *A. tabularis var. tabularis%Esper, Oliver *Counting, diatoms *
9Chaetoceros spp. *Chaetoceros spp.%Esper, Oliver *Counting, diatoms *
10Eucampia antarctica *E. antarctica%Esper, Oliver *Counting, diatoms *
11Fragilariopsis doliolus *F. doliolus%Esper, Oliver *Counting, diatoms *
12Fragilariopsis kerguelensis *F. kerguelensis%Esper, Oliver *Counting, diatoms *
13Fragilariopsis obliquecostata *F. obliquecostata%Esper, Oliver *Counting, diatoms *
14Fragilariopsis sublinearis *F. sublinearis%Esper, Oliver *Counting, diatoms *
15Fragilariopsis ritscheri *F. ritscheri%Esper, Oliver *Counting, diatoms *
16Fragilariopsis curta *F. curta%Esper, Oliver *Counting, diatoms *
17Fragilariopsis rhombica *F. rhombica%Esper, Oliver *Counting, diatoms *
18Fragilariopsis separanda *F. separanda%Esper, Oliver *Counting, diatoms *
19Fragilariopsis cylindrus *F. cylindrus%Esper, Oliver *Counting, diatoms *
20Hemidiscus karstenii *H. karstenii%Esper, Oliver *Counting, diatoms *
21Navicula directa *N. directa%Esper, Oliver *Counting, diatoms *
22Nitzschia sicula var. rostrata *N. sicula var. rostrata%Esper, Oliver *Counting, diatoms *
23Nitzschia sicula var. bicuneata *N. sicula var. bicuneata%Esper, Oliver *Counting, diatoms *
24Pseudo-nitzschia heimii *P-n heimii%Esper, Oliver *Counting, diatoms *
25Pseudo-nitzschia lineola-turgiduloides group *P-n lineola-turgiduloides group%Esper, Oliver *Counting, diatoms *
26Rhizosolenia antennata forma semispina *R. antennata f semispina%Esper, Oliver *Counting, diatoms *
27Rhizosolenia sp. *Rhizosolenia sp.%Esper, Oliver *Counting, diatoms *sp. A
28Rhizosolenia antennata forma antennata *R. antennata f antennata%Esper, Oliver *Counting, diatoms *
29Stellarima stellaris *S. stellaris%Esper, Oliver *Counting, diatoms *
30Stellarima microtrias *S. microtrias%Esper, Oliver *Counting, diatoms *
31Thalassionema nitzschioides forma 1 *T. nitzschioides f 1%Esper, Oliver *Counting, diatoms *
32Thalassionema nitzschioides var. capitulata *T. nitzschioides var. capitulata%Esper, Oliver *Counting, diatoms *
33Thalassionema nitzschioides var. lanceolata *T. nitzschioides var. lanceolata%Esper, Oliver *Counting, diatoms *
34Thalassiosira antarctica *T. antarctica%Esper, Oliver *Counting, diatoms *
35Thalassiosira gracilis var. expecta *T. gracilis var. expecta%Esper, Oliver *Counting, diatoms *
36Thalassiosira gracilis var. gracilis *T. gracilis var. gracilis%Esper, Oliver *Counting, diatoms *
37Thalassiosira gravida *T. gravida%Esper, Oliver *Counting, diatoms *
38Thalassiosira lentiginosa *T. lentiginosa%Esper, Oliver *Counting, diatoms *
39Thalassiosira lineata *T. lineata%Esper, Oliver *Counting, diatoms *
40Thalassiosira oestrupii *T. oestrupii%Esper, Oliver *Counting, diatoms *
41Thalassiosira oliverana *T. oliverana%Esper, Oliver *Counting, diatoms *
42Thalassiosira trifulta *T. trifulta%Esper, Oliver *Counting, diatoms *
43Thalassiosira tumida *T. tumida%Esper, Oliver *Counting, diatoms *
44Porosira pseudodenticulata *P. pseudodenticulata%Esper, Oliver *Counting, diatoms *
45Pleurosigma directum *P. directum%Esper, Oliver *Counting, diatoms *
46Rouxia leventerae *R. leventerae%Esper, Oliver *Counting, diatoms *
47Thalassiothrix antarctica *T. antarctica%Esper, Oliver *Counting, diatoms *
48Trichotoxon reinboldii *T. reinboldii%Esper, Oliver *Counting, diatoms *
49Diatoms indeterminata *Diatoms indet%Esper, Oliver *Counting, diatoms *
50Diatoms *Diatoms#Esper, Oliver *Counting, diatoms *
11956 data points

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