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Romero, Oscar E; Armand, Leanne K; Crosta, Xavier; Pichon, Jean-Jacques (2005): Relative abundance of diatom species in surface samples from the Southern Ocean, Tropical/Subtropical species. PANGAEA,, Supplement to: Romero, OE et al. (2005): The biogeography of major diatom taxa in Southern Ocean sediments: 3. Subantarctic species. Palaeogeography, Palaeoclimatology, Palaeoecology, 223(1-2), 49-65,

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This paper gives a modern circumscription of Tropical/Subtropical diatoms regarding their relationship with sea-surface temperatures (SST) and sea ice cover. Diatoms from 228 core-top sediment samples collected from the Southern Ocean were studied to determine the geographic distribution of eight major diatom species/taxa preserved in surface sediments generally located north of the Subantarctic Front. The comparison of the relative contribution of diatom species with modern February SST and sea-ice cover reveals species-specific sedimentary distributions regulated both by water temperatures and sea ice conditions. Although selective preservation might have played some role, their presence in surface and downcore sediments from the Southern Ocean are reliable indicators of high SST and poleward transport of waters from the Tropical/Subtropical Atlantic. Our work supports the use of diatom remains to reconstruct past variations of these environmental parameters via qualitative and transfer function approaches.
Median Latitude: -38.664575 * Median Longitude: -22.036029 * South-bound Latitude: -44.516800 * West-bound Longitude: -24.248500 * North-bound Latitude: -31.950000 * East-bound Longitude: -17.340000
Date/Time Start: 2000-02-17T05:54:00 * Date/Time End: 2000-03-04T02:21:00
Minimum DEPTH, sediment/rock: m * Maximum DEPTH, sediment/rock: m
GeoB6402-9 * Latitude: -39.742700 * Longitude: -22.756500 * Date/Time: 2000-02-17T05:54:00 * Elevation: -3878.0 m * Recovery: 0.43 m * Location: Central South Atlantic * Campaign: M46/4 * Basis: Meteor (1986) * Method/Device: Giant box corer (GKG) * Comment: 3 x bottom contact
GeoB6403-4 * Latitude: -40.013300 * Longitude: -23.365200 * Date/Time: 2000-02-17T20:49:00 * Elevation: -4226.0 m * Recovery: 0.14 m * Location: Central South Atlantic * Campaign: M46/4 * Basis: Meteor (1986) * Method/Device: MultiCorer (MUC) * Comment: 4 large, 4 small tubes filled
GeoB6404-3 * Latitude: -41.505800 * Longitude: -23.464800 * Date/Time: 2000-02-18T10:17:00 * Elevation: -4223.0 m * Recovery: 0.11 m * Location: Central South Atlantic * Campaign: M46/4 * Basis: Meteor (1986) * Method/Device: MultiCorer (MUC) * Comment: 4 large, 4 small tubes filled, CTD at 50 m
Depth=Surface sediment 0-1 cm
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEvent
2Latitude of eventLatitude
3Longitude of eventLongitude
4Elevation of eventElevationm
5DEPTH, sediment/rockDepthmGeocode
6Alveus marinusA. marinus%Romero, Oscar ECounting, diatoms
7Azpeitia tabularisA. tabularis%Romero, Oscar ECounting, diatoms
8Fragilariopsis doliolusF. doliolus%Romero, Oscar ECounting, diatoms
9Hemidiscus cuneiformisH. cuneiformis%Romero, Oscar ECounting, diatoms
10Roperia tessellataR. tessellata%Romero, Oscar ECounting, diatoms
11Thalassionema nitzschioides var. parvaT. nitzschioides var. parva%Romero, Oscar ECounting, diatoms
12Thalassiosira oestrupii var. oestrupiiT. oestrupii var. oestrupii%Romero, Oscar ECounting, diatoms
13Thalassiosira symmetricaT. symmetrica%Romero, Oscar ECounting, diatoms
192 data points

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