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Romero, Oscar E; Swann, George E A; Hodell, David A; Helmke, Peer; Rey, Daniel; Rubio, Belen (2011): Diatom isotope data (δ¹⁸Odiatom and d30Sidiatom) from IODP Site 303-U1304 (North Atlantic) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.856094, Supplement to: Romero, OE et al. (2011): A highly productive Subarctic Atlantic during the Last Interglacial and the role of diatoms. Geology, 39(11), 1015-1018, https://doi.org/10.1130/G32454.1

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Abstract:
The Last Interglacial (LIG), corresponding to Marine Isotope Stage (MIS) 5e, provides a reference of interglacial climate variability in the absence of anthropogenic forcing. Using an expanded section of the LIG gained at Integrated Ocean Drilling Program Site U1304 in the Subarctic Atlantic, we demonstrate that the early MIS 5e was marked by oceanographic conditions conducive for high diatom production and accumulation. The appearance of diatom-dominated laminated oozes ~3 k.y. after the beginning of MIS 5e at ca. 125 ka coincides with a shift to higher d30Sidiat values together with the dominance of Thalassiothrix longissima, indicative of increased nutrient availability and silicic acid utilization in surface waters. Though the Subarctic Front provided the physical conditions for high diatom production and deposition, these processes alone are insufficient to explain the high rates of siliceous productivity and the formation of diatomaceous sediments. Instead, the additional presence of an increased nutrient pool provided by Subantarctic Mode Water played the decisive role in initiating and sustaining diatom production. The high diatom productivity and the occurrence of diatomaceous sediments in the late Quaternary challenge the current hypothesis of a silica-depleted North Atlantic during the LIG.
Project(s):
Integrated Ocean Drilling Program / International Ocean Discovery Program (IODP)
Coverage:
Median Latitude: 53.000944 * Median Longitude: -33.529575 * South-bound Latitude: 53.000943 * West-bound Longitude: -33.529683 * North-bound Latitude: 53.000945 * East-bound Longitude: -33.529467
Minimum Elevation: -3069.1 m * Maximum Elevation: -3065.4 m
Event(s):
303-U1304A  * Latitude: 53.000945 * Longitude: -33.529683 * Elevation: -3069.1 m * Recovery: 251.37 m * Campaign: Exp303 (North Atlantic Climate 1) * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 26 cores; 239 m cored; 105.2 % recovered; 0 m drilled; 239 m penetrated
303-U1304B  * Latitude: 53.000943 * Longitude: -33.529467 * Elevation: -3065.4 m * Recovery: 252.15 m * Campaign: Exp303 (North Atlantic Climate 1) * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 26 cores; 242.4 m cored; 104 % recovered; 0 m drilled; 242.4 m penetrated
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1 Event labelEventRomero, Oscar E
2 Sample code/labelSample labelRomero, Oscar EDSDP/ODP/IODP sample designation
3 Diatoms, δ18ODiatoms δ18O‰ SMOWRomero, Oscar E
4 Diatoms, δ30SiDiatoms δ30Si‰ NBSRomero, Oscar Evs. NBS28
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
151 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 
Event		2 
Sample label		3 
Diatoms δ18O [‰ SMOW]		4 
Diatoms δ30Si [‰ NBS]
303-U1304B 303-1304B-2H-2,32-3337.5492
303-U1304B303-1304B-2H-2,52-5337.1900
303-U1304B303-1304B-2H-2,72-7335.1209
303-U1304B303-1304B-2H-2,92-9337.62531.8950
303-U1304B303-1304B-2H-2,112-11334.5789
303-U1304B303-1304B-2H-2,132-13334.5276
303-U1304B303-1304B-2H-3,12-1334.6917
303-U1304B303-1304B-2H-3,32-3334.98332.0315
303-U1304B303-1304B-2H-3,52-5338.0303
303-U1304B303-1304B-2H-3,142-14332.6766
303-U1304B303-1304B-2H-4,12-1334.9621
303-U1304B303-1304B-2H-4,52-5335.66091.8790
303-U1304B303-1304B-2H-4,72-7334.6539
303-U1304B303-1304B-2H-4,112-11335.5752
303-U1304B303-1304B-2H-4,132-13333.1876
303-U1304B303-1304B-2H-4,142-14333.42601.9730
303-U1304B303-1304B-2H-5,32-3334.0739
303-U1304B303-1304B-2H-5,72-7335.8527
303-U1304B303-1304B-2H-5,92-9336.62951.8700
303-U1304A 303-1304A-2H-2,12-1337.6338
303-U1304A303-1304A-2H-2,32-3337.0634
303-U1304A303-1304A-2H-2,52-5338.23722.0440
303-U1304A303-1304A-2H-2,72-7339.5509
303-U1304A303-1304A-2H-2,92-9339.40751.8950
303-U1304A303-1304A-2H-2,112-11338.6681
303-U1304A303-1304A-2H-2,132-13338.0461
303-U1304A303-1304A-2H-2,142-14338.7652
303-U1304A303-1304A-2H-3,12-1338.67332.0370
303-U1304A303-1304A-2H-3,32-3340.78731.8770
303-U1304A303-1304A-2H-3,52-5340.4198
303-U1304A303-1304A-2H-3,72-7341.3244
303-U1304A303-1304A-2H-3,92-9341.3521
303-U1304A303-1304A-2H-3,112-11341.73761.9310
303-U1304A303-1304A-2H-3,132-13340.5875
303-U1304A303-1304A-2H-3,142-14340.1644
303-U1304A303-1304A-2H-4,12-1340.93082.2150
303-U1304A303-1304A-2H-4,32-3340.9725
303-U1304A303-1304A-2H-4,52-5340.31131.8910
303-U1304A303-1304A-2H-4,72-7340.6420
303-U1304A303-1304A-2H-4,92-9341.28741.9790
303-U1304A303-1304A-2H-4,112-11340.4413
303-U1304A303-1304A-2H-4,132-13340.12341.9410
303-U1304A303-1304A-2H-4,142-14341.58092.0050
303-U1304A303-1304A-2H-5,12-1336.1699
303-U1304A303-1304A-2H-5,32-3338.06591.6680
303-U1304A303-1304A-2H-5,72-7337.2744
303-U1304A303-1304A-2H-5,92-9337.3631
303-U1304A303-1304A-2H-5,112-11337.7715
303-U1304A303-1304A-2H-6,12-1337.22831.8335
303-U1304A303-1304A-2H-6,32-3340.1758
303-U1304A303-1304A-2H-6,52-5340.61681.5350
303-U1304A303-1304A-2H-6,92-9339.6880
303-U1304B303-1304B-3H-3,132-13335.1297
303-U1304B303-1304B-3H-4,52-5334.66312.2350
303-U1304B303-1304B-3H-4,72-7336.15622.1440
303-U1304B303-1304B-3H-4,92-9333.05852.2540
303-U1304B303-1304B-3H-4,112-11336.7753
303-U1304B303-1304B-3H-4,132-13335.5195
303-U1304B303-1304B-3H-5,52-5334.69071.7720
303-U1304B303-1304B-3H-5,112-11336.97581.9010
303-U1304B303-1304B-3H-5,132-13336.06231.9270
303-U1304B303-1304B-3H-6,12-1341.73241.7680
303-U1304B303-1304B-3H-6,52-5337.9563