Data Description

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Chen, W et al. (2014): Organic-geochemical proxies (UK'37 and TEXH86) records in surface sediments of the tropical Eastern Indian Ocean. doi:10.1594/PANGAEA.823057,
Supplement to: Chen, Wenwen; Mohtadi, Mahyar; Schefuß, Enno; Mollenhauer, Gesine (2014): Organic-geochemical proxies of sea surface temperature in surface sediments of the tropical eastern Indian Ocean. Deep Sea Research Part I: Oceanographic Research Papers, 88, 17-29, doi:10.1016/j.dsr.2014.03.005
In this study we reconstruct sea surface temperatures (SSTs) using two lipid-based biomarker proxies (alkenone unsaturation index UK'37 and TEX86 index based on glycerol dibiphytanyl glycerol tetraethers) in 36 surface sediment samples from the Indonesian continental margin off west Sumatra and south of Java and the Lesser Sunda Islands. Comparison of measured temperatures (World Ocean Atlas 09) to reconstructed temperatures suggests that SST-UK'37 reflects the SE monsoon SST in the upwelling area south of Java and the Lesser Sunda Islands, whereas Temp-TEXH86 estimates are up to 2°C lower than SST-UK'37. This offset is possibly related to either one or a combination of two factors: i) the depth habitats of the source organisms; ii) different seasonal production and/ or seasonality of export associated with phytoplankton blooming triggered by primary productivity. In the non-upwelling area off west Sumatra, the alkenone-based SSTs are cooler than measured temperatures during the entire year, likely due to the reduced sensitivity of the UK'37 proxy beyond 28°C. However, reconstructed temperatures based on TEXH86 are consistent with mean annual SST, implying that the Temp-TEXH86 reflects the mean annual SST in the non-upwelling area of the tropical Eastern Indian Ocean.
Median Latitude: -4.745234 * Median Longitude: 105.518550 * South-bound Latitude: -9.729167 * West-bound Longitude: 96.660333 * North-bound Latitude: 1.678500 * East-bound Longitude: 121.002525
Date/Time Start: 2005-08-06T04:29:00 * Date/Time End: 2005-09-07T11:02:00
Minimum DEPTH, sediment/rock: m * Maximum DEPTH, sediment/rock: m
GeoB10008-4 * * Latitude: -0.954833 * Longitude: 98.259833 * Date/Time: 2005-08-06T04:29:00 * Elevation: -934.0 m * Campaign: SO184/1 (PABESIA) * * Basis: Sonne * * Device: MultiCorer (MUC) * * Comment: 6/6 4/4
GeoB10010-1 * * Latitude: -1.178167 * Longitude: 97.981500 * Date/Time: 2005-08-06T11:14:00 * Elevation: -2937.0 m * Campaign: SO184/1 (PABESIA) * * Basis: Sonne * * Device: MultiCorer (MUC) * * Comment: 6/6 4/4
GeoB10014-1 * * Latitude: 1.678500 * Longitude: 96.981000 * Date/Time: 2005-08-08T01:30:00 * Elevation: -1158.0 m * Campaign: SO184/1 (PABESIA) * * Basis: Sonne * * Device: MultiCorer (MUC) * * Comment: 6/6 4/4
DEPTH, sediment/rock = 0 - 1 cm
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event label *Event
2Latitude of event *Latitude
3Longitude of event *Longitude
4Elevation of event *Elevationm
5DEPTH, sediment/rock *DepthmGeocode
6Alkenone per unit sediment mass *Alkenone/sedµg/gChen, Wenwen *Conc. Alkenone (C37)
7Alkenone per unit mass total organic carbon *Alkenone/TOCµg/gChen, Wenwen *Conc. Alkenone (C37)
8Alkenone, unsaturation index UK'37 *UK'37Chen, Wenwen *
9Sea surface temperature, annual mean *SST (1-12)°CChen, Wenwen *Calculated from UK37 (Conte et al., 2006) *SST-UK'37
10Glycerol dialkyl glycerol tetraethers *GDGTsµg/gChen, Wenwen *Conc. GDGTs
11Glycerol dialkyl glycerol tetraethers per unit mass total organic carbon *GDGTs/TOCµg/gChen, Wenwen *Conc. GDGTs
12Tetraether index of 86 carbon atoms *TEX86Chen, Wenwen *
13Temperature, water, interpolated *Temp interp°CChen, Wenwen *Calculated from TEX86 (Kim et al., 2010) *TEXH86
14Branched and isoprenoid tetraether index *BITChen, Wenwen *
15n-Alkane C24 *C24ng/gChen, Wenwen *
16n-Alkane C25 *C25ng/gChen, Wenwen *
17n-Alkane C26 *C26ng/gChen, Wenwen *
18n-Alkane C27 *C27ng/gChen, Wenwen *
19n-Alkane C28 *C28ng/gChen, Wenwen *
20n-Alkane C29 *C29ng/gChen, Wenwen *
21n-Alkane C30 *C30ng/gChen, Wenwen *
22n-Alkane C31 *C31ng/gChen, Wenwen *
23n-Alkane C32 *C32ng/gChen, Wenwen *
24n-Alkane C33 *C33ng/gChen, Wenwen *
25n-Alkane C34 *C34ng/gChen, Wenwen *
26n-Alkane C35 *C35ng/gChen, Wenwen *
27Carbon Preference Index *CPIChen, Wenwen *
28Average chain length *ACLChen, Wenwen *
29n-Alkane, C31/C29 ratio *C31/C29Chen, Wenwen *
30Sum n-alkanes C29-C33 *C29-C33ng/gChen, Wenwen *
878 data points

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