Publication Date:
2023-03-03
Description:
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.
Keywords:
Alkenone, per unit mass total organic carbon; Alkenone, unsaturation index UK'37; Alkenone per unit sediment mass; Average chain length; Branched and isoprenoid tetraether index; Calculated from TEX86 (Kim et al., 2010); Calculated from UK37 (Conte et al., 2006); Carbon Preference Index; Center for Marine Environmental Sciences; DEPTH, sediment/rock; Elevation of event; Event label; GeoB10008-4; GeoB10010-1; GeoB10014-1; GeoB10015-1; GeoB10016-2; GeoB10022-3; GeoB10024-3; GeoB10025-3; GeoB10026-2; GeoB10027-3; GeoB10028-4; GeoB10029-3; GeoB10031-3; GeoB10032-1; GeoB10033-5; GeoB10034-3; GeoB10036-3; GeoB10037-2; GeoB10038-3; GeoB10039-3; GeoB10040-3; GeoB10041-3; GeoB10043-2; GeoB10044-3; GeoB10047-1; GeoB10049-5; GeoB10050-1; GeoB10058-1; GeoB10059-1; GeoB10061-5; GeoB10063-5; GeoB10064-5; GeoB10066-6; GeoB10067-5; GeoB10068-1; GeoB10069-4; Glycerol dialkyl glycerol tetraethers; Glycerol dialkyl glycerol tetraethers, per unit mass total organic carbon; Latitude of event; Longitude of event; MARUM; MSN; MUC; MultiCorer; Multiple opening/closing net; n-Alkane, C31/C29 ratio; n-Alkane C24; n-Alkane C25; n-Alkane C26; n-Alkane C27; n-Alkane C28; n-Alkane C29; n-Alkane C30; n-Alkane C31; n-Alkane C32; n-Alkane C33; n-Alkane C34; n-Alkane C35; PABESIA; Sea surface temperature, annual mean; SO184/1; SO184/2; Sonne; Sum n-alkanes C29-C33; Temperature, water, interpolated; Tetraether index of 86 carbon atoms
Type:
Dataset
Format:
text/tab-separated-values, 878 data points
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