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Chen, Wenwen; Mohtadi, Mahyar; Schefuß, Enno; Mollenhauer, Gesine (2016): Concentrations and abundance ratios of long-chain alkenones and glycerol dialkyl glycerol tetraethers in sinking particles south of Java. PANGAEA, https://doi.org/10.1594/PANGAEA.858877, Supplement to: Chen, W et al. (2016): Concentrations and abundance ratios of long-chain alkenones and glycerol dialkyl glycerol tetraethers in sinking particles south of Java. Deep Sea Research Part I: Oceanographic Research Papers, 112, 14-24, https://doi.org/10.1016/j.dsr.2016.02.010

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Abstract:
In this study, we obtained concentrations and abundance ratios of long-chain alkenones and glycerol dialkyl glycerol tetraethers (GDGTs) in a one-year time-series of sinking particles collected with a sediment trap moored from December 2001 to November 2002 at 2200 m water depth south of Java in the eastern Indian Ocean. We investigate the seasonality of alkenone and GDGT fluxes as well as the potential habitat depth of the Thaumarchaeota producing the GDGTs entrained in sinking particles. The alkenone flux shows a pronounced seasonality and ranges from 1 µg m-**2 d**-1 to 35 µg m**-2 d**-1. The highest alkenone flux is observed in late September during the Southeast monsoon, coincident with high total organic carbon fluxes as well as high net primary productivity. Flux-weighted mean temperature for the high flux period using the alkenone-based sea-surface temperature (SST) index UK'37 is 26.7°C, which is similar to satellite-derived Southeast (SE) monsoon SST (26.4°C). The GDGT flux displays a weaker seasonality than that of the alkenones. It is elevated during the SE monsoon period compared to the Northwest (NW) monsoon and intermonsoon periods (approximately 2.5 times), which is probably related to seasonal variation of the abundance of Thaumarchaeota, or to enhanced export of GDGTs by aggregation with sinking phytoplankton detritus. Flux-weighted mean temperature inferred from the GDGT-based TEXH86 index is 26.2°C, which is 1.8 °C lower than mean annual (ma) SST but similar to SE monsoon SST. As the time series of TEXH86 temperature estimates, however, does not record a strong seasonal amplitude, we infer that TEXH86 reflects ma upper thermocline temperature at approximately 50 m water depth.
Coverage:
Latitude: -8.291700 * Longitude: 108.033300
Date/Time Start: 2001-12-17T00:00:00 * Date/Time End: 2002-10-30T00:00:00
Minimum DEPTH, water: 2200 m * Maximum DEPTH, water: 2200 m
Event(s):
JAM-2 * Latitude: -8.291700 * Longitude: 108.033300 * Elevation: -2200.0 m * Location: off south Java * Device: Mooring (MOOR)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Sample code/labelSample labelMollenhauer, Gesine
2DEPTH, waterDepth watermMollenhauer, GesineGeocode
3DATE/TIMEDate/TimeMollenhauer, GesineGeocode
4Duration, number of daysDurationdaysMollenhauer, Gesine
5Acyclic glycerol dialkyl glycerol tetraetherGDGT-0µg/gMollenhauer, Gesine
6Monocyclic glycerol dialkyl glycerol tetraetherGDGT-1µg/gMollenhauer, Gesine
7Dicyclic glycerol dialkyl glycerol tetraetherGDGT-2µg/gMollenhauer, Gesine
8Tricyclic glycerol dialkyl glycerol tetraetherGDGT-3µg/gMollenhauer, Gesine
9CrenarchaeolGDGT-5µg/gMollenhauer, Gesine
10Crenarchaeol isomerCren isoµg/gMollenhauer, Gesine
11Tetramethylated branched glycerol dialkyl glycerol tetraether IabrGDGT Iµg/gMollenhauer, Gesine
12Pentamethylated branched glycerol dialkyl glycerol tetraether IIa/a'brGDGT IIµg/gMollenhauer, Gesine
13Hexamethylated branched glycerol dialkyl glycerol tetraether IIIa/a'brGDGT IIIµg/gMollenhauer, Gesine
14Acyclic glycerol dialkyl glycerol tetraether, fractional abundanceGDGT-0Mollenhauer, Gesine
15Monocyclic glycerol dialkyl glycerol tetraether, fractional abundanceGDGT-1Mollenhauer, Gesine
16Dicyclic glycerol dialkyl glycerol tetraether, fractional abundanceGDGT-2Mollenhauer, Gesine
17Tricyclic glycerol dialkyl glycerol tetraether, fractional abundanceGDGT-3Mollenhauer, Gesine
18Crenarchaeol, fractional abundanceGDGT-5Mollenhauer, Gesine
19Crenarchaeol isomer, fractional abundanceGDGT-5 isoMollenhauer, Gesine
20Tetraether index of 86 carbon atomsTEX86Mollenhauer, Gesine
21Branched and isoprenoid tetraether indexBITMollenhauer, Gesine
22Alkenone, C37:3C37:3ng/gMollenhauer, Gesine
23Alkenone, C37:2C37:2ng/gMollenhauer, Gesine
24Alkenone, unsaturation index UK'37UK'37Mollenhauer, Gesine
Size:
415 data points

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