Concentrations and abundance ratios of long-chain alkenones and glycerol dialkyl glycerol tetraethers in sinking particles south of Java
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PANGAEA
2016
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| _version_ | 1867171839448449024 |
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| author | Chen, Wenwen Mohtadi, Mahyar Schefuß, Enno Mollenhauer, Gesine |
| author_facet | Chen, Wenwen Mohtadi, Mahyar Schefuß, Enno Mollenhauer, Gesine |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_858877 |
| institution | PANGAEA |
| language | en |
| publishDate | 2016 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Concentrations and abundance ratios of long-chain alkenones and glycerol dialkyl glycerol tetraethers in sinking particles south of Java Chen, Wenwen Mohtadi, Mahyar Schefuß, Enno Mollenhauer, Gesine Acyclic glycerol dialkyl glycerol tetraether; Acyclic glycerol dialkyl glycerol tetraether, fractional abundance; Alkenone, C37:2; Alkenone, C37:3; Alkenone, unsaturation index UK'37; Branched and isoprenoid tetraether index; Center for Marine Environmental Sciences; Crenarchaeol; Crenarchaeol, fractional abundance; Crenarchaeol isomer; Crenarchaeol isomer, fractional abundance; DATE/TIME; DEPTH, water; Dicyclic glycerol dialkyl glycerol tetraether; Dicyclic glycerol dialkyl glycerol tetraether, fractional abundance; Duration, number of days; Hexamethylated branched glycerol dialkyl glycerol tetraether IIIa/a'; JAM-2; MARUM; Monocyclic glycerol dialkyl glycerol tetraether; Monocyclic glycerol dialkyl glycerol tetraether, fractional abundance; MOOR; Mooring; off south Java; Pentamethylated branched glycerol dialkyl glycerol tetraether IIa/a'; Sample code/label; Tetraether index of 86 carbon atoms; Tetramethylated branched glycerol dialkyl glycerol tetraether Ia; Tricyclic glycerol dialkyl glycerol tetraether; Tricyclic glycerol dialkyl glycerol tetraether, fractional abundance 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. |
| title | Concentrations and abundance ratios of long-chain alkenones and glycerol dialkyl glycerol tetraethers in sinking particles south of Java |
| topic | Acyclic glycerol dialkyl glycerol tetraether; Acyclic glycerol dialkyl glycerol tetraether, fractional abundance; Alkenone, C37:2; Alkenone, C37:3; Alkenone, unsaturation index UK'37; Branched and isoprenoid tetraether index; Center for Marine Environmental Sciences; Crenarchaeol; Crenarchaeol, fractional abundance; Crenarchaeol isomer; Crenarchaeol isomer, fractional abundance; DATE/TIME; DEPTH, water; Dicyclic glycerol dialkyl glycerol tetraether; Dicyclic glycerol dialkyl glycerol tetraether, fractional abundance; Duration, number of days; Hexamethylated branched glycerol dialkyl glycerol tetraether IIIa/a'; JAM-2; MARUM; Monocyclic glycerol dialkyl glycerol tetraether; Monocyclic glycerol dialkyl glycerol tetraether, fractional abundance; MOOR; Mooring; off south Java; Pentamethylated branched glycerol dialkyl glycerol tetraether IIa/a'; Sample code/label; Tetraether index of 86 carbon atoms; Tetramethylated branched glycerol dialkyl glycerol tetraether Ia; Tricyclic glycerol dialkyl glycerol tetraether; Tricyclic glycerol dialkyl glycerol tetraether, fractional abundance |
| url | https://doi.org/10.1594/PANGAEA.858877 |