GDGT-based proxies of sediment core YD0903
Fuente:
PANGAEA
Guardado en:
| Autores principales: | , , , , , , |
|---|---|
| Formato: | Dataset Open Access |
| Lenguaje: | en |
| Publicado: |
PANGAEA
2016
|
| Materias: | |
| Acceso en línea: | |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1867172334924726272 |
|---|---|
| author | Ge, HuangMin Zhang, ChuanLun Versteegh, Gerard J M Chen, LingLing Fan, DaiDu Dong, Liang Liu, JingJing |
| author_facet | Ge, HuangMin Zhang, ChuanLun Versteegh, Gerard J M Chen, LingLing Fan, DaiDu Dong, Liang Liu, JingJing |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | We reconstruct the environmental evolution of the East China Sea in the past 14 kyr based on glycerol dialkyl glycerol tetraethers (GDGTs) in a sediment core from the subaqueous Yangtze River Delta. Two primary phases are recognized. Phase I (13.8-8 cal kyr BP) reflects a predominantly continental influence, showing distinctly higher concentrations of branched GDGTs (averaged 143 ng/g dry sediment weight, dsw) than isoprenoid GDGTs (averaged 36 ng/g dsw), high BIT index (branched vs. isoprenoid tetraethers) values (>0.78) and a fluctuating GDGT-0/crenarchaeol ratio (R0/5, varied from 0.52 to 3.81). Within this interval, temporal increases of terrestrial and marine influence are attributed to Younger Dryas (YD) (ca. 12.9-12.2 cal kyr BP) cold event and melt-water pulse (MWP) -1B (11.5-11.1 cal kyr BP), respectively. The prominent transition from 8 to 7.9 cal kyr BP shows a sharp decrease in BIT index value (<0.4) and increase in crenarchaeol, which marks the beginning of phase II. Afterwards, the proxies remain relatively constant, which indicates that phase II (7.9 cal kyr BP-present) is a shelf sedimentary environment with high stand of sea level. Overall, the BIT index in our record serves as a good marker for terrestrial influence at the site, and likely reflects the flooding history of the region. The TEX86 (TetraEther Index of tetraethers consisting of 86 carbons) proxy is not applicable in phase I because of an excess terrestrial influence; but it seems to be valid for revealing the annual SST in phase II (21.6±0.9°C, n=49). In contrast, the MBT'/CBT (Methylation of Branched Tetraethers and Cyclization of Branched Tetraethers) proxy appears to faithfully record the annual mean air temperature (MAT) (14.3±0.63°C, n=68) and presents an integrated signal over the middle and lower Yangtze River drainage basin. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_864789 |
| institution | PANGAEA |
| language | en |
| publishDate | 2016 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | GDGT-based proxies of sediment core YD0903 Ge, HuangMin Zhang, ChuanLun Versteegh, Gerard J M Chen, LingLing Fan, DaiDu Dong, Liang Liu, JingJing Acyclic glycerol dialkyl glycerol tetraether; AGE; Branched and isoprenoid tetraether index; Branched glycerol dialkyl glycerol tetraether; Crenarchaeol; Crenarchaeol isomer; DEPTH, sediment/rock; Dicyclic glycerol dialkyl glycerol tetraether; East China Sea; Glycerol dialkyl glycerol tetraethers; Isoprenoid glycerol dialkyl glycerol tetraether; Monocyclic glycerol dialkyl glycerol tetraether; pH; Ratio; Sample code/label; Sea surface temperature, annual mean; Tetraether index of 86 carbon atoms; Tricyclic glycerol dialkyl glycerol tetraether; YD0903 We reconstruct the environmental evolution of the East China Sea in the past 14 kyr based on glycerol dialkyl glycerol tetraethers (GDGTs) in a sediment core from the subaqueous Yangtze River Delta. Two primary phases are recognized. Phase I (13.8-8 cal kyr BP) reflects a predominantly continental influence, showing distinctly higher concentrations of branched GDGTs (averaged 143 ng/g dry sediment weight, dsw) than isoprenoid GDGTs (averaged 36 ng/g dsw), high BIT index (branched vs. isoprenoid tetraethers) values (>0.78) and a fluctuating GDGT-0/crenarchaeol ratio (R0/5, varied from 0.52 to 3.81). Within this interval, temporal increases of terrestrial and marine influence are attributed to Younger Dryas (YD) (ca. 12.9-12.2 cal kyr BP) cold event and melt-water pulse (MWP) -1B (11.5-11.1 cal kyr BP), respectively. The prominent transition from 8 to 7.9 cal kyr BP shows a sharp decrease in BIT index value (<0.4) and increase in crenarchaeol, which marks the beginning of phase II. Afterwards, the proxies remain relatively constant, which indicates that phase II (7.9 cal kyr BP-present) is a shelf sedimentary environment with high stand of sea level. Overall, the BIT index in our record serves as a good marker for terrestrial influence at the site, and likely reflects the flooding history of the region. The TEX86 (TetraEther Index of tetraethers consisting of 86 carbons) proxy is not applicable in phase I because of an excess terrestrial influence; but it seems to be valid for revealing the annual SST in phase II (21.6±0.9°C, n=49). In contrast, the MBT'/CBT (Methylation of Branched Tetraethers and Cyclization of Branched Tetraethers) proxy appears to faithfully record the annual mean air temperature (MAT) (14.3±0.63°C, n=68) and presents an integrated signal over the middle and lower Yangtze River drainage basin. |
| title | GDGT-based proxies of sediment core YD0903 |
| topic | Acyclic glycerol dialkyl glycerol tetraether; AGE; Branched and isoprenoid tetraether index; Branched glycerol dialkyl glycerol tetraether; Crenarchaeol; Crenarchaeol isomer; DEPTH, sediment/rock; Dicyclic glycerol dialkyl glycerol tetraether; East China Sea; Glycerol dialkyl glycerol tetraethers; Isoprenoid glycerol dialkyl glycerol tetraether; Monocyclic glycerol dialkyl glycerol tetraether; pH; Ratio; Sample code/label; Sea surface temperature, annual mean; Tetraether index of 86 carbon atoms; Tricyclic glycerol dialkyl glycerol tetraether; YD0903 |
| url | https://doi.org/10.1594/PANGAEA.864789 |