Stable carbon and oxygen isotope ratios of foraminifera in surface sediments of the South China Sea
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PANGAEA
2005
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| _version_ | 1867171356603318272 |
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| author | Cheng, Xinrong Huang, Baoqi Jian, Zhimin Zhao, Quanhong Tian, Jun Li, Jianru |
| author_facet | Cheng, Xinrong Huang, Baoqi Jian, Zhimin Zhao, Quanhong Tian, Jun Li, Jianru |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The relationship between planktonic and benthic foraminiferal stable-isotope values and oceanographic conditions and factors controlling isotopic variations are discussed on the basis of oxygen and carbon isotopic analyses of 192 modern surface and Last Glacial Maximum (LGM) samples from the South China Sea (SCS). The harmonic variation of benthic delta18O in surface sediments with water depth and temperature implies that the temperature is the main factor influencing benthic delta18O variations. Planktonic delta18O fluctuates with sea surface temperature (SST) and salinity (SSS). The N-S temperature gradient results in planktonic delta18O decreasing from the northeast to the south. Cool, saline waters driven by the winter monsoon are interpreted to have been responsible for the high delta18O values in the northeast SCS. The East Asian monsoons not only bring nutrients into the South China Sea and maintain high nutrient concentration levels at the southwestern and northeastern ends, which cause depleted delta13C both in planktonic (surface) and benthic (bottom) samples but also reduce planktonic/benthic delta18O differences. The distribution of delta18O and delta13C in the surface and LGM samples are strikingly similar, indicating that the impact of SST and SSS has been maintained, and nutrient inputs, mainly from the northeastern and southwestern ends, have been controlled by monsoons since the LGM. Comparisons of the modern and LGM delta18O indicate a difference of about 3.6 °C in bottom-water temperature and a large surface-to-bottom temperature gradient during the LGM as compared to today. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_690658 |
| institution | PANGAEA |
| language | en |
| publishDate | 2005 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Stable carbon and oxygen isotope ratios of foraminifera in surface sediments of the South China Sea Cheng, Xinrong Huang, Baoqi Jian, Zhimin Zhao, Quanhong Tian, Jun Li, Jianru 184-1143; COMPCORE; Composite Core; Giant box corer; GIK17920-1; GIK17921-1; GIK17924-1; GIK17925-2; GIK17926-2; GIK17927-1; GIK17928-2; GIK17929-1; GIK17930-1; GIK17931-1; GIK17932-1; GIK17933-2; GIK17934-1; GIK17935-2; GIK17937-1; GIK17938-1; GIK17939-1; GIK17940-1; GIK17941-1; GIK17942-1; GIK17943-1; GIK17944-1; GIK17945-1; GIK17946-1; GIK17947-2; GIK17948-1; GIK17949-1; GIK17950-1; GIK17951-1; GIK17952-2; GIK17954-1; GIK17955-1; GIK17956-1; GIK17957-1; GIK17958-1; GIK17959-1; GIK17960-1; GIK17961-1; GIK17962-1; GIK17963-2; GIK17964-1; GIK17965-1; GIK18267-1; GIK18268-1; GIK18284-2; GIK18285-1; GIK18286-1; GIK18287-1; GIK18288-1; GIK18289-1; GIK18290-1; GIK18291-1; GIK18292-1; GIK18293-1; GIK18294-1; GKG; Joides Resolution; Leg184; MONITOR MONSUN; MUC; MultiCorer; Ocean Drilling Program; ODP; SO115; SO115_20; SO115_21; SO115_37; SO115_38; SO115_39; SO115_40; SO115_41; SO115_42; SO115_43; SO115_44; SO115_45; SO115_46; SO115_47; SO95; Sonne; South China Sea; SUNDAFLUT; Sunda Shelf The relationship between planktonic and benthic foraminiferal stable-isotope values and oceanographic conditions and factors controlling isotopic variations are discussed on the basis of oxygen and carbon isotopic analyses of 192 modern surface and Last Glacial Maximum (LGM) samples from the South China Sea (SCS). The harmonic variation of benthic delta18O in surface sediments with water depth and temperature implies that the temperature is the main factor influencing benthic delta18O variations. Planktonic delta18O fluctuates with sea surface temperature (SST) and salinity (SSS). The N-S temperature gradient results in planktonic delta18O decreasing from the northeast to the south. Cool, saline waters driven by the winter monsoon are interpreted to have been responsible for the high delta18O values in the northeast SCS. The East Asian monsoons not only bring nutrients into the South China Sea and maintain high nutrient concentration levels at the southwestern and northeastern ends, which cause depleted delta13C both in planktonic (surface) and benthic (bottom) samples but also reduce planktonic/benthic delta18O differences. The distribution of delta18O and delta13C in the surface and LGM samples are strikingly similar, indicating that the impact of SST and SSS has been maintained, and nutrient inputs, mainly from the northeastern and southwestern ends, have been controlled by monsoons since the LGM. Comparisons of the modern and LGM delta18O indicate a difference of about 3.6 °C in bottom-water temperature and a large surface-to-bottom temperature gradient during the LGM as compared to today. |
| title | Stable carbon and oxygen isotope ratios of foraminifera in surface sediments of the South China Sea |
| topic | 184-1143; COMPCORE; Composite Core; Giant box corer; GIK17920-1; GIK17921-1; GIK17924-1; GIK17925-2; GIK17926-2; GIK17927-1; GIK17928-2; GIK17929-1; GIK17930-1; GIK17931-1; GIK17932-1; GIK17933-2; GIK17934-1; GIK17935-2; GIK17937-1; GIK17938-1; GIK17939-1; GIK17940-1; GIK17941-1; GIK17942-1; GIK17943-1; GIK17944-1; GIK17945-1; GIK17946-1; GIK17947-2; GIK17948-1; GIK17949-1; GIK17950-1; GIK17951-1; GIK17952-2; GIK17954-1; GIK17955-1; GIK17956-1; GIK17957-1; GIK17958-1; GIK17959-1; GIK17960-1; GIK17961-1; GIK17962-1; GIK17963-2; GIK17964-1; GIK17965-1; GIK18267-1; GIK18268-1; GIK18284-2; GIK18285-1; GIK18286-1; GIK18287-1; GIK18288-1; GIK18289-1; GIK18290-1; GIK18291-1; GIK18292-1; GIK18293-1; GIK18294-1; GKG; Joides Resolution; Leg184; MONITOR MONSUN; MUC; MultiCorer; Ocean Drilling Program; ODP; SO115; SO115_20; SO115_21; SO115_37; SO115_38; SO115_39; SO115_40; SO115_41; SO115_42; SO115_43; SO115_44; SO115_45; SO115_46; SO115_47; SO95; Sonne; South China Sea; SUNDAFLUT; Sunda Shelf |
| url | https://doi.org/10.1594/PANGAEA.690658 |