Saved in:
| Main Authors: | , |
|---|---|
| Format: | Dataset Open Access |
| Language: | en |
| Published: |
PANGAEA
2010
|
| Subjects: | |
| Online Access: | https://doi.org/10.1594/PANGAEA.831625 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1867169091938156544 |
|---|---|
| author | Govil, Pawan Naidu, Pothuri Divakar |
| author_facet | Govil, Pawan Naidu, Pothuri Divakar |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Variations in sea surface temperature (SST), d18O of sea water (δ18Ow), and salinity were reconstructed for the past 68 ka using a sediment core (AAS9/21) from the eastern Arabian Sea (EAS) in order to understand the changes in evaporation and precipitation associated with the monsoon system. The Mg/Ca-derived SST record varies by ~4°C; it shows that marine isotope stage (MIS) 4 was warmer than MIS 3, that the Last Glacial Maximum was 4°C cooler than the present, and that there was a 2°C increase within the Holocene. MIS 4 records higher d18Ow and salinity values than MIS 2, suggesting variable flow of low-salinity Bay of Bengal flow into the EAS during glacial periods. The transition from MIS 4 to MIS 3 was marked with a conspicuous shift from higher to lower d18Ow values, which reflects a decrease in the evaporation-precipitation budget in the EAS, perhaps due to the strengthening of southwest monsoon. Monsoon reconstructions based on d18Ow reveal that monsoon-driven precipitation was higher during MIS 3 and MIS 1 and was lower during MIS 2 and MIS 4. This is consistent with earlier monsoon reconstructions based on upwelling indices from the western Arabian Sea. However, the amplitude of monsoon fluctuations derived through upwelling indices and d18Ow varies significantly, which may indicate spatial variability of monsoon rainfall. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_831625 |
| institution | PANGAEA |
| language | en |
| publishDate | 2010 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table S1) Stable oxygen isotopic values and Mg/Ca ratios of Globigerinoides ruber w from sediment core AAS9_21 Govil, Pawan Naidu, Pothuri Divakar AAS9_21; AAS9/21; AGE; Arabian Sea; Calculated according to Bemis et al., 1998; Core; CORE; DEPTH, sediment/rock; Globigerinoides ruber white, Magnesium/Calcium ratio, corrected; Globigerinoides ruber white, δ18O; ICP-MS, Thermo Finnigan, Element 2; Mass spectrometer, Finnigan, MAT 252; Sea surface temperature, annual mean Variations in sea surface temperature (SST), d18O of sea water (δ18Ow), and salinity were reconstructed for the past 68 ka using a sediment core (AAS9/21) from the eastern Arabian Sea (EAS) in order to understand the changes in evaporation and precipitation associated with the monsoon system. The Mg/Ca-derived SST record varies by ~4°C; it shows that marine isotope stage (MIS) 4 was warmer than MIS 3, that the Last Glacial Maximum was 4°C cooler than the present, and that there was a 2°C increase within the Holocene. MIS 4 records higher d18Ow and salinity values than MIS 2, suggesting variable flow of low-salinity Bay of Bengal flow into the EAS during glacial periods. The transition from MIS 4 to MIS 3 was marked with a conspicuous shift from higher to lower d18Ow values, which reflects a decrease in the evaporation-precipitation budget in the EAS, perhaps due to the strengthening of southwest monsoon. Monsoon reconstructions based on d18Ow reveal that monsoon-driven precipitation was higher during MIS 3 and MIS 1 and was lower during MIS 2 and MIS 4. This is consistent with earlier monsoon reconstructions based on upwelling indices from the western Arabian Sea. However, the amplitude of monsoon fluctuations derived through upwelling indices and d18Ow varies significantly, which may indicate spatial variability of monsoon rainfall. |
| title | (Table S1) Stable oxygen isotopic values and Mg/Ca ratios of Globigerinoides ruber w from sediment core AAS9_21 |
| topic | AAS9_21; AAS9/21; AGE; Arabian Sea; Calculated according to Bemis et al., 1998; Core; CORE; DEPTH, sediment/rock; Globigerinoides ruber white, Magnesium/Calcium ratio, corrected; Globigerinoides ruber white, δ18O; ICP-MS, Thermo Finnigan, Element 2; Mass spectrometer, Finnigan, MAT 252; Sea surface temperature, annual mean |
| url | https://doi.org/10.1594/PANGAEA.831625 |