Benthic and planktic foraminiferal stable isotope record and coccolith abundance spanning the last 500,000 years of ODP Hole 121-758C


Autoria(s): Bolton, Clara T; Chang, Liao; Clemens, Steven C; Kodama, Kazuto; Ikehara, Minoru; Medina-Elizalde, Martín; Paterson, Greig A; Roberts, Andrew P; Rohling, Eelco J; Yamamoto, Yuhji; Zhao, Xiang
Cobertura

LATITUDE: 5.384000 * LONGITUDE: 90.361100 * DATE/TIME START: 1988-06-15T15:58:00 * DATE/TIME END: 1988-06-15T23:50:00

Data(s)

11/09/2013

Resumo

The Indian Summer Monsoon (ISM) is an inter-hemispheric and highly variable ocean-atmosphere-land interaction that directly affects the densely populated Indian subcontinent. Here, we present new records of palaeoceanographic variability that span the last 500,000 years from the eastern equatorial Indian Ocean, a relatively under-sampled area of ISM influence. We have generated carbon and oxygen stable isotope records from three foraminiferal species from Ocean Drilling Program Site 758 (5°N, 90°E) to investigate the oceanographic history of this region. We interpret our resultant Dd18O (surface-thermocline) record of upper water-column stratification in the context of past ISM variability, and compare orbital phase relationships in our Site 758 data to other climate and monsoon proxies in the region. Results suggest that upper water-column stratification at Site 758, which is dominated by variance at precession and half-precession frequencies (23, 19 and 11 ka), is forced by both local (5°N) insolation and ISM winds. In the precession (23 ka) band, stratification minima at Site 758 lag northern hemisphere summer insolation maxima (precession minima) by 9 ka, which is consistent with Arabian Sea ISM phase estimates and suggests a common wind forcing in both regions. This phase implicates a strong sensitivity to both ice volume and southern hemisphere insolation forcing via latent heat export from the southern subtropical Indian Ocean. Additionally, we find evidence of possible overprinting of millennial-scale events during glacial terminations in our stratification record, which suggests an influence of remote abrupt climate events on ISM dynamics.

Formato

application/zip, 6 datasets

Identificador

https://doi.pangaea.de/10.1594/PANGAEA.819219

doi:10.1594/PANGAEA.819219

Idioma(s)

en

Publicador

PANGAEA

Direitos

CC-BY: Creative Commons Attribution 3.0 Unported

Access constraints: unrestricted

Fonte

Supplement to: Bolton, Clara T; Chang, Liao; Clemens, Steven C; Kodama, Kazuto; Ikehara, Minoru; Medina-Elizalde, Martín; Paterson, Greig A; Roberts, Andrew P; Rohling, Eelco J; Yamamoto, Yuhji; Zhao, Xiang (2013): A 500,000 year record of Indian summer monsoon dynamics recorded by eastern equatorial Indian Ocean upper water-column structure. Quaternary Science Reviews, 77, 167-180, doi:10.1016/j.quascirev.2013.07.031

Palavras-Chave #121-758C; Age; AGE; Age model; Age model, LR04 Lisiecki & Raymo (2005); C. wuellerstorfi d18O; Calculated; Cibicidoides wuellerstorfi, d18O; Dd18O; Delta delta 18O; Depth; DEPTH, sediment/rock; DRILL; Drilling/drill rig; F. profunda; Florisphaera profunda; Fluorometry, size fraction 2-5 µm; G. ruber d13C; G. ruber d18O; Globigerinoides ruber, d13C; Globigerinoides ruber, d18O; Indian Ocean; Joides Resolution; Leg121; Mass spectrometer Finnigan MAT 252; Mass spectrometer IsoPrime DI-IRMS; N. dutertrei d13C; N. dutertrei d18O; Neogloboquadrina dutertrei, d13C; Neogloboquadrina dutertrei, d18O; Ocean Drilling Program; ODP; Sedimentation rate; Sed rate; vs. VPDB, +0.64 per mil, size fraction >150 µm; vs. VPDB, Globigerinoides ruber - Neogloboquadrina dutertrei; vs. VPDB, size fraction 212-300 µm; vs. VPDB, size fraction 250-300 µm
Tipo

Dataset