Pichevin, Laetitia; Bard, Edouard; Martinez, Philippe; Billy, Isabelle (2007): Biogeochemical investigations on sediment core MD04-2876 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.727157, Supplement to: Pichevin, L et al. (2007): Evidence of ventilation changes in the Arabian Sea during the late Quaternary: Implication for denitrification and nitrous oxide emission. Global Biogeochemical Cycles, 21, GB4008, https://doi.org/10.1029/2006GB002852
Always quote citation above when using data! You can download the citation in several formats below.
Abstract:
Modern seawater profiles of oxygen, nitrate deficit, and nitrogen isotopes reveal the spatial decoupling of summer monsoon-related productivity and denitrification maxima in the Arabian Sea (AS) and raise the possibility that winter monsoon and/or ventilation play a crucial role in modulating denitrification in the northeastern AS, both today and through the past. A new high-resolution 50-ka record of d15N from the Pakistan margin is compared to five other denitrification records distributed across the AS. This regional comparison unveils the persistence of east-west heterogeneities in denitrification intensity across millennial-scale climate shifts and throughout the Holocene. The oxygen minimum zone (OMZ) experienced east-west swings across Termination I and throughout the Holocene. Probable causes are (1) changes in ventilation due to millennial-scale variations in Antarctic Intermediate Water formation and (2) postglacial reorganization of intermediate circulation in the northeastern AS following sea level rise. Whereas denitrification in the world's OMZs, including the western AS, gradually declined following the deglacial maximum (10-9 ka BP), the northeastern AS record clearly witnesses increasing denitrification from about 8 ka BP. This would have impacted the global Holocene climate through sustained N2O production and marine nitrogen loss.
Coverage:
Latitude: 24.842830 * Longitude: 64.008160
Event(s):
MD04-2876 * Latitude: 24.842830 * Longitude: 64.008160 * Elevation: -828.0 m * Recovery: 33 m * Location: Pakistan continental margin * Campaign: MD143 (CHAMAK) * Basis: Marion Dufresne (1995) * Method/Device: Calypso Corer (CALYPSO) * Comment: located within the present day OMZ (oxygen minimum zone)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets
Download Data
Datasets listed in this publication series
- Pichevin, L; Bard, E; Martinez, P et al. (2007): Age model of sediment core MD04-2876. https://doi.org/10.1594/PANGAEA.727192
- Pichevin, L; Bard, E; Martinez, P et al. (2007): Table 1. Organic carbon isotopic signal in core MD04-2876. https://doi.org/10.1594/PANGAEA.727156
- Pichevin, L; Bard, E; Martinez, P et al. (2007): Geochemistry on sediment core MD04-2876. https://doi.org/10.1594/PANGAEA.727154