Nitrogen isotopic and opal record of sediments in the Gulf of California
Cobertura |
MEDIAN LATITUDE: 27.469830 * MEDIAN LONGITUDE: -112.104915 * SOUTH-BOUND LATITUDE: 27.469330 * WEST-BOUND LONGITUDE: -112.105500 * NORTH-BOUND LATITUDE: 27.470330 * EAST-BOUND LONGITUDE: -112.104330 |
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Data(s) |
13/01/1999
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Resumo |
High-resolution records of the nitrogen isotopic composition of organic matter (d15Norg), opal content, and opal accumulation rates from the central Gulf of California reveal large and abrupt variations during deglaciation and gradual Holocene changes coincident with climatic changes recorded in the North Atlantic. Homogenous sediments with relatively low d15Norg values and low opal content were deposited at the end of the last glacial period, during the Younger-Dryas event, and during the middle to late Holocene. In contrast, laminated sediments deposited in the two deglacial stages are characterized by very high d15Norg values (>14 per mil) and opal accumulation rates (29-41 mg/cm**2/yr). Abrupt shifts in d15Norg were driven by widespread changes in the extent of suboxic subsurface waters supporting denitrification and were amplified in the central gulf record due to variations in upwelling, vertical mixing, and/or the latitudinal position of the Intertropical Convergence Zone. |
Formato |
application/zip, 5 datasets |
Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.856821 doi:10.1594/PANGAEA.856821 |
Idioma(s) |
en |
Publicador |
PANGAEA |
Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
Fonte |
Supplement to: Pride, Carol; Thunell, Robert C; Sigman, Daniel M; Keigwin, Lloyd D; Altabet, Mark A; Tappa, Eric (1999): Nitrogen isotopic variations in the Gulf of California since the Last Deglaciation: Response to global climate change. Paleoceanography, 14(3), 397-409, doi:10.1029/1999PA900004 |
Palavras-Chave | #Acc rate opal; Accumulation rate, opal, per year; Age, 14C AMS; Age, 14C calibrated; Age, dated; Age, dated standard error; Age dated; Age std e; bSiO2; Calendar years; Calendar years, maximum/old; Calendar years, minimum/young; Cal yrs; Cal yrs max; Cal yrs min; d15N OM; delta 15N, organic matter; Depth; DEPTH, sediment/rock; Event; Lab label; Laboratory code/label; Opal, biogenic silica |
Tipo |
Dataset |