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A latitudinal productivity band in the central North Atlantic over the last 270 kyr: An alkenone perspective ArchiMer
Villanueva, J; Calvo, E; Pelejero, C; Grimalt, Jo; Boelaert, A; Labeyrie, L.
Productivity changes in the central North Atlantic Ocean have been traced by means of the total C-37 alkenone contents along two sediment cores located at 43 degreesN and 37 degreesN. Both alkenone signals revealed the occurrence of discrete productivity events every 23 kyr. Spectral analyses highlight the presence of a dominant 23-kyr periodicity in the alkenone signal, which is highly coherent to the precession index. However, a close comparison revealed small but relevant differences in the timing of several of the productivity events recorded at both locations. These asynchronies suggest that the alkenone maxima do not necessarily reflect a general increase of productivity over the North Atlantic. We propose that the events are related to a latitudinal...
Tipo: Text Palavras-chave: Biogeochemical cycles; Processes; And modeling Marine organic chemistry Organic and biogenic geochemistry.
Ano: 2001 URL: https://archimer.ifremer.fr/doc/00221/33192/31790.pdf
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