Stable oxygen and carbon isotopic composition of foraminifera and sea water from the Arctic Ocean ...

• Main Authors: van Donk, Jan, Mathieu, Guy
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1969
• Subjects: Oceanography; FOS Earth and related environmental sciences; Arctic Ocean; Foraminifera*
• Online Access: https://dx.doi.org/10.1594/pangaea.730373; https://doi.pangaea.de/10.1594/PANGAEA.730373

O18/O16 data on a depth profile of water samples from the Arctic Ocean reveal that near surface water is depleted in O18 by about 4 per mil, but water at depths greater than 350 meters reaches near normal open ocean water composition. The O18 profile very closely follows the salinity profile, with deltaO18 changing by about 0.8 per mil per 1 per mil salinity change. The results of deltaO18 measurements on the pelagic species Globigerina pachyderma from a composite core show that the deltaO18 value has not changed since the latter part of the last glacial period. This constancy we take to indicate that the temperature and the deltaO18 value of the water in which these foraminifera grew have not changed significantly since that time. Such a conclusion seems to imply that the present ice coverage in the Arctic Ocean has remained unchanged during the last 25,000 years. However, the deltaO18 value of benthonic foraminifera shows a shift of 1.2 per mil between the end of the last glacial period and the present ... : Supplement to: van Donk, Jan; Mathieu, Guy (1969): Oxygen isotope composition of foraminifera and water samples from the Arctic Ocean. Journal of Geophysical Research: Oceans, 74(13), 3396-3407 ...