The mid-Brunhes Carbon Isotope Excursion - Evidence of Low Productivity in the Ocean?

Details The mid-Brunhes Carbon Isotope Excursion - Evidence of Low Productivity in the Ocean? The mid-Brunhes Carbon Isotope Excursion - Evidence of Low Productivity in the Ocean?

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmpp71b0398b&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #PP71B-0398

Physics

1615 Biogeochemical Processes (4805), 4806 Carbon Cycling, 4870 Stable Isotopes

Scientific paper

Evidence from both marine and continental records suggests that isotopic stages 11, 13 and 15 were particularly warm interglacials [Burckle, 1993; Droxler and Farrell, 2000]. The temperature during these interglacials may have been as much as 5°C warmer than today in North China, up to 3-6°C in the Himalayas, up to 3°C in Siberia and 4°C in the eastern Urals. Climate conditions in Siberia seemed to have been very stable during a time period of 110'000 yrs. One of the most striking observations in the oceanic realm is an increased carbonate accumulation in the North Atlantic, South Atlantic and North Pacific and enhanced carbonate dissolution in the Equatorial Pacific. New data from the stable isotopic composition of planktic foraminifera and the carbonate fine fraction reveals a pronounced positive δ13C excursion in all cores analyzed from the Atlantic and the Western Equatorial Pacific. This excursion, which coincides with the global dominance of Gephyrocapsa caribbeanica, started synchronously at the boundary of isotope stage 16/15 (620 ka ago) and ended at the boundary of isotope stage 8/7 (245ka). Such an excursion has been hitherto not generally observed in the record of benthic foraminifera and planktic foraminifera. The cause of this excursion is still not known. However, the evidence currently available suggests that major changes in the global environment took place, which we relate to an overall reduction in the primary productivity of the oceans. References Burckle, L.H., Late Quaternary interglacial stages warmer then present, Quaternary Science Reviews, 12, 825-831, 1993.
Droxler, A.W., and J.W. Farrell, Marine Isotope Stage 11 (MIS 11): new insights for a warm future, Global and Planetary Changes, 24, 1-5, 2000

Affiliated with

Also associated with

No associations

Rating

The mid-Brunhes Carbon Isotope Excursion - Evidence of Low Productivity in the Ocean? does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The mid-Brunhes Carbon Isotope Excursion - Evidence of Low Productivity in the Ocean?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The mid-Brunhes Carbon Isotope Excursion - Evidence of Low Productivity in the Ocean? will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1892584