In:
Paleoceanography, American Geophysical Union (AGU), Vol. 15, No. 1 ( 2000-02), p. 65-75
Abstract:
Eleven new Antarctic records of diatom‐bound δ 13 C org show significantly lighter values during the Last Glacial Maximum than during the Holocene with a general trend of increasing depletions southward of the modern Antarctic Polar Front (MAPF). In contrast, glacial diatoms from cores farther north of the MAPF show δ 13 C org values which are ∼1‰ heavier than during the Holocene. Likely causes for the low glacial δ 13 C org in Antarctic diatoms are higher [CO 2 ] aq , lower growth rates, and changes in diatom abundance or size. Taken at face value, the glacial depletions of δ 13 C org suggest that Antarctic surface waters south of the MAPF might have been a source of atmospheric p CO 2 during the glacial period. Alternatively, the glacial depletions might have been caused by either a relatively small decrease in growth rates or changes in the abundance of the two dominant diatom species or their average cell size. Interpretations of the Subantarctic records are complicated by similar uncertainties.
Type of Medium:
Online Resource
ISSN:
0883-8305
,
1944-9186
DOI:
10.1029/1999PA000369
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
2000
detail.hit.zdb_id:
637876-6
detail.hit.zdb_id:
2015231-0
detail.hit.zdb_id:
2916554-4
SSG:
16,13
SSG:
13
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