MARC 主機 00000nam a2200373 4500
001 AAI1549038
005 20150827082944.5
008 150827s2013 ||||||||s|||||||| ||eng d
020 9781303600678
035 (MiAaPQ)AAI1549038
040 MiAaPQ|cMiAaPQ
100 1 Verbanaz, Ryan
245 10 Benthic foraminiferal assemblage analysis as part of the
larissa project for barilari bay, western Antarctic
Peninsula
300 91 p
500 Source: Masters Abstracts International, Volume: 52-04
500 Adviser: Scott Ishman
502 Thesis (M.S.)--Southern Illinois University at Carbondale,
2013
506 This item must not be sold to any third party vendors
506 This item must not be added to any third party search
indexes
520 This study used Jumbo Piston Core 126, collected from the
Nathaniel B. Palmer during cruise NBP10-01, to investigate
environmental variability in Barilari Bay, western
Antarctic Peninsula as part of the LARsen Ice Shelf System,
Antarctica (LARISSA) project. A total of 107 samples were
collected every 20cm from a 21.42m sediment core. Benthic
foraminiferal data from Jumbo Piston Core 126 was analyzed
using Principal Component (PC), Canonical Correspondence
Analysis (CCA), and cluster analyses to assist in the
Holocene oceanographic and climatic interpretation of
Barilari Bay. The first three principal components
explain 79.5% of the variance in the foraminiferal
abundance data. PC1 comprises 49.6% of the variance and
represents the Bulimina aculeata assemblage. PC2 and PC3
explain 16.3% and 13.6% of the variance and characterize
the Fursenkoina fusiformis and Pseudobolivina antarctica
assemblages, respectively. F. fusiformis assemblage
represents the presence of a less saline water mass
associated with ice shelf decay. The agglutinated P.
antarctica assemblage is indicative of Hyper Saline Shelf
Water (HSSW). TheB. aculeata assemblage is associated with
Upper Circumpolar Deep Water (UCDW) (Ishman and Domack,
1994) Sediments from ̃1100-950 calibrated years Before
Present (cal. yr BP) are characterized by theB. aculeata
assemblage, indicating the presence of UCDW. At ̃950 cal.
yr BP the UCDW receded coincident with glacial conditions
observed during what is interpreted as the Little Ice Age.
The ̃950-350 cal. yr BP interval represents glacial
conditions interpreted from the high PC scores of the P.
antarctica assemblage and low foraminiferal abundances due
to HSSW and a high sedimentation rate from glacial runoff.
Intermittent pulses of UCDW are observed in the 950-350
cal. yr BP interval, expressed by the PC peaks in the B.
aculeata assemblage. Between ̃300 and 100 cal. yr BP the
middle of the fjord was dominated by the F. fusiformis
assemblage, suggesting ice shelf decay and open marine
conditions. At ̃50 cal. yr BP UCDW progressed back into
Barilari Bay and is currently the dominant water mass
590 School code: 0209
650 4 Paleoclimate science
650 4 Marine geology
650 4 Paleoecology
690 0653
690 0556
690 0426
710 2 Southern Illinois University at Carbondale.|bGeology
773 0 |tMasters Abstracts International|g52-04(E)
856 40 |uhttps://pqdd.sinica.edu.tw/twdaoapp/servlet/
advanced?query=1549038
912 PQDT
