Transport and Burial Rates of Be-10 and Pa-231 in the Pacific-Ocean during the Holocene Period

Publication Status is "Submitted" Or "In Press: 
LDEO Publication: 
Publication Type: 
Year of Publication: 
1992
Editor: 
Journal Title: 
Earth and Planetary Science Letters
Journal Date: 
Sep
Place Published: 
Tertiary Title: 
Volume: 
113
Issue: 
1-2
Pages: 
173-189
Section / Start page: 
Publisher: 
ISBN Number: 
0012-821X
ISSN Number: 
Edition: 
Short Title: 
Accession Number: 
ISI:A1992JT74700012
LDEO Publication Number: 
Call Number: 
Abstract: 

An ocean-wide study of the rates of removal of Be-10 and Pa-231 in the Pacific Ocean has identified intensified scavenging of the Be-10 and Pa-231 in several ocean margin areas, including the Northeastern and Northwestern Pacific, the Bering Sea, the Eastern Equatorial Pacific and the South Pacific Ocean. Scavenging rates of Be-10 and Pa-231 are clearly Correlated to particle flux. Principal component analysis further suggests that scavenging of Be-10 and Pa-231 may be related to opal productivity in surface waters. A simple box model was constructed to partition the deposition of Th-230, Pa-231 and Be-10 between open ocean and ocean margin sediments. Model parameters were constrained using measured values of Th-230 and Pa-231, which have a common source, and then applied to Be-10. An average Holocene Be-10 deposition rate for the entire Pacific Ocean is estimated to be approximately 1.5 x 10(6) atoms/cm2 yr-1, with approximately 70% of the total Be-10 supplied to the Pacific being deposited in margin sediments underlying only 10% of the ocean. The short residence times of Be-10 in ocean margin regions (from < 100 to approximately 200 yr) compared to the long Be-10 residence time in the central open Pacific Ocean (approximately 1000 yr) reflects the intensified scavenging of Be-10 in ocean margin waters. The results of this study suggest that the Pacific Ocean acts as a relatively closed basin with respect to the transport and burial of Be-10; therefore, the average Be-10 deposition rate in the Pacific Ocean can be used as an estimate of the global average production rate of Be-10 in the atmosphere during the Holocene period.

Notes: 

Jt747Times Cited:45Cited References Count:58

DOI: