Silica depletion of the thermocline in the eastern North Pacific during glacial conditions: Clues from Ocean Drilling Program Site 893, Santa Barbara basin, California

Abstract

Research Article| July 01, 1997 Silica depletion of the thermocline in the eastern North Pacific during glacial conditions: Clues from Ocean Drilling Program Site 893, Santa Barbara basin, California W. H. Berger; W. H. Berger 1Scripps Institution of Oceanography, University of California–San Diego, La Jolla, California 92093-0215 Search for other works by this author on: GSW Google Scholar C. B. Lange; C. B. Lange 1Scripps Institution of Oceanography, University of California–San Diego, La Jolla, California 92093-0215 Search for other works by this author on: GSW Google Scholar A. Weinheimer A. Weinheimer 1Scripps Institution of Oceanography, University of California–San Diego, La Jolla, California 92093-0215 Search for other works by this author on: GSW Google Scholar Geology (1997) 25 (7): 619–622. https://doi.org/10.1130/0091-7613(1997)025<0619:SDOTTI>2.3.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation W. H. Berger, C. B. Lange, A. Weinheimer; Silica depletion of the thermocline in the eastern North Pacific during glacial conditions: Clues from Ocean Drilling Program Site 893, Santa Barbara basin, California. Geology 1997;; 25 (7): 619–622. doi: https://doi.org/10.1130/0091-7613(1997)025<0619:SDOTTI>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Sedimentation of opaline skeletons (diatoms, radiolarians) is greatly reduced during the last glacial period in the Santa Barbara basin, compared with the Holocene. The overall pattern is similar to that of the accumulation of organic matter, but differs in detail. Apparently, both silicate and phosphate supply are reduced during glacial time within the basin, which derives its surface waters and thermocline waters from the California Current. The pattern of reduced glacial diatom productivity suggests a decrease in the estuarine aspects of the subarctic North Pacific, as a result of decrease in excess precipitation (which dominates the present situation). Variability is greater in silicate accumulation than in organic matter accumulation. We hypothesize that this difference is due to greater sensitivity of silicate to changes in nutrient enrichment and depletion in subsurface waters, as compared with phosphate. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.