Chlorophyll blooms induced by tropical cyclone Vardah in the Bay of Bengal
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Abstract Detailed reconstruction of Indian summer monsoons is necessary to better understand the late Quaternary climate history of the Bay of Bengal and Indian peninsula. We established a chronostratigraphy for a sediment core from Hole 19B in the western Bay of Bengal, extending to approximately 80 kyr BP and examined major and trace element compositions and clay mineral components of the sediments. Higher δ 18 O values, lower TiO 2 contents, and weaker weathering in the sediment source area during marine isotope stages (MIS) 2 and 4 compared to MIS 1, 3, and 5 are explained by increased Indian summer monsoonal precipitation and river discharge around the western Bay of Bengal. Clay mineral and chemical components indicate a felsic sediment source, suggesting the Precambrian gneissic complex of the eastern Indian peninsula as the dominant sediment source at this site since 80 kyr. Trace element ratios (Cr/Th, Th/Sc, Th/Co, La/Cr, and Eu/Eu*) indicate increased sediment contributions from mafic rocks during MIS 2 and 4. We interpret these results as reflecting the changing influences of the eastern and western branches of the Indian summer monsoon and a greater decrease in rainfall in the eastern and northeastern parts of the Indian peninsula than in the western part during MIS 2 and 4.
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Other| January 01, 1997 Seasonal variation in the flux of planktic Foraminifera; sediment trap results from the Bay of Bengal, northern Indian Ocean M. V. S. Guptha; M. V. S. Guptha University of Hamburg, Institute of Biogeochemistry and Marine Chemistry, Hamburg, Federal Republic of Germany Search for other works by this author on: GSW Google Scholar W. B. Curry; W. B. Curry Search for other works by this author on: GSW Google Scholar V. Ittekkot; V. Ittekkot Search for other works by this author on: GSW Google Scholar A. S. Muralinath A. S. Muralinath Search for other works by this author on: GSW Google Scholar Journal of Foraminiferal Research (1997) 27 (1): 5–19. https://doi.org/10.2113/gsjfr.27.1.5 Article history first online: 03 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation M. V. S. Guptha, W. B. Curry, V. Ittekkot, A. S. Muralinath; Seasonal variation in the flux of planktic Foraminifera; sediment trap results from the Bay of Bengal, northern Indian Ocean. Journal of Foraminiferal Research 1997;; 27 (1): 5–19. doi: https://doi.org/10.2113/gsjfr.27.1.5 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 SocietyJournal of Foraminiferal Research Search Advanced Search 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.
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The phytoplankton taxonomic composition of the subsurface chlorophyll maximum layer (SCM) was compared with that of the surface layer in July, September and November 1979 in the western North Pacific Ocean. Besides the use of chemical fixatives for preservable phytoplankton, serial dilution culture method was employed for non-preservable flagellates and monads, i.e., fragile forms. The SCM was characterized by a high species diversity of preservable phytoplankton and by the numerical dominance of fragile forms. Among the fragile forms, Micromonas and Ochromonas were dominant. This dominance is consistent with their viability at low light intensity. Cluster analysis revealed that, for blue-green algae, coccolithophorids, silicoflagellates and diatoms, a marked difference existed in species assemblages between the SCM and the surface but there was no distinct difference in dinoflagellate assemblages. The difference between both layers is discussed, as related to the mechanisms of formation of the SCM.
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