Weber Michael E mike.weber@uni-bonn.de https://www.steinmann.uni-bonn.de/arbeitsgruppen/strukturgeologie/mitarbeiter/michael-e.-weber 0000-0003-2175-8980 Kawsar Masud mkshade0@gmail.com 0000-0002-7443-3111 Manoj M C manoj_mc@bsip.res.in 0000-0001-8112-6315 2024 Sortable silt Endmember model results for IODP Hole 354-U1452C dataset https://doi.org/10.1594/PANGAEA.949246 2024-09-30T00:00:30 Mean Sortable Silt (S͞S) size records in the hemipelagic deposits at Site U1452 (IODP 354) in the lower Bengal Fan is presented here to reconstruct the bottom water circulation strengths in the Bay of Bengal (BoB) during the last 200 ka (Marine Isotopic Stage 1 to 6). To eliminate possible amplitude shifts in S͞S size due to terrestrial sediment flux or turbiditic interventions, sedimentation history at the site is decomposed using End Member Analysis (EMA). S͞S size record in the BoB is mostly unimpacted by the terrestrial sediment flux and turbidity current deposition, hence the size sorting signature in SS records is best described to have arisen from benthic boundary layer current intensity. S͞S size record in the BoB indicates reduced bottom water flow speed during glacials (MIS 2 and 6), concomitant with greater import of Antarctic/Southern Ocean (SO) derived deep waters and increased speed during interglacials (MIS 1, 3 and 5) corresponding to increased proportion of Northern Atlantic derived deep watermass in the northern Indian Ocean. Glacial and stadial decline in flow speed reflects on the density reversal between two deep watermass end members in the SO and a shoaled Atlantic meridional overturning circulation (AMOC). On the other hand, faster flow speed during the climate optima at MIS 5.5 and other warm substages of MIS 5 as well as during the Holocene present a deep and strong AMOC. Reduced bottom water circulation strength in the BoB during the MIS 5.5 to 5.4 transition might have contributed to atmospheric CO2 drawdown and global cooling during the early stages of glacial inception along with deep circulation changes in the SO. Also, millennial-scale variability in circulation strength in the BoB are linked to oceanic frontal shift in high northern latitudes and deepwater formation manifesting in reduced flow strength associated with local cold anomalies (C28-C23), successively culminating into glacial inception at MIS 5.4. Reduced flow speed is also observed during some of the Heinrich events indicating a strong teleconnection between deep North Atlantic and BoB. Productivity changes in the BoB might as well have been influenced by variable fluxes of northern and southern sourced watermass during the last 200 ka. Kawsar Masud mkshade0@gmail.com 0000-0002-7443-3111 Manoj M C manoj_mc@bsip.res.in 0000-0001-8112-6315 Weber Michael E mike.weber@uni-bonn.de https://www.steinmann.uni-bonn.de/arbeitsgruppen/strukturgeologie/mitarbeiter/michael-e.-weber 0000-0003-2175-8980 2022 Reconstructing dynamics of northern and southern sourced bottom waters during the last 200 ka using sortable silt records in the lower Bengal Fan journal article Zeitschrift der Deutschen Gesellschaft für Geowissenschaften https://doi.org/10.1127/zdgg/2022/0318 101868 87.18186 87.18186 8.00681 8.00681 87.18186 8.00681 0.01 4.69 vertical profile IODP Integrated Ocean Drilling Program / International Ocean Discovery Program https://www.iodp.org/ 354-U1452C 8.00681 87.18186 -3671.5 Exp354 Exp354 Bengal Fan Bengal Fan 2015-01-29T00:00:00 2015-01-29 2015-03-31T00:00:00 2015-03-31 Joides Resolution https://www-odp.tamu.edu:443/resolutn.html France-Lanord, Christian France-Lanord, Christian Spieß, Volkhard Spieß, Volkhard Klaus, Adam Klaus, Adam Expedition 354 scientists Expedition 354 scientists Joides Resolution https://www-odp.tamu.edu:443/resolutn.html Core drilling CDRILL 1170 CC-BY-4.0 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ File name File name Weber Michael E mike.weber@uni-bonn.de https://www.steinmann.uni-bonn.de/arbeitsgruppen/strukturgeologie/mitarbeiter/michael-e.-weber 0000-0003-2175-8980 File name DEPTH, sediment/rock Depth sed m depth http://purl.obolibrary.org/obo/PATO_0001595 sediment http://purl.obolibrary.org/obo/ENVO_00002007 rock Length L http://dbpedia.org/resource/Length IODP Depth Scale Terminology hdl:10013/epic.50267.d001 Weber Michael E mike.weber@uni-bonn.de https://www.steinmann.uni-bonn.de/arbeitsgruppen/strukturgeologie/mitarbeiter/michael-e.-weber 0000-0003-2175-8980 CSF-A Depth sed [m] AGE Age ka BP http://en.wikipedia.org/wiki/Kyr age http://purl.obolibrary.org/obo/PATO_0000011 Time T http://dbpedia.org/resource/Time Weber Michael E mike.weber@uni-bonn.de https://www.steinmann.uni-bonn.de/arbeitsgruppen/strukturgeologie/mitarbeiter/michael-e.-weber 0000-0003-2175-8980 Age [ka BP] End member 1 EM1 % Weber Michael E mike.weber@uni-bonn.de https://www.steinmann.uni-bonn.de/arbeitsgruppen/strukturgeologie/mitarbeiter/michael-e.-weber 0000-0003-2175-8980 EM1 [%] End member 2 EM2 % Weber Michael E mike.weber@uni-bonn.de https://www.steinmann.uni-bonn.de/arbeitsgruppen/strukturgeologie/mitarbeiter/michael-e.-weber 0000-0003-2175-8980 EM2 [%] End member 3 EM3 % Weber Michael E mike.weber@uni-bonn.de https://www.steinmann.uni-bonn.de/arbeitsgruppen/strukturgeologie/mitarbeiter/michael-e.-weber 0000-0003-2175-8980 EM3 [%] End member 4 EM4 % Weber Michael E mike.weber@uni-bonn.de https://www.steinmann.uni-bonn.de/arbeitsgruppen/strukturgeologie/mitarbeiter/michael-e.-weber 0000-0003-2175-8980 EM4 [%] CurationLevelC Enhanced curation https://wiki.pangaea.de/wiki/Curation_levels citable Grain size data sortable silt author49 author88324 author92246 basis5 campaign3389729 campaign45727 curlevel30 event2882623 geocode1 geocode1599 geocode1600 geocode1601 geocode2205 geocode8128 journal16390 license21 method10903 method9338 param191680 param191681 param191682 param25541 param514792 pi49 project4048 ref115565 term1073131 term1073135 term38263 term41056 term43863 term43975 term47799 term50718 topotype3