FN Archimer Export Format
PT J
TI Neogene mass accumulation rate of carbonate sediment across northern Zealandia, Tasman Sea, southwest Pacific
BT 
AF Sutherland, R.
   Santos, Z. Dos
   Agnini, C.
   Alegret, L.
   Lam, A.R.
   Westerhold, T.
   Drake, M.K.
   Harper, D.T.
   Dallanave, E.
   Newsam, C.
   Cramwinkel, M.J.
   Dickens, G.R.
   Collot, J
   Etienne, S.J.G.
   Bordenave, A.
   Stratford, W.R.
   Zhou, X.
   Li, H.
   Asatryan, G.
AS 1:1;2:1;3:2;4:3;5:4;6:5;7:6;8:7;9:5;10:8;11:9;12:10;13:11;14:11;15:11;16:12;17:13;18:14;19:15;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;14:;15:;16:;17:;18:;19:;
C1 Victoria University of Wellington, PO Box 600 Wellington, New Zealand
   Università di Padova 35131Padova ,Italy
   Universidad de Zaragoza ,50009 Zaragoza ,Spain
   University of Massachusetts, Amherst MA01003‐9297 ,USA
   MARUM ,University of Bremen ,28359 Bremen ,Germany
   University of California Santa Cruz ,CA95064, USA
   University of Kansas ,Lawrence KS66045‐7575, USA
   University College London, London WC1E 6BT ,UK
   National Oceanography Centre ,University of Southampton Southampton SO14 3ZH ,UK
   Trinity College, Dublin Dublin 2, Ireland
   Geological Survey of New Caledonia ,Noumea BP 465 ,New Caledonia
   GNS Science, PO Box30368 Lower Hutt ,New Zealand
   Rutgers, The State University of New Jersey NJ08854 ,USA
   Institute of Oceanology ,Chinese Academy of Sciences Qingdao, China
   Leibniz‐Institut für Evolutions und Biodiversitätsforschung ,10115 Berlin, Germany
C2 UNIV WELLINGTON VICTORIA, NEW ZEALAND
   UNIV PADOVA, ITALY
   UNIV ZARAGOZA, SPAIN
   UNIV MASSACHUSETTS, USA
   UNIV BREMEN MARUM, GERMANY
   UNIV CALIFORNIA SANTA CRUZ, USA
   UNIV KANSAS, USA
   UNIV COLLEGE LONDON, UK
   NOC, UK
   TRINITY COLL DUBLIN, IRELAND
   GEOL SURVEY NEW CALEDONIA, FRANCE
   GNS SCIENCE, NEW ZEALAND
   UNIV RUTGERS STATE, USA
   CHINESE ACAD SCI, CHINA
   LEIBNIZ INST EVOL BIODIVERS SCI, GERMANY
IF 3.5
TC 9
UR https://archimer.ifremer.fr/doc/00747/85929/91185.pdf
   https://archimer.ifremer.fr/doc/00747/85929/91186.pdf
LA English
DT Article
CR TECTA
BO L'Atalante
DE ;paleoceanography;biogenic;bloom;Neogene;Miocene;Pliocene
AB Sediment mass accumulation rate (MAR) is a proxy for paleoceanographic conditions, especially if biological productivity generated most of the sediment. We determine MAR records from pelagic calcareous sediments in Tasman Sea based on analysis of 11 boreholes and >3 million seismic reflection horizon picks. Seismic data from regions of 10,000-30,000 km2 around each borehole were analyzed using data from International Ocean Discovery Program (IODP) Expedition 371 and other boreholes. Local MAR was affected by deep-water currents that winnowed, eroded or deposited seafloor sediment. Therefore, it is necessary to average MARs across regions to test paleoceanographic and productivity models. MARs during the Miocene Climate Optimum (MCO, 18-14 Ma) were slightly lower than Quaternary values, but increased on southern Lord Howe Rise at 14-13 Ma, when global climate became colder. Intensification of the Indian and East Asian monsoons at ∼8 Ma and ∼3.6 Ma approximately correspond to the start and end, respectively, of the Biogenic Bloom, which had MARs at least double Quaternary values. On northern Lord Howe Rise we recognize peak MARs at∼7 Ma and ∼5 Ma. There is no correlation between Neogene MAR and ocean pH or atmospheric CO2 concentration. Neogene MARs are on average higher than Quaternary values. We posit that future long-term productivity in the southwest Pacific could be higher than Quaternary values, but new computer models that can fit our observations are required to test this hypothesis. Plain Language Summary Global climate is likely to get warmer and we want to know what will happen to marine life. We can study ancient warm periods to better predict the future. The ocean is a global carbon sink, because some organisms form shells by combining calcium with carbon dioxide dissolved in seawater. Once dead, their calcium carbonate shells sink to the seabed. Over millions of years, the southwest Pacific accumulated huge deposits. We used geophysical surveying and drilling to measure this history of deposition, which is a proxy for ancient biological productivity (how much marine life existed). A warm period 18-14 million years ago had high atmospheric carbon dioxide (2 to 4 times pre-industrial levels) and slightly lower ocean productivity. In contrast, 8 to 4 million years ago, atmospheric carbon dioxide was similar to predicted 21st Century levels and productivity was much higher: more than double recent values. Rates of calcium carbonate deposition in the past do not correlate with ocean acidity or atmospheric carbon dioxide; but they were mostly higher than today. Hence, long-term biological productivity and carbon sequestration in the southwest Pacific might increase in future, but computer models that fit our observations are needed to test this idea. 
PY 2022
PD FEB
SO Paleoceanography And Paleoclimatology
SN 2572-4517
PU American Geophysical Union (AGU)
VL 37
IS 2
UT 000763496800013
DI 10.1029/2021PA004294
ID 85929
ER

EF