Paleoceanography

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Zinc concentrations in benthic foraminifera reflect seawater chemistry
Paleoceanography - Tập 15 Số 3 - Trang 299-306 - 2000
Thomas M. Marchitto, William B Curry, Delia W Oppo
We have measured Zn/Ca ratios in two taxa of Holocene‐aged benthic foraminifera from throughout the world's oceans. Zn/Ca is controlled by bottom water dissolved Zn concentration and, like Cd/Ca and Ba/Ca, by bottom water saturation state with respect to calcite. Measurements on “live‐collected” foraminifera suggest that the saturation effect occurs during growth and is not a postdepositio...... hiện toàn bộ
High‐amplitude variations in North Atlantic sea surface temperature during the early Pliocene warm period
Paleoceanography - Tập 24 Số 2 - 2009
K. T. Lawrence, Timothy D. Herbert, Catherine Brown, Maureen E. Raymo, Alan M. Haywood
We provide the first continuous, orbital‐resolution sea surface temperature (SST) record from the high‐latitude North Atlantic, a region critical to understanding the origin of the Plio‐Pleistocene ice ages and proximal to regions that became frequently glaciated after ∼2.7 Ma. We analyzed sediments from Ocean Drilling Program Site 982 over the last 4 Ma for their alkenone unsaturation ind...... hiện toàn bộ
A core top assessment of proxies for the ocean carbonate system in surface‐dwelling foraminifers
Paleoceanography - Tập 22 Số 3 - 2007
Yunyan Ni, Gavin L. Foster, T. R. Bailey, Tim Elliott, Daniela N. Schmidt, Paul N. Pearson, Brian A. Haley, Christopher D. Coath
We have assessed the reliability of several foraminifer‐hosted proxies of the ocean carbonate system (δ11B, B/Ca, and U/Ca) using Holocene samples from the Atlantic and Pacific oceans. We examined chemical variability over a range of test sizes for two surface‐dwelling foraminifers (Globigerinoides sacculifer and ... hiện toàn bộ
Possible roles of pH, temperature, and partial dissolution in determining boron concentration and isotopic composition in planktonic foraminifera
Paleoceanography - Tập 18 Số 4 - 2003
Michael W. Wara, M. L. Delaney, Thomas D. Bullen, Ana Christina Ravelo
We present the first continuous records from 0 to 5 Ma (in 0.333 m.y. integrated time steps) of paired boron/calcium (B/Ca) ratios and boron isotopes (δ11B) in the planktonic foraminifera Globogerinoides sacculifer (without sacc) from a site in the western equatorial Pacific Ocean (Ocean Drilling Program Site 806). These measurements, the fir...... hiện toàn bộ
B/Ca in planktonic foraminifera as a proxy for surface seawater pH
Paleoceanography - Tập 22 Số 2 - 2007
Jimin Yu, Henry Elderfield, Bärbel Hönisch
Boron isotope systematics indicate that boron incorporation into foraminiferal CaCO3 is determined by the partition coefficient, KD (= hiện toàn bộ
Vital effects in foraminifera do not compromise the use of δ11B as a paleo‐pH indicator: Evidence from modeling
Paleoceanography - Tập 18 Số 2 - 2003
Richard E. Zeebe, Dieter Wolf‐Gladrow, Jelle Bijma, Bärbel Hönisch
The stable boron isotope composition (δ11B) of fossil foraminiferal shells is used as a paleo‐pH recorder and is therefore one of the most promising paleocarbonate chemistry proxies (“paleoacidimetry”). One crucial question regarding this proxy is whether foraminifera record the pH of the bulk seawater or the ... hiện toàn bộ
Dust response to seasonal atmospheric forcing: Proxy evaluation and calibration
Paleoceanography - Tập 13 Số 5 - Trang 471-490 - 1998
Steven C. Clemens
Eolian grain size and flux were measured on samples from 11 Arabian Sea sediment traps deployed 200‐1250 km offshore. The timing of increased grain size is coincident with the onset of strong summer monsoon winds and dust storm activity over the Arabian Peninsula and Middle East. Data spanning a full annual cycle show that eolian grain size is highly correlated with barometric pressure (... hiện toàn bộ
A Pliocene‐Pleistocene stack of 57 globally distributed benthic δ18O records
Paleoceanography - Tập 20 Số 1 - 2005
L. E. Lisiecki, Maureen E. Raymo
We present a 5.3‐Myr stack (the “LR04” stack) of benthic δ18O records from 57 globally distributed sites aligned by an automated graphic correlation algorithm. This is the first benthic δ18O stack composed of more than three records to extend beyond 850 ka, and we use its improved signal quality to identify 24 new marine isotope stages in the early...... hiện toàn bộ
Determination of δ18O of Seawater in the Deep Ocean during the Last Glacial Maximum
Paleoceanography - Tập 8 Số 1 - Trang 1-6 - 1993
D. P. Schrag, Donald J. DePaolo
We present a method for determining the δ18O of seawater in the deep ocean during the last glacial maximum from the measured δ18O values of deep sea pore fluids. Using data from Deep Sea Drilling Project (DSDP) site 576 in the Western Pacific, this method yields a glacial to interglacial change in δ18Osw of...... hiện toàn bộ
Upper Eocene to Oligocene isotope (87Sr/86Sr, δ18O, δ13C) standard section, Deep Sea Drilling Project Site 522
Paleoceanography - Tập 3 Số 2 - Trang 223-233 - 1988
Kenneth G. Miller, Mark D. Feigenson, Dennis V. Kent, Richard K. Olsson
We improved upper Eocene to Oligocene deep‐sea chronostratigraphic control by integrating isotope (87Sr/86Sr, δ18O, δ13C) stratigraphy and magnetostratigraphy. Most previous attempts to establish the timing of isotope fluctuations have relied upon biostratigraphic age estimates which have uncertainties of 0...... hiện toàn bộ
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