Salinity control on Na incorporation into calcite tests of the planktonic foraminifera &amp;lt;i&amp;gt;Trilobatus sacculifer&amp;lt;/i&amp;gt; – Evidence from culture experiments and surface sediments

Bertlich, Jacqueline; Nürnberg, Dirk; Hathorne, Ed C; Nooijer, Lennart de; Mezger, Eveline M.; Kienast, Markus; Nordhausen, Steffanie; Reichart, Gert‐Jan; Schönfeld, Joachim; Biȷma, Jelle

doi:10.5194/bg-2018-164

Cited by 7 publications

(12 citation statements)

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“…So far, paleosalinity has been calculated from stable isotope data of planktic foraminifers that live in surface waters (Malaizé & Caleye, 2009; Rohling, 2000). Since surface waters are directly affected by precipitation/evaporation processes, salinity differences are often much larger and easier to identify than in deep waters (i.e., Bertlich et al, 2018; Mezger et al, 2016; Mojtahid et al, 2019). Relatively large differences in salinity have also been analyzed from Na/Ca in cultured larger foraminifera and shallow water benthic foraminifers (Geerken et al, 2018; Hauzer et al, 2018; Wit et al, 2013).…”

Section: Resultsmentioning

confidence: 99%

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Deep Thermohaline Circulation Across the Closure of the Central American Seaway

Öğretmen

Schiebel

Jochum

et al. 2020

Paleoceanog and Paleoclimatol

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The closure of the Central American Seaway (CAS) resulted in changes of ocean‐climate dynamics since the late Miocene following the uplift of northern Andes. Reconstructing the bottom‐water temperatures (BWTs) of the Caribbean Sea illustrates feedbacks of the closure on the ocean‐climate system including deep‐water dynamics of the Caribbean Sea. Here, Mg/Ca‐derived BWTs of the Plio‐Pleistocene Caribbean Sea from the benthic foraminifer Cibicidoides wuellerstorfi are presented for the first time and interpreted along with Na/Ca and Sr/Ca as proxies of salinity and continental input, respectively. Our results highlight several warm (93, Gi15‐19, and N1) and cool (92, M2, Gi20, and CN4) marine isotope stages (MISs). Accordingly, changes in the circulation of deep‐water masses during the CAS closure developed in four main time intervals: (I) between 5.2 and 4.1 Ma (million years ago) BWT was ~1.1°C, (II) 4.1–3.2 Ma ~2.1°C, (III) 3.2–2.7 Ma ~2.7°C, and (IV) 2.7–2.2 Ma ~2.1°C. Relatively higher, gradually increased temperatures between 3.2 and 2.7 Ma correspond to late Pliocene warmth and restricted inflow of Pacific waters into the Caribbean due to shoaling of the CAS. In addition, Sr/Ca values reveal gradually escalating terrigenous input until 2.7 Ma most likely related to the increased river discharge in response to the Andean uplift. The gradual decrease of the BWTs from 2.7 Ma may have resulted from the onset of Northern Hemisphere Glaciation. Overall, BWTs match with previous sea surface temperatures from the planktic foraminifer Neogloboquadrina dutertrei. The BWTs presented here confirm intensified thermohaline circulation during the overall Pliocene warmth with increased bottom‐water Na/Ca values indicating enhanced salinity.

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Section: Resultsmentioning

confidence: 99%

“…Application of Na/Ca to paleoceanographic interpretations from benthic foraminifer calcite is a novel approach (Bertlich et al, 2018; Mezger et al, 2016; Mojtahid et al, 2019) to reconstruct past thermohaline circulation of the Caribbean Sea. Na/Ca has been measured using fs‐LA‐ICP‐MS.…”

Section: Resultsmentioning

confidence: 99%

Deep Thermohaline Circulation Across the Closure of the Central American Seaway

Öğretmen

Schiebel

Jochum

et al. 2020

Paleoceanog and Paleoclimatol

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“…Salinity can exert a secondary effect on foraminiferal Mg/Ca, sensitivity measurements from culture and core‐top studies show this to be ∼3–5% per practical salinity unit (psu) (Gray et al., 2018; Hollis et al., 2019; Hönisch et al., 2013; Kısakürek et al., 2008). In the absence of a robust, independent salinity proxy (although we do note the promise of Na/Ca [Bertlich et al., 2018; Geerken et al., 2018]) and the relatively minor effect of salinity on foraminiferal Mg/Ca, this potential secondary control is not empirically accounted for. Sunbird‐1 was located in a coastal setting and likely experienced a highly variable hydrological cycle due to changes in the position of the ITCZ making it susceptible to changes in salinity.…”

Section: Methodsmentioning

confidence: 95%

Tropical Sea Surface Temperatures Following the Middle Miocene Climate Transition From Laser‐Ablation ICP‐MS Analysis of Glassy Foraminifera

Nairn

Lear

Sosdian

et al. 2021

Paleoceanog and Paleoclimatol

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The mid-late Miocene is an important interval in the evolution of global climate through the Cenozoic, representing a key period in the transition out of the warm, dynamic climate state of the Miocene Climatic Optimum (MCO) into a more stable unipolar icehouse world (Badger et al., 2013; Foster et al., 2012; Greenop et al., 2014; Sosdian et al., 2018). Despite being characterized by similar to modern day atmospheric CO 2 concentrations (Foster et al., 2012; Sosdian et al., 2018; Super et al., 2018), middle Miocene mean global temperatures were likely significantly warmer than the modern day (Pound et al., 2011; Rousselle et al., 2013). This has been used to suggest a decoupling of global temperature and atmospheric CO 2 forcing (LaRiviere et al., 2012; Pagani et al., 1999), a characteristic which general circulation models struggle to simulate (Knorr et al., 2011; von der Heydt & Dijkstra, 2006). It has also been suggested that the late Miocene was an additional important key step in the transition to our modern climate state, as high latitudes cooled more than low latitudes, leading to a marked steepening of latitudinal temperature gradients (Herbert et al., 2016). The late Miocene Cooling (LMC) between ∼ 7.5 and 5.5 Ma was a global phenomenon (Herbert et al., 2016) perhaps associated with decreasing atmospheric pCO 2 (Stoll et al., 2019). The increase in the equator to pole surface temperature gradients was not associated with an increase in the benthic foraminiferal oxygen isotope record, implying that it occurred in the absence of a large increase in continental ice volume (Herbert et al., 2016). Polar amplification in the LMC is consistent with estimates for other time intervals (e.g., Cramwinckel et al., 2018). However, the LMC was also preceded by a significant cooling of mid to high southern and northern latitudes, a heterogenous cooling at high northern latitudes, and a muted, limited cooling in the tropics (Herbert et al., 2016). This heterogenous cooling perhaps suggests an unusually high polar amplification factor for the interval immediately preceding the LMC. Potential changes in the Earth System that could impact the magnitude of polar amplification include sea ice extent, vegetation induced changes in albedo, cloud cover, or ocean-atmosphere heat transport. Constraining the magnitude and timing of the

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“…In recent studies, from field work and culture experiments, the Na/Ca ratio of benthic and planktic tests was proposed as a salinity proxy (Bertlich et al., 2018; Mezger et al., 2016; Wit et al., 2013) showing different degrees of sensitivity according to species and experiments (Allen et al., 2016; Bertlich et al., 2018; Mezger et al., 2016; Mezger, de Nooijer, Siccha, 2018; Wit et al., 2013). In our experiments encompassing a smaller range of salinity, the Na/Ca shell response to the Na/Ca sw is not significantly affected by the salinities in G. siphonifera (Figure 8a, Table ).…”

Section: Discussionmentioning

confidence: 99%

Testing the Influence of Changing Seawater Ca Concentration on Elements/Ca Ratios in Planktic Foraminifera: A Culture Experiment

Houedec

Erez

Rosenthal

2021

Geochem Geophys Geosyst

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Reconstructions of past changes in the seawater elemental composition are essential for understanding geological processes that control the long-term evolution of Earth's climate. Some of these reconstructions are derived from the elemental chemistry of marine calcifying organisms mainly foraminifera and corals. Foraminiferal shells provide the best continuous stratigraphically resolved archive of the Cenozoic. Fundamental to these reconstructions is the ability to relate the elemental-calcium ratio (El/Ca) of the carbonate shells to the original seawater chemistry or physical conditions. This is typically done using distribution coefficients (D) relating the shells (El/Ca shell) to the seawater ratio (El/Ca sw), for example, variations in D Mg are widely used as a proxy of temperature. However, it has also been shown that, in addition to temperature, other environmental factors including the carbonate saturation state, pCO 2 and pH of the ambient seawater, can also influence the trace element composition of foraminiferal carbonate shells (e.g.,

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Salinity control on Na incorporation into calcite tests of the planktonic foraminifera <i>Trilobatus sacculifer</i> – Evidence from culture experiments and surface sediments

Cited by 7 publications

References 0 publications

Deep Thermohaline Circulation Across the Closure of the Central American Seaway

Deep Thermohaline Circulation Across the Closure of the Central American Seaway

Tropical Sea Surface Temperatures Following the Middle Miocene Climate Transition From Laser‐Ablation ICP‐MS Analysis of Glassy Foraminifera

Testing the Influence of Changing Seawater Ca Concentration on Elements/Ca Ratios in Planktic Foraminifera: A Culture Experiment

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