Impact of salinity on element incorporation in two benthic foraminiferal species with contrasting magnesium contents

Geerken, Esmee; Nooijer, Lennart de; Dijk, Inge van; Reichart, Gert‐Jan

doi:10.5194/bg-15-2205-2018

Cited by 40 publications

(126 citation statements)

References 65 publications

Supporting

Mentioning

107

Contrasting

Order By: Relevance

“…Similar to reports for other inter-shell element distributions (e.g., Mg: Sadekov et al, 2005;Hathorne et al, 2009;Kunioka, 2006), Na appears to occur in bands of alternating high and low con-centrations (Geerken et al, 2018). However, the thickness and intensity of these bands is not similar between species (Geerken et al, 2018). For the planktonic species Globigerinoides ruber and Trilobatus sacculifer, elevated concentrations of Na are also observed in regions where the spines meet the rest of the shell wall (Branson et al, 2016;Mezger et al, 2018), close to the primary organic sheet (POS).…”

Section: Introductionsupporting

confidence: 83%

“…Furthermore, due to its conic shape, spine thickness decreases to- Figure 5. Comparison of most existing planktonic foraminifer Na/Ca-salinity studies, including different culture studies (Allen et al, 2016;Bertlich et al, 2018;Wit et al, 2013;Delaney et al, 1985), a field survey (Mezger et al, 2016) and a benthic culture study (Geerken et al, 2018) compared to new electron microprobe shell Na/Ca values of Red Sea plankton pumps, core tops and multi-nets (this study). Distinction had been made between EPMA and laser ablation (LA) measurements, where EPMA measurements refer to shell-only measurements.…”

Section: Unraveling Spines and Spine Base Na/camentioning

confidence: 99%

“…Furthermore, it has been suggested that calcite growth rate (Busenberg and Plummer, 1985), temperature (Allen et al, 2016), environmental differences between field and controlled growth experiments (Wit et al, 2013;Allen et al, 2016;Mezger et al, 2016), life stages ageing/leakage (Yoshimura et al, 2017), or organic linings (Yoshimura et al, 2017;Branson et al, 2016) affect Na incorporation. The inhomogeneous inter-shell distribution of sodium, partially due to life stage, could influence measured Na values (Geerken et al, 2018;Branson et al, 2016;Mezger et al, 2018) and potentially explain part of the observed differences. Similar to reports for other inter-shell element distributions (e.g., Mg: Sadekov et al, 2005;Hathorne et al, 2009;Kunioka, 2006), Na appears to occur in bands of alternating high and low con-centrations (Geerken et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…The inhomogeneous inter-shell distribution of sodium, partially due to life stage, could influence measured Na values (Geerken et al, 2018;Branson et al, 2016;Mezger et al, 2018) and potentially explain part of the observed differences. Similar to reports for other inter-shell element distributions (e.g., Mg: Sadekov et al, 2005;Hathorne et al, 2009;Kunioka, 2006), Na appears to occur in bands of alternating high and low con-centrations (Geerken et al, 2018). However, the thickness and intensity of these bands is not similar between species (Geerken et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Response to Prof. Ralf Schiebel (2)

Mezger¹

2019

Preprint

View full text Add to dashboard Cite

Sea surface salinity is one of the most important parameters to reconstruct in paleoclimatology, reflecting amongst other things the hydrological cycle, paleodensity, ice volume, and regional and global circulation of water masses. Recent culture studies and a Red Sea field study revealed a significant positive relation between salinity and Na incorporation within benthic and planktonic foraminiferal shells. However, these studies reported varying partitioning of Na between and within the same species. The latter could be associated with ontogenetic variations, most likely spine loss. Varying Na concentrations were observed in different parts of foraminiferal shells, with spines and regions close to the primary organic sheet being especially enriched in Na. In this study, we unravel the Na composition of different components of the planktonic foraminiferal shell wall using electron probe micro-analysis (EPMA) and solution ICP-MS. A model is presented to interpret EPMA data for spines and spine bases to quantitatively assess differences in composition and contribution to whole-shell Na/Ca signals. The same model can also be applied to other spatial inhomogeneities observed in foraminiferal shell chemistry, like elemental (e.g., Mg, Na, S) banding and/or hotspots. The relative contribution of shell carbonate, organic linings, spines and spine bases to whole-shell Na chemistry is considered quantitatively. This study shows that whereas the high Na areas may be susceptible to taphonomic alterations, the Na chemistry of the shell itself seems relatively robust. Comparing both shell and spine Na/Ca values with salinity shows that shell chemistry records salinity, albeit with a very modest slope.

show abstract

Section: Introductionsupporting

confidence: 83%

Section: Unraveling Spines and Spine Base Na/camentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Response to Prof. Ralf Schiebel (2)

Mezger¹

2019

Preprint

View full text Add to dashboard Cite

show abstract

“…Cl, Na). Even though Na is 40 considered as a conservative element in seawater, recent culture studies and a Red Sea field study reveal a significant positive relation between salinity and Na incorporation within benthic (Wit et al, 2013b;Geerken et al, 2018) and planktonic (Allen et al, 2016;Mezger et al, 2016;Bertlich et al, 2018) foraminiferal shells. This relation between salinity and Na incorporation, potentially related to an increase of the Na + /Ca 2+ activity ratio with salinity, is not only observed for foraminiferal calcite (Allen et al, 2016;Mezger et al, 2016;Wit et al, 2013b), but also for barnacles and Atlantic oyster shells (Rucker and Valentine, 45 1961;Gordon et al, 1970) and inorganically precipitated calcium carbonate (Kitano et al, 1975;Ishikawa and Ichikuni, 1984).…”

Section: Introductionmentioning

confidence: 99%

Planktonic foraminiferal spine versus shell carbonate Na incorporation in relation to salinity

Mezger¹,

Nooijer²,

Bertlich³

et al. 2018

Preprint

Self Cite

View full text Add to dashboard Cite

<p><strong>Abstract.</strong> Sea surface salinity is one of the most important parameters to reconstruct in paleoclimatology, reflecting amongst others the hydrological cycle, paleo-density, ice volume, and regional and global circulation of water masses. Recent culture studies and a Red Sea field study revealed a significant positive relation between salinity and Na incorporation within benthic and planktonic foraminiferal shells. However, these studies reported varying partitioning of Na between and within the same species. The latter could be associated with ontogenetic variations, most likely spine loss. Varying Na concentrations were observed in different parts of foraminiferal shells, with especially spines and regions close to the primary organic sheet being enriched in Na. In this study, we unravel the Na composition of different components of the planktonic foraminiferal shell wall using Electron Probe Micro Analysis (EPMA) and solution-ICP-MS. A model is presented to interpret EPMA data for spines and spine bases to quantitatively assess differences in composition and contribution to whole shell Na/Ca signals. The same model can also be applied to other spatial inhomogeneities observed in foraminiferal shell chemistry, like elemental (e.g. Mg, Na, S) banding and/or hotspots. The relative contribution of shell calcite, organic linings, spines and spine bases to whole shell Na chemistry is considered quantitatively. This study shows that whereas the high Na areas may be susceptible to taphonomy, the Na chemistry of the shell itself seems relatively robust. Comparing both shell and spine Na/Ca values with salinity shows that shell chemistry records salinity, albeit with a very modest slope.</p>

show abstract

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

Preprint

View full text Add to dashboard Cite

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

show abstract

Impact of salinity on element incorporation in two benthic foraminiferal species with contrasting magnesium contents

Cited by 40 publications

References 65 publications

Response to Prof. Ralf Schiebel (2)

Response to Prof. Ralf Schiebel (2)

Planktonic foraminiferal spine versus shell carbonate Na incorporation in relation to salinity

Tropical Sea Surface Temperatures following the Middle Miocene Climate Transition from Laser-Ablation ICP-MS analysis of glassy foraminifera

Contact Info

Product

Resources

About