Bottom-water oxygenation and environmental change in Santa Monica Basin, Southern California during the last 23 kyr

Balestra, Barbara; Krupinski, N. Quintana; Erohina, T.; Fessenden-Rahn, Julianna; Rahn, T.; Paytan, Adina

doi:10.1016/j.palaeo.2017.09.002

Cited by 21 publications

(29 citation statements)

References 65 publications

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“…In the Southern California Borderlands, the disciplinary convention has largely been to focus on the >150 µm size fraction and thus, quantifying this fraction is necessary for comparison to previously published studies (Balestra et al, 2018;Cannariato and Kennett, 1999;Moffitt et al, 2014). Our findings show that spatial trends in the >150 µm size fraction generally reflect those found in the >63 µm size fraction or are muted by the inclusion of the 63-150 315 µm.…”

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confidence: 54%

“…These trends are shown in both the >150 µm assemblage and in the complete assemblage (>63 µm). Not surprisingly, these taxa are commonly used as indicator species in previous studies (Balestra et al, 2018;Cannariato and Kennett, 1999;Moffitt et al, 2014). The species we identify as dysoxic and edge associated (B. spissa, U. peregrina, and B. argentea) are elongated in shape and are infaunal species.…”

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confidence: 66%

“…Our findings are consistent with observations from other regional records of oxygenation, including those from wellresolved records in nearby basins. Santa Monica Basin (SMB) and Santa Barbara Basin (SBB) are silled basins that 415 experience periodic flushing; changes in the strength or oxygen content of North Pacific Intermediate Water, stratification or surface productivity can lead to changes in oxygenation within each basin (Balestra et al, 2018;Cannariato and Kennett, 1999;Schimmelmann et al, 2013). Marine sediment records from Santa Monica Basin show non-annual laminations (indicating a low-oxygen to anoxic environment) beginning 1600 CE and document shoaling of the low-oxygen zone within the basin from 1600 CE to present (Christensen et al, 1994).…”

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confidence: 99%

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Southern California margin benthic foraminiferal assemblages across a modern environmental gradient record recent centennial-scale changes in oxygen minimum zone

Palmer¹,

Hill²,

Roopnarine³

et al. 2019

Preprint

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Abstract. Microfossil assemblages provide valuable records to investigate variability in continental margin biogeochemical cycles, including dynamics of the oxygen minimum zone (OMZ). Analyses of modern assemblages across environmental gradients are necessary to understand relationships between assemblage characteristics and environmental factors. Here, we analyzed five cores from the San Diego Margin (32&#176;42'00''&#8201;N, 117&#176;30'00''&#8201;W, 300&#8211;1175&#8201;m water depth) for core top benthic foraminiferal assemblages to understand relationships between community assemblages and spatial hydrographic gradients and down core to identify changes in the oxygen minimum zone through time. Comparisons of benthic foraminiferal assemblages from two size fractions (63&#8211;150 and >&#8201;150&#8201;&#956;m) exhibit similar trends across the spatial/environmental gradient, or in some cases exhibit more pronounced spatial trends in the >&#8201;150&#8201;&#956;m fraction. We identify two hypoxic associated species (B. spissa and U. peregrina), one oxic associated species (G. subglobosa) and one OMZ edge-associated species (B. argentea). A range of species diversity exists within the modern OMZ (1.5&#8211;2.6&#8201;H, Shannon Index), suggesting that diversity is not driven by oxygenation alone. Down core analysis of indicator species reveal variability in upper margin of the OMZ (528&#8201;m water depth) while the core of the OMZ (800&#8201;m) and below the OMZ (1175&#8201;m) remained stable in the last 1.5&#8201;ka. We document expansion of the upper margin of the OMZ beginning 400&#8201;ybp on the San Diego Margin that is synchronous with other regional records of oxygenation.

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confidence: 54%

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confidence: 66%

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confidence: 99%

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Southern California margin benthic foraminiferal assemblages across a modern environmental gradient record recent centennial-scale changes in oxygen minimum zone

Palmer¹,

Hill²,

Roopnarine³

et al. 2019

Preprint

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“…Planktic foraminifer Globigerina bulloides is very sensitive to the wind‐driven upwelling in the coastal region (Gupta et al, 2003; Saravanan et al, 2019). A number of proxy records have produced intermediate water δ 13 C and δ 18 O records spanning the interval from 32 to 10 kiloyears before the present (ka BP) in the Santa Barbara Basin and Santa Monica basins, California (Balestra et al, 2018; Hendy & Kennett, 1999; Ohkushi et al, 2013; Pak et al, 2012; Taylor et al, 2014), as well as planktic and benthic foraminiferal faunal records (Balestra et al, 2018; Hendy & Kennett, 2000) and geochemical data from the region (Chang et al, 2014; Gombiner et al, 2016; McClymont et al, 2012; Wang et al, 2019). The changes in deep ocean ventilation (alteration of marine carbon cycle) influence the global climate via changes in the concentration of CO 2 in the atmosphere (Marchitto et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Changes in Deep‐Sea Oxygenation in the Northeast Pacific Ocean During 32–10 ka

Saravanan

Gupta

Zheng

et al. 2020

Geophysical Research Letters

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Climatic variations in the northeastern (NE) Pacific Ocean have been related to the strength of intermediate water‐driven productivity and global ocean circulation. Productivity variations and ocean circulation during the late Quaternary may have caused changes in the intensity of the oxygen minimum zone (OMZ). To understand these changes in productivity and resultant OMZ fluctuations, we analyzed benthic foraminiferal assemblages from the Cascadia margin which reveal major faunal and ecological shifts associated with the millennial‐scale climate changes during ~32–10 ka. The intermediate waters were highly variable during ~20–14 ka with increased productivity and nutrient supply to the subsurface during circa 15.5–14.5 ka. Our results suggest that suboxic environmental conditions occurred during the warm interstadials, and the Bølling‐Ållerød event was favorable for the dysoxic species. Our results further indicate that paleoclimate variations in the northeast Pacific region were mainly driven by the Pacific Intermediate Water Current.

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“…Paleoceanographic reconstructions of bottom-water oxygenation during the last deglaciation are a valuable approach to understand the dynamics of OMZs during changing climatic conditions (e.g., Jaccard and Galbraith, 2012;Moffitt et al, 2015;Praetorius et al, 2015). The Eastern Equatorial Pacific (EEP) has been the focus of various paleoceanographic studies to unravel the dynamics of surface productivity and bottom-water oxygenation (Oberhänsli et al, 1990;Heinze and Wefer, 1992;Loubere, 1999;Hendy and Pedersen, 2006;Martinez and Robinson, 2010;Moffitt et al, 2014;Scholz et al, 2014;Salvatteci et al, 2016;Tetard et al, 2017;Balestra et al, 2018;Hoogakker et al, 2018). The region is characterized by a strong and shallow OMZ maintained as a result of persistent upwelling (Pennington et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Bottom-water deoxygenation at the Peruvian Margin during the last deglaciation recorded by benthic foraminifera

Erdem¹,

Schönfeld²,

Rathburn³

et al. 2019

Preprint

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Abstract. Deciphering the dynamics of dissolved oxygen in the mid-depth ocean during the last deglaciation is essential to understand the influence of climate change on modern oxygen minimum zones (OMZs). Many paleo-proxy records from the Eastern Pacific Ocean indicate an extension of oxygen depleted conditions during the deglaciation but the degree of deoxygenation has not been quantified to date. The Peruvian OMZ, one of the largest OMZs in the world, is a key area to monitor such changes in near-bottom water oxygenation in relation to changing climatic conditions. Here, we analysed the potential to use the composition of foraminiferal assemblages from the Peruvian OMZ as a quantitative redox-proxy. A multiple regression analysis was applied to a joint dataset of living (rose Bengal stained, fossilizable calcareous species) benthic foraminiferal distributions from the Peruvian continental margin. Bottom-water oxygen concentrations ([O2]BW) during sampling were used as dependant variable. The correlation was significant (R2 = 0.82; p

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Bottom-water oxygenation and environmental change in Santa Monica Basin, Southern California during the last 23 kyr

Cited by 21 publications

References 65 publications

Southern California margin benthic foraminiferal assemblages across a modern environmental gradient record recent centennial-scale changes in oxygen minimum zone

Southern California margin benthic foraminiferal assemblages across a modern environmental gradient record recent centennial-scale changes in oxygen minimum zone

Changes in Deep‐Sea Oxygenation in the Northeast Pacific Ocean During 32–10 ka

Bottom-water deoxygenation at the Peruvian Margin during the last deglaciation recorded by benthic foraminifera

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