GDGT and alkenone flux in the northern Gulf of Mexico: Implications for the TEX86 and UK'37 paleothermometers

Richey, Julie N.; Tierney, Jessica E.

doi:10.1002/2016pa003032

Cited by 40 publications

(58 citation statements)

References 81 publications

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“…When we prescribe the calculated pH for the depth intervals in the multicore, and solve for SST using the paired Mg/Ca‐δ 18 O (Tables S3 and S4, supporting information), we get an increasing temperature trend from Mg/Ca‐δ 18 O that is equivalent to 0.31 °C from 1950 to 2000 for G. ruber (white), 0.37 °C for G. ruber pink, both of which are consistent with the warming trend recorded by U

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and TEX 86 (Richey & Tierney, ) in the same sediment cores (0.36 °C and 0.25 °C, respectively; Figure ). If we calculate SST warming using an equation that only accounts for temperature and salinity influence on Mg/Ca (T‐HL‐NA), we get a 1.9 °C warming from 1950 to 2000, whereas using the Anand et al () equation results in a 1.4 °C warming (4 times the warming estimated from other proxies).…”

Section: Resultssupporting

confidence: 70%

“…collected from the nGoM sediment trap site in 2013 (Figure ). The multicore captured the intact sediment‐water interface, and an age model was generated based on 210 Pb analyses (Richey & Tierney, ). The down core Mg/Ca and δ 18 O c values for pink and white G. ruber are not significantly different from each other.…”

Section: Resultsmentioning

confidence: 99%

“…Gray dashed line shows the decadally filtered mean annual HadISST (Rayner et al, ). TEX 86 and U

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‐SST were published in Richey and Tierney (). Globigerinoides ruber pink and white Mg/Ca was converted to SST using the multivariate equation of Gray et al () that accounts for temperature, salinity, and pH influence on foraminiferal Mg/Ca.…”

Section: Resultsmentioning

confidence: 99%

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Considerations for Globigerinoides ruber (White and Pink) Paleoceanography: Comprehensive Insights From a Long‐Running Sediment Trap

Richey

Thirumalai

Khider

et al. 2019

Paleoceanog and Paleoclimatol

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We present a detailed analysis of the seasonal distribution, size, morphological variability, and geochemistry of co‐occurring pink and white chromotypes of Globigerinoides ruber from a high‐resolution (1–2 weeks) and long‐running sediment trap time series in the northern Gulf of Mexico. We find no difference in the seasonal flux of the two chromotypes. Although flux of G. ruber is consistently lowest in winter, the flux‐weighted signal exported to marine sediments represents mean annual conditions in the surface mixed layer. We observe the same morphological diversity among pink specimens of G. ruber as white. Comparison of the oxygen and carbon isotopic composition (δ18O and δ13C) of two morphotypes (sensu stricto and sensu lato) of pink G. ruber reveals the isotopes to be indistinguishable. The test size distribution within the population varies seasonally, with the abundance of large individuals increasing (decreasing) with increasing (decreasing) sea surface temperature. We find no systematic offsets in the Mg/Ca and δ18O of co‐occurring pink and white G. ruber. The sediment trap data set shows that the Mg/Ca‐temperature sensitivity for both chromotypes is much lower than the canonical 9%/°C, which can likely be attributed to the secondary influence of both salinity and pH on foraminiferal Mg/Ca. Using paired Mg/Ca and δ18O, we evaluate the performance of a suite of published equations for calculating sea surface temperature, sea surface salinity, and isotopic composition of seawater (δ18Osw), including a new salinity‐δ18Osw relationship for the northern Gulf of Mexico from water column observations.

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Section: Resultssupporting

confidence: 70%

Section: Resultsmentioning

confidence: 99%

“…Gray dashed line shows the decadally filtered mean annual HadISST (Rayner et al, ). TEX 86 and U

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Section: Resultsmentioning

confidence: 99%

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Considerations for Globigerinoides ruber (White and Pink) Paleoceanography: Comprehensive Insights From a Long‐Running Sediment Trap

Richey

Thirumalai

Khider

et al. 2019

Paleoceanog and Paleoclimatol

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“…Indeed, isoGDGTs likely require pelleting to sink effectively through the water column to the ocean floor (e.g., Schouten et al 2013). As phytoplankton blooms mostly occur during Antarctic summer/autumn, as do their predators, the copepods (SchnackSchiel, 2001), we expect the highest isoGDGT fluxes to the sediment during the summer in the Southern Ocean, despite their primary production during a different season (Church et al, 2003;Murray et al, 1998;Richey and …”

mentioning

confidence: 99%

Oligocene TEX86-derived seawater temperatures from offshore Wilkes Land (East Antarctica)

Hartman

Sangiorgi

Salabarnada

et al. 2017

Preprint

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Abstract. Today, the temperature of the surface waters near the Antarctic coast is a determining factor in the formation of Antarctic Bottom Water (AABW) through sea-ice production, sea-ice extent, and the extent of the ice shelf. O variability is due to large glacial-interglacial bottom-water temperature shifts, the Oligocene Antarctic ice volume was less sensitive to climate change than previously assumed. 45Clim. Past Discuss., https://doi

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“…; Table 2), and indicate the advection of terrestrial material offshore via deep downslope transport (Richey and Tierney, 2016).…”

Section: Source Area Of Sinking Aggregates: Lateral Advection Versus mentioning

confidence: 99%

The ecosystem baseline for particle flux in the Northern Gulf of Mexico

Giering¹,

Yan

Sweet

et al. 2018

Elementa: Science of the Anthropocene

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Response management and damage assessment during and after environmental disasters such as the Deepwater Horizon (DWH) oil spill require an ecological baseline and a solid understanding of the main drivers of the ecosystem. During the DWH event, a large fraction of the spilled oil was transported to depth via sinking marine snow, a routing of spilled oil unexpected to emergency response planners. Because baseline knowledge of particle export in the Northern Gulf of Mexico and how it varies spatially and temporally was limited, we conducted a detailed assessment of the potential drivers of deep (~1400 m depth) particle fluxes during 2012-2016 using sediment traps at three contrasting sites in the Northern Gulf of Mexico: near the DWH site, at an active natural oil seep site, and at a site considered typical for background conditions. The DWH site, located ~70 km from the Mississippi River Delta, showed flux patterns that were strongly linked to the Mississippi nitrogen discharge and an annual subsequent surface bloom. Fluxes carried clear signals of combustion products, which likely originated from pyrogenic sources that were transported offshore via the Mississippi plume. The seep and reference sites were more strongly influenced by the open Gulf of Mexico, did not show a clear seasonal flux pattern, and their overall sedimentation rates were lower than those at the DWH site. At the seep site, based on polycyclic aromatic hydrocarbon data, we observed indications of three different pathways for "natural" oiled-snow sedimentation: scavenging by sinking particles at depth, weathering at the surface before incorporation into sinking particles, and entry into the food web and subsequent sinking in form of detritus. Overall, sedimentation rates at the three sites were markedly different in quality and quantity owing to varying degrees of riverine and oceanic influences, including natural seepage and contamination by combustion products.

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GDGT and alkenone flux in the northern Gulf of Mexico: Implications for the TEX₈₆ and U^K'₃₇ paleothermometers

Cited by 40 publications

References 81 publications

Considerations for Globigerinoides ruber (White and Pink) Paleoceanography: Comprehensive Insights From a Long‐Running Sediment Trap

Considerations for Globigerinoides ruber (White and Pink) Paleoceanography: Comprehensive Insights From a Long‐Running Sediment Trap

Oligocene TEX<sub>86</sub>-derived seawater temperatures from offshore Wilkes Land (East Antarctica)

The ecosystem baseline for particle flux in the Northern Gulf of Mexico

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GDGT and alkenone flux in the northern Gulf of Mexico: Implications for the TEX86 and UK'37 paleothermometers

Cited by 40 publications

References 81 publications

Considerations for Globigerinoides ruber (White and Pink) Paleoceanography: Comprehensive Insights From a Long‐Running Sediment Trap

Considerations for Globigerinoides ruber (White and Pink) Paleoceanography: Comprehensive Insights From a Long‐Running Sediment Trap

Oligocene TEX&lt;sub&gt;86&lt;/sub&gt;-derived seawater temperatures from offshore Wilkes Land (East Antarctica)

The ecosystem baseline for particle flux in the Northern Gulf of Mexico

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Product

Resources

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GDGT and alkenone flux in the northern Gulf of Mexico: Implications for the TEX₈₆ and U^K'₃₇ paleothermometers

Oligocene TEX<sub>86</sub>-derived seawater temperatures from offshore Wilkes Land (East Antarctica)