Isotopic signals in two morphotypes of Globigerinoides ruber (white) from the South China Sea: implications for monsoon climate change during the last glacial cycle

Wang, Luejiang

doi:10.1016/s0031-0182(00)00094-8

Cited by 166 publications

(200 citation statements)

References 25 publications

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“…6) and thus unrealistically cold. By using the Shackleton (1974) equation the average habitat depth of G. ruber (white) agrees well with the other published estimates of 0-30 m and 30-50 m, respectively (Wang, 2000;Kuroyanagi et al, 2008;Numberger et al, 2009). Therefore, we use the Shackleton (1974) equation in the following discussion.…”

Section: Temperature and Salinitysupporting

confidence: 87%

“…Kuroyanagi et al (2008) found systematic morphological differences between two morphotypes which is consistent with the concept of Wang (2000). As defined in Numberger et al (2009) G. ruber type normal, comparable to type sensu stricto (s.s.) according to the definition by Wang (2000), lives in the top 50 m of the water column during summer/early autumn and has a very constant depth habitat (Numberger et al, 2009). G. ruber type platys (Numberger et al, 2009) is comparable to the type sensu lato (s.l.)…”

Section: Temperature and Salinitysupporting

confidence: 76%

“…One possible cause is the presence of at least three genetically distinct morphotypes within the white variety of G. ruber (Numberger et al, 2009). Kuroyanagi et al (2008) found systematic morphological differences between two morphotypes which is consistent with the concept of Wang (2000). As defined in Numberger et al (2009) G. ruber type normal, comparable to type sensu stricto (s.s.) according to the definition by Wang (2000), lives in the top 50 m of the water column during summer/early autumn and has a very constant depth habitat (Numberger et al, 2009).…”

Section: Temperature and Salinitysupporting

confidence: 66%

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Core-top calibration of δ18O and δ13C of G. ruber (white) and U. mediterranea along the southern Adriatic coast of Italy

Grauel

Bernasconi

2010

Marine Micropaleontology

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Section: Temperature and Salinitysupporting

confidence: 87%

Section: Temperature and Salinitysupporting

confidence: 76%

Section: Temperature and Salinitysupporting

confidence: 66%

See 1 more Smart Citation

Core-top calibration of δ18O and δ13C of G. ruber (white) and U. mediterranea along the southern Adriatic coast of Italy

Grauel

Bernasconi

2010

Marine Micropaleontology

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“…For G. ruber, both G. ruber sensu stricto (ss) and G. ruber sensu lato (sl) were combined for analysis, due to low abundance in most samples throughout the study period. Variations in both δ 18 O and Mg/Ca between the two morphotypes have been reported (Steinke et al, 2005;Wang, 2000), although a recent sediment trap study suggests that δ 18 O values between the two morphotypes are statistically indistinguishable (Thirumalai et al, 2014). Nonetheless, we acknowledge combining the morphotypes may contribute to variability in the G. ruber analyses.…”

Section: Sediment Trap Sample δ 18 O and Mg/ca Analysesmentioning

confidence: 77%

Evaluating controls on planktonic foraminiferal geochemistry in the Eastern Tropical North Pacific

Gibson

Thunell

Fehrenbacher

et al. 2016

Earth and Planetary Science Letters

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between mixed-layer species G. ruber and G. bulloides and thermocline-dweller G. menardii track seasonal changes in upwelling. The records suggest an increase in upwelling during the peak positive phase of El Niño, and an overall reduction in stratification over the six-year period. For all three species, Mg/Ca ratios are higher than what has been reported in previous studies, and show poor correlations to calcification temperature. We suggest that low pH (7.6-8.0) and [CO 3 2− ] values (∼70-120 μmol/kg) in the mixed layer contribute to an overall trend of higher Mg/Ca ratios in this region. Laser Ablation Inductively Coupled Mass Spectrometry analyses of G. bulloides with high Mg/Ca ratios (>9 mmol/mol) reveal the presence of a secondary coating of inorganic calcite that has Mg/Ca and Mn/Ca ratios up to an order of magnitude higher than these elemental ratios in the primary calcite, along with elevated Sr/Ca and Ba/Ca ratios. Some of the samples with abnormally high Mg/Ca are found during periods of high primary productivity, suggesting the alteration may be related to changes in carbonate saturation resulting from remineralization of organic matter in oxygen-poor waters in the water column. Although similar shell layering has been observed on fossil foraminifera, this is the first time such alteration has been studied in shells collected from the water column. Our results suggest a role for seawater carbonate chemistry in influencing foraminiferal calcite trace element:calcium ratios prior to deposition on the seafloor, particularly in high-productivity, low-oxygen environments.

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“…The average SR at 39KL is about 34 cm kyr -1 , with no considerable differences between MIS3 (~32 cm kyr -1 ), the last deglaciation (~34 cm kyr -1 ) and the Holocene (~37 cm kyr -1 ). 55 from the 250-355 µm size-fraction. Previous sediment trap 56 and sediment surface 50,51 studies suggest that G. ruber tests record mean annual mixed-layer conditions in the tropical eastern Indian Ocean, and particularly mean annual surface conditions in the study area 51 .…”

Section: Age Modelsmentioning

confidence: 99%

North Atlantic forcing of tropical Indian Ocean climate

Mohtadi

Prange

Oppo

et al. 2014

Nature

246

228

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The response of the tropical climate in the Indian Ocean realm to abrupt climate change events in the North Atlantic Ocean is contentious. Repositioning of the intertropical convergence zone is thought to have been responsible for changes in tropical hydroclimate during North Atlantic cold spells 1-5 , but the dearth of high-resolution records outside the monsoon realm in the Indian Ocean precludes a full understanding of this remote relationship and its underlying mechanisms. Here we show that slowdowns of the Atlantic meridional overturning circulation during Heinrich stadials and the Younger Dryas stadial affected the tropical Indian Ocean hydroclimate through changes to the Hadley circulation including a southward shift in the rising branch (the intertropical convergence zone) and an overall weakening over the southern Indian Ocean. Our results are based on new, high-resolution sea surface temperature and seawater oxygen isotope records of well dated sedimentary archives from the tropical eastern Indian Ocean for the past 45,000 years, combined with climate model simulations of Atlantic circulation slowdown under Marine Isotope Stages 2 and 3 boundary conditions. Similar conditions in the east and west of the basin rule out a zonal dipole structure as the dominant forcing of the tropical Indian Ocean hydroclimate of millennial-scale events. Results from our simulations and proxy data suggest dry conditions in the northern Indian Ocean realm and wet and warm conditions in the southern realm during North Atlantic cold spells.In the North Atlantic, the most recent glacial and deglacial periods are characterized by a series of abrupt and severe cold snaps of millennial duration associated with either iceberg instabilities and surges (Heinrich events) or freshwater input from the Arctic Ocean 6 (the Younger Dryas). These abrupt events are of particular interest because they were rapidly communicated through the ocean by a slowdown, or potentially a shutdown, of the Atlantic meridional overturning circulation 7 (AMOC) and through the atmospheric circulation 8 causing climate anomalies worldwide. Climate archives document a significant tropical hydrologic response to these events. Dry Younger Dryas and Heinrich stadials have been reported from various marine and terrestrial archives across the tropical Indian Ocean 4,9-14 .However, a few records suggest wet Younger Dryas or Heinrich stadials over northeast Australia 15 , southern Indonesia 5,16 and southeast Africa 12,17 . Although there seems to be strong evidence that the intertropical convergence zone (ITCZ) moved southwards in the tropical Atlantic 2 , a wide range of mechanisms have been offered to explain the connection between the cooling of the North Atlantic and tropical Indian Ocean hydroclimates: a weakening of the rainfall system in response to regional sea surface cooling 13,14 ; and changes in the monsoon intensity 4,10,16 associated with a southward shift in the mean 1 or winter 4,5,15 position of the ITCZ or in the position of oceanic fronts 18 .How...

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Isotopic signals in two morphotypes of Globigerinoides ruber (white) from the South China Sea: implications for monsoon climate change during the last glacial cycle

Cited by 166 publications

References 25 publications

Core-top calibration of δ18O and δ13C of G. ruber (white) and U. mediterranea along the southern Adriatic coast of Italy

Core-top calibration of δ18O and δ13C of G. ruber (white) and U. mediterranea along the southern Adriatic coast of Italy

Evaluating controls on planktonic foraminiferal geochemistry in the Eastern Tropical North Pacific

North Atlantic forcing of tropical Indian Ocean climate

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