Atypical δ13C signature in Globigerina bulloides at the ODP site 723A (Arabian Sea): implications of environmental changes caused by upwelling

Naidu, Pothuri Divakar; Niitsuma, Nobuaki

doi:10.1016/j.marmicro.2004.01.005

Cited by 24 publications

(40 citation statements)

References 25 publications

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“…Only large tests of G. praebulloides were used except for sample PA 2. References: (1) Naidu et al (2004); (2) Mackensen et al (2000); (3) McCorkle et al (1990); (4) Grossman (1987Grossman ( ). 1989Murray 2006;Smart et al 2007).…”

Section: Benthic Foraminifersmentioning

confidence: 99%

Upwelling conditions in the Early Miocene Central Paratethys Sea

Grunert¹,

Soliman²,

Harzhauser³

et al. 2010

Geologica Carpathica

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Evidence for regional upwelling conditions in the Central Paratethys Sea is presented for mid-Burdigalian (early Ottnangian) times. The oceanographic phenomenon is detected in clay-diatomite successions along the steep escarpment of the Bohemian Massif in the eastern North Alpine Foreland Basin. Interpretations are based on a multiproxy data-set including published sedimentological and paleontological data, newly performed stable isotope measurements (δ 18 O, δ 13 C) of foraminifers and bulk sediment samples, and analyses of dinoflagellate cyst assemblages. The revealed stable isotope values of planktonic foraminifers point to upwelling: low δ 13 C values indicate strong mixing of surface waters with rising nutrient-rich waters, high δ18 O values reflect cool sea surface temperatures (SST). Temperature calculations give SSTs ranging from 10-14 °C. Cool SSTs and high productivity are additionally supported by bulk sediment analyses. Assemblages of dinoflagellate cysts indicate a distal-shelf environment with nutrient-rich waters. Westerly winds and tidal currents are discussed as potential driving forces behind the local upwelling event. As midBurdigalian geography favoured strong current patterns in the Central Paratethys as documented in the sedimentary record from the Rhône Basin to Hungary upwelling might have been a more common phenomenon in this epicontinental sea than currently known.

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Section: Benthic Foraminifersmentioning

confidence: 99%

Upwelling conditions in the Early Miocene Central Paratethys Sea

Grunert¹,

Soliman²,

Harzhauser³

et al. 2010

Geologica Carpathica

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“…Based on the studies in the northern Indian Ocean and other world oceans, it has been reported that the stable isotopic composition of G. bulloides reflects the physico-chemical conditions (such as temperature, salinity, eutrophication, depth setting, seasonality, etc.) of the seawater in which it calcifies its test (Naidu & Niitsuma, 2004;Gao et al, 1985;Bemis et al, 2002). Here, we have considered the effect of temperature on δ 18 O of G.…”

Section: Resultsmentioning

confidence: 99%

“…Numerous studies have been carried out in the northern Indian Ocean and also in the Indian Ocean region around Australia, to understand the relationship between various characteristics of foraminifera (unicellular, preferentially marine microorganisms, which are among one of the most extensively used proxies), and seawater physico-chemical properties (Hutson, 1977;Corliss, 1979;Nigam & Khare, 1995;Rathburn & Dedeckker, 1997;Chowdhury et al, 2003;Naidu & Niitsuma, 2004;Ding et al, 2006). However, limited attention has been paid to the southwestern Indian Ocean, although Hutson (1977) studied the effect of water masses and dissolution on the foraminiferal distribution in the western Indian Ocean.…”

Section: Introductionmentioning

confidence: 99%

Oxygen isotope records of Globigerina bulloides across a north-south transect in the south-western Indian Ocean

2009

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Oxygen isotopic analysis of planktic foraminifera (Globigerina bulloides) from a total of 23 surface sediment samples collected along a north-south transect (9.69°N to 55.01°S) in the southwestern Indian Ocean during the Indian Pilot Expedition to Southern Ocean (PESO), was carried out to assess the relationship between oxygen isotopic composition and ambient seawater temperature and salinity. An increasing trend in the δ 18 O value is noticed towards higher latitude.Apparently such an increase in δ 18 O values is inversely related to the seawater temperature changes along the transect. However, slight mismatch is observed at a few stations, which is attributed to significant seawater salinity changes. The preliminary results of the present study, if extended to the subsurface sediments coupled with other parameters, may contribute to the reconstruction of the paleohydrography of the region, especially the position of various seawater fronts during the geologic past, albeit with areal limitation.

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“…The interaction of this geological event with Atlantic circulation and glacioeustatic sea-level changes is becoming better understood (e.g. Pérez-Asensio et al 2012a;Rogerson et al 2012), but little detailed analysis of its consequences for marine nutrient cycling and potential climate feedbacks has previously been undertaken. In the North Atlantic, cessation of the Mediterranean Outflow Water owing to the Messinian closure of the Betic gateways interrupted North Atlantic Deep Water production and weakened the AMOC, leading to cooling in the northern hemisphere (Pérez-Asensio et al 2012a).…”

mentioning

confidence: 99%

“…Pérez-Asensio et al 2012a;Rogerson et al 2012), but little detailed analysis of its consequences for marine nutrient cycling and potential climate feedbacks has previously been undertaken. In the North Atlantic, cessation of the Mediterranean Outflow Water owing to the Messinian closure of the Betic gateways interrupted North Atlantic Deep Water production and weakened the AMOC, leading to cooling in the northern hemisphere (Pérez-Asensio et al 2012a). Coincidently, small-or medium-scale glaciations with limited ice sheets developed in the northern hemisphere at about 7-6 Ma (Fronval & Jansen 1996;Thiede et al 1998).…”

mentioning

confidence: 99%

Messinian productivity changes in the northeastern Atlantic and their relationship to the closure of the Atlantic–Mediterranean gateway: implications for Neogene palaeoclimate and palaeoceanography

Pérez-Asensio

Aguirre

Schmiedl

et al. 2014

JGS

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Abstract:The stable isotope composition of planktic and benthic foraminifera and the distribution of selected benthic foraminiferal species from a Messinian record of the lower Guadalquivir Basin, northeastern Atlantic Ocean, show that regional productivity changes were linked to glacioeustatic fluctuations. Glacial periods were characterized by poorly ventilated bottom waters as a result of weak Atlantic Meridional Overturning Circulation (AMOC), and by phases of high productivity related to intensified upwelling. In contrast, wellventilated bottom waters owing to strong AMOC, the presence of degraded organic matter in the upper slope, and high input of degraded terrestrial organic matter derived from fluvial discharge to the outer shelf were recorded during interglacial periods. Before closure of the adjacent Guadalhorce Corridor at 6.18 Ma, which was the final active Betic Atlantic-Mediterranean gateway, the study area was alternately influenced by wellventilated Mediterranean Outflow Water (MOW) and poorly ventilated Atlantic Upwelled Water (AUW). Following closure of the corridor, cessation of the MOW reduced the AMOC and promoted glacial conditions in the northern hemisphere, resulting in the establishment of local upwelling cells.

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Atypical δ13C signature in Globigerina bulloides at the ODP site 723A (Arabian Sea): implications of environmental changes caused by upwelling

Cited by 24 publications

References 25 publications

Upwelling conditions in the Early Miocene Central Paratethys Sea

Upwelling conditions in the Early Miocene Central Paratethys Sea

Oxygen isotope records of Globigerina bulloides across a north-south transect in the south-western Indian Ocean

Messinian productivity changes in the northeastern Atlantic and their relationship to the closure of the Atlantic–Mediterranean gateway: implications for Neogene palaeoclimate and palaeoceanography

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