Multiple monsoon-controlled breakdown of oxygen-minimum conditions during the past 30,000 years documented in laminated sediments off Pakistan

Rad, Ulrich von; Schulz, Hartmut; Riech, Volkher; Dulk, M. den; Berner, Ulrich; Sirocko, Frank

doi:10.1016/s0031-0182(99)00042-5

Cited by 141 publications

(75 citation statements)

References 56 publications

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“…While sediment input from the many small rivers that drain this region was higher during glacial times than it is today, there is still active fluvial sedimentation on the Makran Margin (von Rad et al, 1999;Prins et al, 2000b). A study of the clay mineralogy of the same core-top sediments used in this study revealed that the accumulation rate of chlorite, the source of which is the Makran Margin, has a maximum in the Gulf of Oman that diminishes southeastward .…”

Section: Sedimentation In the Arabian Seamentioning

confidence: 70%

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Terrigenous plant wax inputs to the Arabian Sea: Implications for the reconstruction of winds associated with the Indian Monsoon

Dahl

Oppo

Eglinton

et al. 2005

Geochimica et Cosmochimica Acta

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We have determined the accumulation rates and carbon isotopic compositions (δ 13 C) of longchain (C 24 -C 32 ) terrigenous plant wax fatty acids in 19 surface sediment samples geographically distributed throughout the Arabian Sea in order to assess the relationship between plant wax inputs and the surrounding monsoon wind systems. Both the accumulation rate data and the δ 13 C data show that there are three primary eolian sources of plant waxes to the Arabian Sea: Africa, Asia, and the Arabian Peninsula. These sources correspond to the three major wind systems in this region: the summer (Southwest) monsoon, the winter (Northeast)

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Section: Sedimentation In the Arabian Seamentioning

confidence: 70%

“…Open squares indicated sediment cores for which Holocene sedimentation is known to be predominantly fluvial von Rad and Tahir, 1997;von Rad et al, 1999;Prins et al, 2000b;Staubwasser and Sirocko, 2001) . Figure 3: Leaf wax n-alkanoic acid (C 24 -C 32 ) accumulation rates.…”

Section: Indus Fanmentioning

confidence: 99%

Terrigenous plant wax inputs to the Arabian Sea: Implications for the reconstruction of winds associated with the Indian Monsoon

Dahl

Oppo

Eglinton

et al. 2005

Geochimica et Cosmochimica Acta

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“…3). This interval is assigned to as Younger Dryas (YD) event that has been reported in sediments of the eastern Arabian Sea (von Rad et al, 1999;Singh et al, 2006;Rao et al, 2008). The presence of Younger Dryas and B-A events similar to that of North Atlantic and Northwestern Arabian Sea (Schulte et al, 1999;von Rad et al, 1999) reflect that the abrupt climatic changes are of global origin suggesting common forcing agents through atmospheric circulation.…”

Section: Climatic and Oceanographic Conditionsmentioning

confidence: 92%

“…This interval is assigned to as Younger Dryas (YD) event that has been reported in sediments of the eastern Arabian Sea (von Rad et al, 1999;Singh et al, 2006;Rao et al, 2008). The presence of Younger Dryas and B-A events similar to that of North Atlantic and Northwestern Arabian Sea (Schulte et al, 1999;von Rad et al, 1999) reflect that the abrupt climatic changes are of global origin suggesting common forcing agents through atmospheric circulation. At the end YD event, δ 18 O values were further reduced during early Holocene and peaked at ~11.5 ka, 9 ka and 7 kaBP with intermittent low values, suggesting major intensification of summer SWM occurred at 11.5 kaBP and synchronous with a major climate transition recorded in Greenland (Sirocko et al, 1993).…”

Section: Climatic and Oceanographic Conditionsmentioning

confidence: 92%

“…For more than two decades, numerous sedimentary records have been investigated from its northwestern and northeastern margins and deep Arabian Sea (Van Campo et al, 1982;Clemens and Prell, 1990;Shimmield et al, 1990;Shimmield and Mowbray 1991;Prell et al, 1992;Sirocko et al, 1996Sirocko et al, , 2000Reichart et al, 1997;Schulz et al, 1998;von Rad et al, 1999;Shenetger et al, 2000). The records reveal the history of upwelling related productivity driven by the monsoons.…”

Section: Introductionmentioning

confidence: 99%

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Paleoclimatic and diagenetic history of the late quaternary sediments in a core from the Southeastern Arabian Sea: Geochemical and magnetic signals

et al. 2010

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The geochemical and rock-magnetic investigations were carried out on a sediment core collected from the SE Arabian Sea at 1420 m depth in oxygenated waters below the present day oxygen minimum zone. The top 250 cm sediments of the core represent the last 35 kaBP. The δ 18O values of Globigerinoides ruber are heaviest during the Last Glacial Maximum (LGM) and appear unaffected by low-saline waters transported from the Bay of Bengal by stronger northeast monsoon and West Indian coastal current. The signatures of Bφlling-Allerφd and Younger Dryas events are distinct in the records of magnetic susceptibility, organic carbon (OC) and δ 18O. Glacial sediments show higher OC, CaCO 3 , Ba, Mo, U and Cd, while the early to late Holocene sediments show increasing concentrations of OC, CaCO 3 , Ba, Cu, Ni and Zn and decreasing concentrations of Mo, U and Cd. Productivity induced lowoxygenated bottom waters and reducing sedimentary conditions during glaciation and, productivity and oxygenated bottom waters in Holocene are responsible for their variation. The core exhibits different stages of diagenesis at different sediment intervals. The occurrence of fine-grained, low-coercivity, ferrimagnetic mineral during glacial period is indicative of its formation in organic-rich, anoxic sediments, that may be analogous to the diagenetic magnetic enhancement known in sapropels of the Mediterranean Sea and Japan Sea. The glacial sediments exhibiting reductive diagenesis with anoxic sedimentary environment in this core correspond to reductive diagenesis and intermittent bioturbation (oxygenation) reported in another core in the vicinity. This suggests that the low-oxygenated bottom water conditions during glacial times should not be generalized, but are influenced locally by productivity, sedimentation rates and sediment reworking.

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Abrupt climate-induced changes in carbonate burial in the Arabian Sea: Causes and consequences

Naidu

Singh

Ganeshram

et al. 2014

Geochem. Geophys. Geosyst.

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We present high-resolution records of aragonite contents and pteropods abundance in two sediment cores within the Oxygen Minimum Zone (OMZ) of the eastern Arabian Sea. We show large increases in aragonite contents during glacial and particularly during stadials (Heinrich Events). Using aragonite content, pteropods abundance, organic carbon percentage, and abundance of fertile (eutrophic) species of planktonic foraminifer, we demonstrate that aragonite contents in the eastern Arabian Sea primarily reflects preservation linked to the deepening of Aragonite Compensation Depth (ACD) in the Arabian Sea. We show that these aragonite preservation events correspond with time equivalents of Heinrich Events when Arabian Sea experienced large declines in monsoon-driven productivity and greater penetration of Antarctica Intermediate Water (AAIW). Thus, pteropod preservation in the Arabian Sea appears to be linked to rapid climate change through atmospheric and oceanic teleconnections. We suggest that the role of aragonite carbonate production and burial in margins and the resultant CO 2 climate feedback to rapid climate changes remains poorly constrained.

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Multiple monsoon-controlled breakdown of oxygen-minimum conditions during the past 30,000 years documented in laminated sediments off Pakistan

Cited by 141 publications

References 56 publications

Terrigenous plant wax inputs to the Arabian Sea: Implications for the reconstruction of winds associated with the Indian Monsoon

Terrigenous plant wax inputs to the Arabian Sea: Implications for the reconstruction of winds associated with the Indian Monsoon

Paleoclimatic and diagenetic history of the late quaternary sediments in a core from the Southeastern Arabian Sea: Geochemical and magnetic signals

Abrupt climate-induced changes in carbonate burial in the Arabian Sea: Causes and consequences

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