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Descripción

We conducted a multidisciplinary study to provide the stratigraphic and palaeoclimatic context of monsoonal rainfall dynamics and their responses to orbital forcing for the Bay of Bengal. Using sediment lightness we established an age model at orbital resolution for International Ocean Discovery Programme (IODP) Core U1452C-1H that covers the last 200 ka in the lower Bengal Fan. The low-resolution δ18O of G. sacculifer is consistent with global δ18O records, at least for major glacial-to-interglacial transitions. The variability of total organic carbon, total nitrogen, and the δ13C composition of organic matter indicate the marine origin of organic matter. Marine primary productivity likely increased during insolation minima, indicative for an enhanced NE monsoon during glacials and stadials. Pristine insolation forcing is also documented for wet-bulk density, red-green color variability, and grain-size variations, indicating that darker and coarser-grained material deposited at higher sedimentation rates during insolation minima. Stronger NE monsoon likely amplified ocean-atmosphere interactions over the Indian Ocean, leading to stronger upwelling through shoaling the thermocline, and higher delivery of sediment to the Bay of Bengal due to higher soil erosion on land. In addition, lower glacial and stadial sea levels as well as stronger westward surface circulation favored delivery of coarser-grained fluvial material to the lower Bengal Fan. At the same time the stronger NE monsoon might have increased the aeolian supply. Total inorganic carbon, the Ca/Ti ratio, and biogenic silica vary dominantly on obliquity frequencies, suggesting mobilization and transport of lithogenic material primarily during lowered sea levels and/or higher influence of the Northern Hemisphere westerlies on the dust transport from the Tibetan Plateau. The close resemblance of sediment lightness and the climate record of Antarctic ice cores over multiple glacial cycles indicate close relationship between high southern latitude and tropical Asian climate through shifts in position of the Intertropical Convergence Zone. The Bengal Fan monsoonal record shows very clear and strict responses to insolation forcing in the lower part from ~200 ka to the Younger Toba Tuff during Marine Isotope Stage (MIS) 7 – 5, and less distinct response patterns after deposition of the ash during MIS 4 – 2, consistent with low-amplitude changes in insolation.

Pertenece a

PANGAEA - Publishing Network for Geoscientific & Environmental Data  

Autor(es)

Weber, Michael E -  Lantzsch, Hendrik -  Dekens, Petra S -  Das, Supriyo -  Reilly, Brendan T -  Martos, Yasmina M -  Meyer -  Jacob, Carsten -  Agrahari, Sandip -  Ekblad, Alf -  Titschack, Jürgen -  Holmes, Elisabeth -  Wolfgramm, Philipp - 

Id.: 71250161

Idioma: inglés  - 

Versión: 1.0

Estado: Final

Tipo:  application/zip, 12 datasets - 

Palabras clave0.046 µm -  0.05 µm -  0.055 µm -  0.061 µm -  0.067 µm -  0.073 µm -  0.08 µm -  0.088 µm -  0.097 µm -  0.107 µm -  0.117 µm -  0.128 µm -  0.141 µm -  0.155 µm -  0.17 µm -  0.186 µm -  0.204 µm -  0.224 µm -  0.246 µm -  0.271 µm -  0.297 µm -  0.326 µm -  0.358 µm -  0.393 µm -  0.432 µm -  0.473 µm -  0.52 µm -  0.571 µm -  0.627 µm -  0.688 µm -  0.755 µm -  0.829 µm -  0.911 µm -  0.999 µm -  1.097 µm -  1.204 µm -  1.322 µm -  1.451 µm -  1.593 µm -  1.749 µm -  1.919 µm -  10.288 µm -  105.934 µm -  1090.808 µm -  11.293 µm -  116.275 µm -  1197.692 µm -  12.396 µm -  127.659 µm -  13.61 µm -  1314.585 µm -  14.939 µm -  140.149 µm -  1442.922 µm -  153.832 µm -  1584.273 µm -  16.397 µm -  168.868 µm -  1739.115 µm -  18 µm -  185.348 µm -  19.763 µm -  1908.926 µm -  2.107 µm -  2.313 µm -  2.539 µm -  2.787 µm -  203.478 µm -  21.697 µm -  223.406 µm -  23.814 µm -  245.235 µm -  26.142 µm -  269.205 µm -  28.699 µm -  295.53 µm -  3.06 µm -  3.359 µm -  3.687 µm -  31.506 µm -  324.396 µm -  34.587 µm -  354 -  U1452C -  356.113 µm -  37.969 µm -  390.924 µm -  4.048 µm -  4.444 µm -  4.878 µm -  41.68 µm -  429.182 µm -  45.755 µm -  471.139 µm -  5.355 µm -  5.878 µm -  50.23 µm -  517.186 µm -  55.14 µm -  567.782 µm -  6.453 µm -  60.529 µm -  623.273 µm -  66.448 µm -  684.204 µm -  7.084 µm -  7.777 µm -  72.946 µm -  751.133 µm -  8.537 µm -  80.078 µm -  824.554 µm -  87.904 µm -  9.371 µm -  905.117 µm -  96.495 µm -  993.569 µm -  Age -  AGE -  Age model -  b* -  Beckman Coulter Laser diffraction particle size analyzer LS 13 320 -  Bengal Fan -  bSiO2 -  C/N -  Ca/Ti -  Calcium/Titanium ratio -  Carbon, inorganic, total -  Carbon, organic, total -  Carbon/Nitrogen ratio -  CDRILL -  Color, b* -  Color, L*, lightness -  Color 400 -  Color 402 -  Color 404 -  Color 406 -  Color 408 -  Color 410 -  Color 412 -  Color 414 -  Color 416 -  Color 418 -  Color 420 -  Color 422 -  Color 424 -  Color 426 -  Color 428 -  Color 430 -  Color 432 -  Color 434 -  Color 436 -  Color 438 -  Color 440 -  Color 442 -  Color 444 -  Color 446 -  Color 448 -  Color 450 -  Color 452 -  Color 454 -  Color 456 -  Color 458 -  Color 460 -  Color 462 -  Color 464 -  Color 466 -  Color 468 -  Color 470 -  Color 472 -  Color 474 -  Color 476 -  Color 478 -  Color 480 -  Color 482 -  Color 484 -  Color 486 -  Color 488 -  Color 490 -  Color 492 -  Color 494 -  Color 496 -  Color 498 -  Color 500 -  Color 502 -  Color 504 -  Color 506 -  Color 508 -  Color 510 -  Color 512 -  Color 514 -  Color 516 -  Color 518 -  Color 520 -  Color 522 -  Color 524 -  Color 526 -  Color 528 -  Color 530 -  Color 532 -  Color 534 -  Color 536 -  Color 538 -  Color 540 -  Color 542 -  Color 544 -  Color 546 -  Color 548 -  Color 550 -  Color 552 -  Color 554 -  Color 556 -  Color 558 -  Color 560 -  Color 562 -  Color 564 -  Color 566 -  Color 568 -  Color 570 -  Color 572 -  Color 574 -  Color 576 -  Color 578 -  Color 580 -  Color 582 -  Color 584 -  Color 586 -  Color 588 -  Color 590 -  Color 592 -  Color 594 -  Color 596 -  Color 598 -  Color 600 -  Color 602 -  Color 604 -  Color 606 -  Color 608 -  Color 610 -  Color 612 -  Color 614 -  Color 616 -  Color 618 -  Color 620 -  Color 622 -  Color 624 -  Color 626 -  Color 628 -  Color 630 -  Color 632 -  Color 634 -  Color 636 -  Color 638 -  Color 640 -  Color 642 -  Color 644 -  Color 646 -  Color 648 -  Color 650 -  Color 652 -  Color 654 -  Color 656 -  Color 658 -  Color 660 -  Color 662 -  Color 664 -  Color 666 -  Color 668 -  Color 670 -  Color 672 -  Color 674 -  Color 676 -  Color 678 -  Color 680 -  Color 682 -  Color 684 -  Color 686 -  Color 688 -  Color 690 -  Color 692 -  Color 694 -  Color 696 -  Color 698 -  Color 700 -  Color 702 -  Color 704 -  Color 706 -  Color 708 -  Color 710 -  Color 712 -  Color 714 -  Color 716 -  Color 718 -  Color 720 -  Color 722 -  Color 724 -  Color 726 -  Color 728 -  Color 730 -  Color 732 -  Color 734 -  Color 736 -  Color 738 -  Color 740 -  Color 742 -  Color 744 -  Color 746 -  Color 748 -  Color 750 -  Color 752 -  Color 754 -  Color 756 -  Color 758 -  Color 760 -  Color 762 -  Color 764 -  Color 766 -  Color 768 -  Color 770 -  Color 772 -  Color 774 -  Color 776 -  Color 778 -  Color 780 -  Color 782 -  Color 784 -  Color 786 -  Color 788 -  Color 790 -  Color 792 -  Color 794 -  Color 796 -  Color 798 -  Color 800 -  Color 802 -  Color 804 -  Color 806 -  Color 808 -  Color 810 -  Color 812 -  Color 814 -  Color 816 -  Color 818 -  Color 820 -  Color 822 -  Color 824 -  Color 826 -  Color 828 -  Color 830 -  Color 832 -  Color 834 -  Color 836 -  Color 838 -  Color 840 -  Color 842 -  Color 844 -  Color 846 -  Color 848 -  Color 850 -  Color reflectance at 400 nm wavelength -  Color reflectance at 402 nm wavelength -  Color reflectance at 404 nm wavelength -  Color reflectance at 406 nm wavelength -  Color reflectance at 408 nm wavelength -  Color reflectance at 410 nm wavelength -  Color reflectance at 412 nm wavelength -  Color reflectance at 414 nm wavelength -  Color reflectance at 416 nm wavelength -  Color reflectance at 418 nm wavelength -  Color reflectance at 420 nm wavelength -  Color reflectance at 422 nm wavelength -  Color reflectance at 424 nm wavelength -  Color reflectance at 426 nm wavelength -  Color reflectance at 428 nm wavelength -  Color reflectance at 430 nm wavelength -  Color reflectance at 432 nm wavelength -  Color reflectance at 434 nm wavelength -  Color reflectance at 436 nm wavelength -  Color reflectance at 438 nm wavelength -  Color reflectance at 440 nm wavelength -  Color reflectance at 442 nm wavelength -  Color reflectance at 444 nm wavelength -  Color reflectance at 446 nm wavelength -  Color reflectance at 448 nm wavelength -  Color reflectance at 450 nm wavelength -  Color reflectance at 452 nm wavelength -  Color reflectance at 454 nm wavelength -  Color reflectance at 456 nm wavelength -  Color reflectance at 458 nm wavelength -  Color reflectance at 460 nm wavelength -  Color reflectance at 462 nm wavelength -  Color reflectance at 464 nm wavelength -  Color reflectance at 466 nm wavelength -  Color reflectance at 468 nm wavelength -  Color reflectance at 470 nm wavelength -  Color reflectance at 472 nm wavelength -  Color reflectance at 474 nm wavelength -  Color reflectance at 476 nm wavelength -  Color reflectance at 478 nm wavelength -  Color reflectance at 480 nm wavelength -  Color reflectance at 482 nm wavelength -  Color reflectance at 484 nm wavelength -  Color reflectance at 486 nm wavelength -  Color reflectance at 488 nm wavelength -  Color reflectance at 490 nm wavelength -  Color reflectance at 492 nm wavelength -  Color reflectance at 494 nm wavelength -  Color reflectance at 496 nm wavelength -  Color reflectance at 498 nm wavelength -  Color reflectance at 500 nm wavelength -  Color reflectance at 502 nm wavelength -  Color reflectance at 504 nm wavelength -  Color reflectance at 506 nm wavelength -  Color reflectance at 508 nm wavelength -  Color reflectance at 510 nm wavelength -  Color reflectance at 512 nm wavelength -  Color reflectance at 514 nm wavelength -  Color reflectance at 516 nm wavelength -  Color reflectance at 518 nm wavelength -  Color reflectance at 520 nm wavelength -  Color reflectance at 522 nm wavelength -  Color reflectance at 524 nm wavelength -  Color reflectance at 526 nm wavelength -  Color reflectance at 528 nm wavelength -  Color reflectance at 530 nm wavelength -  Color reflectance at 532 nm wavelength -  Color reflectance at 534 nm wavelength -  Color reflectance at 536 nm wavelength -  Color reflectance at 538 nm wavelength -  Color reflectance at 540 nm wavelength -  Color reflectance at 542 nm wavelength -  Color reflectance at 544 nm wavelength -  Color reflectance at 546 nm wavelength -  Color reflectance at 548 nm wavelength -  Color reflectance at 550 nm wavelength -  Color reflectance at 552 nm wavelength -  Color reflectance at 554 nm wavelength -  Color reflectance at 556 nm wavelength -  Color reflectance at 558 nm wavelength -  Color reflectance at 560 nm wavelength -  Color reflectance at 562 nm wavelength -  Color reflectance at 564 nm wavelength -  Color reflectance at 566 nm wavelength -  Color reflectance at 568 nm wavelength -  Color reflectance at 570 nm wavelength -  Color reflectance at 572 nm wavelength -  Color reflectance at 574 nm wavelength -  Color reflectance at 576 nm wavelength -  Color reflectance at 578 nm wavelength -  Color reflectance at 580 nm wavelength -  Color reflectance at 582 nm wavelength -  Color reflectance at 584 nm wavelength -  Color reflectance at 586 nm wavelength -  Color reflectance at 588 nm wavelength -  Color reflectance at 590 nm wavelength -  Color reflectance at 592 nm wavelength -  Color reflectance at 594 nm wavelength -  Color reflectance at 596 nm wavelength -  Color reflectance at 598 nm wavelength -  Color reflectance at 600 nm wavelength -  Color reflectance at 602 nm wavelength -  Color reflectance at 604 nm wavelength -  Color reflectance at 606 nm wavelength -  Color reflectance at 608 nm wavelength -  Color reflectance at 610 nm wavelength -  Color reflectance at 612 nm wavelength -  Color reflectance at 614 nm wavelength -  Color reflectance at 616 nm wavelength -  Color reflectance at 618 nm wavelength -  Color reflectance at 620 nm wavelength -  Color reflectance at 622 nm wavelength -  Color reflectance at 624 nm wavelength -  Color reflectance at 626 nm wavelength -  Color reflectance at 628 nm wavelength -  Color reflectance at 630 nm wavelength -  Color reflectance at 632 nm wavelength -  Color reflectance at 634 nm wavelength -  Color reflectance at 636 nm wavelength -  Color reflectance at 638 nm wavelength -  Color reflectance at 640 nm wavelength -  Color reflectance at 642 nm wavelength -  Color reflectance at 644 nm wavelength -  Color reflectance at 646 nm wavelength -  Color reflectance at 648 nm wavelength -  Color reflectance at 650 nm wavelength -  Color reflectance at 652 nm wavelength -  Color reflectance at 654 nm wavelength -  Color reflectance at 656 nm wavelength -  Color reflectance at 658 nm wavelength -  Color reflectance at 660 nm wavelength -  Color reflectance at 662 nm wavelength -  Color reflectance at 664 nm wavelength -  Color reflectance at 666 nm wavelength -  Color reflectance at 668 nm wavelength -  Color reflectance at 670 nm wavelength -  Color reflectance at 672 nm wavelength -  Color reflectance at 674 nm wavelength -  Color reflectance at 676 nm wavelength -  Color reflectance at 678 nm wavelength -  Color reflectance at 680 nm wavelength -  Color reflectance at 682 nm wavelength -  Color reflectance at 684 nm wavelength -  Color reflectance at 686 nm wavelength -  Color reflectance at 688 nm wavelength -  Color reflectance at 690 nm wavelength -  Color reflectance at 692 nm wavelength -  Color reflectance at 694 nm wavelength -  Color reflectance at 696 nm wavelength -  Color reflectance at 698 nm wavelength -  Color reflectance at 700 nm wavelength -  Color reflectance at 702 nm wavelength -  Color reflectance at 704 nm wavelength -  Color reflectance at 706 nm wavelength -  Color reflectance at 708 nm wavelength -  Color reflectance at 710 nm wavelength -  Color reflectance at 712 nm wavelength -  Color reflectance at 714 nm wavelength -  Color reflectance at 716 nm wavelength -  Color reflectance at 718 nm wavelength -  Color reflectance at 720 nm wavelength -  Color reflectance at 722 nm wavelength -  Color reflectance at 724 nm wavelength -  Color reflectance at 726 nm wavelength -  Color reflectance at 728 nm wavelength -  Color reflectance at 730 nm wavelength -  Color reflectance at 732 nm wavelength -  Color reflectance at 734 nm wavelength -  Color reflectance at 736 nm wavelength -  Color reflectance at 738 nm wavelength -  Color reflectance at 740 nm wavelength -  Color reflectance at 742 nm wavelength -  Color reflectance at 744 nm wavelength -  Color reflectance at 746 nm wavelength -  Color reflectance at 748 nm wavelength -  Color reflectance at 750 nm wavelength -  Color reflectance at 752 nm wavelength -  Color reflectance at 754 nm wavelength -  Color reflectance at 756 nm wavelength -  Color reflectance at 758 nm wavelength -  Color reflectance at 760 nm wavelength -  Color reflectance at 762 nm wavelength -  Color reflectance at 764 nm wavelength -  Color reflectance at 766 nm wavelength -  Color reflectance at 768 nm wavelength -  Color reflectance at 770 nm wavelength -  Color reflectance at 772 nm wavelength -  Color reflectance at 774 nm wavelength -  Color reflectance at 776 nm wavelength -  Color reflectance at 778 nm wavelength -  Color reflectance at 780 nm wavelength -  Color reflectance at 782 nm wavelength -  Color reflectance at 784 nm wavelength -  Color reflectance at 786 nm wavelength -  Color reflectance at 788 nm wavelength -  Color reflectance at 790 nm wavelength -  Color reflectance at 792 nm wavelength -  Color reflectance at 794 nm wavelength -  Color reflectance at 796 nm wavelength -  Color reflectance at 798 nm wavelength -  Color reflectance at 800 nm wavelength -  Color reflectance at 802 nm wavelength -  Color reflectance at 804 nm wavelength -  Color reflectance at 806 nm wavelength -  Color reflectance at 808 nm wavelength -  Color reflectance at 810 nm wavelength -  Color reflectance at 812 nm wavelength -  Color reflectance at 814 nm wavelength -  Color reflectance at 816 nm wavelength -  Color reflectance at 818 nm wavelength -  Color reflectance at 820 nm wavelength -  Color reflectance at 822 nm wavelength -  Color reflectance at 824 nm wavelength -  Color reflectance at 826 nm wavelength -  Color reflectance at 828 nm wavelength -  Color reflectance at 830 nm wavelength -  Color reflectance at 832 nm wavelength -  Color reflectance at 834 nm wavelength -  Color reflectance at 836 nm wavelength -  Color reflectance at 838 nm wavelength -  Color reflectance at 840 nm wavelength -  Color reflectance at 842 nm wavelength -  Color reflectance at 844 nm wavelength -  Color reflectance at 846 nm wavelength -  Color reflectance at 848 nm wavelength -  Color reflectance at 850 nm wavelength -  Core drilling -  CSF -  A -  d13C Corg -  delta 13C, organic carbon -  Density, wet bulk -  Depth -  DEPTH, sediment/rock -  Element analyser, Euro EA3024 -  EXP354 -  Fisons Optima isotope ratio mass spectrometer (IRMS) -  Fourier transform infrared spectroscopy (FTIR) -  Fraction -  G. sacculifer d18O -  Globigerinoides sacculifer, d18O -  Grain size, mean -  Grey -  Greyscale value -  Integrated Ocean Drilling Program / International Ocean Discovery Program -  IODP -  Joides Resolution -  L* -  Line Scan Camera -  Mean -  Multi -  Sensor Core Logger -  Nitrogen, total -  Opal, biogenic silica -  Size fraction -  Suscept -  Susceptibility -  TIC -  TN -  TOC -  WBD -  wt% -  X -  ray fluorescence (XRF) - 

Cobertura:  LATITUDE: 8.006810 * LONGITUDE: 87.181860 - 

Tipo de recurso: Dataset  - 

Tipo de Interactividad: Expositivo

Nivel de Interactividad: muy bajo

Audiencia: Estudiante  -  Profesor  -  Autor  - 

Estructura: Atomic

Coste: no

Copyright: sí

: CC-BY: Creative Commons Attribution 3.0 Unported

Formatos:  application/zip, 12 datasets - 

Requerimientos técnicos:  Browser: Any - 

Relación: [IsBasedOn] Supplement to: Weber, Michael E; Lantzsch, Hendrik; Dekens, Petra S; Das, Supriyo; Reilly, Brendan T; Martos, Yasmina M; Meyer-Jacob, Carsten; Agrahari, Sandip; Ekblad, Alf; Titschack, Jürgen; Holmes, Elisabeth; Wolfgramm, Philipp (accepted): 200,000 years of monsoonal history recorded on the lower Bengal Fan - strong response to insolation forcing. Global and Planetary Change

Fecha de contribución: 26-may-2018

Contacto:

Localización:

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