• Login
    About WHOAS
    View Item 
    •   WHOAS Home
    • Woods Hole Oceanographic Institution
    • Academic Programs
    • WHOI Theses
    • View Item
    •   WHOAS Home
    • Woods Hole Oceanographic Institution
    • Academic Programs
    • WHOI Theses
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of WHOASCommunities & CollectionsBy Issue DateAuthorsTitlesKeywordsThis CollectionBy Issue DateAuthorsTitlesKeywords

    My Account

    LoginRegister

    Statistics

    View Usage Statistics

    Reconstructing atmospheric changes in Monsoon regions using eolian dust

    Thumbnail
    View/Open
    Kinsley_Thesis (4.435Mb)
    Date
    2019-09
    Author
    Kinsley, Christopher W.  Concept link
    Metadata
    Show full item record
    Citable URI
    https://hdl.handle.net/1912/24554
    DOI
    10.1575/1912/24554
    Keyword
     Minerals; Sediment transport; Atmospheric circulation; Monsoons; Marine geophysics 
    Abstract
    Mineral dust is generated in continental interiors and exported by winds to ocean basins, providing a sedimentary archive which is one of the few direct indicators we have of atmospheric circulation in the past. This archive can be utilized in regions of dust transport also affected by monsoons to examine how different climate forcing mechanisms impact the monsoon regions over glacialinterglacial, orbital, and millennial timescales. This thesis generates new eolian dust records from two monsoon regions to reconstruct changes in atmospheric circulation in response to forcing by high-latitude insolation and boundary condition change. In Chapters 2 and 3 I use 230Thxsnormalization to construct high-resolution eolian dust flux records from sedimentary archives downwind from the West African and East Asian Monsoon regions respectively. The West African margin dust records show variability associated with an interplay between Northern Hemisphere summer insolation forcing and North Atlantic cooling. The longest record at ODP Site 658, stretching back to 67 ka, shows evidence for a “Green Sahara” interval from 60-50 ka and a skipped precessional “beat” from 35-20 ka. This record also shows evidence for abrupt increases in dust flux associated with Greenland stadials. The Shatsky Rise record at ODP Site 1208, downwind of East Asian dust sources, shows variability associated with glacial-interglacial boundary conditions over the last 330 ka, exhibiting high dust during glacial times. The record also exhibits variability associated with a Northern Hemisphere summer insolation control at times overriding the glacialinterglacial signal. In Chapter 4 I demonstrate the feasibility of using radiogenic neodymium isotopes (143Nd/144Nd) at IODP Site U1430 in the Sea of Japan to fingerprint the provenance of eolian material at the core site from Asian dust sources. I then generate a 143Nd/144Nd record from isolated eolian material over the last 200 ka to examine Westerly Jet behavior in the Asian interior, which shows resolvable orbital-scale variability from 200 to 100 ka, and muted variability from 100 to 0 ka. The findings imply a quicker shift of the Westerly Jet to the north of the Tibetan Plateau during times of high Northern Hemisphere summer insolation and a strong Asian monsoon.
    Description
    Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Geochemistry at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution September 2019.
    Collections
    • Geology and Geophysics (G&G)
    • WHOI Theses
    Suggested Citation
    Thesis: Kinsley, Christopher W., "Reconstructing atmospheric changes in Monsoon regions using eolian dust", 2019-09, DOI:10.1575/1912/24554, https://hdl.handle.net/1912/24554
     

    Related items

    Showing items related by title, author, creator and subject.

    • Thumbnail

      The upper ocean response to the monsoon in the Arabian Sea 

      Fischer, Albert S. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2000-09)
      Estimation of the upper ocean heat budget from one year of observations at a moored array in the north central Arabian Sea shows a rough balance between the horizontal advection and time change in heat when the one-dimensional ...
    • Thumbnail

      Arabian Sea mixed layer deepening during the monsoon : observations and dynamics 

      Fischer, Albert S. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1997-09)
      The unusual twice-yearly cycle of mixed layer deepening and cooling driven by the monsoon is analyzed using a recently collected (1994-95) dataset of concurrent local air-sea fluxes and upper ocean dynamics from the ...
    • Thumbnail

      Bay of Bengal intraseasonal oscillations and the 2018 monsoon onset 

      Shroyer, Emily L.; Tandon, Amit; Sengupta, Debasis; Fernando, Harindra J. S.; Lucas, Andrew J.; Farrar, J. Thomas; Chattopadhyay, Rajib; de Szoeke, Simon P.; Flatau, Maria; Rydbeck, Adam; Wijesekera, Hemantha W.; McPhaden, Michael J.; Seo, Hyodae; Subramanian, Aneesh C.; Venkatesan, Ramasamy; Joseph, Jossia K.; Ramsundaram, S.; Gordon, Arnold L.; Bohman, Shannon M.; Pérez, Jaynise; Simoes-Sousa, Iury T.; Jayne, Steven R.; Todd, Robert E.; Bhat, G. S.; Lankhorst, Matthias; Schlosser, Tamara L.; Adams, Katherine; Jinadasa, S. U. P.; Mathur, Manikandan; Mohapatra, Mrutyunjay; Rama Rao, E. Pattabhi; Sahai, Atul Kumar; Sharma, Rashmi; Lee, Craig; Rainville, Luc; Cherian, Deepak A.; Cullen, Kerstin; Centurioni, Luca R.; Hormann, Verena; MacKinnon, Jennifer A.; Send, Uwe; Anutaliya, Arachaporn; Waterhouse, Amy F.; Black, Garrett S.; Dehart, Jeremy A.; Woods, Kaitlyn M.; Creegan, Edward; Levy, Gad; Kantha, Lakshmi; Subrahmanyam, Bulusu (American Meteorological Society, 2021-10-01)
      In the Bay of Bengal, the warm, dry boreal spring concludes with the onset of the summer monsoon and accompanying southwesterly winds, heavy rains, and variable air–sea fluxes. Here, we summarize the 2018 monsoon onset ...
    All Items in WHOAS are protected by original copyright, with all rights reserved, unless otherwise indicated. WHOAS also supports the use of the Creative Commons licenses for original content.
    A service of the MBLWHOI Library | About WHOAS
    Contact Us | Send Feedback | Privacy Policy
    Core Trust Logo