File:S41598-022-14179-w.pdf
From Wikimedia Commons, the free media repository
Jump to navigation
Jump to search
Size of this JPG preview of this PDF file: 456 × 600 pixels. Other resolutions: 182 × 240 pixels | 365 × 480 pixels | 584 × 768 pixels | 1,239 × 1,629 pixels.
Original file (1,239 × 1,629 pixels, file size: 1.75 MB, MIME type: application/pdf, 9 pages)
File information
Structured data
Captions
Summary[edit]
DescriptionS41598-022-14179-w.pdf |
English: Plutonium (Pu) has been used as a mid-twentieth century time-marker in various geological archives as a result of atmospheric nuclear tests mainly conducted in 1950s. Advancement of analytical techniques allows us to measure 239Pu and 240Pu more accurately and can thereby reconstruct the Pacific Pu signal that originated from the former Pacific Proving Grounds (PPG) in the Marshall Islands. Here, we propose a novel method that couples annual banded reef building corals and nearshore anoxic marine sediments to provide a marker to precisely determine the start of the nuclear era which is known as a part of the Anthropocene. We demonstrate the efficacy of the methods using sediment obtained from Beppu Bay, Japan, and a coral from Ishigaki Island, Japan. The sedimentary records show a clear Pu increase from 1950, peaking during the 1960s, and then showing a sharp decline during the 1970s. However, a constantly higher isotope ratio between 239Pu and 240Pu suggest an additional contribution other than global fallout via ocean currents. Furthermore, single elevations in 240Pu/239Pu provide supportive evidence of close-in-fallout similar to previous studies. Coral skeletal radiocarbon displays a clear timing with the signatures supporting the reliability of the Beppu Bay sediments as archives and demonstrates the strength of this method to capture potential Anthropocene signatures. |
Date | |
Source |
https://www.nature.com/articles/s41598-022-14179-w https://doi.org/10.1038/s41598-022-14179-w |
Author | Yusuke Yokoyama, Stephen Tims, Michaela Froehlich, Shoko Hirabayashi, Takahiro Aze, L. Keith Fifield, Dominik Koll, Yosuke Miyairi, Stefan Pavetich & Michinobu Kuwae |
Licensing[edit]
This file is licensed under the Creative Commons Attribution 4.0 International license.
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 09:38, 8 July 2022 | 1,239 × 1,629, 9 pages (1.75 MB) | Pamputt (talk | contribs) | Uploaded a work by Yusuke Yokoyama, Stephen Tims, Michaela Froehlich, Shoko Hirabayashi, Takahiro Aze, L. Keith Fifield, Dominik Koll, Yosuke Miyairi, Stefan Pavetich & Michinobu Kuwae from https://www.nature.com/articles/s41598-022-14179-w https://doi.org/10.1038/s41598-022-14179-w with UploadWizard |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Publisher | Nature Publishing Group UK |
---|---|
Image title |
|
Short title |
|
Author |
|
Date and time of digitizing | 02:13, 16 June 2022 |
Software used | Springer |
File change date and time | 12:06, 16 June 2022 |
Date metadata was last modified | 12:06, 16 June 2022 |
Identifier | https://doi.org/10.1038/s41598-022-14179-w |
Conversion program | Adobe PDF Library 15.0; modified using iText® 5.3.5 ©2000-2012 1T3XT BVBA (SPRINGER SBM; licensed version) |
Encrypted | no |
Page size | 595.276 x 782.362 pts |
Version of PDF format | 1.6 |
Hidden categories: