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Saturday, November 21, 2020 | History

2 edition of Scavenging of ²³¹Pa and ²³⁰Th in the South Atlantic found in the catalog.

Scavenging of ²³¹Pa and ²³⁰Th in the South Atlantic

Walter, Hans-JuМ€rgen.

Scavenging of ²³¹Pa and ²³⁰Th in the South Atlantic

implications for the use of the ²³¹Pa/²³⁰Th ratio as a paleoproductivity proxy = Entfernung der natürlichen Radionuklide Protactinium-231 und Thorium-230 aus der Wassersäule des Südatlantiks Auswirkungen für die Verwendung des ²³¹Pa/²³⁰Th-Verhältnisses als Anzeiger für Paläoproduktivität

by Walter, Hans-JuМ€rgen.

  • 237 Want to read
  • 21 Currently reading

Published by Alfred-Wegener-Institut für Polar- und Meeresforschung in Bremerhaven .
Written in English

    Places:
  • Antarctic Ocean.,
  • Antarctic Ocean
    • Subjects:
    • Radioactive tracers in oceanography.,
    • Paleoecology -- Antarctic Ocean.,
    • Marine productivity -- Antarctic Ocean -- Measurement.

    • Edition Notes

      Other titlesEntfernung der natürlichen Radionuklide Protactinium-231 unt Thorium-230 aus der Wassersäule des Südatlantiks Auswirkungen für die Verwendung des ²³¹Pa/²³⁰Th-Verhältnisses als Anzeiger für Paläoproduktivität
      StatementHans-Jürgen Walter.
      SeriesBer. Polarforsch.,, 282, Berichte zur Polarforschung ;, Nr. 282.
      Classifications
      LC ClassificationsGC10.4.R3 W35 1998
      The Physical Object
      Pagination82 p. :
      Number of Pages82
      ID Numbers
      Open LibraryOL495285M
      LC Control Number98228669

      Solving Conversion Problems Conversion factors are used to change a given measurement to some other unit of measure. A conversion factor is a ratio of equivalent measurements. It equals 1. 6. A student is asked to calculate the volume, in milliliters, of 2 cups of oil. There. calculus book. We need the partial derivatives of z: ∂z ∂x = −2x, ∂z ∂y = −2y. The function we need to integrate, is p 1+(−2x) 2+(−2y) = p 1+4(x2 +y2). Then we need to find the domain: since z = 1 − x2 − y2 ≥ 0, we get x2 + y2 ≤ 1. So it looks like it would be best to use polar coordinates. Now we can set up the. View Notes - _ lecture notesChemistry Lecture Notes Fall David E. Henderson 1 Chapter 2 & 3 How do we measure things Chem 8/3/ Chem Fall 2 .


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Scavenging of ²³¹Pa and ²³⁰Th in the South Atlantic by Walter, Hans-JuМ€rgen. Download PDF EPUB FB2

The scavenging of ²³⁰Th, ²³¹Pa and ¹⁰Be was studied in the Pacific sector of the Southern Ocean along °W using measurements from surface sediments, time-series sediment traps, and. Results suggest that net transport southward of ²³⁰Th and ²³¹Pa across GEOVIDE is smaller than transport further south in the Atlantic, and indicates that the flux to sediment in the North.

The sedimentary ²³¹Pa/²³⁰Th ratios are always equal to or greater than the seawater production ratio (), consistent with enhanced biological scavenging in this region. The radionuclides ²³¹Pa and ²³⁰Th, produced in the water column and removed from the ocean by particle scavenging and burial in sediments, offer a means for paleoceanographers to examine.

The strength of Atlantic meridional overturning circulation is believed to affect the climate over glacial-interglacial and millennial timescales. The marine sedimentary ²³¹Pa/²³⁰Th ratio is a promising paleocirculation proxy, but local particle effects may bias individual reconstructions.

Holocene ²³¹Pa/²³⁰Th ratios show a very significant variation by depth, with strong export of ²³¹Pa at deep sites but little or no export at shallow sites, a result which echoes findings for the South Atlantic.

Fleisher's 79 research works with 3, citations and 6, reads, including: A new method to extract Th, Th and Pa from seawater using a bulk-extraction technique with Nobias PA This book is Creative Commons Attribution-NonCommercial-ShareAlike License and you must attribute OpenStax.

Attribution information. If you are redistributing all or part of this book in a print format, then you must include on every physical page the following attribution.

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Start studying Surveying Physical Sciences Exam #2. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Two important questions in the fields of paleoceanography and marine biogeochemistry (the reconstruction of past changes in the strength and geometry of the ocean’s overturning circulation and the quantification of particle flux to the seafloor) are addressed using three isotopes from the U-decay series (²³⁴Th, ²³⁰Th and ²³¹Pa).

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