L18_Paleoclimate-Recent-Time

Waterisotopesorg gabe bowen purdue university 10 0

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: chemical behavior, but because they have different masses, they par=cipate in reac=ons at different rates. Isotope “delta” ( δ ) values: A measure of the amount of rare isotope (e.g., 18O) rela=ve to an interna=onal reference standard. - 20 ‰ 0 ‰ +20 ‰ δ18O (SMOW) 20 parts per thousand more 18O than the interna=onal reference water, SMOW (standard mean ocean water) Isotope “delta” ( δ ) values: A measure of the amount of rare isotope (e.g., 18O) rela=ve to an interna=onal reference standard. - 20 ‰ 0 ‰ +20 ‰ δ18O (SMOW) δ18O = [(Rsa / Rst) – 1]*1000 Where Rsa = 18O/16O ra=o of sample Rst = 18O/16O ra=o of standard 20 parts per thousand more 18O than the interna=onal reference water, SMOW (standard mean ocean water) Isotope Map (“Isoscape”) of Global Precipita=on Low δ18O High δ18O - 30 - 20 www.waterisotopes.org (Gabe Bowen, Purdue University) - 10 0 Isotopes in rain and snow 0 δ18O (‰ vs. SMOW) Temperature Effect General Rule: δ18O, δD values decrease with decreasing temperature Rela=ons: δ18O = 0.695*T –...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern