Accession Number:

AD0757225

Title:

Historical Climatology

Descriptive Note:

Final technical rept. 1 Oct 1971-30 Sep 1972

Corporate Author:

R AND D ASSOCIATES MARINA DEL REY CA

Personal Author(s):

Report Date:

1972-10-01

Pagination or Media Count:

70.0

Abstract:

The research program in Historical Climatology has the general purpose to show feasibility of determining global climate in the past, by determining past trends in surface temperature of the earth. The method being studied involves measuring past temperatures using isotope thermometers in bio-organic bases. For example, isotope ratios in tree rings being formed are expected to change if the temperature changes thus tree rings formed long ago may exhibit different ratios than those being formed today. Lower limits on the temperature coefficients have been computed, and compared favorably with experimental coefficients. New measurements of these coefficients have been undertaken in water plants. Feasibility of measurement of the isotope ratio by neutron activation for oxygen has been demonstrated and feasibility of measurement of DH, C13C12 and O18O16 has been demonstrated by elastic backscatter of low energy protons. The variations of isotope ratios in two trees have been measured and the correlation with historic weather records is being studied. Author

Subject Categories:

  • Meteorology
  • Geology, Geochemistry and Mineralogy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE