Japan Geoscience Union Meeting 2022

Presentation information

[J] Oral

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS18] Paleoclimatology and paleoceanography

Fri. May 27, 2022 1:45 PM - 3:15 PM 304 (International Conference Hall, Makuhari Messe)

convener:Hitoshi Hasegawa(Faculty of Science and Technology, Kochi University), convener:Yusuke Okazaki(Department of Earth and Planetary Sciences, Graduate School of Science, Kyushu University), Akitomo Yamamoto(Japan Agency for Marine-Earth Science and TechnologyAtmosphere and Ocean Research Institute), convener:Atsuko Yamazaki(Faculty of Science, Kyushu University), Chairperson:Hitoshi Hasegawa(Faculty of Science and Technology, Kochi University)

1:45 PM - 2:00 PM

[MIS18-23] Sensitive analysis of carbon dioxide isotopologues using a tunable mid-infrared laser direct absorption spectroscopy and its implication for paleoclimatology

*Akihiro Kano1, Saburo Sakai2 (1.Graduate School of Science, The University of Tokyo, 2.Japan Agency for Marine-Earth Science and Technology)

Keywords:infrared absorption spectroscopy, isotopologue, carbonate, carbon dioxide

Oxygen and carbon stable isotope ratios of CO2 have contributed to understanding of Earth and planetary systems, especially in field of paleoclimate and paleoceanography. Isotope ratio mass spectrometry (IRMS) is used to measure the stable isotope ratio of carbon dioxide, but recent advances in laser technology enables us to provide a sensitive and accurate measurement by laser spectroscopic technique which is comparable or surpass to IRMS. Here we report a novel method using a tunable mid-infrared laser direct absorption spectroscopy (TILDAS) for measuring the ratios of isotopes from nanomolar CO2. This method is more sensitive than the conventional IRMS currently available. In addition, our TILDAS system is also potential to analyze 17O/16O and carbonate clumped isotopes. Our preliminary results can be a significant mile stone in a number of fields for sensitivity CO2 isotopic analyses, also for application of rare isotopologues. We will also represent some examples for applying paleoclimatology.