Joint Application of Concentration and δ18O to Investigate the Global Atmospheric CO Budget

Atmosphere

Keyhong Park²  Louisa K. Emmons¹  Zhihui Wang²  John E. Mak² 

[1] Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, CO 80301, USA; E-Mail:;Institute for Terrestrial and Planetary Atmospheres, School of Marine and Atmospheric Sciences, State University of New York at Stony Brook, Stony Brook, NY 11794, USA; E-Mails:

关键词: carbon monoxide;    inverse modeling;    isotope;    global CO budget;   

DOI  :  10.3390/atmos6050547

来源: mdpi

【 摘 要 】

Most previous top-down global carbon monoxide (CO) budget estimates have used only concentration information and shown large differences in individual source estimates. Since CO from certain sources has a specific isotopic signature, coupling the concentration and isotope fraction information can provide a better constraint on CO source strength estimates. We simulate both CO concentration and its oxygen isotopologue C¹⁸O in the 3-D global chemical transport model MOZART-4 and compare the results with observations. We then used a Bayesian inversion to calculate the most probable global CO budget. In the analysis, δ¹⁸O information is jointly applied with concentration. The joint inversion results should provide more accurate and precise inversion results in comparison with CO-only inversion. Various methods combining the concentration and isotope ratios were tested to maximize the benefit of including isotope information. The joint inversion of CO and δ¹⁸O estimated total global CO production at 2951 Tg-CO/yr in 1997, 3084 Tg-CO/yr in 1998, and 2583 Tg-CO/yr in 2004. The updated CO budget improved both the modeled CO and δ¹⁸O. The clear improvement shown in the δ¹⁸O implies that more accurate source strengths are estimated. Thus, we confirmed that the observation of CO isotopes provide further substantial information for estimating a global CO budget.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.