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Remote Sens. 2017, 9(8), 852;

Influence of Droughts on Mid-Tropospheric CO2

Department of Earth & Atmospheric Sciences, University of Houston, Houston, TX 77004, USA
Science Division, Jet Propulsion Laboratory, California Institute of Technology, 1200 E California Blvd, Pasadena, CA 91125, USA
Division of Geological and Planetary Sciences, California Institute of Technology, 1200 E California Blvd, Pasadena, CA 91125, USA
La Cañada High School, La Cañada Flintridge, Los Angeles, CA 91011, USA
Department of Physics, University of Houston, Houston, TX 77004, USA
Author to whom correspondence should be addressed.
Received: 16 June 2017 / Revised: 13 August 2017 / Accepted: 15 August 2017 / Published: 17 August 2017
(This article belongs to the Special Issue Remote Sensing of Greenhouse Gases)
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Using CO2 data from the Atmospheric Infrared Sounder (AIRS), it is found for the first time that the mid-tropospheric CO2 concentration is ~1 part per million by volume higher during dry years than wet years over the southwestern USA from June to September. The mid-tropospheric CO2 differences between dry and wet years are related to circulation and CO2 surface fluxes. During drought conditions, vertical pressure velocity from NCEP2 suggests that there is more rising air over most regions, which can help bring high surface concentrations of CO2 to the mid-troposphere. In addition to the circulation, there is more CO2 emitted from the biosphere to the atmosphere during droughts in some regions, which can contribute to higher concentrations of CO2 in the atmosphere. Results obtained from this study demonstrate the significant impact of droughts on atmospheric CO2 and therefore on a feedback cycle contributing to greenhouse gas warming. It can also help us better understand atmospheric CO2, which plays a critical role in our climate system. View Full-Text
Keywords: drought; Carbon Dioxide; carbon cycle drought; Carbon Dioxide; carbon cycle

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Jiang, X.; Kao, A.; Corbett, A.; Olsen, E.; Pagano, T.; Zhai, A.; Newman, S.; Li, L.; Yung, Y. Influence of Droughts on Mid-Tropospheric CO2. Remote Sens. 2017, 9, 852.

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