Influence of Droughts on Mid-Tropospheric CO2

Remote Sensing

卷:9

Abigail Corbett¹  Angela Kao¹  Xun Jiang¹  Liming Li²  Yuk Yung³  Albert Zhai³  Sally Newman³  Thomas Pagano⁴  Edward Olsen⁴ 

[1] Department of Earth & Atmospheric Sciences, University of Houston, Houston, TX 77004, USA;

[2] Department of Physics, University of Houston, Houston, TX 77004, USA;

[3] Division of Geological and Planetary Sciences, California Institute of Technology, 1200 E California Blvd, Pasadena, CA 91125, USA;

[4] Science Division, Jet Propulsion Laboratory, California Institute of Technology, 1200 E California Blvd, Pasadena, CA 91125, USA;

关键词: drought;    Carbon Dioxide;    carbon cycle;   

DOI  :  10.3390/rs9080852

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown