In:
Proceedings of the National Academy of Sciences, Proceedings of the National Academy of Sciences, Vol. 107, No. 45 ( 2010-11-09), p. 19171-19175
Abstract:
Carbon dioxide (CO 2 ) is the most important anthropogenic greenhouse gas in the present-day climate. Most of the community focuses on its long-term (decadal to centennial) behaviors that are relevant to climate change, but there are relatively few discussions of its higher-frequency forms of variability, and none regarding its subseasonal distribution. In this work, we report a large-scale intraseasonal variation in the Atmospheric Infrared Sounder CO 2 data in the global tropical region associated with the Madden–Julian oscillation (MJO). The peak-to-peak amplitude of the composite MJO modulation is ∼1 ppmv, with a standard error of the composite mean 〈 0.1 ppmv. The correlation structure between CO 2 and rainfall and vertical velocity indicate positive (negative) anomalies in CO 2 arise due to upward (downward) large-scale vertical motions in the lower troposphere associated with the MJO. These findings can help elucidate how faster processes can organize, transport, and mix CO 2 and provide a robustness test for coupled carbon–climate models.
Type of Medium:
Online Resource
ISSN:
0027-8424
,
1091-6490
DOI:
10.1073/pnas.1008222107
Language:
English
Publisher:
Proceedings of the National Academy of Sciences
Publication Date:
2010
detail.hit.zdb_id:
209104-5
detail.hit.zdb_id:
1461794-8
SSG:
11
SSG:
12
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