期刊
GEOPHYSICAL RESEARCH LETTERS
卷 41, 期 5, 页码 1681-1688出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2013GL059113
关键词
northern annular mode; North Atlantic Oscillation; cloud; cloud radiative forcing; CloudSat; CALIPSO
资金
- CloudSAT via NASA JPL
- NSF Climate Dynamics program
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [1343080] Funding Source: National Science Foundation
The signature of the northern annular mode/North Atlantic Oscillation (NAM/NAO) in the vertical and horizontal distribution of tropospheric cloudiness is investigated in CloudSat and CALIPSO data from June 2006 to April 2011. During the Northern Hemisphere winter, the positive polarity of the NAM/NAO is marked by increases in zonally averaged cloud incidence north of similar to 60 degrees N, decreases between similar to 25 and 50 degrees N, and increases in the subtropics. The tripolar-like anomalies in cloud incidence associated with the NAM/NAO are largest over the North Atlantic Ocean basin/Middle East and are physically consistent with the NAM/NAO-related anomalies in vertical motion. Importantly, the NAM/NAO-related anomalies in tropospheric cloud incidence lead to significant top of atmosphere cloud radiative forcing anomalies that are comparable in amplitude to those associated with the NAM/NAO-related temperature anomalies. The results provide observational evidence that the most prominent pattern of Northern Hemisphere climate variability is significantly linked to variations in cloud radiative forcing. Implications for two-way feedback between extratropical dynamics and cloud radiative forcing are discussed.
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