Cloud condensation nuclei in the Amazon Basin: “marine” conditions over a continent?
書誌事項
- 公開日
- 2001-07-15
- 権利情報
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- http://onlinelibrary.wiley.com/termsAndConditions#vor
- DOI
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- 10.1029/2000gl012585
- 公開者
- American Geophysical Union (AGU)
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説明
<jats:p>Cloud condensation nuclei (CCN) are linked to radiative forcing, precipitation, and cloud structure; yet, their role in tropical climates remains largely unknown. CCN concentrations (<jats:italic>N<jats:sub>CCN</jats:sub></jats:italic>) measured during the wet season in the Amazon Basin were surprisingly low (mean <jats:italic>N<jats:sub>CCN</jats:sub></jats:italic> at 1% supersaturation: 267±132 cm<jats:sup>−3</jats:sup>) and resembled concentrations more typical of marine locations than most continental sites. At low background CCN concentrations, cloud properties are more sensitive to an increase in <jats:italic>N<jats:sub>CCN</jats:sub></jats:italic>. Therefore, enhanced aerosol emissions due to human activity in the Amazon Basin may have a stronger impact on climate than emissions in other continental regions. In spite of the large organic fraction in the Amazonian aerosol, a detailed analysis of number distributions and size‐dependent chemical composition indicates that sulfate plays an important role in CCN activity.</jats:p>
収録刊行物
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- Geophysical Research Letters
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Geophysical Research Letters 28 (14), 2807-2810, 2001-07-15
American Geophysical Union (AGU)
