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学科主题: Meteorology & Atmospheric Sciences
题名: The NAO, the AO, and global warming: How closely related?
作者: Cohen, J ; Barlow, M
通讯作者: jcohen@aer.com
刊名: JOURNAL OF CLIMATE
发表日期: 2005-01-01
卷: 18, 期:21, 页:4498-4513
收录类别: sci
部门归属: Atmospher & Environm Res Inc, Lexington, MA 02421 USA
摘要: The North Atlantic Oscillation (NAO) and the closely related Arctic Oscillation (AO) strongly affect Northern Hemisphere (NH) surface temperatures with patterns reported similar to the global warming trend. The NAO and AO were in a positive trend for much of the 1970s and 1980s with historic highs in the early 1990s, and it has been suggested that they contributed significantly to the global warming signal. The trends in standard indices of the AO, NAO, and NH average surface temperature for December-February, 1950-2004, and the associated patterns in surface temperature anomalies are examined. Also analyzed are factors previously identified as relating to the NAO, AO, and their positive trend: North Atlantic sea surface temperatures (SSTs), Indo-Pacific warm pool SSTs, stratospheric circulation, and Eurasian snow cover. Recently, the NAO and AO indices have been decreasing; when these data are included, the overall trends for the past 30 years are weak to nonexistent and are strongly dependent on the choice of start and end date. In clear distinction, the wintertime hemispheric warming trend has been vigorous and consistent throughout the entire period. When considered for the whole hemisphere, the NAO/AO patterns can also be distinguished from the trend pattern. Thus the December-February warming trend may be distinguished from the AO and NAO in terms of the strength, consistency, and pattern of the trend. These results are insensitive to choice of index or dataset. While the NAO and AO may contribute to hemispheric and regional warming for multiyear periods, these differences suggest that the large-scale features of the global warming trend over the last 30 years are unrelated to the AO and NAO. The related factors may also be clearly distinguished, with warm pool SSTs linked to the warming trend, while the others are linked to the NAO and AO.
原文出处: 查看原文
内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/8471
Appears in Collections:海洋科技动态信息-印太暖池系统研究_期刊论文

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Cohen, J; Barlow, M.The NAO, the AO, and global warming: How closely related?,JOURNAL OF CLIMATE,2005,18(21):4498-4513
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