Why Were Sea Surface Temperatures so Different in the Eastern Equatorial Atlantic in June 2005 and 2006?

Frederic Marin; Guy Caniaux; Bernard Bourles; Herve Giordani; Yves Gouriou; Erica Key

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Why Were Sea Surface Temperatures so Different in the Eastern Equatorial Atlantic in June 2005 and 2006?

机译：为什么在2005年6月和2006年6月的赤道东大西洋海面温度如此不同？

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A comparison of June 2005 and June 2006 sea surface temperatures in the eastern equatorial Atlantic exhibits large variability in the properties of the equatorial cold tongue, with far colder temperatures in 2005 than in 2006. This difference is found to result mainly from a time shift in the development of the cold tongue between the two years. Easterlies were observed to be stronger in the western tropical Atlantic in April-May 2005 than in April-May 2006, and these winds favorably preconditioned oceanic subsurface conditions in the eastern Atlantic. However, it is also shown that a stronger than usual intraseasonal intensification of the southeastern trades was responsible for the rapid and early intense cooling of the sea surface temperatures in mid-May 2005 over a broad region extending from 20°W to the African coast and from 6°S to the equator. This particular event underscores the ability of local intraseasonal wind stress variability in the Gulf of Guinea to initiate the cold tongue season and thus to dramatically impact the SST in the eastern equatorial Atlantic. Such intraseasonal wind intensifications are of potential importance for year-to-year variability in the onset of the African monsoon.

机译：对2005年6月和2006年6月赤道东大西洋海表温度的比较显示，赤道冷舌的特性存在较大的差异，2005年的温度比2006年的温度低得多。发现这种差异的主要原因是两年之间的冷舌发展。与2005年4月至5月相比，2005年4月至5月在热带西大西洋上观测到的东风要强一些，这些风有利于对东大西洋的海洋地下条件进行预处理。但是，也表明，东南贸易的季节内集约化强度比往常强，这导致了从20°W到非洲海岸和大洋洲的大范围区域的海面温度在2005年5月中旬迅速和早期急剧降温。从6°S到赤道。这一特殊事件强调了几内亚湾局部季节内风应力变化的能力，从而启动了冷舌季节，从而极大地影响了赤道东大西洋的海温。这种季节内风的增强对于非洲季风爆发中的逐年变化具有潜在的重要性。

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来源
《Journal of Physical Oceanography》 |2009年第6期|1416-1431|共16页
作者
Frederic Marin; Guy Caniaux; Bernard Bourles; Herve Giordani; Yves Gouriou; Erica Key;
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作者单位

Universite de Toulouse, UPS (OMP-PCA), LEGOS, Toulouse, France IRD, LEGOS, 14 Ave. Edouard Belin, Toulouse F-31400, France;

Centre National de Recherches Me'te'orologiques/GAME (Me'te'o-France, CNRS) Toulouse, France;

Universite de Toulouse, UPS (OMP-PCA), LEGOS, Toulouse, France IRD, LEGOS, Cotonou, Benin;

Centre National de Recherches Me'te'orologiques/GAME (Me'te'o-France, CNRS) Toulouse, France;

IRD-Unite'de Service 191, Centre 1RD de Bretagne, Brest, France;

Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, Florida;

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Why Were Sea Surface Temperatures so Different in the Eastern Equatorial Atlantic in June 2005 and 2006?

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