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DOI | 10.1175/JCLI-D-19-0010.1 |
On the Sensitivity of Convectively Coupled Equatorial Waves to the Quasi-Biennial Oscillation | |
Abhik, S.; Hendon, Harry H.; Wheeler, Matthew C. | |
2019-09-01 | |
发表期刊 | JOURNAL OF CLIMATE |
ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2019 |
卷号 | 32期号:18页码:5833-5847 |
文章类型 | Article |
语种 | 英语 |
国家 | Australia |
英文摘要 | The seasonal-mean variance of the Madden-Julian oscillation (MJO) in austral summer has recently been shown to be significantly (p < 5%) enhanced during easterly phases of the quasi-biennial oscillation (QBO). The impact is large, with the mean MJO variance increasing by similar to 50% compared to the QBO westerly phase. In contrast, we show using observed outgoing longwave radiation that seasonal variations for convectively coupled equatorial Kelvin, Rossby, and mixed Rossby-gravity waves are insensitive to the QBO. This insensitivity extends to all high-frequency (2-30-day period) and the non-MJO component of the intraseasonal (30-120-day period) convective variance. However, convectively coupled Kelvin wave variability shows a modest increase (similar to 13%) that is marginally significant (p = 10%) during easterly phases of the QBO in austral autumn, when Kelvin wave activity is seasonally strongest along the equator. The mechanism of impact on the Kelvin wave appears to be similar to what has previously been argued for the MJO during austral summer. However, the more tilted and shallower vertical structure of the Kelvin waves suggests that they cannot tap into the extra destabilization at the tropopause provided by the easterly phase of the QBO as effectively as the MJO. Lack of impact on the convectively coupled Rossby and mixed Rossby-gravity waves is argued to stem from their horizontal structure that results in weaker divergent anomalies along the equator, where the QBO impact is greatest. Our results further emphasize that the MJO in austral summer is uniquely affected by the QBO. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000480613800004 |
WOS关键词 | MADDEN-JULIAN OSCILLATION ; VERTICAL STRUCTURE ; TEMPERATURE ; CLOUDS ; NUMBER ; MODES ; LAYER ; QBO |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/186772 |
专题 | 气候变化 |
作者单位 | Bur Meteorol, Melbourne, Vic, Australia |
推荐引用方式 GB/T 7714 | Abhik, S.,Hendon, Harry H.,Wheeler, Matthew C.. On the Sensitivity of Convectively Coupled Equatorial Waves to the Quasi-Biennial Oscillation[J]. JOURNAL OF CLIMATE,2019,32(18):5833-5847. |
APA | Abhik, S.,Hendon, Harry H.,&Wheeler, Matthew C..(2019).On the Sensitivity of Convectively Coupled Equatorial Waves to the Quasi-Biennial Oscillation.JOURNAL OF CLIMATE,32(18),5833-5847. |
MLA | Abhik, S.,et al."On the Sensitivity of Convectively Coupled Equatorial Waves to the Quasi-Biennial Oscillation".JOURNAL OF CLIMATE 32.18(2019):5833-5847. |
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