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Interdecadal variability of intensity of the Madden–Julian oscillation
Atmospheric Science Letters ( IF 2.0 ) Pub Date : 2021-01-24 , DOI: 10.1002/asl.1027 Ziyue Wang 1 , Tim Li 1, 2 , Ying Sun 3
Atmospheric Science Letters ( IF 2.0 ) Pub Date : 2021-01-24 , DOI: 10.1002/asl.1027 Ziyue Wang 1 , Tim Li 1, 2 , Ying Sun 3
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The interdecadal variability of intensity of the Madden–Julian oscillation (MJO) during boreal winter was investigated based on two reanalysis datasets (NOAA 20CR and ERA‐20C). Both the reanalysis datasets reveal statistically significant power spectrum peaks at 12–20‐year periods. A composite analysis shows that during the active interdecadal phase, eastward propagating MJO activity was strengthened over the equatorial warm pool expanded from the Indian Ocean (IO) to the western Pacific (WP). The cause of the enhanced MJO variability was attributed to the interdecadal change of background mean precipitation in situ. A further diagnosis shows that the increase of the background precipitation over the Maritime Continent and the WP was attributed to interdecadal warm sea surface temperature (SST) anomalies in situ, whereas the increase of the precipitation over the IO resulted from the local convective instability due to the increase of wind induced surface evaporation and moisture. The strengthened background precipitation impacted the MJO strength through the increase of the interdecadal background moisture in the lower and middle troposphere induced by anomalous vertical moisture advection.
中文翻译：
Madden-Julian振荡强度的年代际变化
基于两个重新分析数据集（NOAA 20CR和ERA-20C），研究了寒冬期间Madden-Julian振荡（MJO）强度的年代际变化。这两个重新分析的数据集都显示出在12至20年期间具有统计学意义的功率谱峰值。综合分析表明，在活跃的年代际阶段，从印度洋（IO）扩展到西太平洋（WP）的赤道暖池向东传播的MJO活动得到加强。MJO变异性增强的原因归因于背景平均降水量的年代际变化。进一步的诊断表明，海陆和WP的本底降水增加是由于原位年代际暖海表面温度（SST）异常所致，而由于IO引起的降水增加是由于风引起的表面蒸发和水分增加引起的局部对流不稳定性所致。背景降水的加强通过异常垂直水分对流引起的对流层中低层年代际背景水分的增加影响了MJO强度。
更新日期：2021-01-24
中文翻译：
Madden-Julian振荡强度的年代际变化
基于两个重新分析数据集（NOAA 20CR和ERA-20C），研究了寒冬期间Madden-Julian振荡（MJO）强度的年代际变化。这两个重新分析的数据集都显示出在12至20年期间具有统计学意义的功率谱峰值。综合分析表明，在活跃的年代际阶段，从印度洋（IO）扩展到西太平洋（WP）的赤道暖池向东传播的MJO活动得到加强。MJO变异性增强的原因归因于背景平均降水量的年代际变化。进一步的诊断表明，海陆和WP的本底降水增加是由于原位年代际暖海表面温度（SST）异常所致，而由于IO引起的降水增加是由于风引起的表面蒸发和水分增加引起的局部对流不稳定性所致。背景降水的加强通过异常垂直水分对流引起的对流层中低层年代际背景水分的增加影响了MJO强度。
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