Factors controlling the interannual variations of MJO intensity

Factors controlling the interannual variations of MJO intensity
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MJO强度年际变化的控制因素

DOI:
10.1007/s13351-016-5113-3
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发表时间:
2016-03
影响因子:
3.2
通讯作者:
Peng Melinda
Peng Melinda
中科院分区:
地球科学3区
文献类型:
--
作者:
Deng Li;Li Tim;Liu Jia;Peng Melinda

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利用观测到的出射长波辐射(OLR)和ECMWF、NCEP再分析资料,研究了北半球冬季麦登-朱利安振荡(MJO)强度的年际变化。用20-80天滤波OLR距平的标准差来度量MJO强度。通过对MJO强度场的分析,揭示了MJO年际变化的主要空间结构。结果表明,第一模态与东太平洋型ENSO有关,第二模态与中太平洋型ENSO有关。一个简单的大气模式被用来调查的背景水分和风的变化在影响MJO的整体强度的相对作用。数值试验表明,背景湿度的影响占主导地位,而背景风变化的影响较小。
The interannual variations of intensity of the Madden-Julian Oscillation (MJO) during boreal winter are investigated by using the observed outgoing longwave radiation (OLR) and the reanalysis data of ECMWF and NCEP. The standard deviation of 20-80-day filtered OLR anomaly is used to measure the MJO intensity. The dominant spatial structure of the interannual variability is revealed by an EOF analysis of the MJO intensity field. It is found that the leading mode is associated with eastern Pacific type ENSO, whereas the second mode is related to central Pacific type ENSO. A simple atmospheric model is used to investigate the relative roles of background moisture and wind changes in affecting the overall strength of MJO. The numerical experiments indicate that the background moisture effect is dominant while the background wind change has a minor effect.
DOI: --
发表时间: 1992
期刊: --
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