不同ENSO位相热带中东太平洋与低纬度大气的信息传输不对称性研究

发布时间：2019-05-09 16:00

【摘要】：基于传递熵和再分析数据,讨论了不同ENSO位相下热带中东太平洋与其上空大气的信息传输,研究结果表明:厄尔尼诺、拉尼娜及中性状态下均是以海洋输出信息、大气输入信息为主导的特征,且海洋和大气输入和输出信息的空间分布型较类似。相对中性状态而言,厄尔尼诺和拉尼娜状态下,海洋和大气输入和输出的信息均较强;拉尼娜状态相比厄尔尼诺状态,海洋与大气输入和输出的信息要稍强。通过重排滑动随机抽样方法分析了热带中东太平洋与其上空大气信息传输强度与海温异常的关系,重点分析了热带中东太平洋与其上空大气信息传输的不对称性。揭示了海洋对大气的信息传输随海温距平的变化可以分为类拉尼娜、类中性状态及类厄尔尼诺3个阶段:类拉尼娜阶段,随着低海温的减弱信息传输逐渐减弱;类中性状态,低海温向高海温的过渡过程,信息传输并不存在显著的变化趋势;类厄尔尼诺,随着高海温的增强信息传输逐渐增强。热带中东太平洋与其上空大气信息传输的不对称性更表现为类拉尼娜和类厄尔尼诺阶段信息传输与海温异常之间建立线性关系的阈值和线性趋势程度的不对称。此外,大气对海洋的信息传输随海温的变化与海洋对大气的信息传输随海温的变化类似,即海洋对大气信息传输较强时,大气对海洋的信息传输同样较强,反之亦然,并且大气对海洋的信息传输随海温的变化同样存在不对称性。
[Abstract]:Based on the transfer entropy and reanalysis data, the information transmission in the tropical Middle East Pacific Ocean and its atmosphere under different ENSO phases is discussed. the results show that the information is output by ocean in El Ni 帽 o, La Nina and neutral states. Atmospheric input information is the dominant feature, and the spatial distribution pattern of ocean and atmospheric input and output information is similar. Compared with the neutral state, the input and output information of the ocean and the atmosphere is stronger in the El Ni 帽 o and La Nina states, and the input and output information of the ocean and the atmosphere is slightly stronger in the La Nina state than in the El Ni 帽 o state. The relationship between atmospheric information transmission intensity and SST anomaly over tropical Middle East Pacific Ocean and its sky is analyzed by rearrangement sliding random sampling method, with emphasis on the asymmetry of atmospheric information transmission over tropical Middle East Pacific Ocean and its sky. It is revealed that the change of ocean-to-atmosphere information transmission with SST anomaly can be divided into three stages: quasi-La Nina-like, quasi-neutral state and El-Nino-like stage: la Nina-like stage, with the weakening of low sea surface temperature information transmission gradually weakened; In the quasi-neutral state, there is no significant change trend in the transition process from low SST to high SST, and El Nino-like information transmission increases gradually with the enhancement of SST. The asymmetry of atmospheric information transmission in the tropical Middle East Pacific Ocean and over it is the asymmetry of the threshold and the degree of linear trend between the information transmission in the quasi-La Nina and El Ni 帽 o-like stages and the SST anomaly. In addition, the change of atmospheric-to-ocean information transmission with SST is similar to that of ocean-to-atmospheric information transmission with SST, that is, when the ocean-to-atmosphere information transmission is strong, the atmospheric-to-ocean information transmission is equally strong, and vice versa. Moreover, there is also asymmetry in the information transmission from the atmosphere to the ocean with the change of SST.
【作者单位】：国家气象信息中心;中国气象局气候研究开放实验室;兰州大学大气科学学院;
【基金】：国家重点基础研究发展计划(2012CB955203) 国家自然科学基金(41205040、41105055、41305059) 公益性行业(气象)科研专项(GYHY201306021)
【分类号】：P732

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