Empirical prediction of the onset dates of South China Sea summer monsoon

Empirical prediction of the onset dates of South China Sea summer monsoon
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南海夏季风爆发日期的实证预测

DOI:
10.1007/s00382-016-3164-x
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发表时间:
2017-03
期刊:
影响因子:
4.6
通讯作者:
李天明
李天明
中科院分区:
地球科学2区
文献类型:
--
作者:
朱志伟;李天明

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南海夏季风的爆发标志着东亚雨季的开始。预测SCSSM发作日期具有重要意义。在本研究中,我们建立了两个不同的统计模型,即物理经验模型(PEM)和时空投影模型(STPM)来预测SCSSM的发病。PEM是从季节预测的角度构建的。观测诊断表明,南海夏季风的早期爆发是在对流层中低层有增暖趋势的情况下发生的(B)3月热带太平洋上一个类似拉尼娜的纬向偶极子海表温度型,1月份副热带为负中心,南半球高纬为正中心的偶极子型海平面气压场。建立在这些预测因子上的PEM实现了1979-2004年期间0.84的交叉验证再预测时间相关系数(TCC)技能,以及2005-2014年期间0.72的独立预测TCC技能。STPM是建立在扩展范围预测的角度。本文用五分资料预报了南海地区的纬向风指数。与PEM类似,STPM是使用1979-2004年的数据构建的。基于预测的纬向风指数,SCSSM爆发日期的独立预测达到了0.90的TCC技能为2005-2014年。STPM为南海夏季风爆发期间(第25-35候)的季节内演变提供了更详细的信息。本文提出的两个模型有望促进SCSSM发作的实时预测。
The onset of South China Sea summer monsoon (SCSSM) signifies the commencement of the wet season over East Asia. Predicting the SCSSM onset date is of significant importance. In this study, we establish two different statistical models, namely the physical–empirical model (PEM) and the spatial–temporal projection model (STPM) to predict the SCSSM onset. The PEM is constructed from the seasonal prediction perspective. Observational diagnoses reveal that the early onset of the SCSSM is preceded by (a) a warming tendency in middle and lower troposphere (850–500 hPa) over central Siberia from January to March, (b) a La Niña-like zonal dipole sea surface temperature pattern over the tropical Pacific in March, and (c) a dipole sea level pressure pattern with negative center in subtropics and positive center over high latitude of Southern Hemisphere in January. The PEM built on these predictors achieves a cross-validated reforecast temporal correlation coefficient (TCC) skill of 0.84 for the period of 1979–2004, and an independent forecast TCC skill of 0.72 for the period 2005–2014. The STPM is built on the extended-range forecast perspective. Pentad data are used to predict a zonal wind index over the South China Sea region. Similar to PEM, the STPM is constructed using 1979–2004 data. Based on the forecasted zonal wind index, the independent forecast of the SCSSM onset dates achieves a TCC skill of 0.90 for 2005–2014. The STPM provides more detailed information for the intraseasonal evolution during the period of the SCSSM onset (pentad 25–35). The two models proposed herein are expected to facilitate the real-time prediction of the SCSSM onset.
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影响因子: 4.6
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