LIANG Jian,REN Hongli,CHEN Quanliang.Diagnosing Effect of Total Solar Irradiance on the Decadal Variability of SST over the Tropical Central Pacific[J].Journal of Chengdu University of Information Technology,2019,(05):525-531.[doi:10.16836/j.cnki.jcuit.2019.05.014]
太阳总辐照度对热带中太平洋海表温度年代际变化的可能影响
- Title:
- Diagnosing Effect of Total Solar Irradiance on the Decadal Variability of SST over the Tropical Central Pacific
- 文章编号:
- 2096-1618(2019)05-0525-07
- Keywords:
- meteorology; climate dynamics; solar radiation; decadal variability; tropical centralPacific; SST; TSI
- 分类号:
- P461+.1
- 文献标志码:
- A
- 摘要:
- 为研究分析热带太平洋海表温度(SST)年代际变化对太阳辐射响应,利用SST资料、20世纪再分析资料和第六次耦合模式比较计划(CMIP6)所提供的太阳总辐照度(TSI)数据,采用线性回归的方法对TSI对热带太平洋SST年代际变化的可能影响进行了诊断研究。结果表明,热带中太平洋SST存在与TSI类似的准11年周期变化信号,TSI与SST以及其他海气变量之间存在显著相关关系。SST异常在滞后于TSI信号1～3年时的正相关达到最强,证实了热带中太平洋海表温度可能存在对TSI信号的滞后响应。进一步分析表明,由TSI所直接引起的海表净短波辐射变化可能是热带中太平洋SST在年代际尺度上变化的直接原因。海表温度的年代际异常可以通过海气相互作用引起表层纬向风的变化,并反过来增强SST的年代际变化信号。TSI正位相引起的SST正异常可促使对流层温度上升、空气中的水汽增加、上升运动加强等相应变化,进而使得总云量增加,因此滞后2～3年后可能会由于云-辐射反馈而引起进入海洋净短波辐射量的减少。
- Abstract:
- The response of decadal sea surface temperature(SST)variations in the tropical Pacific to solar radiation is discussed. Possible effects of the total solar irradiance(TSI)on the decadal variation of SST in the tropical central Pacific are diagnosed using the linear regression based on HadI SST, 20th-Century reanalysis, and TSI datasets. The results show that the SST anomaly in the tropical central Pacific is clearly lagged behind the TSI with a period of quasi-11 year. By comparing the relationships between the TSI index and SST as well as other atmospheric variables, the SST anomaly pattern is featured by the most significantly positive correlation at lag 1-3 years, confirming the presence of the TSI signals in the decadal SST anomalies in the tropical central Pacific but with a lag response. The net shortwave radiation caused in phase by the TSI is clearly the direct contributor to the warming of the tropical Pacific SST on the decadal timescale even though it might be reduced by the cloud-radiation feedback after 2-3 lag years. The positive SST anomalies could in duce changes in the surface zonal wind and might be in turn enhanced by the westerly wind anomalies through air-sea interaction over the tropical central Pacific.Also, these SST anomalies can warm tropospheric temperature and increase moisture into air, which favor formation of more cloud accompanied with the ascending motion. Both the responses of surface zonal wind and total cloud amount may provide a feedback onto SST itself in terms of dynamical and thermodynamical processes.
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备注/Memo
收稿日期:2019-02-21基金项目:国家重点研发资助项目(2018YFC1506004); 国家自然科学基金资助项目(41575091、41606019、41605116); 中国气象局公益专项研究基金资助项目(GYHY201506013)