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严晓海研究团队发现南太平洋辐聚带和厄尔尼诺及太平洋年代际震荡的新关系
海洋与地球学院 海洋与地球学院 2016/2/4 5533 返回上页

2016年1月13日,严晓海教授研究团队在JCR地学一区期刊Journal of Climate在线发表题为“Characterization of the variability of the South Pacific Convergence Zone using satellite and reanalysis wind products”的研究论文(论文链接: http://journals.ametsoc.org/doi/pdf/10.1175/JCLI-D-15-0536.1)。

目前全球气候在1998年之后发生重大调整:全球气候变暖出现了减缓现象(1998-2013),与地表温度随温室气体浓度的快速升高而增加的一般预期出现了矛盾。低纬贸易风增强,东热带太平洋变冷。在如此显著的温度变化速率条件下,全球各个地区极端热与极端冷事件增加。在此背景下,严晓海教授研究团队分析比较遥感QuikSCAT和模式现场观测再分析数据,发现了南太平洋辐聚带(SPCZ)变化和厄尔尼诺(El Niño)及太平洋年代际震荡(PDO)之间的新关系。此研究增进了科学界对南太平洋辐聚带在全球气候变化研究中重要性的认识,揭示了南太平洋辐聚带从未被报道过的重要变化。

严晓海教授研究团队长期从事物理海洋、海洋遥感及气候变化研究,并取得一系列成果。本研究揭示了SPCZ和El Niño及PDO的关系,有助于理解全球增暖减缓现象的潜在机理,并为近期全球发生在各个地区的极端热和极端冷的事件提供了更好的理解,有助于灾害防治和生态保护的政策制定。

该论文的主要工作由严晓海教授,厦大/特拉华大学联合研究所-特拉华大学博士生 Autumn Kidwell,NASA-JPL科学家Tony Lee,韩国釜山国立大学Young-Heon Jo博士共同完成。该研究工作获得了“千人计划”、国家自然科学基金委和美国航空航天局太空资助项目(NASA-Space Grant)的资助。

 

Abstract:

The variability of the South Pacific Convergence Zone (SPCZ) is evaluated using ocean surface wind products derived from the ERA-Interim atmospheric reanalysis for the period of 1981-2014 and QuickSCAT satellite scatterometer for the period of 1999-2009. From these products, indices were developed to represent the SPCZ strength, area, and centroid location. Excellent agreement is found between the indices derived from the two wind products during the QuikSCAT period in terms of the spatio-temporal structures of the SPCZ. The longer ERA-Interim product is used to study the variations of SPCZ properties on intraseasonal, seasonal, interannual, and decadal time scales. The SPCZ strength, area, and centroid latitude have a dominant seasonal cycle. In contrast, the SPCZ centroid longitude is dominated by intraseasonal variability due to MJO influence. The SPCZ indices are all correlated with El Niño-Southern Oscillation indices. Interannual and intraseasonal variations of SPCZ strength during strong El Niño are approximately twice as large as the respective seasonal variations. SPCZ strength depends more on the intensity of El Niño rather than the central- vs. eastern-Pacific type. The change from positive to negative PDO around 1999 results in a westward shift of the SPCZ centroid longitude, much smaller interannual swing in centroid latitude, and a decrease in SPCZ area. This study improves the understanding of the variations of the SPCZ on multiple time scales and reveals the variations of SPCZ strength not reported previously. The diagnostics analyses can be used to evaluate climate models to gauge their fidelity.

Citation: Autumn Kidwell, Tong Lee, Young-Heon Jo, and Xiao-Hai Yan. Characterization of the variability of the South Pacific Convergence Zone using satellite and reanalysis wind products. Journal of Climate, 2016, doi:10.1175/JCLI-D-15-0536.1.