中太平洋和东太平洋La Niña类型的形成特征

Pub Date : 2022-01-01 DOI:10.21638/spbu07.2022.205
O. Marchukova, E. Voskresenskaya
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引用次数: 0

摘要

本文分析了1998 - 2018年La Niña事件期间globcolor项目在赤道太平洋的全球海洋叶绿素«a»(Chl a)浓度数据集。GlobColour包括诸如SeaWiFS、MODIS、MERIS等卫星传感器。叶绿素«a»浓度变化的研究是通过分析1981年至2018年NCEP GODAS再分析的海温和海洋表面和海洋深处的洋流分布来进行的。此外,还使用了1979 - 2018年的信风指数。本研究的目的是研究两种La Niña类型的形成机制,从而导致地球不同地区发生不同的气候异常。结果表明,在中太平洋La Niña型成因初始阶段,赤道太平洋中部的海洋叶绿素«a»浓度增加了6 ~ 8倍(从0.1 mg/m3增加到0.8 mg/m3),该区域的温跃层深度减小到50 m,表明赤道中部上升流增强。在东太平洋拉尼娜型期间,秘鲁上升流的增加支持东太平洋赤道区信风的增强,导致赤道中部上升流不形成,海面温度负异常形成。所有得到的结果经学生检验均有95%的统计学显著性。从而证明了两种La Niña类型在其起源初始阶段的形成特征存在显著差异。
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Features of the formation of the Central and East Pacific La Niña types
In this paper the dataset of global ocean chlorophyll «a» (Chl a) concentration from the GlobColour project over the equatorial Pacific during the La Niña events from 1998 to 2018 is analyzed. GlobColour includes satellite sensors such as SeaWiFS, MODIS, MERIS and others. The study of changes in chlorophyll «a» concentration is carried out with an analysis of sea temperature and current distributions on the surface and over the ocean depth taken from the NCEP GODAS reanalysis from 1981 to 2018. Additionally the trade wind indices from 1979 to 2018 are used. The purpose of the work is to study the mechanisms of formation of two La Niña types, leading to the occurrence of different climatic anomalies in different regions of our planet. It is found that at the initial stage of the Central Pacific La Niña type origin the ocean chlorophyll «a» concentration over the center equatorial Pacific increases in six to eight times (from 0.1 mg/m3 to 0.8 mg/m3) and the thermocline depth in this area decreases to 50 m indicating the intensification of the central equatorial upwelling. During the East Pacific La Nina type the central equatorial upwelling is not formed and negative sea surface temperature anomalies are formed by increasing of the Peruvian upwelling supported intensification trade winds on the East Pacific equatorial sector. All obtained results are confirmed by a 95% statistically significant by Student's test. Thus, the work is demonstrated significant differences in the features of the two La Niña types formation at their initial stage of origin.
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