热带太平洋海面高度的时空特征诊断与变化机理分析
发布时间：2019-05-28 02:12
【摘要】：利用1961年1月-2010年12月SODA的海面高度再分析资料、次表层温度、风应力资料和OAFlux的通量资料以及GPCP的降水资料,采用EOF、交叉小波和回归分析等统计方法,探讨了热带太平洋海面高度低频(季节、年际、年代际)时空变化特征及其影响因素。结果表明：(1)热带太平洋海面高度季节平均第一主模态与同期的ENSO事件密切相关,其中秋冬季二者相关性较强；热带太平洋海面高度年际第一模态为类ENSO模态,空间分布表现为热带中东太平洋与热带西太平洋位相相反,其显著周期为5.75年、3.5年；海面高度年代际第一模态为类PDO模态,其空间分布表现为东西方向的“跷跷板”分布,显著区域位于美洲沿岸和新几内亚岛东海岸,其显著周期包括10-15年和30年。(2) El Nino (La Nina)事件演变期间各因子对赤道中东太平洋海面高度的影响物理过程为：西太平洋纬向风应力正(负)异常使得表层暖水向东(西)运动,暖海水在赤道中东太平洋辐合(辐散),温跃层加深(变浅),海水热胀(冷却)效应使得赤道中东太平洋海面高度正异常；同期正的海水热含量异常有利于维持海洋的加热(冷却)状态,海气耦合效应使得海面净热通量为负(正)异常进而抑制的海水的快速加热(冷却),减缓海面高度的快速上升(下降)；同时,淡水通量在赤道中东太平洋发生正(负)异常,有利于海面高度正异常的发生；以上综合效应使得赤道中东太平洋海面高度为正(负)异常。各因子对热带西太平洋海面高度异常的作用则与上述物理过程相反。这种物理过程在El Nino (La Nina)发展年夏季开始出现,秋冬季达到强盛期,翌年春季开始减弱。(3)年际尺度上,各影响因子(风应力、热通量、淡水通量)与海面高度ENSO模态对应的时间系数的回归系数分布型态与合成分析中对应的El Nino(La Nina)发展年秋冬季异常特征分布型态较为一致。(4)年代际尺度上,海面高度与海表温度的显著相关区位于热带东太平洋；与热含量的显著相关区域位于美洲沿岸和新几内亚岛以东海域；与纬向风应力的显著相关区位于热带中太平洋,而与经向风应力的显著相关区域则主要位于大洋沿岸区域。1961-2010年期间,热含量与海面高度年代际异常相关性较为稳定,纬向风应力与海面高度年代际异常相关性在热带太平洋中部较为稳定,海表温度与海面高度年代际异常相关稳定性较差。
[Abstract]:Based on the sea surface height reanalysis data of SODA from January 1961 to December 2010, subsurface temperature, wind stress data, OAFlux flux data and GPCP precipitation data, EOF, cross wavelet and regression analysis are used. The temporal and spatial variation characteristics of sea surface height and low frequency (seasonal, interannual, Interdecadal) in the tropical Pacific Ocean and its influencing factors are discussed. The results show that: (1) the first main mode of seasonal average sea surface height in the tropical Pacific is closely related to the ENSO event in the same period, and there is a strong correlation between the two modes in autumn and winter; The first mode of sea surface height in tropical Pacific is ENSO-like mode, and the spatial distribution is opposite between tropical Middle East Pacific and tropical western Pacific, and its significant period is 5.75 years and 3.5 years. The first mode of sea surface height Interdecadal is PDO-like mode, and its spatial distribution is a seesaw distribution in the east-west direction, and the significant area is located along the coast of America and the east coast of New Guinea. The significant periods include 10-15 years and 30 years. (2) the physical process of the influence of various factors on the sea surface height of the equatorial Middle East Pacific during the evolution of the) El Nino (La Nina) event is that the zonal wind stress in the western Pacific leads to the positive (negative) anomaly of the zonal wind stress. The surface warm water moves east (west), Warm sea water converges (divergence) in the equatorial Middle East Pacific, and the thermocline deepens (shallower). The thermal expansion (cooling) effect of sea water makes the sea surface height of the equatorial Middle East Pacific positively abnormal. At the same time, the abnormal thermal content of seawater is beneficial to maintain the heating (cooling) state of the ocean, and the coupling effect of sea and air makes the net heat flux of the sea a negative (positive) anomaly and then suppresses the rapid heating (cooling) of sea water. Slow down the rapid rise (decline) of sea surface height; At the same time, the positive (negative) anomalies of freshwater fluxes occur in the equatorial Middle East Pacific, which is beneficial to the occurrence of positive anomalies in sea surface height, and the above comprehensive effects make the sea surface height in the equatorial Middle East Pacific a positive (negative) anomaly. The effect of each factor on the sea surface height anomaly in the tropical western Pacific is opposite to the above physical process. This physical process began to appear in the summer of the El Nino (La Nina) development year, reached a strong period in autumn and winter, and began to weaken in the spring of the following year. (3) on the interannual scale, the influencing factors (wind stress, heat flux, The regression coefficient distribution pattern of the time coefficient corresponding to the ENSO mode of the sea surface height is consistent with the abnormal distribution pattern of the autumn and winter of the El Nino (La Nina) development year in the synthetic analysis. (4) on the Interdecadal scale, The significant correlation between sea surface height and sea surface temperature is located in the tropical eastern Pacific Ocean. The significant correlation area with heat content is located along the coast of America and east of New Guinea Island. The significant correlation area with zonal wind stress is located in the tropical central Pacific, while the significant correlation area with meridional wind stress is mainly located along the ocean coast. From 1961 to 2010, the correlation between heat content and Interdecadal anomaly of sea surface height is stable. The correlation between zonal wind stress and sea surface height Interdecadal anomaly is stable in the central tropical Pacific Ocean, but the correlation stability between sea surface temperature and sea surface height Interdecadal anomaly is poor.
【学位授予单位】：南京信息工程大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P731.2
本文编号：2486643
[Abstract]:Based on the sea surface height reanalysis data of SODA from January 1961 to December 2010, subsurface temperature, wind stress data, OAFlux flux data and GPCP precipitation data, EOF, cross wavelet and regression analysis are used. The temporal and spatial variation characteristics of sea surface height and low frequency (seasonal, interannual, Interdecadal) in the tropical Pacific Ocean and its influencing factors are discussed. The results show that: (1) the first main mode of seasonal average sea surface height in the tropical Pacific is closely related to the ENSO event in the same period, and there is a strong correlation between the two modes in autumn and winter; The first mode of sea surface height in tropical Pacific is ENSO-like mode, and the spatial distribution is opposite between tropical Middle East Pacific and tropical western Pacific, and its significant period is 5.75 years and 3.5 years. The first mode of sea surface height Interdecadal is PDO-like mode, and its spatial distribution is a seesaw distribution in the east-west direction, and the significant area is located along the coast of America and the east coast of New Guinea. The significant periods include 10-15 years and 30 years. (2) the physical process of the influence of various factors on the sea surface height of the equatorial Middle East Pacific during the evolution of the) El Nino (La Nina) event is that the zonal wind stress in the western Pacific leads to the positive (negative) anomaly of the zonal wind stress. The surface warm water moves east (west), Warm sea water converges (divergence) in the equatorial Middle East Pacific, and the thermocline deepens (shallower). The thermal expansion (cooling) effect of sea water makes the sea surface height of the equatorial Middle East Pacific positively abnormal. At the same time, the abnormal thermal content of seawater is beneficial to maintain the heating (cooling) state of the ocean, and the coupling effect of sea and air makes the net heat flux of the sea a negative (positive) anomaly and then suppresses the rapid heating (cooling) of sea water. Slow down the rapid rise (decline) of sea surface height; At the same time, the positive (negative) anomalies of freshwater fluxes occur in the equatorial Middle East Pacific, which is beneficial to the occurrence of positive anomalies in sea surface height, and the above comprehensive effects make the sea surface height in the equatorial Middle East Pacific a positive (negative) anomaly. The effect of each factor on the sea surface height anomaly in the tropical western Pacific is opposite to the above physical process. This physical process began to appear in the summer of the El Nino (La Nina) development year, reached a strong period in autumn and winter, and began to weaken in the spring of the following year. (3) on the interannual scale, the influencing factors (wind stress, heat flux, The regression coefficient distribution pattern of the time coefficient corresponding to the ENSO mode of the sea surface height is consistent with the abnormal distribution pattern of the autumn and winter of the El Nino (La Nina) development year in the synthetic analysis. (4) on the Interdecadal scale, The significant correlation between sea surface height and sea surface temperature is located in the tropical eastern Pacific Ocean. The significant correlation area with heat content is located along the coast of America and east of New Guinea Island. The significant correlation area with zonal wind stress is located in the tropical central Pacific, while the significant correlation area with meridional wind stress is mainly located along the ocean coast. From 1961 to 2010, the correlation between heat content and Interdecadal anomaly of sea surface height is stable. The correlation between zonal wind stress and sea surface height Interdecadal anomaly is stable in the central tropical Pacific Ocean, but the correlation stability between sea surface temperature and sea surface height Interdecadal anomaly is poor.
【学位授予单位】：南京信息工程大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P731.2
【参考文献】
相关期刊论文 前1条
1 李艳芳;左军成;李娟;陈美香;;热带太平洋海面风的年际变化对海平面变化的影响[J];中国海洋大学学报(自然科学版);2012年12期
，本文编号：2486643
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