季节内振荡对热带印度洋SST日变化的调制——一维混合层模式的诊断结果

杨洋; Tim Li; 李奎平; 于卫东; 刘延亮

doi:10.3969/j.issn.0253-4193.2015.05.004

季节内振荡对热带印度洋SST日变化的调制——一维混合层模式的诊断结果

doi: 10.3969/j.issn.0253-4193.2015.05.004

1.
中国海洋大学海洋环境学院, 山东青岛 266100;国家海洋局第一海洋研究所海洋与气候研究中心, 山东青岛 266061
2.
美国夏威夷大学气象系, 美国夏威夷火奴鲁鲁 96822
3.
国家海洋局第一海洋研究所海洋与气候研究中心, 山东青岛 266061

基金项目: 中央级公益性科研院所基本科研业务费专项资金(2014G03,GY02-2011G22),国家自然科学基金项目(41005032,41406034)。

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出版历程
- 收稿日期: 2014-09-10
- 修回日期: 2014-11-05

Modulation of Madden-Julian Oscillation on the diurnal cycle of SST in the tropical Indian Ocean—Results from one dimensional mixed layer model

1.
College of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266100, China;Center for Ocean and Climate Research, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
2.
IPRC and Department of Meteorology, University of Hawaii, Honolulu, HI, USA
3.
Center for Ocean and Climate Research, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China

摘要

摘要: 热带印度洋SST的日变化幅度受到大气季节内振荡(Madden-Julian Oscillation,MJO)的调制,其在MJO对流最强(弱)位相达到极小(大)值,并且在MJO对流增强位相显著强于其对流减弱位相。本文利用逐时的再分析海表通量强迫一维海洋混合层模式,定量地诊断了MJO事件中SST日变化的差异成因。结果表明,SST日变化在MJO对流最强与最弱位相的显著差异主要是由短波辐射的季节内变化所致(40%),其次是风应力(38%)和潜热通量(14%),其他要素的影响较小。而SST日变化在MJO对流增强与减弱位相所呈现的不对称特征,主要是由纬向风应力的不对称性所致,这是MJO扰动结构与背景环流相互作用的结果。
- SST日变化 /
- 季节内振荡 /
- 一维混合层模式
Abstract: Modulated by the Madden-Julian Oscillation (MJO),the diurnal range of sea surface temperature (SST) peaks on the convection suppressed phase and drops to its lowest on the convection active phase. What's more,this kind of diurnal range on the developing phase of MJO is much larger than that on the decaying phase. Using a one-dimensional ocean mixed layer model,forced by the newly developed hourly reanalysis of sea surface fluxes,the cause of the difference of diurnal range of SST during the evolution of MJO is diagnosed quantitatively. It is demonstrated that the intro-seasonal variation of sea surface shortwave radiation is the main reason for the striking difference of diurnal range of SST between suppressed phase and active phase of MJO (40%). The intra-seasonal variation of wind stress (38%) and latent heat flux (14%) are also important. Due to the scale interaction between MJO perturbation and background circulation,the asymmetry of zonal wind stress determines the asymmetry of diurnal range of SST between developing and decaying phase of MJO.
- diurnal range of sea surface temperature (SST) /
- Madden-Julian Oscillation /
- one dimensional ocean mixed layer model

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