| 东太平洋冷舌区海表面温度日变化特征的模拟研究 |
| |
| 引用本文： | 林鹏飞,刘海龙,章丽娜,等.东太平洋冷舌区海表面温度日变化特征的模拟研究[J].大气科学,2012,36(2):259-270. |
| |
| 作者姓名： | 林鹏飞 刘海龙 章丽娜 等 |
| |
| 作者单位： | 1.中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室, 北京 100029中国气象局培训中心, 北京100081 |
| |
| 基金项目： | 国家重点基础研究发展规划项目2010CB950502， 国家自然科学基金资助项目40906012， 优秀国家重点实验室研究项目41023002， 中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室自由探索， 中国科学院战略性先导资助项目XDA05110302， 国家高技术研究发展计划2010AA012303 |
| |
| 摘 要： | 本文通过分辨太阳辐射日变化, 利用中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室 (LASG/IAP) 气候系统海洋环流模式 (LICOM), 模拟了东太平洋冷舌区海表面温度 (SST) 的日变化特征并研究了弱混合对其影响。采用理想的太阳辐射日变化强迫上层垂向分辨率为10 m的海洋模式LICOM, 模拟出了SST日变化一些特征, 同时海洋的上层流场也产生明显日变化。模拟的SST日变化振幅水平分布与观测接近, 且受太阳辐射日变化振幅水平分布调制。在赤道中东太平洋区, 模拟的SST日变化振幅 (约为0.3～0.4℃) 比观测偏小约0.1～0.2℃。模拟的SST日变化峰值出现在15～16 时 (当地标准时间), 落后于太阳辐射峰值2～3个小时, 接近观测。进一步减弱混合后, 模拟的日变化振幅增加约0.1℃, 更接近观测。这说明在东太平洋冷舌区SST日变化主要受太阳辐射日变化和垂直混合影响。此外, 混合减小后, 在太阳辐射日变化调制下, 平均态 (如混合层、温度和流场) 也出现明显变化。在赤道东太平洋冷舌区北侧, 弱混合导致混合层变浅, 变浅使热量堆积进而使平均SST升高约0.3℃; 在赤道东太平洋冷舌南侧, 经向平流加强导致平均SST降低约0.2℃。
|
| 关 键 词： | 海表面温度(SST)日变化模拟混合东太平洋冷舌 |
The Simulation Study of the Features of Diurnal Variation of Sea Surface Temperature in the Eastern Pacific Cold Tongue |
| |
| Lin Pengfei,Liu Hailong,Zhang Lina and et al.The Simulation Study of the Features of Diurnal Variation of Sea Surface Temperature in the Eastern Pacific Cold Tongue[J].Chinese Journal of Atmospheric Sciences,2012,36(2):259-270. |
| |
| Authors: | Lin Pengfei Liu Hailong Zhang Lina and |
| |
| Institution: | 1.State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029China Meteorological Administration Training Center, Beijing 1000812.State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 1000293.China Meteorological Administration Training Center, Beijing 100081 |
| |
| Abstract: | The features of diurnal variation of sea surface temperature (SST) are simulated in the LASG/IAP Climate System Ocean Model (LICOM) by resolving the diurnal variation of solar radiation and the influence of weak mixing is investigated. Forced by the ideal diurnal variation of solar radiation, some features of diurnal variation of SST can be captured in LICOM with 10-m vertical resolution in the upper layers. The diurnal variation of solar radiation also results in diurnal variation of currents in the upper layers. The horizontal distribution of diurnal amplitude of simulated SST is consistent with that of observed SST and modulated by the diurnal amplitude of solar radiation. In the eastern Pacific cold tongue, the diurnal amplitude of simulated SST is about 0.3℃-0.4℃ and 0.1℃-0.2℃, smaller than that of observations. The peak of daily SST variation appears during 1500-1600 LST and lags 2-3 hours than the peak time of daily solar radiation, which is close to observation. After reducing mixing, the diurnal amplitude of SST variation increases in the equatorial eastern Pacific cold tongue, closer to observation. This indicates that the features of diurnal variation in the equatorial eastern Pacific cold tongue are mainly controlled by the diurnal variation of solar radiation and vertical mixing. After reducing mixing, under the modulation of solar radiation, the mean states including the mixed layer depth, temperatures and currents are obviously changed. In the northern part of the eastern Pacific cold tongue, the reduced mixing causes heat accumulation in the upper layers and then leads to an increase in SST about 0.3℃. While in the southern part, the enhanced meridional advection leads to a decrease in SST about 0.2℃. |
| |
| Keywords: | diurnal variation of sea surface temperature (SST) simulation mixing eastern Pacific cold tongue |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《大气科学》浏览原始摘要信息 |
| 点击此处可从《大气科学》下载免费的PDF全文 |
|
