| TU Qianguang,PAN Delu,HAO Zengzhou,YAN Yunwei. 2016. SST diurnal warming in the China seas and northwestern Pacific Ocean using MTSAT satellite observations. Acta Oceanologica Sinica, 35(12):12－18 |
| SST diurnal warming in the China seas and northwestern Pacific Ocean using MTSAT satellite observations |
| 基于MTSAT卫星遥感的中国海及西北太平洋海域海表温度日增温研究 |
| Received:September 30, 2015 Revised:January 22, 2016 |
| DOI：10.1007/s13131-016-0968-9 |
| Key words:diurnal warming sea surface temperature remote sensing MTSAT |
| 中文关键词: 日增温 海表温度 遥感 MTSAT |
| 基金项目: |
| Author Name | Affiliation | E-mail | | TU Qianguang | State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
Department of Earth Science, Zhejiang University, Hangzhou 310027, China
College of Geomatics and Municipal Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China | | | PAN Delu | State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
Department of Earth Science, Zhejiang University, Hangzhou 310027, China | | | HAO Zengzhou | State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | hzyx80@sio.org.cn | | YAN Yunwei | State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | |
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| Abstract: |
| Hourly sea surface temperature (SST) observations from the geostationary satellite are increasingly used in studies of the diurnal warming of the surface oceans. The aim of this study is to derive the spatial and temporal distribution of diurnal warming in the China seas and northwestern Pacific Ocean from Multi-functional Transport Satellite (MTSAT) SST. The MTSAT SST is validated against drifting buoy measurements firstly. It shows mean biases is about -0.2℃ and standard deviation is about 0.6℃ comparable to other satellite SST accuracy. The results show that the tropics, mid-latitudes controlled by subtropical high and marginal seas are frequently affected by large diurnal warming. The Kuroshio and its extension regions are smaller compared with the surrounding regions. A clear seasonal signal, peaking at spring and summer can be seen from the long time series of diurnal warming in the domain in average. It may due to large insolation and low wind speed in spring and summer, while the winter being the opposite. Surface wind speed modulates the amplitude of the diurnal cycle by influencing the surface heat flux and by determining the momentum flux. For the shallow marginal seas, such as the East China Sea, turbidity would be another important factor promoting diurnal warming. It suggests the need for the diurnal variation to be considered in SST measurement, air-sea flux estimation and multiple sensors SST blending. |
| 中文摘要: |
| 本文利用静止卫星MTSAT遥感逐时反演的海表温度数据，分析了中国海及邻近的西北太平洋海域海表温度日增温变化的时空分布特征。首先利用漂移浮标测量的SST对研究区域内MTSAT卫星反演的SST进行了验证，结果显示反演的SST存在约0.2℃的负偏差，其标准差约0.6℃，总体精度与其他卫星资料相当。结合风场和净热通量资料，通过多年的MTSAT数据分析了SST的日增温变化特征及原因，结果表明：空间上，热带、亚热带副高控制海域和一些边缘海地区经常发生大幅度的日变化事件，黑潮及其延伸体的日变化比周围临近区域小；时间上，研究区域内SST的日变化存在明显的季节性变化，峰值主要出现在春、夏季；这可能是由于春、夏季的日照不断增强和持续的低风速，而冬季则相反。海面风速通过影响热通量和表面动量通量来调制日变化的幅度，但对于一些深度较浅的边缘海，浊度也是影响日变化的一个重要因素。因此，在测量SST，海气通量估计和多传感器SST融合等研究中还需深入考虑SST日变化的影响。 |
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