基于融合遥感数据的广东沿岸温度锋面的季节变化研究*
作者简介:邱春华(1983—), 女, 山东省滨州市人, 副教授, 博士, 主要从事海气相互作用、海洋环流等研究工作。E-mail: qiuchh3@mail. sysu.edu.cn
收稿日期: 2016-12-01
要求修回日期: 2017-01-11
网络出版日期: 2017-09-22
基金资助
国家重点研发计划(2017YFC0305804)
国家自然科学基金青年基金项目(41406002)
广东省自然科学基金自由申请项目(2015A030313151)
中山大学高校基本科研业务费优秀青年教师重点培育项目(17lgzd11)
Seasonal variation of Guangdong coastal thermal front based on merged satellite data
Author:QIU Chunhua.E-mail: qiuchh3@mail. sysu.edu.cn
Received date: 2016-12-01
Request revised date: 2017-01-11
Online published: 2017-09-22
Supported by
National Key R&D Program of China (2017YFC0305804)
Young Scientists Fund of the National Natural Science Foundation of China (41406002)
Natural Science Foundation of Guangdong Province (2015A030313151)
Distinguished Young Teachers of Fundamental Research Funds for the Central Universities (17lgzd11)
Copyright
基于2015年全年多源遥感数据融合的Operational Sea Surface Temperature and Sea Ice Analysis(OSTIA)海表温度数据, 利用最大温度梯度法, 对广东沿岸(20°—23°N, 110°—118°E)海表温度锋面的季节变化及生消机制进行了分析。广东沿岸温度锋面季节变化明显, 冬季强, 夏季弱;粤东温度锋面常年存在, 粤西温度锋面夏季消失;珠江口区域温度锋面与珠江羽状流的扩散路径有关, 即夏季锋面主轴往东北方向延伸, 秋季往西南方向延伸。对比温度锋面与风速的关系, 发现其形成及消失受季风的影响。通过简单的模型实验, 发现季风通过影响锋面两侧的湍流热通量引起锋面强度的变化: 西南(东北)季风带来的暖湿(干冷)空气减弱(增加)了近岸冷水的潜热释放, 导致冷水区温度上升(下降)大于暖水区, 引起锋面消失(生成)。
邱春华 , 崔永生 , 胡诗琪 , 霍丹 . 基于融合遥感数据的广东沿岸温度锋面的季节变化研究*[J]. 热带海洋学报, 2017 , 36(5) : 16 -23 . DOI: 10.11978/2016125
Based on the Operational Sea Surface Temperature and Sea Ice Analysis (OSTIA) data in 2015, we analyzed the seasonal variation and genesis mechanisms of thermal fronts in Guangdong coastal zone. The Guangdong coastal thermal fronts are strong in winter and weak in summer. In the eastern Guangdong coastal zone, thermal fronts are seen all year round, while in the western Guangdong coastal zone, thermal fronts disappear in summer. In the Pearl River estuary zone, thermal fronts are associated with the Pearl River plumes, which extend east northward in summer and southward in autumn. We suggest wind speed play important roles in the genesis and disappearance of these thermal fronts. Using a simple model, we find that monsoon influences the front strength through air-sea turbulent heat fluxes. Under southwesterly (northeasterly) wind condition, warm and wet (cold and dry) air mass could decrease (increase) the latent heat release near the cold coastal zone, leading to a temperature increase in the cold zone, and finally the front disappears.
Fig. 1 Study area. Isobaths are water depths. Units: m图1 研究区域图 |
Fig. 2 New coordinates (dashed) and old coordinates (solid)图2 新、旧坐标系 |
Fig. 3 OSTIA SST (a), in situ SST (b), scatter plots between OSTIA SST and in situ SST (c), and seasonal variation of zonal mean SST (d)图3 2015年 6月14日OSTIA海表温度数据(a)、现场观测数据(b)、观测数据与实测数据的散点图(c)以及不同区域海表温度的季节变化(d) |
Fig. 4 Spatial distributions of SST in (a) winter, (b) spring, (c) summer, and (d) autumn图4 海表温度空间分布 |
Fig. 5 The SST gradient magnitude from (a) maximum gradient method, and (b) gradient magnitude method on Jan. 8th, 2015. (c) Maximum gradient method, and (d) gradient magnitude method on May 3rd, 2015. Units: ℃·(5 km)-1图5 2015年1月8日梯度最大化方法(a)和普通梯度方法(b)以及5月3日梯度最大化方法(c)和普通梯度法(d)得到的温度梯度状况(色柱单位: ℃·(5km)-1) |
Fig. 6 Seasonal variation of SST gradient magnitude in (a) winter, (b) spring, (c) summer, and (d) autumn. Units: ℃·(5 km)-1图6 温度锋面分布图 |
Fig. 7 Monthly mean (a) SST gradient magnitude and (b) wind speed. The error bar stands for the standard deviation of SST gradient magnitude图7 粤东沿岸温度梯度(a)和风速大小(b)的季节变化 |
Fig. 8 (a) Spatial distribution of SST, and (b) SST temporal variation at stations A and B. A and B stand for cold ad warm zones, respectively. Purple arrow stands for wind speed图8 温度的空间分布图(a)及变化趋势(b) |
The authors have declared that no competing interests exist.
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