Spring‐neap tidal effects on satellite ocean color observations in the Bohai Sea, Yellow Sea, and East China Sea
Spring‐neap tidal effects on satellite ocean color observations in the Bohai Sea, Yellow Sea, and East China Sea
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DOI：
10.1029/2011jc007234
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发表时间：
2011-12
影响因子：
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通讯作者：
W. Shi;Menghua Wang;Lide Jiang
中科院分区：
文献类型：
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作者：
W. Shi;Menghua Wang;Lide Jiang
[1]利用Aqua卫星上的MODIS (Moderate Resolution Imaging Spectroradiometer) 2002 - 2009年8年的海洋颜色观测数据，定量评价了春季小潮对渤海、黄海和东海海洋光学和生物地球化学性质变化的影响。研究表明，春季小潮潮汐变化是驱动沿海地区海洋光学、生物和生物地球化学性质的天气尺度和中尺度变化的重要海洋过程之一。在29.53 d的月圆周期内，归一化水辐射光谱（nLw(λ)）、490 nm波长处的水扩散衰减系数（Kd(490)）和总悬浮物（TSM）浓度显示了沿海地区春季小潮的显著变化。然而，在开阔的海洋中，春季小潮对海洋颜色数据的影响可以忽略不计。浑浊水域（Kd(490) > 0.3 m−1）的面积覆盖范围为~ 4-5 × 105 km2，显示出明显的春季小潮变化。中等浑浊水域（0.1 < Kd(490)≤0.3 m−1）的覆盖度也受到春季小潮的影响。春季小潮对卫星海洋颜色特性Kd（490）和TSM变化的影响程度与沿海地区的季节变化程度相同。最高Kd（490）和最大浑浊水覆盖比新月（或满月）晚2-3天，而最低Kd（490）和最小浑浊水覆盖也比四分之一（或四分之三）月亮晚2-3天。这是由于海水的惯性和对海床的摩擦以及沉积物的再悬浮过程。
[1] Eight-year ocean color observations between 2002 and 2009 from the Moderate Resolution Imaging Spectroradiometer (MODIS) onboard the Aqua satellite are used to quantitatively assess the spring-neap tidal effects on variability of ocean optical and biogeochemical properties in the Bohai Sea, Yellow Sea, and East China Sea. We demonstrate that spring-neap tidal variation is one of important ocean processes that drive both the synoptic-scale and mesoscale changes of the ocean optical, biological, and biogeochemical properties in the coastal region. Normalized water-leaving radiance spectra (nLw(λ)), water diffuse attenuation coefficient at the wavelength of 490 nm (Kd(490)), and total suspended matter (TSM) concentration show significant spring-neap variations in the coastal region within a lunar cycle of 29.53 days. In the open ocean, however, spring-neap tidal effects on ocean color data are negligible. The entire areal coverage of the turbid waters (Kd(490) > 0.3 m−1) showing significant spring-neap tidal variations is ∼4–5 × 105 km2. Similar coverage of moderately turbid waters (0.1 < Kd(490) ≤ 0.3 m−1) is also impacted by the spring-neap tides. The magnitude of the spring-neap tidal effects on the variations of the satellite ocean color properties, e.g., Kd(490) and TSM, is in the same order as the seasonal variations in the coastal region. Highest Kd(490) and largest turbid water coverage lag the new moon (or full moon) about 2–3 days, while the lowest Kd(490) and smallest turbid water coverage are also ∼2–3 days behind the one-quarter (or three-quarter) moon. This is attributed to the seawater inertia and the friction against the seabed as well as the sediment resuspension process.