| Nan Xueliang,Wei Hao,Fan Renfu,Yang Wei. 2020. Rapid changes in the near-bottom temperature of the bottom aquaculture area around the Zhangzi Island in summer. Acta Oceanologica Sinica, 42(5):46－54 |
| Rapid changes in the near-bottom temperature of the bottom aquaculture area around the Zhangzi Island in summer |
| 獐子岛养殖区夏季底层水温快速变化的机理分析 |
| Received:July 28, 2019 |
| DOI：10.1007/s13131-020-1605-1 |
| Key words:near-bottom temperature horizontal advection tidal mixing front bottom culture area Zhangzi Island |
| 中文关键词: 近底水温 水平对流 潮汐锋 底播养殖区 獐子岛 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | Nan Xueliang | School of Marine Science and Technology, Tianjin University, Tianjin 300072, China | | | Wei Hao | School of Marine Science and Technology, Tianjin University, Tianjin 300072, China | | | Fan Renfu | School of Marine Science and Technology, Tianjin University, Tianjin 300072, China | | | Yang Wei | School of Marine Science and Technology, Tianjin University, Tianjin 300072, China | yangwouc@163.com |
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| Abstract: |
| Rapid changes in the near-bottom water temperature are important environmental factors that can significantly affect the growth and development of species in the bottom culture. The object of this research is to investigate the mechanism causing these rapid changes within a bottom culture area near the Zhangzi Island. The hydrographic transects observations in the North Yellow Sea (NYS) suggest that our mooring station is very close to the tidal mixing front. The horizontal advection of the tidal front has induced the observed tidal change of bottom temperature at the mooring station. Analysis of the mooring near-bottom temperature and current measurements show that the angle between the tidal current horizontal advection and the swing of the tidal front is crucial in determining the variation trend of temperature. When the angle equals 90°, the horizontal tidal current advects along the isotherms so the temperature remains the same. When the angle is between 0° and 90°, the seawater moves from deep water to the warmer coastal zone and the temperature decreases. In contrast, the horizontal tidal advection moves the coastal warm water to the mooring station and the water temperature increases when the angle is between 90° and 180°. The amplitude of the temperature change is proportional to the magnitude of the horizontal temperature gradient and the tidal excursion in the direction of the temperature gradient. This study may facilitate the choice of culture area in order to have a good aquaculture production. |
| 中文摘要: |
| 海底水温的快速变化是影响底栖生物生长发育的重要环境因素之一。本文通过分析獐子岛养殖区锚定观测获得的海底温度、海流并结合北黄海水文断面观测结果，旨在探究獐子岛养殖区海底水温快速变化的机理。通过对水文观测断面的分析可以看出锚定站位处于潮混合锋面所处位置附近，潮汐锋的水平对流引起锚定站位海底水温在观测期间有明显的潮周期变化。基于底温和海流的分析，潮流水平对流与潮汐锋面的摆动所形成的夹角是导致这种快速变化的原因，当夹角等于90°时，海水沿等温线或等温面流动，锚定站位温度保持不变；当夹角在0°到90°之间时，海水由深海向温暖的近岸移动，锚定站位温度下降；当夹角在90°到180°之间时，海水从温暖的近岸向深海流动，锚定站位水温升高。温度变化的幅度与水平温度梯度的大小和潮流在温度梯度方向的速度分量成正比。本研究有助于选择适宜的底播养殖区域，以获得更高的养殖产量。 |
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