| 摘要: |
| 黄海绿潮已成为中国近海一种新的自然灾害,对经济、环境等方面均有影响,研究黄海绿潮的生消过程及其影响因素,对进一步了解浒苔暴发机制、开展绿潮灾害防治工作有重要意义。基于拉格朗日运输模型(Larval TRANSport Lagrangian model,LTRANS),构建了可以模拟浒苔生长消亡的物理-生态耦合模型(Larval TRANSport Lagrangian model-Green Tide,LTRANS-GT),模拟了黄海浒苔漂移扩散和生长消亡过程,讨论了绿潮生物量季节变化特征及海表面温度、光照及氮磷营养盐在不同生消阶段所起到的作用。结果表明,在生长阶段,绿潮所在海域的海表面温度及光照处于适宜浒苔生长范围内,而氮磷营养盐浓度年际间差别较大。在消衰阶段,绿潮所在海域光照与生长阶段相比无明显差异,温度相较于生长阶段有着很明显的升高,且在浒苔消亡阶段末期平均温度均超过了26℃,温度的升高降低了浒苔的生长率,同时增加了浒苔的死亡率,此时氮磷营养盐均也处于较低水平。由敏感性试验结果发现,在生长阶段,海表面风场及表层流场的差异造成浒苔分布区域不同,带来的浒苔周围海域营养盐浓度差异是绿潮生长阶段年际差异的主导因素;在消衰阶段,温度的大幅上升及营养盐浓度的下降共同影响了绿潮消亡。 |
| 关键词: 绿潮 生消 海表面温度 营养盐 黄海 |
| DOI：10.11693/hyhz20220200032 |
| 分类号:X55 |
| 基金项目:青岛海洋科学与技术试点国家实验室山东省专项经费,2022QNLM010202-4号;国家自然科学基金,41876018号。 |
附件 |
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| GREEN TIDE IN THE YELLOW SEA FROM GENERATION TO EXTINCTION AND THE CNTROLING FACTOR |
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WANG Sheng1,2, ZHAO Liang1,2, ZHANG Hai-Yan3, LI Fei1,2
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1.Key Laboratory of Marine Resource Chemistry and Food Technology(TUST), Ministry of Education, Tianjin University of Science and Technology, Tianjin 300457, China;2.College of Marine and Environmental Sciences, Tianjin University of Science and Technology, Tianjin 300457, China;3.School of Marine Science and Technology, Tianjin University, Tianjin 300072, China
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| Abstract: |
| The frequent outbreak of Ulva prolifera green tide in the Yellow Sea in recent many years has become a new-type natural disaster in the offshore area in North and East China, which negatively affected the local economy and environment. It is important to study the course of green tide and its influencing factors to further understand the mechanism of U. prolifera outbreak and carry out to prevent and control of green tide disaster. Based on the Lagrangian transport model (LTRANS), a coupled physical-ecological model (LTRANS-GT) was constructed to simulate the growth and extinction of the green tide in the Yellow Sea. The seasonal changes in biomass of the green tide and the role of sea surface temperature, light, and nitrogen and phosphorus nutrients from generation to extinction were studied. Results show that the sea surface temperature and solar short-wave radiation of the sea area where the green tide distributed were suitable for U. prolifera in the growth stage, while nitrogen and phosphorus nutrient concentrations varied greatly every year. In the decay stage, the light condition was similar to that in the growth stage, but the temperature increased significantly above 26℃ at the end of the decay stage. The warmed-up water reduced the growth rate of U. prolifera and increased the mortality of them; meanwhile, the nitrogen and phosphorus nutrients were at lower level. The sensitivity test results show that in the growth stage, the difference of wind field and surface flow field at the sea surface were responsible for the difference in the distribution areas of the green tide, and the difference in nutrients concentration in the sea around U. prolifera growth areas was the main factor for causing the interannual difference in the growth stage. In the decay stage, the significant increase of temperature and the decrease of nutrients concentration jointly resulted in the green tide extinction. |
| Key words: green tide growth and extinction sea surface temperature nutrients the Yellow Sea |
