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黄海绿潮生消过程及其主导因素
王圣1, 赵亮1, 张海彦2, 李菲1
1.天津科技大学海洋与环境学院 天津;2.天津大学海洋科学与技术学院 天津
摘要:
黄海绿潮多年连续暴发,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(LTRANS),构建了可以模拟浒苔生长消亡的物理-生态耦合模型(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太阳短波辐射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:
基金项目:
GREEN TIDE GENERATION AND EXTINCTION PROCESS IN THE YELLOW SEA AND ITS DOMINANT FACTOR
WANG Sheng1, ZHAO Liang1, ZHANG Hai-Yan2, LI Fei1
1.College of Marine and Environmental Sciences,Tianjin University of Science and Technology;2.School of Marine Science and Technology,Tianjin University
Abstract:
The continuous outbreak of green tide in the Yellow Sea for many years has become a new natural disaster in the offshore of China, which has impact on economy and environment. It is important to study the process of green tide and its influencing factors to further understand the mechanism of Ulva prolifera outbreak and carry out the prevention 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 Ulva prolifera in the Yellow Sea. The seasonal changes in the biomass of green tide and the role of sea surface temperature, light and nitrogen and phosphorus nutrients in its growth and extinction process were discussed. The results showed that the sea surface temperature and solar short-wave radiation of the sea area where the green tide is located are within the range suitable for the growth of Ulva prolifera, while the nitrogen and phosphorus nutrient concentrations vary greatly from year to year. In the decay stage, there is no significant difference between the light and the growth stage of the sea where the green tide is located, and the temperature has increased significantly compared with the growth stage, and the average temperature exceeds 26℃ at the end of the decay stage, the increase of temperature reduces the growth rate of the Ulva prolifera, and increases the mortality rate of the Ulva prolifera, and the nitrogen and phosphorus nutrient salts are at a lower level at this time. From the sensitivity test results, it was found that in the growth stage, the difference of wind field and surface flow field on the sea surface caused the different distribution area of the Ulva prolifera, which brought the difference of nutrient salt concentration in the sea around the Ulva prolifera was the dominant factor of the interannual difference in the growth stage of the green tide; in the decay stage, the significant increase of temperature and the decrease of nutrient salt concentration jointly affected the green tide extinction.
Key words:  Green tide  growth and extinction  sea surface temperature  nutrient salts  Yellow Sea
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