| 摘要: |
| 在全球变暖背景下,海洋上层平均温度的上升将可能导致更频繁的极端高温事件。渤海生态系统将会面临更大的风险和挑战,了解海洋极端高温事件的发生过程,可为应对将来气候变化和防灾减灾提供有力支撑。通过长期现场观测和卫星遥感数据,发现渤海8月海表温度(sea surface temperature,SST)在2013年发生温度跃迁,并利用regional ocean modeling system (ROMS)物理模型分析了2013年之后渤海夏季升温的影响因素。2013~2019年阶段8月的SST,比1994~2012年阶段整体高1.37℃。在空间分布上,表层水体升温较大区域主要集中在3个海湾及渤海中部浅滩。在水体温度结构上,2013年之后夏季上混合层温度整体升高,上混合层厚度变薄,温跃层整体变浅;表底温差增大,水体层结增强约17.5%。2013年之后渤海表层水体的升温现象总体上存在于春季和夏季,升温幅度在春季呈线性增强趋势,而在夏季处于稳定的状态。春季的热量累积为夏季升温提供了一个较高的温度初始值,是导致近年来渤海连续多年夏季高温现象的主要因素。春季升温受春季云量减少和短波辐射增强的影响。渤海春夏季水体变暖,尤其是连续多年的温度升高,对浮游植物群落结构、渔业、水母暴发以及整个生态系统有重要影响。 |
| 关键词: SST 夏季高温 春季热量累积 渤海 |
| DOI：10.11693/hyhz20210900208 |
| 分类号:P734 |
| 基金项目:国家自然科学基金项目,41806018号,41876018号;天津自然科学基金项目,19JCZDJC40600号。 |
附件 |
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| SUMMER HIGH TEMPERATURE PHENOMENON AND ITS MECHANISMS IN THE BOHAI SEA FROM 2013 TO 2019 |
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GUO Shi-An1, ZHANG Hai-Yan1, WEI Hao1, ZHAO Liang2
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1.School of Marine Science and Technology, Tianjin University, Tianjin 300072, China;2.College of Marine and Environmental Sciences, Tianjin University of Science and Technology, Tianjin 300457, China
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| Abstract: |
| In the context of global warming, the average temperature increase in the upper ocean will likely cause more frequent extreme high temperature events. The ecosystem of the Bohai Sea will face greater risks and challenges. Understanding the progression of extreme high temperature events will provide strong support for coping with future climate change and disaster prevention and mitigation. A high temperature regime shift of August SST since 2013 was revealed based on long term observations and remotely sensed data, and factors influencing summer warming since 2013 were analyzed based on a physical model ROMS. The SST in August from 2013 to 2019 was 1.37 ℃ higher than that from 1994 to 2012. In terms of spatial distribution, relatively higher SST distributed mainly in the three bays and the central bank of the Bohai Sea. In terms of vertical structure, the temperature of the upper mixing layer in summer overall increases; the thickness of the upper mixing layer becomes thinner; the pycnocline becomes shallower; surface-bottom temperature difference becomes larger, and the stratification intensity increased by about 17.5% after 2013. The warming phenomenon in the Bohai Sea generally exists in spring and summer after 2013. The warming amplitude shows a linear increase trend in spring, but remains relatively stable in summer. The heat accumulation in spring provides a relatively high initial value for summer warming, which is the key factor for high temperature phenomenon in summer for years in the Bohai Sea. The temperature rise in spring is closely influenced by the decrease of cloud cover and the increase of short-wave radiation in spring. The warming in spring and summer in the Bohai Sea, especially the continuous warming for years, has important impacts on phytoplankton community structure, harmful algae blooms such as red tide and brown tide, the growth of living organisms in marine ranching and aquaculture area, and even the whole ecosystem. |
| Key words: sea surface temperature(SST) summer high temperature heat accumulation in spring the Bohai Sea |
