辐射强迫增强后黑潮延伸体混合层季节变化提前及其对春季水华的影响
发布时间：2019-05-23 13:34
【摘要】：在当前气候态下的黑潮延伸体海区,混合层在一月到四月都较深。本文使用耦合模式比较计划(CMIP5)的15个耦合模式的数据,研究混合层深度对于辐射强迫增强的响应,并深入讨论了形成这样变化的原因,同时对由于混合层深度的变化而造成的春季水华发生时间的改变进行了研究。得到如下具有一定创新性的成果：1、根据CMIP5模式数据的多模式平均的结果,在黑潮延伸体海区,21世纪的混合层深度较当前气候态下有明显的变浅,特别是三月和四月,变浅最深的区域可以达到30m。在三月份,混合层深度变浅的区域在当前气候态下混合层深度的锋面区,呈现西南-东北的条带状分布。在四月份,混合层深度变浅的更为明显,并且分布在混合层深度的大值中心区域。2、根据CMIP5模式数据的多模式平均的结果,在辐射强迫增加后,三月和四月的黑潮延伸体海区的海水在南部吸热增多(约15 w/m2),导致混合层变浅,但是无法解释三月和四月混合层深度变浅分布上的差异。温度平流的变化是混合层在辐射强迫增强后产生变浅现象的主要原因,在三月和四月温度平流变化的分布都与混合层深度变化的分布相一致。通过试验表明,由于混合层锋面区的背景流场是自西向东的东向流,辐射强迫增强后海水增暖的不一致性即西高东低,产生暖平流,是导致温度平流这样变化的原因。导致海表面温度增暖不一致的原因可能是风场的变化或者是流场的变化,还需要进一步的研究。3、通过使用4个CMIP5的耦合模式数据,验证了Sverdrup的春季水华理论在黑潮延伸体海区的合理性。通过比较当前气候态和辐射强迫增强,发现春季水华发生时间有明显的提前,大概在2-20天左右,并且变化时间随着经纬度的变化而发生改变。4、15个模式中有9个模式混合层变化的情况与多模式平均的结果相一致,利用模式间经验正交分解的结果反演物理量,得到温度平流的模式间差异导致了混合层深度的模式间差异,海表面温度的模式间差异导致了温度平流的模式间差异,加强了结论。以上分析证明了混合层深度在辐射强迫增强后会发生变浅,主要发生在三月和四月,并且存在季节差异,这样的差异是由于海洋增暖不一致导致的温度平流的差异,而混合层的变浅会导致春季水华的提前发生,影响生物学过程。
[Abstract]:In the current climatological Kuroshio extension area, the mixed layer is deeper from January to April. In this paper, the response of the depth of the mixed layer to the enhancement of radiation forcing is studied by using the data of 15 coupling modes of the Coupling Model comparison Plan (CMIP5), and the causes of this change are discussed in detail. At the same time, the change of Shui Hua occurrence time in spring caused by the change of mixed layer depth is studied. The following innovative results are obtained: 1. According to the multi-mode average results of CMIP5 model data, in the Kuroshio extension sea area, the depth of the mixed layer in the 21st century is obviously shallower than that in the current climatological state, especially in March and April. The deepest area can reach 30 m. In March, the region where the depth of the mixed layer becomes shallower presents a banded distribution from southwest to northeast in the front area of the depth of the mixed layer in the current climatological state. In April, the depth of the mixed layer becomes shallower and is distributed in the large central region of the depth of the mixed layer. 2. According to the results of the multi-mode average of the CMIP5 model data, after the radiation forcing increases, The sea water in the Kuroshio extension area in March and April increased in the southern endothermic area (about 15 w/m2), which led to the shallower mixed layer, but could not explain the difference in the distribution of the depth of the mixed layer between March and April. The change of temperature advection is the main reason for the shallower phenomenon of the mixed layer after the enhancement of radiation forcing. The distribution of temperature advection in March and April is consistent with the distribution of the depth of the mixed layer. The experimental results show that because the background flow field in the front area of the mixed layer is an eastward flow from west to east, the inconsistency of seawater warming after enhanced radiation forcing is high in the west and low in the east, resulting in warm advection, which is the cause of the change of temperature advection. The inconsistency of sea surface temperature may be due to the change of wind field or flow field, and further research is needed. 3, by using the coupling mode data of four CMIP5, The rationality of Sverdrup's spring Shui Hua theory in the Kuroshio extension area is verified. By comparing the current climatic state with the enhancement of radiation forcing, it is found that the occurrence time of Shui Hua in spring is obviously ahead of schedule, about 2 脳 20 days. And the change time changes with the change of longitude and latitude. 4, 9 of the 15 models are consistent with the results of multi-mode average, and the physical quantities are inversed by the results of empirical orthogonal decomposition between models. It is obtained that the difference of temperature advection mode leads to the difference of mixed layer depth, and the difference of sea surface temperature mode leads to the difference of temperature advection model, which strengthens the conclusion. The above analysis shows that the depth of the mixed layer will become shallower after the enhancement of radiation forcing, mainly in March and April, and there are seasonal differences, which are due to the difference of temperature advection caused by the inconsistency of ocean warming. The shallower mixed layer will lead to the occurrence of Shui Hua in spring and affect the biological process.
【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X52
[Abstract]:In the current climatological Kuroshio extension area, the mixed layer is deeper from January to April. In this paper, the response of the depth of the mixed layer to the enhancement of radiation forcing is studied by using the data of 15 coupling modes of the Coupling Model comparison Plan (CMIP5), and the causes of this change are discussed in detail. At the same time, the change of Shui Hua occurrence time in spring caused by the change of mixed layer depth is studied. The following innovative results are obtained: 1. According to the multi-mode average results of CMIP5 model data, in the Kuroshio extension sea area, the depth of the mixed layer in the 21st century is obviously shallower than that in the current climatological state, especially in March and April. The deepest area can reach 30 m. In March, the region where the depth of the mixed layer becomes shallower presents a banded distribution from southwest to northeast in the front area of the depth of the mixed layer in the current climatological state. In April, the depth of the mixed layer becomes shallower and is distributed in the large central region of the depth of the mixed layer. 2. According to the results of the multi-mode average of the CMIP5 model data, after the radiation forcing increases, The sea water in the Kuroshio extension area in March and April increased in the southern endothermic area (about 15 w/m2), which led to the shallower mixed layer, but could not explain the difference in the distribution of the depth of the mixed layer between March and April. The change of temperature advection is the main reason for the shallower phenomenon of the mixed layer after the enhancement of radiation forcing. The distribution of temperature advection in March and April is consistent with the distribution of the depth of the mixed layer. The experimental results show that because the background flow field in the front area of the mixed layer is an eastward flow from west to east, the inconsistency of seawater warming after enhanced radiation forcing is high in the west and low in the east, resulting in warm advection, which is the cause of the change of temperature advection. The inconsistency of sea surface temperature may be due to the change of wind field or flow field, and further research is needed. 3, by using the coupling mode data of four CMIP5, The rationality of Sverdrup's spring Shui Hua theory in the Kuroshio extension area is verified. By comparing the current climatic state with the enhancement of radiation forcing, it is found that the occurrence time of Shui Hua in spring is obviously ahead of schedule, about 2 脳 20 days. And the change time changes with the change of longitude and latitude. 4, 9 of the 15 models are consistent with the results of multi-mode average, and the physical quantities are inversed by the results of empirical orthogonal decomposition between models. It is obtained that the difference of temperature advection mode leads to the difference of mixed layer depth, and the difference of sea surface temperature mode leads to the difference of temperature advection model, which strengthens the conclusion. The above analysis shows that the depth of the mixed layer will become shallower after the enhancement of radiation forcing, mainly in March and April, and there are seasonal differences, which are due to the difference of temperature advection caused by the inconsistency of ocean warming. The shallower mixed layer will lead to the occurrence of Shui Hua in spring and affect the biological process.
【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X52
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