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虽然地球海底地热通量在全球热能收支平衡中所占的比例非常低,在目前的海洋气候模式开发中也并没有将其包含在内,但是由于海底地热通量可以持续改变海洋的浮力而影响海水层结,进而影响海洋温度分布以及环流等海洋水文要素,并且可以进一步影响海水的化学性质、碳氮的分布循环以及生物分布等,因此其对海洋环流和气候变化长期影响的潜在可能性仍不能完全排除。在通用地球系统耦合模式(CESM)的基础上,通过在全球大洋中脊区域持续加入1 W/m2的地热通量的方式运行了长达5 000年的数值模拟实验,模式结果显示:海底地热通量对深层海洋的物理性质和全球海洋环流的长期影响是不可忽略的;受地热通量的局地加热效应影响,大洋深层3 000~3 500 m总体升温约0.4℃;在南大洋和北大西洋的深层水形成区域,海洋深层的增温信号可以影响到表层海洋。北大西洋深层水和南极底层水形成增强,并且模拟的北大西洋深层水的深度加深,更符合观测结果。
Although the Earth’s seabed geothermal flux accounts for a very low percentage of the world’s energy budget, it is not included in the current development of marine climate models. However, because the seabed geothermal fluxes can continuously change the buoyancy of the oceans, Affect the sea-water stratification, and then affect the marine hydrological elements such as ocean temperature distribution and circulation, and may further affect the chemical properties of seawater, the distribution cycle of carbon and nitrogen, and the biodistribution. Therefore, its potential for long-term impacts on ocean circulation and climate change Still can not be completely ruled out. Based on the Common Earth System Coupling Model (CESM), up to 5,000 years of numerical simulations were carried out by continuing to add 1 W / m2 of geothermal flux to the mid-ocean ridges region. The results of the model show that the seabed geothermal The long-term effects of fluxes on the physical properties of the deep ocean and the global ocean circulation can not be neglected. Due to the local heating effect of the geothermal flux, the general temperature increase of about 3000-3200 m in the deep ocean is about 0.4 ° C. In the southern ocean and north The formation of deep water in the Atlantic Ocean, the ocean deep warming signal can affect the surface ocean. The formation of deep water in the North Atlantic and the Antarctic bottom water is enhanced, and the depth of the simulated deep water in the North Atlantic deepens more in line with the observations.