本文介绍了国家气候中心发展的一个全球海洋碳循环环流模式,并分析评估了该模式的基本性能.该模式是在美国地球物理流体动力学实验室(GFDL,Geophysical Fluid Dynamics Laboratory)的全球海洋环流模式MOM4(Modular Ocean Model Version 4)基础上发展的一个垂直方向40层、包含生物地球化学过程的全球三维海洋碳循环环流模式,简称为MOM4_L40(Modular Ocean Model Version 4 With 40 Levels).该模式在气候场强迫下长期积分1000年,结果分析表明,与观测相比,模式较好地模拟了海洋温度、盐度、总二氧化碳、总碱、总磷酸盐的表面和垂直分布特征.模拟的海洋总二氧化碳分布与观测基本相符,表层为低值区,其下为高值区,高值区域位于10°S60°N之间,但2000m以上模拟值较观测偏小,2000m以下模拟值较观测偏大.总体来说,MOM4_L40模式是一个可信赖的海洋碳循环过程模拟研究工具.
英文摘要:
Since the late twentieth century,global warming has become one of the increasingly serious ecological and environmental problems.While one of the important reasons for global warming is the greenhouse effects caused by the increases of atmospheric carbon dioxide(CO_2) concentration.The ocean absorbing carbon dioxide plays a crucial role in the global carbon cycle. A global oceanic carbon cycle circulation model developed by National Climate Center of China Meteorological Administration is introduced and its performances are analyzed and evaluated. The oceanic carbon cycle model is developed on the basis of the global oceanic general circulation model Modular Ocean Model version 4 (MOM4)of Geophysical Fluid Dynamics Laboratory(GFDL)of the United States.It has 40 z-levels in the vertical direction and 3-dimension oceanic biogeochemistry processes,so it is named as MOM4_L40 for short.This model is integrated for 1000 years under climate force fields to simulate the natural distribution of temperature,salinity,carbon,and nutrient in the ocean.The simulations are analyzed and compared with observations so as to evaluate the basic capability of the model.From the modeling experiments and analyses,some major outcomes are obtained as followings:(1) Simulations of the vertical profiles of the global and regional mean temperature,salinity,carbon, and nutrients agree wellwith observations.(2)The model reproduces well the observational features of sea surface temperature,salinity,carbon,and nutrients.(3)The high values of observed and simulated CO_2 partial pressure differences are mainly located in the vicinity of the equatorial Pacific,the tropical Atlantic Ocean,and Bering Strait.The low valuesare mainly located in the middle latitudes of Pacific,Atlantic,and Indian Ocean,especially in the North Pacific,North Atlantic,and South Atlantic.