大西洋热盐环流年代际变化机制研究 Ⅰ.气候模式的建立和验证

Study on mechanism of interdecadal Atlantic thermohaline circulation variability I.Climate model development and verification

大气环流与热盐环流（THC）变化之间的因果关系,是海气相互作用研究领域的一个悬而未决的问题。本文为研究大西洋热盐环流的年际和年代际变化机制以及北大西洋海气要素对热盐环流年代际振荡的响应过程,以德国Max-Planck气象研究所的最新大气海洋环流模式（ECHAM5/MPI-OM）为基础,构建了重点针对北大西洋的海气耦合气候模式。利用此海气耦合气候模式,首先进行了CO2浓度固定在1860年前工业化以前水平-280μl/m3（ppmv）的500 a的数值模拟控制试验,然后以1860—2000年间的实测和替代资料反演所得CO2浓度为强迫进行了气候回报试验。依照观测资料和再分析数据集对气候模式回报的基本环流结构、深层水形成过程以及热盐环流和水团的空间结构进行了系统验证和分析。结果表明该气候模式具有相当的气候变化模拟能力,为后续的相关研究奠定了基础。

The causality between atmospheric circulation and thermohaline circulation （THC） is an open question in the field of air-sea interaction. For studying the variations of the Atlantic THC and its thrown the response of ocean and atmosphere under the period of inter-decadal Oscillation, based the model of ECHAMS/MPI-OM from Max-Planck Institute, An advanced climate Atlantic ocean-atmosphere coupled model was newly developed. The model is run by using the CO2 concentration of 280 ul/m3 which is fixed at pre-industrial level before 1 860 first. The numerical simulation time is 500 years. After that, the simulation for validation is forced by the COz concentration which is from observation and reanalysis data in the period of 1860 to 2000. The basic current circulation structures, the processes that shaped deep water, the spatial structure of the THC and water masses from the model result are all supported by observations and recent studies. The result shows that the climate model has a considerable capacity for simulating climatic changes. This work has laid the groundwork for the relevant future studies.