基于耦合气候系统模式的中全新世黄、东海海表通量分析

对中全新世(6,ka时期)海洋和气候的研究可加深人们对现阶段气候变化和海洋环境的认识,为预测未来海洋与气候环境变化提供一个重要参照.文章分析一个耦合气候系统模式FGOALS-s2.0的模式结果,首先对其工业革命前(0,ka时期)东亚地区夏季降水及冬、夏季10,m风场的模拟结果进行评估,然后进一步对中全新世和工业革命前黄、东海海表大气强迫的季节变化进行了对比.结果显示:模式模拟出0,ka时期东亚夏季降水从东南洋面至西北内陆减少的空间分布特点,冬、夏季10,m风场亦与观测大体一致;6,ka时期夏季,黄、东海风速较0,ka时期增大约0.8,m/s,16%左右;黄海风应力旋度值为正,东海为负,与0,ka时期相比旋度绝对值均增大;同时,两海区接收的太阳短波辐射较0,ka时期均增加,短波辐射的差异是中全新世夏季黄、东海海表的净热吸收增加的主要因子.6,ka时期冬季,黄、东海北风加强,东海增加量在0.5~1.0,m/s,幅度约为10%,较黄海更为明显;两海区在冬季的净热释放也较0,ka时期增大,东海释放更甚;冬季黄、东海风应力旋度较0,ka时期则无太大差别.研究表明,由于6,ka时期太阳辐射季节循环的改变,造成了黄、东海夏季风增强,海表净热通量也发生相应变化,该时期大气强迫场的变化可能会使黄、东海表层水温分布趋势发生较大改变,进而影响陆架环流格局.

Analysis of Sea Surface Fluxes at the Yellow Sea and East China Sea in Mid-Holocene Based on a Flexible Global Ocean-Atmosphere-Land System Model

It is significant to study the variations of ocean and climate between mid-Holocene（6,ka）and the present soas to provide reference for future climate prediction. Based on the results of a coupled ocean-atmosphere model FGOALS-s2.0, East Asian monsoon rainfall as well the surface wind in both summer and winter of the pre-Industrial（0,ka）are evaluated. And then atmospheric forcing on the Yellow Sea（YS）and the East China Sea（ECS）in winter and summer of 0,ka and 6,ka were analyzed respectively and also compared. It was found that East Asian summer rainfall of 0 ka reduced from southeast to northwest as observations showed and the surface wind field was also approximately consistent with observations. The wind speed of YS and ECS in summer of 6 ka was about 16%（0.8,m/s）higher than that of 0 ka. The wind stress curl in YS was positive and in ECS negative in summer,both of which were higher than those of 0 ka. Additionally,solar radiation in mid-Holocene summer in these two areas also increased compared with that of 0 ka. The difference of shortwave radiation is＆amp;nbsp;the major factor that made the net heat flux in mid-Holocene summer increase. As to the winter time,northerly wind in mid-Holocene was much stronger. The increase of the wind speed in ECS was 0.5-1.0,m/s,higher than that on the Yellow Sea. The net heat release in the two areas increased in 6 ka winter. There was no obvious difference in the wind stress between the winter of 0 ka and 6 ka. This research suggests that the seasonal variation cycle of the solar radiation in 6 ka led to both the surface wind increase in YS and ECS and the changes of sea surface net heat flux. All of these changes in atmospheric forc-ing might have influenced the SST of YS and ECS in mid-Holocene,and also affected the continental shelf circulation.