海洋热含量对太阳总辐射11年周期变化的响应

摘要

地球接收到的太阳总辐射（TSI）存在一个约11年的微小周期变化，该变化可能对地球气候系统造成影响。众多研究表明，局部海域海表面温度、海洋热含量的平均时间序列与TSI的11年周期变化有显著的相关性。但海洋对太阳辐射11年周期的响应并非空间均匀的，响应机制也不确定。这里采用合成平均差方法，根据太阳活动的高值年和低值年，对美国国家海洋和大气管理局(NOAA)和日本气象厅（JMA）的全球上700m热含量进行合成分析。两套数据产品得到的海洋热含量对太阳辐射的响应空间模态基本一致。在太平洋分别选取其中一个正响应区域和一个负响应区域，发现这两个区域的上700m热含量确实存在较明显的11年周期变化。%The total solar irradiance (TSI) impinging on the Earth has a slight variation of approximate 11-year period, which is expected to affect the variability of the Earth climate system. Researches have found correlations between sea surface temperature or ocean heat content of local ocean basins and the 11-year TSI time series. However, the response of the upper ocean to the 11-year solar cycle is not spatially uniform, and the response mechanism is still open to debate. No region has even been identiifed to have a clear 11-year variation in its sea surface temperature or ocean heat content yet. We analysed the ocean heat content (OHC) in upper-700-m of the global ocean from NOAA and JMA datasets, respectively. Composite mean difference method is used to obtain the response pattern of OHC to the 11-year solar activity. The two datasets give rather similar results. We select a positive response area and a negative one in the Paciifc and ifnd a signiifcant 11-year variation in the upper 700-m OHC in these two regions.