Impact of Satellite Data Assimilation in Atmospheric Reanalysis on the Marine Wind and Wave Climate
Impact of Satellite Data Assimilation in Atmospheric Reanalysis on the Marine Wind and Wave Climate
复制标题
大气再分析中卫星资料同化对海洋风浪气候的影响
DOI：
10.1175/jcli-d-16-0056.1
复制
发表时间：
2016
影响因子：
4.9
通讯作者：
Wataru Sasaki
中科院分区：
文献类型：
--
作者：
Wataru Sasaki;Wataru Sasaki
这项研究调查了将卫星数据纳入大气再分析对海洋表面风和波浪趋势的影响。两个实验进行了使用数值波浪模型迫使近地面风：一个来自日本55年再分析（JRA-55;实验A），另一个来自JRA-55只同化常规观测（JRA-55 C;实验B）。结果表明，1959 ~ 2012年，卫星资料同化降低了中纬度北太平洋和澳大利亚以南南大洋（30° ~ 60 ° S）波能通量（WEF）年平均值的上升趋势。研究还发现，20世纪90年代中期以后，散射计风的同化降低了中纬度北太平洋的近地面风速，导致1959 - 2012年WEF呈降低趋势。相比之下，1973-94年卫星辐射的同化增加了澳大利亚南部南大洋的近地表风速，而20世纪90年代中期之后散射计风的同化降低了风速。后者导致了1959年至2012年澳大利亚南部世界经济论坛的减少趋势。
This study investigated the impact of assimilating satellite data into atmospheric reanalyses on trends in ocean surface winds and waves. Two experiments were performed using a numerical wave model forced by near-surface winds: one derived from the Japanese 55-year Reanalysis (JRA-55; experiment A) and the other derived from JRA-55 using assimilated conventional observations only (JRA-55C; experiment B). The results showed that the satellite data assimilation reduced upward trends of the annual mean of wave energy flux (WEF) in the midlatitude North Pacific and southern ocean (30°–60°S), south of Australia, from 1959 to 2012. It was also found that the assimilation of scatterometer winds reduced the near-surface wind speed in the midlatitude North Pacific after the mid-1990s, which resulted in the reduced trend in WEF from 1959 to 2012. By contrast, assimilation of the satellite radiances for 1973–94 increased near-surface wind speed in the southern ocean, south of Australia, whereas the assimilation of the scatterometer winds after the mid-1990s reduced wind speed. The latter led to the reduced trend in WEF south of Australia from 1959 to 2012.