Hourly sea surface temperature (SST) retrieved from Himawari-8 by the Japan Aerospace Exploration Agency (H8-SST/JAXA, latest version 1.2) is becoming an important data source for data merging as well as for resolving diurnal variation (DV). However, the spatial and temporal variation of the errors for the full disk is still unclear. In this article, two years of H8-SSTs/JAXA are validated against in situ measurements from iQuam2. In general, H8-SSTs/JAXA shows small biases between −0.11 and −0.03 K with root mean square error (RMSE) between 0.58 and 0.73 K. The spatial distributions of the errors reveal the following patterns: 1) a small median bias close to 0.1 K and RMSE of 0.4–0.6 K comparing to drifters are found at satellite zenith angle (SZA) 0°–35°; 2) negative biases (∼−0.3 K) are detected at SZA s 35°–58°; and 3) larger positive biases exceeding 0.3 K are also found along the viewing boundaries. The temporal variations of the errors show that 1) there is no prominent seasonal variation; 2) the amplitude of the DV of the errors is only ∼0.1 K for the statistical of all matchups, and 3) the maximum errors appears in the morning rather than in the noon. The statistics will be used in future work for DV analysis and merging purposes.

中文翻译：

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JAXA 验证来自 Himawari-8 的海面温度

日本宇宙航空研究开发机构（H8-SST/JAXA，最新版本1.2）从Himawari-8 检索的每小时海面温度（SST）正在成为数据合并和解决日变化（DV）的重要数据源。然而，全盘错误的空间和时间变化仍不清楚。在本文中，针对 iQuam2 的原位测量验证了两年的 H8-SST/JAXA。一般来说，H8-SSTs/JAXA 显示出 -0.11 和 -0.03 K 之间的小偏差，均方根误差 (RMSE) 在 0.58 到 0.73 K 之间。误差的空间分布显示以下模式：1) 小中值偏差接近在卫星天顶角 (SZA) 0°–35° 处发现与漂移器相比，0.1 K 和 RMSE 为 0.4–0.6 K；2) 在 SZA s 35°–58° 处检测到负偏差 (∼-0.3 K)；3) 沿观察边界也发现了超过 0.3 K 的更大的正偏差。误差的时间变化表明：1）没有明显的季节性变化；2）对于所有比赛的统计，误差的DV幅度仅为~0.1 K，并且3）最大误差出现在早上而不是中午。统计数据将用于未来的 DV 分析和合并工作。