This study evaluated the effects of sea surface temperature (SST) resolution on dynamically downscaled daily surface air temperature (Tsrf) in the Kanto region during early summer. Two downscaling experiments and one additional experiment were conducted using different SST datasets for the months of June and July over a 10-year period. The results demonstrated that the Tsrf difference in the Kanto region between the high-resolution SST experiment (Run-H) and the low-resolution SST experiment (Run-C) correlated positively with the difference in surrounding SST. The impact of SST difference depended on the wind direction and speed. By comparing the results with observations at meteorological stations, the number of days with warm Tsrf bias in Run-C significantly reduced in Run-H, but the number of days with cold Tsrf bias remained steady. These results suggest that SST resolution influences the downscaled Tsrf reproducibility over land, and it is worthwhile to pay attention to coastal SST.

这项研究评估了夏季初关东地区海表温度（SST）分辨率对动态缩减的日表面气温（Tsrf）的影响。使用不同的SST数据集在10年期间的6月和7月进行了两次降尺度实验和一项其他实验。结果表明，高分辨率SST实验（Run-H）和低分辨率SST实验（Run-C）在关东地区的Tsrf差异与周围SST的差异呈正相关。SST差异的影响取决于风向和风速。通过将结果与气象站的观测结果进行比较，Run-C中具有Tsrf偏爱的天数在Run-H中显着减少，但是具有Tsrf偏冷的天数却保持稳定。