The ratio between the sea fog period and the total summer period and ship-bsead observation data

The ratio between the sea fog period and the total summer period (Rsf) We use two methods to judge the sea fog in every year, one is RH (of 1000hPa) > 95% and TD ranging within 0-2 K, the other is CBH and TP to be <100 m and <0.25 mm, respectively, the qualifying times divided by the total time, which is the Rsf-K1 and Rsf-K2 of this data set. The spatial range is 55°S~80°S,-180°~180°,See lat.txt and lon.txt for specific latitude and longitude. We calculated the average annual ratio of sea fog for a total of 41 years (1979~2019). _____ We uploaded ten years of ship-based observations, from the 30th (2013) to the 39th (2023) China Antarctic Research Expedition (CHINARE), have been taken on an ice-breaker and scientific research vessel, “Snow Dragon.”海雾时长与夏季总时长的比值（Rsf） 本研究采用两种方法逐年判定海雾：其一为1000百帕（1000hPa）相对湿度（Relative Humidity, RH）大于95%，且露点差（Temperature Dewpoint Depression, TD）处于0~2开尔文（K）之间；其二为云底高度（Cloud Base Height, CBH）小于100米，且总降水量（Total Precipitation, TP）小于0.25毫米。将符合海雾判定条件的时长除以该年夏季总时长，分别得到本数据集的Rsf-K1与Rsf-K2。 本数据集的空间范围为南纬55°~80°、西经180°~东经180°，具体经纬度信息详见lat.txt与lon.txt文件。 本数据集计算了1979年至2019年共计41年的年平均海雾比值。 ———— 本次上传了2013年（第30次）至2023年（第39次）中国南极考察（CHINARE）共计十年的船基观测数据，观测搭载于破冰科考船"雪龙"号（Snow Dragon）之上。