A Study on the Characteristics of Water Temperature using Infrared Sensor and In-situ data at the Socheongcho Ocean Research Station

Abstract

Monitoring Sea surface temperature (SST) is one of the important factor to understand marine environmental change. In this study, the seasonal and temporal characteristics of water temperature were analyzed using an infrared camera that measures the skin sea surface temperature (skin SST) of the Socheongcho Ocean Research Station (SORS). Also, in order to analyze the effects on various environmental factors, CTD data of surface buoy measuring SST of 1m depth and various atmospheric data in SORS were used. The water temperature observation data were used after removing the error value through quality control (QC) procedure. The diurnal variation amplitudes of the IR SST from April to August were 1.09℃~3.46℃, which were larger than other periods with 0.33℃~0.89℃ range. There were some days in which the IR SST was lowered even though the solar radiation increased during the daytime. This was because the air temperature had been lowered at that time. IR SST had a standard deviation of 1.11℃ with the SST of surface buoy because the different observation depth. This study shows that when analyzing the observed water temperature using the IR sensor, it is necessary to calibrate it by comparing the effect on the atmosphere and the field observation data. It is expected that the IR SST data will be used as a calibration data to calculate the SST of the satellite with the IR sensor.sures the skin sea surface temperature (skin SST) of the Socheongcho Ocean Research Station (SORS). Also, in order to analyze the effects on various environmental factors, CTD data of surface buoy measuring SST of 1m depth and various atmospheric data in SORS were used. The water temperature observation data were used after removing the error value through quality control (QC) procedure. The diurnal variation amplitudes of the IR SST from April to August were 1.09℃~3.46℃, which were larger than other periods with 0.33℃~0.89℃ range. There were some days in which the IR SST was lowered even though the solar radiation increased during the daytime. This was because the air temperature had been lowered at that time. IR SST had a standard deviation of 1.11℃ with the SST of surface buoy because the different observation depth. This study shows that when analyzing the observed water temperature using the IR sensor, it is necessary to calibrate it by comparing the effect on the atmosphere and the field observation data. It is expected that the IR SST data will be used as a calibration data to calculate the SST of the satellite with the IR sensor.