南海北部表层硝酸盐浓度反演研究

Research on nitrate concentrations of sea surface by remote sensing in the Northern South China Sea

研究首次利用南海北部船基观测数据资料建立硝酸盐和海表温度的关系,然后通过MODIS-SST资料与现场海表温度比较后进行了订正。利用订正后的数据表明南海北部的表层硝酸盐和海表温度之间存在显著的负相关关系(R2=0.7126)。结合海表硝酸盐和海表温度的关系式,利用遥感海表温度的8 d平均值和月平均值估测了南海北部的表层硝酸盐浓度,8 d平均海表硝酸盐浓度值范围为0～3.3167μM,月平均值为0～2.0590μM,该值与现场监测数据及历史资料均一致。

The relationship of nitrate and sea surface temperature（SST） was firstly established by using the observed data of the northern South China Sea.The validity of the in situ data was also examined by the data from MODIS-SST.The adjusted data demonstrated a negative relationship between the nitrate and sea surface temperature（R2=0.7126）.The 8-day and monthly composite SST values by remote sensing have been used to estimate the nitrate concentration of sea surface in the South China Sea.The 8-day composite sea surface concentration ranged from 0 to 3.3167 μM,and monthly composite from 0 to 2.0590 μM.The estimated nitrate concentration in the South China Sea was exactly in accord with the in situ and historical data.