Forel-Ule indices observed during Maria S. Merian cruise MSM21/3 (ARCHEMHAB)

Visual inspection by 2 different observers using Forel-Ule Solutions prepared by Imke Mörking.由2名不同观察者使用Imke Mörking配制的福勒-乌勒标准溶液（Forel-Ule Solutions）开展目视检测。