E4 DO [mg l-1]

Mean of 4 sampling stations, 1981-1990
Depth [m]  Jan    Feb    Mar    Apr    May    Jun    Jul    Aug    Sep    Oct    Nov    Dec
 Surface   9.0    8.9    9.2    9.4    9.8    9.6    9.8    9.8   10.0    9.6    7.9    8.3