Float 3900121 spent 700 days in the low salinity regionof the subtropical eastern South Pacific. An initial westwardexcursion during the first 100 days was followed by a returnto the original launching region. Based on theWOA data thisshould have resulted in a rise and fall of the AAIW salinityminimum during the first 150 days. The Argo observationsshow several short-lived events of higher AAIW salinity duringthat period, which is dominated by AAIW salinities below34.27. Agreement between the WOA field and the floatobservations is reached after the first 250 days. This suggeststhat in 2004 the region of AAIW salinities <34.27 reachedfurther west than indicated by the WOA field and that it wasbounded by a rather sharp gradient, which was encounteredby the float on several occasions during the first 150 days ofits life.
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