Float Lifetime

 

The average life of the latest model APEX Argo floats are around 3.7 years or approximately 135 cycles. These statistics are for floats with the standard alkaline battery configuration from an analysis by Kobayashi et al (2009). To read more, download the paper here. In the Australian Argo program we deploy our floats with a combination of lithium and alkaline battery packs which extends float lifetime. Our floats are lasting around 7 years and we have several floats that are approaching their 9th birthday and are still returning good data. Data measured by Argo float 5900032 is shown below as an example. These long time series incorporate around 300 profiles. 

 

Time series from a long lived float for temperature with depth (above) and salinity with depth (below)