Nitrate, nitrite, phosphate, silicate and ammonium nutrient data have been collected since 2000 at station L4. A longer (since 1934), now depth resolved, time-series has been collected at station E1. These data are often available on the day of collection
The depth resolved temperature and salinity time-series at E1, started in 1903, is one of the longest in the world. CTD data is available often on the day of collection from stations L4 and E1. Data also included in these profiles are oxygen, fluorescence and PAR.
Electronic and laboratory based bio-optical measurements have been taken by PML at stations L4 and E1 over the past decade in support of satellite algorithm development work. Measurements include Inherent Optical Properties and radiometry.
CHN analysis has been carried out at L4 since 1992, with the analysis being carried out using a Thermoquest FlashEA 1112 elemental analyzer since 2000.
RV Quest Underway System
The R.V. Plymouth Quest is fitted with an underway suite of sensors, which continuously sample from the vessels non-toxic underway water supply. These data can be downloaded and visualised in Google Earth.