Monterey Bay Aquarium Research Institute
Apex/ISUS Float List

A brief description of the floats that have been deployed. Access real time data here. Floats with adjusted and quality controlled data are shown with a QC in the file name. These adjusted data were adjusted by correcting oxygen data for sensor gain, and nitrate data for gain (rarely), sensor offset and sensor drift. Offset and drift were determined by comparison to 1000 m nitrate values in World Ocean Atlas 2009 at the location of each float profile. pH values were adjusted for sensor offset by comparison to hydrocast data at deployment.

Float Designation (WMO ID#) Dates Deployed Where

Link to Data File

These are tab delimited, ASCII text files in OceanDataView format. Files ending QC have been quality controlled for sensor offset, gain and drift.

Why?
5145MtyBay 9/17 to 9/21/2007 Monterey Bay A short test deployment of float 5145 to verify operation of ISUS. The float profiled twice each day for 5 days and was then recovered.
5145Hawaii
(5901468)

12/22/2007 to 10/2011

 

Hawaii Ocean Time series (HOT) station Planned four year deployment to assess long-term ISUS sensor performance. Low nitrate concentrations in surface waters near HOT will allow us to assess sensor drift over years. Float 5145 profiled once per day for the first 7 days and is now profiling every 5 days. The NO3 sensor stopped 9/2010 due to a software problem. The float was recovered 10/31/2011 to recalibrate the sensor.
5146SoOcean (5901492) 2/21/2008 to 3/2011 Southern Ocean on the CLIVAR I6S Line at 50 degrees S, which is southeast of Africa Seasonal consumption of nitrate during spring/summer phytoplankton blooms in the Southern Ocean tracks new primary production (NPP). Long-term measurements of nitrate will allow us to assess changes in NPP over interannual time scales.
5143StnP (5902128) 8/31/2008 to 8/2011 Ocean Station Papa at 50 North, 145 West in the Gulf of Alaska Seasonal consumption of nitrate during spring/summer phytoplankton blooms in the Subarctic North Pacific tracks new primary production (NPP). Long-term measurements of nitrate will allow us to assess changes in NPP over interannual time scales.
5426DrakePass (5902112) 1/7/2009 to present Drake Passage at 55 South, 80 West in the Southern Ocean Seasonal consumption of nitrate during spring/summer phytoplankton blooms in the Southern Ocean tracks new primary production (NPP). Long-term measurements of nitrate will allow us to assess changes in NPP over interannual time scales.
6391Bermuda (1901378) 10/12/2009 to present Bermuda Atlantic Time Series (BATS) station Four year deployment in the North Atlantic. This deployment will test the ability of the Apex/ISUS to resolve small nutrient injection events, which occur during deep winter mixing near BATS.
6401MtyBay

8/3/2009 to 8/6/2009

Monterey Bay A four day test deployment of float 6401 offshore of Monterey Bay. This is a modified Apex float that is designed to carry more biogeochemical sensors and to make sensor integration much easier. 6401 carries an ISUS nitrate sensor and an Aanderaa oxygen optode.
6401Hawaii (1901379)

11/6/2009 to present

Hawaii Ocean Time series (HOT) station Four year deployment to assess long-term ISUS sensor performance. Low nitrate concentrations in surface waters near HOT will allow us to assess sensor drift over years in extended Apex float design.
6891Hawaii (5903272)

Deployed May 22, 2010

Hawaii Ocean Time series (HOT) station Four year deployment to assess long-term ISUS sensor performance. Low nitrate concentrations in surface waters near HOT will allow us to assess sensor drift over years in extended Apex float design.
6400StnP (5903274) Deployed June 18, 2010 Ocean Station Papa at 50 North, 145 West in the Gulf of Alaska Four year deployment at Station Papa. This float will be our first to carry biooptical sensors (Wetlabs FLBB for chlorophyll fluorescence and optical backscattering, which is proportional to particle abundance), in addition to nitrate, oxygen and CTD.
6976Bermuda (5903377) November 12, 2010 Bermuda Atlantic Time Series (BATS) station Four year deployment in the North Atlantic. This deployment will test the ability of the Apex/ISUS to resolve small nutrient injection events, which occur during deep winter mixing near BATS.
6403Hawaii (5903385)

Deployed Jan. 09, 2011

Hawaii Ocean Time series (HOT) station Four year deployment to assess long-term ISUS sensor performance. Low nitrate concentrations in surface waters near HOT will allow us to assess sensor drift over years in extended Apex float design. The float array at Hawaii will allow meso-scale variability to be assessed.
6972StnP (5903405) Deployed Feb. 16, 2011 Ocean Station Papa at 50 North, 145 West in the Gulf of Alaska Four year deployment at Station Papa.
7564Arctic (5903592) Deployed Aug. 23, 2011 Greenland Sea between Greenland, Svalbard & Norway Four year deployment in the Greenland Sea region of the Arctic Ocean. This float is equipped with nitrate, oxygen and biooptics (Wetlabs FLBB for chlorophyll fluorescence and optical backscattering, which is proportional to particle abundance).
6966Hawaii Deployed Sept 1, 2011 Recovered Nov. 1, 2011 Hawaii Ocean Time series (HOT) station Four year deployment to assess long-term ISUS sensor performance. The ISUS in this system is produced by Satlantic and is the prototype for a commercial design. Note this float has an intermittent connection on the CTD and does not return all of the normal samples. It was recovered to repair the CTD.
6975Bermuda (5903594) October 5, 2011 Bermuda Atlantic Time Series (BATS) station Four year deployment in the North Atlantic. This deployment will test the ability of the Apex/ISUS to resolve small nutrient injection events, which occur during deep winter mixing near BATS.
7622Hawaii (5903611)

Deployed Nov. 2, 2011

Hawaii Ocean Time series (HOT) station Four year deployment to assess long-term SUNA nitrate sensor performance. SUNA is an external nitrate sensor designed by Satlantic with a different optical design than ISUS.
6967SoAtlantic (5903612) Deployed Dec. 11, 2011 South Atlantic Four year deployment in the South Atlantic/Southern Ocean north of the Polar Front. The float is equipped with biooptical sensors in addition to nitrate and oxygen.
6381ArabianSea (5903586) Deployed Dec. 16, 2011 Arabian Sea Four year deployment in the Arabian Sea over an intense oxygen minimum. The float will be used to study coupling between oxygen and denitrification The float is equipped with biooptical sensors in addition to nitrate and oxygen.
7601StnP (5903714) Deployed Feb. 18, 2012 Ocean Station Papa at 50 North, 145 West in the Gulf of Alaska Four year deployment at Station Papa.
0068RossSea (5903717) Deployed Feb. 20, 2012 In the Southern Ocean at the northern edge of the Ross Sea Four year deployment in the Southern Ocean. This float will be under ice in winter. It will avoid damage using ice detection software. Data will be returned when ice has melted.
6968SoOcn (5903718) Deployed March 6, 2012 In the Southern Ocean south of New Zealand Four year deployment in the Southern Ocean.
7552SoOcn (5903729) Deployed March 15, 2012 In the Southern Ocean southwest of Australia Four year deployment in the Southern Ocean.
7558ETNP (5903711) Deployed March 25, 2012 Eastern Tropical North Pacific Four year deployment in the Eastern Tropical North Pacific over an intense oxygen minimum. The float will be used to study coupling between oxygen and denitrification. The float is equipped with biooptical sensors in addition to nitrate and oxygen. The float was deployed by the NOAA ship Ka'imimoana
6960ETNP (5903742) Deployed March 25, 2012 Eastern Tropical North Pacific Four year deployment in the Eastern Tropical North Pacific over an intense oxygen minimum. The float will be used to study coupling between oxygen and denitrification. The float was deployed by NOAA Ship Ka'imimoana
8374HOT (5903741) Deployed March 27, 2012 Hawaii Ocean Time series (HOT) station This float was deployed with oxygen and an experimental pH sensor which failed.
7597Hawaii (5903753) Deployed May 23, 2012 Hawaii Ocean Time series (HOT) station Four year deployment to assess long-term ISUS sensor performance. The ISUS stopped after 1 profile due to unknown problems.
7593Hawaii (5903754) Deployed July 10, 2012 Hawaii Ocean Time series (HOT) station Four year deployment to assess long-term ISUS sensor performance. The ISUS in this system is produced by Satlantic and is the prototype for a commercial design.
7596Arctic (5903887) Deployed Aug. 20, 2012 Greenland Sea between Greenland, Svalbard & Norway Four year deployment in the Greenland Sea region of the Arctic Ocean. This float is equipped with nitrate, oxygen and biooptics (Wetlabs FLBB for chlorophyll fluorescence and optical backscattering, which is proportional to particle abundance).
7663Bermuda (5903892) August 23, 2012 Bermuda Atlantic Time Series (BATS) station Four year deployment in the North Atlantic. The nitrate sensor is a Satlantic ISUS. This deployment will test the ability of the sensor to resolve small nutrient injection events, which occur during deep winter mixing near BATS.
7672Hawaii (5903893) Deployed October 2, 2012 Hawaii Ocean Time series (HOT) station This is our first float with a Deep-Sea Durafet pH sensor. The pH sensor was modified from a standard Honeywell Durafet design to be pressure tolerant. This is the first test of a new pH sensor designed to monitor ocean acidity. There is an O2 sensor, but no nitrate sensor on this float.
7647CalCurrent (5904021) November 18, 2012 Station M in the California Current Four year deployment in the California Current. This deployment will observe seasonal variability in nutrient supply in the waters of the California Current.
7553SoPacific (5903755) November 23, 2012 South Pacific Four year deployment in the South Pacific. This region has the lowest chlorophyll concentrations and clearest water of the global ocean. Nitrate isdepleted to depths near 200 m.
0069Bermuda (5903890) November 29, 2012 Bermuda This is the original float 5145, which was recovered after a 3 year deployment near Hawaii. It was refurbished and redeployed at BATS.
7550BayofBengal (5903712) December 30, 2012 Bay of Bengal This float was deployed in the Bay of Bengal to provide a comparison to float 6381 in the Arabian Sea. Due to the very low density of surface water in the Bay of Bengal, this float won't profile much deeper than 700 meters.
6881StnP (5903891) Deployed Feb. 12, 2013 Ocean Station Papa at 50 North, 145 West in the Gulf of Alaska Four year deployment at Station Papa. This float has nitrate optics on the top end cap, but not in the pumped flow stream. This is an experiment to see how the flow stream impacts sensor fouling.
8497Hawaii (5904094) Deployed Feb. 15, 2013 Hawaii Ocean Time series (HOT) station Four year deployment to assess long-term ISUS sensor performance. The ISUS in this system is produced by Satlantic and is the commercial design.
7546Kuroshio (5904034) Deployed Feb. 28, 2013 in the Kuroshio Extension Region Four year deployment as part of an experiment planned by Steve Emerson and Steve Riser to study the processes that regulate pCO2 levels in the Kuroshio Extension Region.
7674Kuroshio (5904035) Deployed March 1, 2013 in the Kuroshio Extension Region Four year deployment as part of an experiment planned by Steve Emerson and Steve Riser to study the processes that regulate pCO2 levels in the Kuroshio Extension Region.
7619SoOcn (5904105) Deployed March 2, 2013 in the Southern Ocean south of Australia. Four year deployment in the Southern Ocean.
7620SoOcn (5904104) Deployed March 3, 2013 in the Southern Ocean south of Australia. Four year deployment in the Southern Ocean.
8486MtyBay (nnnnnn) Deployed April 29, 2013 Monterey Bay. Two day test deployment of a float that integrates the Deep-Sea Durafet pH sensor, ISUS nitrate sensor, Aanderaa oxygen optode and Wetlabs FLBB chlorophyll and backscatter sensor. This float is the prototype of the design proposed for a large Southern Ocean observing system. It will be recovered and sent to Hawaii for a long term deployment to test sensor performance and integration.
8486Hawaii (5904124) Deployed May 19, 2013 Hawaii Ocean Time series (HOT) station This float integrates the Deep-Sea Durafet pH sensor, ISUS nitrate sensor, Aanderaa oxygen optode and Wetlabs FLBB chlorophyll and backscatter sensor. This float is the prototype of the design proposed for a large Southern Ocean observing system. It has been deployed at Hawaii for a long term test to compare sensor performance with observations at the HOT station.
7641StnP (5904125) Deployed June 19, 2013 Ocean Station Papa at 50 North, 145 West in the Gulf of Alaska Four year deployment at Station Papa. The nitrate sensor on this float is a Satlantic SUNA.
7642NoPacific (5904127) Deployed July 6, 2013 Central North Pacific at 36 North, 158 West Four year deployment in the subtropical front region. This area sees relatively large seasonal changes in chlorophyll concentration.
7698NoPacific (5904128) Deployed July 15, 2013 Central North Pacific at 34 North, 145 West Four year deployment in the subtropical front region. This area sees relatively large seasonal changes in chlorophyll concentration.
7618CalCurrent (5904107) Deployed July 14, 2013 in the California Current off Southern California. Four year deployment in the California Current. This float is part of a growing array of sensors in the outer portion of the Current.
7615CalCurrent (5904108) Deployed August 16, 2013 over Axial Seamount off the Oregon Coast. Four year deployment in the California Current. This float is part of a growing array of sensors in the outer portion of the Current.
8514Hawaii (5904172) Deployed Sept. 14, 2013 Hawaii Ocean Time series (HOT) station This float integrates the Deep-Sea Durafet pH sensor, ISUS nitrate sensor, Aanderaa oxygen optode and Wetlabs FLBB chlorophyll and backscatter sensor.
0276NoAtlantic (nnnnnnn) Deployed Feb. 10, 2014 North Atlantic This is a Sea-Bird Navis float with SUNA nitrate sensor, SBE 63 oxygen sensor and MCOM optical sensor (Chlorophyll fluorescence, backscatter and CDOM). Temp, salinity, oxygen and optical properties are returned at 2 m vertical resolution. This float will observe the North Atlantic spring bloom over the next 4 years.
6091SoOcn (5904179) Deployed March 26, 2014 in the Southern Ocean. This is the first of 12 floats that will be deployed on the US Repeat Hydrography P16S cruise . Seven of the floats in the array will have Deep-Sea DuraFET pH sensors.
7557SoOcn (5904181) Deployed March 28, 2014 in the Southern Ocean. This is one of 12 floats that will be deployed on the US Repeat Hydrography P16S cruise . Seven of the floats in the array will have Deep-Sea DuraFET pH sensors. This float has nitrate, oxygen and optics only.
7567SoOcn (5904182) Deployed March 30, 2014 in the Southern Ocean. This is one of 12 floats that will be deployed on the US Repeat Hydrography P16S cruise . Seven of the floats in the array will have Deep-Sea DuraFET pH sensors. This float has nitrate, oxygen and optics only.
7613SoOcn (5904180) Deployed March 31, 2014 in the Southern Ocean. This is one of 12 floats that will be deployed on the US Repeat Hydrography P16S cruise . Seven of the floats in the array will have Deep-Sea DuraFET pH sensors. This float has nitrate, oxygen and optics only.
7614SoOcn (5904183) Deployed April 1, 2014 in the Southern Ocean. This is one of 12 floats that will be deployed on the US Repeat Hydrography P16S cruise . Seven of the floats in the array will have Deep-Sea DuraFET pH sensors. This float has nitrate, oxygen and optics only.
9091SoOcn (5904184) Deployed April 3, 2014 in the Southern Ocean. This is one of 12 floats that will be deployed on the US Repeat Hydrography P16S cruise . This float is equipped with a Deep-Sea DuraFET pH sensor, nitrate, oxygen and optical sensors.
9092SoOcn (5904185) Deployed April 7, 2014 in the Southern Ocean. This is one of 12 floats that will be deployed on the US Repeat Hydrography P16S cruise . This float is equipped with a Deep-Sea DuraFET pH sensor, nitrate, oxygen and optical sensors.
9031SoOcn (5904396) Deployed April 11, 2014 in the Southern Ocean. This is one of 12 floats that will be deployed on the US Repeat Hydrography P16S cruise . This float is equipped with a Deep-Sea DuraFET pH sensor, nitrate, oxygen and optical sensors.
9018SoOcn (5904186) Deployed April 13, 2014 in the Southern Ocean. This is one of 12 floats that will be deployed on the US Repeat Hydrography P16S cruise . This float is equipped with a Deep-Sea DuraFET pH sensor and Optode oxygen, but no nitrate or optics.
9095SoOcn (5904188) Deployed April 14, 2014 in the Southern Ocean. This is one of 12 floats that will be deployed on the US Repeat Hydrography P16S cruise . This float is equipped with a Deep-Sea DuraFET pH sensor, nitrate, oxygen and optical sensors.
9101SoOcn (5904187) Deployed April 18, 2014 in the Southern Ocean. This is one of 12 floats that will be deployed on the US Repeat Hydrography P16S cruise . This float is equipped with a Deep-Sea DuraFET pH sensor and Optode oxygen, but no nitrate or optics.
9254SoOcn (5904395) Deployed April 20, 2014 in the Southern Ocean. This is one of 12 floats that will be deployed on the US Repeat Hydrography P16S cruise . This float is equipped with a Deep-Sea DuraFET pH sensor, nitrate, oxygen and optical sensors.
0412Hawaii (nnnnnn) Deployed Nov. 3, 2014 Hawaii Ocean Time series (HOT) station This is a Sea-Bird Electronics Navis float with the Deep-Sea Durafet pH sensor, SBE 63 oxygen sensor and MCOM optical sensor (Chlorophyll fluorescence, backscatter and CDOM). Temp, salinity, pH, oxygen and optical properties are returned at 2 m vertical resolution above 1000 m depth.
0037SoOcn (5904480) Deployed Dec. 5, 2014 South Atlantic and across the Weddell Sea. This is one of 12 floats that will be deployed from the Polarstern. This float is a Sea-Bird Navis and it is equipped with a SUNA nitrate sensor, SBE 63 oxygen sensor, and WetLabs MCOM biooptical sensor.
9313SoOcn (5904474) Deployed Dec. 7, 2014 South Atlantic and across the Weddell Sea. This is one of 12 floats that will be deployed from the Polarstern. This float is a Teledyne/Webb APEX float and it is equipped with a DuraFET pH sensor, ISUS nitrate sensor, Aanderaa 4330 oxygen optode, and WetLabs FLBB biooptical sensor.
9096SoOcn (nnnnnn) Deployed Dec. 10, 2014 South Atlantic and across the Weddell Sea. This is one of 12 floats that will be deployed from the Polarstern. This float is a Teledyne/Webb APEX float and it is equipped with a DuraFET pH sensor, ISUS nitrate sensor, Aanderaa 4330 oxygen optode, and WetLabs FLBB biooptical sensor.
0509SoOcn (5904482) Deployed Dec. 12, 2014 South Atlantic and across the Weddell Sea. This is one of 12 floats that will be deployed from the Polarstern. This float is a Sea-Bird Navis and it is equipped with a DuraFET pH sensor, SUNA nitrate sensor, SBE 63 oxygen sensor, and WetLabs MCOM biooptical sensor.
7652SoOcn (nnnnnn) Deployed Dec. 10, 2014 South Atlantic and across the Weddell Sea. This is one of 12 floats that will be deployed from the Polarstern. This float is a Teledyne/Webb APEX float and it is equipped with an ISUS nitrate sensor, Aanderaa 4330 oxygen optode, and WetLabs FLBB biooptical sensor.
4900093

Sept. 9, 2002 to August 8, 2005

Hawaii Ocean Time series (HOT) station This was one of the first floats deployed with an oxygen sensor (Seabird 43). Results are described in Riser and Johnson (Riser, S. C. and K. S. Johnson. 2008. Net production of oxygen in the subtropical ocean. Nature, 451, 323-325). The oxygen data have been quality controlled by adjusting to match Winkler titrations made by HOT personnel on the deployment cruise.
5900952

June 2005 to March 2007

Hawaii Ocean Time series (HOT) station This float was deployed with an oxygen sensor (Aanderaa Optode) at HOT. The oxygen data have been quality controlled by adjusting to match Winkler titrations made by HOT personnel on the deployment cruise.
5901069

March 2006 to January 2008

Hawaii Ocean Time series (HOT) station This float was deployed with an oxygen sensor (Aanderaa Optode) at HOT. The oxygen data have been quality controlled by adjusting to match Winkler titrations made by HOT personnel on the deployment cruise.
5901336

February 2007 to August 2009

Hawaii Ocean Time series (HOT) station This float was deployed with an oxygen sensor (Aanderaa Optode) SW of HOT. The oxygen data have been quality controlled by adjusting to match Winkler titrations made by HOT personnel when the float drifted near to HOT.
Last updated: Dec. 15, 2014