FloatViz 4.0 Quality Controlled Data- Apex/ISUS Data Visualization

An ISUS nitrate sensor in a Webb Research Apex profiling float

What's new? This page serves quality controlled sensor data, if it is available for a float (marked with #). Generally a float must be in the water for 6 months to 1 year before the QC procedures can be applied. If the file name on plots contains QC, the data has been quality controlled. More is coming on the QC process. Generally, oxygen values were corrected for sensor gain (10% average correction), and nitrate values were corrected for sensor gain (very rarely), sensor offset and sensor drift. Corrections were determined by comparing 1000 m nitrate values to World Ocean Atlas 2009 gridded values at the same location of each profile to assess offset and sensor drift in time. Headers in the data file on the Floatlist.htm page show oxygen gain correction, and for nitrate, the cycle number when correction was started, sensor gain , sensor offset and sensor drift (per year) which were applied.
Quick Instructions Float list and link to complete Ascii data files

Raw Data

Map of float tracks

Apex/ISUS description page
Select Output Type and Send Request:

Data Quality:

What dates?

Change dates: (MM/DD/YYYY)
Start Date:
End Date:  
Select Float (ctrl click for more than one)
Select One X Variable
Select Y Variables (ctrl click for more than one)

Autoscale X & Y axis :

Enter Ranges if Autoscale is Off (Min & max ranges default to 0 and 200 if Autoscale off and box is empty. Depth ranges are entered as negative values on Y axis and as positive values on X axis.)

X Min:     X Max:   
Y Min:     Y Max:   
Y Stack: (In a single graph, multiple Y variables or multiple stations are stacked vertically if it is On)
Enter Min and Max Depth range for data used in Time Series Plot (X Var = Date) Min Depth:    
Max Depth:

* These floats have biooptical sensors for chlorophyll and backscatter in addition to nitrate, oxygen and a CTD.
** These were short-term test deployments and the floats were then recovered.
+ These floats have exhausted their batteries and are not operating.
o Oxygen concentration on these floats have have been quality controlled by adjusting raw data to fit Winkler titrations (more coming on process).
$ These floats were deployed near Hawaii between 2002 and 2008 and have all stopped operating. They have only O2 sensors.
$$ These floats either were not deployed with a nitrate sensor or the nitrate sensor has stopped and they have oxygen sensors only.
% These floats are equipped with Durafet pH sensors modified at MBARI to operate at high pressure. pH reported on the Total Proton Scale at in situ T/P and at 25C/1 atm. # QC's data is being used for these floats

MBARI Chem Sensor Home Page        UW Float Page

Data Adjustments, Updated 2/14/2013

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This work is supported by MBARI, the National Science Foundation and the National Ocean Partnership Program

Last Modified 1/15/2014