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Corrections are made both for identified sensor drift and for a thermal lag error, which can result when the float ascends through a region of strong temperature gradients.įollowing this delayed-mode correction, salinity errors are usually reduced further and in most cases the data become good enough to detect subtle ocean change. At a later stage, salinities are corrected by expert examination, comparing older floats with newly deployed instruments and with ship-based data. For many floats this drift is small, and the uncorrected salinities are accurate to ±. The data delivered in real time are sometimes affected by sensor drift. The temperatures in the Argo profiles are accurate to ± 0.002☌ and pressures are accurate to ± 2.4dbar. Additionally, if there is a known offset in salinity, this is applied and appears in the PSAL_ADJUSTED variable.

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“R” files should be free from gross errors in position, temperature and pressure. If your work is not sensitive to small pressure biases, it is probably acceptable to use “R” files. PRES_ADJUSTED_ERROR should be checked and where values are greater than 20db, these data should be rejected.Use the quality flags in the Argo data files and data labeled with QC = 1.calculations of global ocean heat content or mixed layer depth) Argo recommends the following guidelines: In particular, if you are doing scientific work sensitive to small pressure biases (e.g. If your application requires very high accuracy, use the ADJUSTED fields in the D-files and read and inspect their assigned errors and qc flags. They also have statistical uncertainty assigned to each observation based on both the sensor accuracy and the correction accuracy. D files have passed expert QC inspection and have had sensor drifts removed. Most of these errors are the result of sensor drifts. R files contain data that have only passed automated simple QC tests in real time and so may contain temperature, pressure and/or salinity errors. What is the difference between an “R” and a “D” profile file? What if I have questions about Argo or the data?.Is there a way to display data in Google Earth?.Are there any resources for using Argo data in the classroom?.Is there an easy way to view Argo data?.Are there collections of profiles that have been curated?.Are there gridded data or other data products available?.

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How do I download BGC-Argo data? Can I get only the BGC parameters of interest?.

How do I search for data in a specific time and location?.

What cycle timing information should Argo floats send back?.

What is a core-Argo file? What is a B-file? What is an S-file?.

What is new in the V3 & higher meta file?.

What is new in the V3 & higher profile file?.

What is the status of the new V3 data format roll-out?.

Are there archives of the Argo dataset?.

Will I ever need to download this file again?

Are these sensor problems documented in a journal paper?.

Druck pressure sensor micro-leak problem.

APEX truncated negative pressure drifts.

High salinity errors in some SBE CTD cells.

Garmin GPS Units on Navis and APEX floats.

What are “Salty Drifters” and how are they affecting the salinity data?.

History of sensor problems in Argo dataset

Do all floats vertically sample pressure, temperature and salinity in the same manner?.

Most floats now being deployed use two-way communication.

What timing information is available in the trajectory files?.

Can a float have both an “R” and a “D” trajectory file? Which should I use?.

What is the status of the RBR 2K CTD data?.

Is the Argo data set described in a journal paper?.

What is the difference between an “R” and a “D” profile file?.Frequently Asked Questions about Argo Data Characteristics of the Argo dataset

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