Your Objective

Use pH with depth data to determine if there are relationships over time across different regions of the ocean.

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Data Tips

When the site loads, you are able to see pH data data from the Oregon Offshore (located in 580m of water) and the Oregon Slope Base (in 2,906m of water) both off of Oregon. You can interact with the data by:

The color denotes the time of year the pH data are from. January starts as light purple/pink and December ends as dark blue/purple.

Note, not all of the data may be accurate, as the sensor can become biofouled over time or other sampling issues.

Questions for Thought

Orientation Questions
  • Across what time periods are you able to observe pH data in these graphs?
  • What is the first month and year there are data for each graph?
  • What is the last month and year there are data for each graph?
  • What is the overall range of pH data you are able to observe in these graph?
Interpretation Questions
  • What similarities and differences did you find in patterns of pH with depth over time between Coastal Offshore and Shallow Slope locations in temperate North Pacific Ocean locations?
  • What other questions do you have about variations in patterns of pH with depth over time and space from these data?

Background Information

Click on the images below to learn more about where and how the dataset above was collected.

Dataset Information

The data for this activity was obtained from the following profiling pH instruments:

Download this Dataset

The above datasets were downloaded from the OOI data portal with minimal editing. This preserved the raw variability exhibited in individual profiles, though not all of the measurements may be accurate due to the complexity of measuring pH in the ocean.