Chapter Six

Data analysis concepts and observational methods

Contents:

• Example 6A: Sections with Vertical Axes other than Pressure (or Depth)
  • Exercise 6A-01: Vertical Sections - Contour Plots with Sigma-0 as the Vertical Axis
  • Exercise 6A-02: Making a Property-Property Plot with Nitrate and Phosphate
  • Exercise 6A-03: Vertical Sections - Making a Phosphate Based Interpolation Surface
  • Exercise 6A-04: Vertical Sections - Making a Contour Section With the Mean Subtracted
• Example 6B: Sections with horizontal axis other than distance
  • Exercise 6b-01: Other Plots - Using Time As the X-Axis on a Contour (Vertical Section) Plot
• Example 6C: Exploiting some of JOA’s Mapping Features
  • Exercise 6c-01:
• Example 6D: Maps of Properties on Density and Other Surfaces
  • Exercise 6d-01: Other Maps - Maps on Density Surfaces
• Example 6E: Maps of Properties on Extrema
  • Exercise 6e-01
• Example 6F: Plotting Map of Average of Properties Between Two Surfaces
  • Exercise 6f-01

Data files supplied for Chapter 6 exercises

• HOT_bottle_nutrient_data.joa

• P16_2005_2006_clean_bottle.joa

• WOA05_NorthAtlantic_square.joa

• WOA09_P16.joa

Download: Chapter 6 Data Files

Goals

• Gain familiarity with useful oceanographic analysis and presentation tools

• Learn more about oceanographic features

JOA Note

• JOA’s tool set is described more comprehensively in the JOA User Guide

DPO Chapter 6 Sections

DPO JOA examples are available for the following emphasized sections:

6.1	Oceanographic sampling
6.2	Observational error
6.3	Basic statistical concepts
6.3.1	Mean, variance, standard deviation and standard error
6.3.2	Probability density function
6.3.3	Covariance, auto-covariance, integral time scale, degrees of freedom and confidence intervals
6.3.4	Least squares analysis
6.4	Variation in space: profiles, vertical sections and horizontal maps
6.4.1	Variation in the vertical direction
6.4.1.1	Sampling
6.4.1.2	Vertical profiles
6.4.1.3	Vertical sections
6.4.2	Variation in the horizontal direction
6.5	Variation in time
6.5.1	Time series data display
6.5.2	Velocity (vector) data time-series analysis
6.5.3	Spectral analysis
6.5.4	Filtering data
6.6	Multi-dimensional sampling
6.6.1	Multi-dimensional time series data and empirical orthogonal functions
6.6.2	Climatologies and atlases
6.7	Water property (water mass) analyses
6.7.1	Analysis using two characteristics, e.g. (–S, S–O2
6.7.2	Volumetric (-S characteristics of ocean waters
6.7.3	Optimum multiparameter analysis (OMP)
6.8	Glossary