Chapter Four
============

Typical distributions of water characteristics
----------------------------------------------

.. toctree::
  :maxdepth: 2
  :caption: Contents:

  4a
  4b
  4c
  4d


.. admonition:: Data files supplied for Chapter 4 exercises

  * WOA05_surface.jos
  * WOA05_A16.joa
  * WOA05_I8S_I9N.joa
  * WOA09_P16.joa
  * A16_2003_2005_clean_cfc.joa

  Download: :download:`Chapter 4 Data Files <./DPO_data_chapter_4.7z>`

  .. note::
    WOA05_surface.jos is a text data file (i.e., not JOA binary data files). This will be explained at the point where this file is used in the DPO JOA Examples.
  

Goals
`````
* Make a surface map colored by data points (WOA09)
* Make a surface map with color contours (WOA09)
* Make vertical sections
* Learn how to have two or more data sets open at same time
* Make vertical section of theta from WOA09, following A16

To accomplish this, one will
````````````````````````````
* Open and manage multiple data sets


DPO Chapter 4 Sections
``````````````````````

DPO JOA examples are available for the following **emphasized** sections:

.. list-table::
  :widths: 10, 90

  * - **4.1**
    - **Introduction**
  * - **4.2**
    - **Temperature distribution of the oceans**
  * - **4.2.1**
    - **Surface temperature**
  * - **4.2.2**
    - **Upper layer temperature and mixed layer**
  * - **4.2.3**
    - **Thermocline, halocline and pycnocline**
  * - **4.2.4**
    - **Temporal variations of temperature in the upper layer and thermocline**
  * - **4.2.5**
    - **Deep water temperature and potential temperature**
  * - **4.2.6**
    - **Vertical sections of potential temperature**
  * - **4.3**
    - **Salinity distribution**
  * - **4.3.1**
    - **Surface salinity**
  * - 4.3.2
    - Upper layer salinity
  * - 4.3.3
    - Intermediate depth salinity
  * - 4.3.4
    - Deep water salinity
  * - 4.3.5
    - Temporal variations of salinity
  * - 4.3.6
    - Volumetric distribution of potential temperature and salinity
  * - 4.4
    - Density distribution
  * - 4.4.1
    - Density at the sea surface and in the upper layer
  * - 4.4.2
    - Pycnocline
  * - 4.4.3
    - Depth distribution of potential density
  * - **4.5**
    - **Dissolved oxygen**
  * - 4.6
    - Nutrients and other tracers
  * - **4.7**
    - **Age of ocean water**
  * - 4.8
    - Optical properties of seawater