Using JOA with Gridded Data From netCDF Files

Sections in this document:

Introduction to using gridded data with JOA
Download example gridded data files
Using the Live Access Server to construct custom gridded data files

Introduction

This section is under construction. See the Appendix "Advanced Features of JOA" in the JOA User Guide (Second Edition) for instructions on how to use this capability.

Download Data

Available Data Files:

File Name	Region	Variables	Source	Size
NP.nc.zip	North Pacific 108.5E -> 102.5W (150 pts) 0.5N -> 84.5N (85 pts) 0 -> 5500m (33 levels) Annual Mean	T, S, O2, NO3, PO4, SIO3	LAS/World Ocean Atlas 2001	4.4 MB
SP.nc.zip	South Pacific 150.5E -> 70.5W (140 pts) 0.5S -> 74.5N (75 pts) 0 -> 5500m (33 levels) Annual Mean	T, S, O2, NO3, PO4, SIO3	LAS/World Ocean Atlas 2001	5.9 MB
NA.nc.zip	North Atlantic 77.5W -> 21.5E (100 pts) (0.5N -> 88.5N (89 pts) 0 -> 5500m (33 levels) Annual Mean	T, S, O2, NO3, PO4, SIO3	LAS/World Ocean Atlas 2001	2.7 MB
Southern_Ocean_Climatology.nc.zip	Southern Ocean 0E -> 1W (360 pts) 30S -> 80S (51 pts) 0 -> 5000m (38 levels) Annual Mean	T, S, O2	LAS/Southern Ocean Climatology	3.9 MB
t0n155w_lf.nc.zip	155W EQ 1 -> 500m (11 levels) 07/22/1991 -> 01/26/2000 (623 points)	T	TAO	40KB

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Extracting Data from the Live Access to the National Virtual Ocean Data System (NVODS)

Step #1: Click Here to visit the NVODS web site

This page will allow you to select from the datasets organized into different categories:

Step #2: Click on the link: by Discipline (Atmosphere, Ocean, Surface Marine, Land Surface, Topography, Bathymetry)

You will see a list of the datasets organized by discipline:

Step #3: Click on the link: Ocean to see oceanography relatated datasets:

Step #4: Click on one of listed gridded datasets: The datasets compatible with JOA are described in the following table (Note: not all of these datasets have been tested with JOA):

Dataset	Region	Variables	Served By	Description
Levitus (1982) global annual climatology	Global 180W -> 180E (360 pts) 90S -> 90N (180 pts) 0 -> 5500m (33 levels) Annual Mean	T, S, O2	NOAA/PMEL	Link
Levitus (1982) global monthly climatology	Global 180W -> 180E (360 pts) 90S -> 90N (180 pts) 0 -> 1000m (19 levels) Monthly Mean (12 pts)	T	NOAA/PMEL	Link
Levitus (1982) global seasonal climatology	Global 180W -> 180E (360 pts) 90S -> 90N (180 pts) 0 -> 1500m (24 levels) Seasonal Mean (4 pts)	T,S	NOAA/PMEL	Link
NODC World Ocean Atlas 1998	Global 0.5E -> 359.5E (360 pts) 89.5S -> 89.5N (180 pts) 0 -> 5500m (33 levels) 0 -> 1500m (24 levels Monthly only) Annual and Monthly Mean Global 2.5E -> 357.5E (xxx pts) 87.5S -> 87.5N (xx pts) 0 -> 5500m (33 levels) 0 -> 1500m (24 levels Monthly only) Annual and Monthly Mean	T,S	NOAA- CIRES Climate Diagnostics Center	Link
Olbers southern ocean annual climatology	Southern Ocean 0E -> 1W (360 pts) 30S -> 80S (51 pts) 0 -> 5000m (38 levels) Annual Mean	T, S, O2	NOAA/PMEL	Link
SODA-POP v1.4.2 monthly means	Global 0.25E -> 359.75E (720 pts) 75.25S -> 89.25N (330 pts) 5 -> 5374m (40 pts) 15JAN1958 ->15DEC2001 (528 pts)	T, S	IPRC-SOEST	Link
World Ocean Atlas 1994 (Annual Means)	Global 120.5E -> 379.5E (360 pts) 89.5S -> 89.5N (180 pts) 0 -> 5500m (33 levels) Annual Mean	T, S, O2, NO3, PO4, SIO3	NOAA/PMEL	Link
World Ocean Atlas 1994 (Monthly Means)	Global 120.5E -> 379.5E (360 pts) 89.5S -> 89.5N (180 pts) 0 -> 1000m (? levels) Monthly Mean	T, S, O2, NO3, PO4, SIO3	NOAA/PMEL	Link
World Ocean Atlas 1994 (Seasonal Means)	Global 120.5E -> 379.5E (360 pts) 89.5S -> 89.5N (180 pts) 0 -> 5500m (33 levels) Seasonal Mean	T, S, O2	NOAA/PMEL	Link
World Ocean Atlas 1998 Annual	Global 0.5E -> 359.5E (360 pts) 89.5S -> 89.5N (180 pts) 0 -> 5500m (33 levels) Annual Mean	T, S, O2, NO3, PO4, SIO3, CH(0:100)	IRI/LDEO	Link
World Ocean Atlas 1998 Monthly	Global 0.5E -> 359.5E (360 pts) 89.5S -> 89.5N (180 pts) 0 -> 1500m (? levels) Monthly Mean	T, S, O2	IRI/LDEO	Link
World Ocean Atlas 1998 Seasonal	Global 0.5E -> 359.5E (360 pts) 89.5S -> 89.5N (180 pts) 0 -> 1500m (? levels) Seasonal Mean	T, S, O2, NO3(0:500), PO4(0:500), SIO3(0:500)	IRI/LDEO	Link
World Ocean Atlas 2001 Annual	Global 0.5E -> 359.5E (360 pts) 89.5S -> 89.5N (180 pts) 0 -> 5500m (33 levels) Annual Mean	T, S, O2, NO3, PO4, SIO3, CH(0:100)	NOAA/PMEL	Link
World Ocean Atlas 1998 Monthly	Global 0.5E -> 359.5E (360 pts) 89.5S -> 89.5N (180 pts) 0 -> 1500m (? levels) Monthly Mean	T, S, O2, NO3, PO4, SIO3	NOAA/PMEL	Link
World Ocean Atlas 1998 Seasonal	Global 0.5E -> 359.5E (360 pts) 89.5S -> 89.5N (180 pts) 0 -> 1500m (? levels) Seasonal Mean	T, S, O2, NO3(0:500), PO4(0:500), SIO3(0:500)	NOAA/PMEL	Link

Note: Variables shown are only the actual measured variables. These datasets often contain computed variables such as apparent oxygen utilization that can be easily recomputed in JOA. However, you are not restricted from selecting any variables you choose, but the resulting data product will be comensurately larger. If you are defining a large geographical area or many time steps (e.g., a monthly climatology), we recommend selecting only the variables you will actually use.

Step #5: Select to variables that you want to include in the data file generated by the server and then click the "Next >" link:

Step #6: Select the geographic domain of the data product by dragging a selection rectangle on the map (use the handles to refine your selection):

Step #6 continued: The "view" should be set to "xyz volume" and the "output" as "NetCDF". Click the "Next >" link to generate the datafile. Note: You can also select a subset of the depth range below the map panel. Note also that if you select variables that have different depth axes (e.g., chlorophyll and dissolved oxygen), the depth ranges changes to smallest range of the selected variables.

Step #7: A blank, untitled window pops up while the data file is downloaded. The downloded file will be named "LASoutput.nc." You should change the name to something more indicative of it's content. In this example, I named the file "Ind_2001_annual.nc." Note: these files can be large (e.g., this example is 8.8MB), so download times may be significant depending upon your level of internet service.

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