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WOUDC total ozone master file
=============================

Title
-----

WOUDC total ozone master file

Abstract
--------

The WOUDC total ozone master file provides a consolidated product of daily total
ozone values from the WOUDC archive.

Keywords
--------

ozone,total ozone,total column ozone,O3,daily,master file

ISO 19115 Topic Category
------------------------

climatologyMeteorologyAtmosphere

URL
---

https://woudc.org/archive/Summaries/TotalOzone/Daily_Summary

Data Use Policy
---------------

https://woudc.org/about/data-policy.php

Distribution
------------

https://woudc.org/archive/Summaries/TotalOzone/Daily_Summary/o3tot.zip

The data is packaged with zip compression and needs to be unzipped in order
to use the file o3tot.dat.

Dataset Description
-------------------

The o3tot.dat file is ASCII encoded with a fixed field coded format. Each
line represents a daily record. Each daily record is 29 characters long with
the following fixed format:

SSSYYYYMMDDHHGGLSXXXEEEIINNNN

SSS is the same as the WOUDC Platform ID (position 1-3)
YYYY is year (position 4-7)
MM   is month (position 8-9)
DD   is day (position: 10-11)
HH   is the start hour of the observation - rounded to whole number where required (position 12-13 - may be blank)
GG   is the finish hour of observation (if HH value is given) 
     OR either the representative hour of observation OR number of Observations; rounded to whole number where required (position 14-15)
L    is wavelength pair - typically AD pair for Dobson/Microtops coded 0, coded 8 for Filter instruments and coded 9 for Brewer instruments) (position 16)
S    Observation type - typically Direct Sun (DS) coded 0, typically Focused Moon (FM) coded 1, typically Zenith Cloud (ZS) coded 2 or 4, 
     typically Zenith Blue Sky (ZB) or Focused Sun (FZ) or Global Irradiance (GI) coded 9, ) (position 17)
XXX  is the total column ozone amount in Dobson units (position 18-20)
EEE  is reserved for ozone standard error - presently blank ((position 21-23)   
II   is the instrument type (1=Brewer, 3=Dobson, 4=Japanese Dobson, 9=Filter, 99=Microtops/SAOZ/Hoelper/SpecialO3/Vassey/Unknown/Pion) (position 24-25) 
NNNN is the instrument serial number (Note: Japanese Dobson numbers are 4 digit numbers) (position 26-29)

Example
^^^^^^^

SSSYYYYMMDDHHGGLSXXXEEEIINNNN
00719651202  0500283    45706

Station 007, 1965-12-02, Time of observation 05Z on AD pair (0) using DS (0) for 
Japanese Dobson instrument (04) number 5706