This file contains University of Miami  ACE-1 atmospheric sulfur dioxide 
data (de Bruyn and Saltzman).  Measurements were made from the R\V 
Discoverer using a Fluorescence based HPLC system.  The file consists of two
columns, time in decimal Julian day (GMT) and SO2 concentrations in pptv.
The data has be filtered for stack gas contamination using wind speed and 
direction and has been averaged into 30 minute bins.  There are ~3 
measurements per bin.  Levels above 200pptv are either of volcanic (Hawaii, 
JDay 294-295) or anthropogenic (eg. JDay 330-330.5) origin. While the data 
is preliminary, we do not expect it to change significantly.