From: Paul Eriksen
Sent: November 30, 2005 10:44 AM
Subject: RE: brewer data Sondrestrom 98+99 reposted

Generally the ZS-measurements turns out high 
(negative) SO2-values when the mu-value is higher 
than about 2.0. For DS-SO2 this happens for mu 
larger than about 3. 

Concerning the file for February 1997

There are several days only 1 and 2 good ZS-measurements
but some exhibit slightly higher std.dev.'s for 
O3 than those that cause the measurements to be 
accepted as 'good'. Despite the large SO2-values,
days 19 and 24 February 1997 are considered OK.


Concerning the file for October 1997/98

All large negative SO2 are for ZS because of large mu as per 
opening comment. For October 1998, there may have been a huge 
plume from the power plant passing the Brewer's line of sight.