MDUC DATA REPORT: CTD CORE DATA
	Report prepared by Reiko Michisaki
	Thursday, May 31, 2001 11:10:47 AM
	Cruises taken this month
	Project	Cruise	Date	PI	Description
	PTLO	13501	5/15/01	Tim Pennington	Biogeochemical Cycles: Time series: 
	Stations C1, M1, and M2
	SECRET	S301	5/1/01	Francisco Chavez	Biogeochemical Cycles: Hydrographic 
	transect: Stations Line 67
	Cruises loaded this month*
	Project	Cruise	# Stations	Date	Description
	PTLO	11501	3	4/25/01	Biogeochemical Cycles: Time series: 
	Stations C1, M1, and M2
	PTLO	13501	3	5/15/01	Biogeochemical Cycles: Time series: 
	Stations C1, M1, and M2
	*Data loaded pertains only to the core data, may not contain biological or chemical data.
	Loading details
	Record counts
	Cruise	BCTD	PCTD
	11501	33	1213
	13501	33	1222
	Problems 
	1. No problems were reported in May.
	Modifications
	1. Correct S400 Salinity and Conductivity.  Re: DJ Osborne
	S400 was a cruise on the New Horizon for Curt Collins, using the MBARI CTD, with a 
	scrips Deck unit, scrips techs running and setting up the system.  Unfortunately I was 
	not there to set up and run the system.  There was a documented problem with the 
	secondary sensors not priming their pumps properly, however the sensors I loaded into 
	BOG were the primary sensors - so this is not the problem. 

	The phenomena apears to be localized to the first depth bin.  We had to go back and 

	MBARI Confidential Information	Page 1 of 2

MDUC DATA REPORT: CTD CORE DATA
	Report prepared by Reiko Michisaki
	Thursday, May 31, 2001 11:10:47 AM
	reprocess this data and at first glance it looks like the surface bin might have been 
	screwed up.  That is it was not processed the way the system was ran, however this is 
	not the case because some of the casts first bin processed correctly.  Unless of course 
	the techs were messing around with something trying to track down that sensor 
	calibration issue that ended up being something else other than our sensors being out of 
	calibration.  I went through significant effort trying to track down an error of .001 C for 
	this cruise and the provious cruise and it ended up being something  else, what they never
	 found out or never told me.

	So it is not the surface bin processing.  It is probably because they did not hold the CTD 
	at the surface properly.  They probably just started the data acquisition the same time they
	 THOUGHT the ctd was in the water - that is they did not do a three minute soak to 
	polarize the DO sensor.  This time also allows the data aquisition system to be restarted 
	with the CTD right at the surface, if you don't do this you will most always mess up the 
	surface bin.  The scrips CTD techs probably didn't do this.  
	
	S400 has bad first bin data for the conductivity sensors and it should be removed. The 
	DO sensor data is not as accurate as it could be.  Many CTD's don't have DO sensors 
	and the techs would not know to do this soak.   AT this time this is the only cause for 
	this I can imagine.  Having our gear used in bits and pieces like this and without an 
	MBARI trained tech to run the system should be avoided as much as possible.
	MBARI Confidential Information	Page 2 of 2