    Explanation of Columns in Data Set
    
    Time             Running PSS Time (sec)
    PSS Depth        Depth of PSS (m)
    Water Temp       Water Temperature (deg C)
    Light Atten      Relative Light Attenuance, (air ~ 110, SEE Note 1) 
    TSM              Derived TSM (mg/l), SEE Note 2
    PAR              Photosynthetically active radiation (E15 quantum/cm sq./sec.)
    Chl Conc         Derived chlorophyll-a concentration (ug/l), SEE Note 3
    Total Counts     Total Zooplankton Counts (No./L)
    Bin1 Counts      Zooplankton Counts in 1st bin size (No./L)
    Bin2 Counts      Zooplankton Counts in 2nd bin size (No./L)
    Bin3 Counts      Zooplankton Counts in 3rd bin size (No./L)
    Biomass          Zooplankton Biomass (mg wet wt/L)
    Water Depth      Approx water depth at location of PSS (m), based on  
                     NOAA 9 arc-sec bathymetric data set
    Dist from Shore  Approx dist from shore (km), based on lambert conformal 
                     conic projection
    
    Note 1.  During the plume event of 1998, we discovered that the OPC could not 
    detect zooplankton at TSM concentrations > 20 mgL-1 (Ruberg et al. 2001). To 
    overcome this difficulty, we increased light intensity of the OPC diodes by a factor 
    of 9.3 in 1999 and 2000.  This decreased the range of LA values registered by the OPC 
    by a factor of 9.3.  To make all data comparable, we divided the 1998 LA values by 9.3.  
    
    Note 2.  TSM is derived from PSS-LA output. Regression developed by J. Liebig (GLERL)
    using observed TSM values and corresponding PSS-LA.  For a detailed explanation of 
    the TSM regression equations, see [detailed methods](psstsm.doc).
    
    Note 3. Chl-a is derived from fluorometer output (volts). Regressions developed by
    J. Liebig (GLERL) using extracted chls and corresponding pss fluor. volts. For a detailed 
    explanation of the CHL regression equations, see [detailed methods](psschl.doc).
    
    PSS underwater assembly includes the Focal Technologies Mini-Optical Plankton 
    Counter (OPC), the Ocean Sciences OS-200 CTD with X-Y tilt sensor, and a 
    Chelsea Aquatracka III fluorometer (logarithmic amplifiers, chlorophyll 
    range: 0.1-100 ug/L) mounted on an Endeco/YSI Type 493 V-fin.  The system 
    also includes a differential GPS and depth sounder.  The PSS is towed in a 
    vertically undulating (tow-yowed) mode as the ship travels at about 2.5 m/s.





--------------------------------------------------------------------------------------------------
Survey-1998-028 Cruise
Lake Guardian

Data = PSS Data (Ascii)
Plot1 = Location of transect, Depth, flow rate
Plot2 = Depth, Chl-a, Zoop Counts & Biomass, Water Temp, Light Atten
Plot3 = Contour plots of Chl-a, Water Temp, Light Atten
Plot4 = Contour plots of Zooplankton Counts & Biomass

Transect	Object Name	Station		OP Number
Racine		PSS Tow		R10 -> R80	G1998029.06S
Gary		PSS Tow		G21 -> G80	G1998031.18S
St. Joe		PSS Tow		J13 -> J114	G1998032.09S
Saugatuck	PSS Tow		S10 -> S80	G1998033.06S
St. Joe	PSS 	Tow		J14 -> J110	G1998034.09S

--------------------------------------------------------------------------------------------------

Survey-1998-068 Cruise
Laurentian

Data = PSS Data (Ascii)
Plot1 = Location of transect, Depth, flow rate
Plot2 = Depth, Chl-a, Zoop Counts & Biomass, Water Temp, Light Atten
Plot3 = Contour plots of Chl-a, Water Temp, Light Atten
Plot4 = Contour plots of Zooplankton Counts & Biomass

Transect	Object Name	Station		OP Number
St. Joe		PSS Tow		J10 -> J72	L1998075.08S
Gary		PSS Tow		G10 -> G30	L1998076.04S
Muskegon	PSS Tow		M10 -> M110	L1998076.04S	

--------------------------------------------------------------------------------------------------

Survey-1998-230 Cruise
Shenehon

Data = PSS Data (Ascii)
Plot1 = Location of transect, Depth, flow rate
Plot2 = Depth, Chl-a, Zoop Counts & Biomass, Water Temp, Light Atten
Plot3 = Contour plots of Chl-a, Water Temp, Light Atten
Plot4 = Contour plots of Zooplankton Counts & Biomass

Transect	Object Name	Station		OP Number
Muskegon	PSS Tow		M15 -> M110	S1998230.01S

--------------------------------------------------------------------------------------------------

Survey-1998-266 Cruise
Laurentian

Data = PSS Data (Ascii)
Plot1 = Location of transect, Depth, flow rate
Plot2 = Depth, Chl-a, Zoop Counts & Biomass, Water Temp, Light Atten
Plot3 = Contour plots of Chl-a, Water Temp, Light Atten
Plot4 = Contour plots of Zooplankton Counts & Biomass

Transect	Object Name	Station		OP Number
St. Joe		PSS Tow		J80 -> J10	L1998266.05S
St. Joe		PSS-CTD		J80		L1998266.01
St. Joe		PSS-CTD		J10		L1998266.11

--------------------------------------------------------------------------------------------------

Survey-1998-301 Cruise
Laurentian

Data = PSS Data (Ascii)
Plot1 = Location of transect, Depth, flow rate
Plot2 = Depth, Chl-a, Zoop Counts & Biomass, Water Temp, Light Atten
Plot3 = Contour plots of Chl-a, Water Temp, Light Atten
Plot4 = Contour plots of Zooplankton Counts & Biomass

Transect	Object Name	Station		OP Number
St. Joe		PSS Tow		J10 -> J80	L1998301.02S
Muskegon	PSS Tow		M10 -> M110	L1998302.02S
Muskegon	PSS-CTD		M15		L1998302.15
Muskegon	PSS-CTD		M45		L1998302.13
Muskegon	PSS-CTD		M110		L1998302.06

--------------------------------------------------------------------------------------------------

Survey-1998-325 Cruise
Laurentian

Data = PSS Data (Ascii)
Plot1 = Location of transect, Depth, flow rate
Plot2 = Depth, Chl-a, Zoop Counts & Biomass, Water Temp, Light Atten
Plot3 = Contour plots of Chl-a, Water Temp, Light Atten
Plot4 = Contour plots of Zooplankton Counts & Biomass

Transect	Object Name	Station		OP Number
St. Joe		PSS Tow		J10 -> J65	L1998325.05S
St. Joe		PSS-CTD		J15		L1998325.01
St. Joe		PSS-CTD		J45		L1998325.06


--------------------------------------------------------------------------------------------------
### Survey-1999-046 Cruise  
Lake Guardian

Data = PSS Data (Ascii)  
Plot1 = Location of transect, Depth, flow rate  
Plot2 = Depth, Chl-a, Zoop Counts & Biomass, Water Temp, Light Atten  
Plot3 = Contour plots of Chl-a, Water Temp, Light Atten  
Plot4 = Contour plots of Zooplankton Counts & Biomass

Transect	Object Name	Station		OP Number
Racine		PSS Tow		R15 -> R80	G1999046.10S
Racine		PSS-CTD		R15		G1999046.05
Chicago		PSS Tow		C15 -> C80	G1999047.21S
Chicago		PSS-CTD		C15		G1999047.20
Gary		PSS Tow		G15 -> G45	G1999048.06S
Gary		PSS-CTD		G15		G1999048.05
St. Joe		PSS Tow		J15 -> J80	G1999049.09S
St. Joe		PSS-CTD		J15		G1999049.08
Muskegon	PSS Tow		M15 -> M85	G1999049.33S
Muskegon	PSS-CTD		M15		G1999049.30



### Survey-1999-067 Cruise
Lake Guardian

Data = PSS Data (Ascii)
Plot1 = Location of transect, Depth, flow rate
Plot2 = Depth, Chl-a, Zoop Counts & Biomass, Water Temp, Light Atten
Plot3 = Contour plots of Chl-a, Water Temp, Light Atten
Plot4 = Contour plots of Zooplankton Counts & Biomass

Transect	Object Name	Station		OP Number
Racine		PSS Tow		R15 -> R80	G1999069.10S
Racine		PSS-CTD		R15		G1999069.09
Chicago		PSS Tow		C15 -> C80	G1999070.16S
Chicago		PSS-CTD		C15		G1999070.15
St. Joe		PSS Tow		J15 -> J80	G1999071.04S
St. Joe		PSS-CTD		J15		G1999071.03
Gary		PSS Tow		G15 -> G45	G1999072.12S
Gary		PSS CTD 165	G15		G1999072.11
St. Joe		PSS Tow 166	J80 -> J15	G1999072.29S
Muskegon	PSS Tow		M110 -> M15	G1999073.14S


### Survey-1999-095 Cruise
Lake Guardian

Data = PSS Data (Ascii)
Plot1 = Location of transect, Depth, flow rate
Plot2 = Depth, Chl-a, Zoop Counts & Biomass, Water Temp, Light Atten
Plot3 = Contour plots of Chl-a, Water Temp, Light Atten
Plot4 = Contour plots of Zooplankton Counts & Biomass

Transect	Object Name	Station		OP Number
Chicago		PSS Tow		C15 -> C80	G1999097.08S
Chicago		PSS CTD		C15		G1999097.06
St. Joe		PSS Tow		J15 -> J80	G1999098.09S
St. Joe		PSS-CTD		J15		G1999098.08
Muskegon	PSS-CTD		M15		G1999096.04
DWS		PSS Tow		DWS2 -> DWS	G1999095.26S


### Survey-1999-116 Cruise
Shenehon

Data = PSS Data (Ascii)
Plot1 = Location of transect, Depth, flow rate
Plot2 = Depth, Chl-a, Zoop Counts & Biomass, Water Temp, Light Atten
Plot3 = Contour plots of Chl-a, Water Temp, Light Atten
Plot4 = Contour plots of Zooplankton Counts & Biomass

Transect	Object Name	Station		OP Number
Muskegon	PSS Tow		M15 -> M110	S1999116.06S
Muskegon	PSS CTD		M15		S1999116.05
St. Joe		PSS Tow		J70 -> J15	S1999117.06S	


### Survey-1999-154 Cruise
Lake Guardian

Data = PSS Data (Ascii)
Plot1 = Location of transect, Depth, flow rate
Plot2 = Depth, Chl-a, Zoop Counts & Biomass, Water Temp, Light Atten
Plot3 = Contour plots of Chl-a, Water Temp, Light Atten
Plot4 = Contour plots of Zooplankton Counts & Biomass

Transect		Object Name	Station		OP Number
Muskegon		PSS Tow (Night)	M10 -> M110	G1999155.05S
Muskegon		PSS Tow (Day)	M10 -> M110	G1999155.14S
Deep Water Station	PSS Tow		DWS -> DWS2	G1999156.05S
St. Joseph		PSS Tow		J10 -> J80	G1999156.15S
Gary			PSS Tow		G45 -> G15	G1999157.05S
Chicago			PSS Tow		C80 -> C10	G1999157.17S
Racine			PSS Tow		R80 -> R10	G1999158.08S


### Survey-1999-210 Cruise
Laurentian

Data = PSS Data (Ascii)
Plot1 = Location of transect, Depth, flow rate
Plot2 = Depth, Chl-a, Zoop Counts & Biomass, Water Temp, Light Atten
Plot3 = Contour plots of Chl-a, Water Temp, Light Atten
Plot4 = Contour plots of Zooplankton Counts & Biomass

Transect	Object Name	Station		OP Number
St. Joseph	PSS CTD		J15		L1999210.01
St. Joseph	PSS Tow		J10 -> J80	L1999210.06S
Muskegon	PSS CTD (Night)	M110		L1999211.01
Muskegon	PSS Tow (Night)	M110 -> M10	L1999211.04S
Muskegon	PSS Tow (Day)	M10 -> M110	L1999211.13S


### Survey-1999-229 Cruise
Shenehon

Data = PSS Data (Ascii)
Plot1 = Location of transect, Depth, flow rate
Plot2 = Depth, Chl-a, Zoop Counts & Biomass, Water Temp, Light Atten
Plot3 = Contour plots of Chl-a, Water Temp, Light Atten
Plot4 = Contour plots of Zooplankton Counts & Biomass

Transect	Object Name	Station		OP Number
Muskegon	PSS Tow (Night)	M15 -> M100	S1999229.05S



### Survey-1999-254 Cruise
Laurentian

Data = PSS Data (Ascii)
Plot1 = Location of transect, Depth, flow rate
Plot2 = Depth, Chl-a, Zoop Counts & Biomass, Water Temp, Light Atten
Plot3 = Contour plots of Chl-a, Water Temp, Light Atten
Plot4 = Contour plots of Zooplankton Counts & Biomass

Transect	Object Name	Station		OP Number
St. Joseph	PSS CTD		J45		L1999254.10
St. Joseph	PSS Tow		J10 -> J80	L1999254.06S
Muskegon	PSS CTD		M15		L1999255.01
Muskegon	PSS Tow (Night)	M10 -> M110	L1999255.04S
Muskegon	PSS Tow		M110 -> M10	L1999255.08S



### Survey-1999-292 Cruise
Laurentian

Data = PSS Data (Ascii)
Plot1 = Location of transect, Depth, flow rate
Plot2 = Depth, Chl-a, Zoop Counts & Biomass, Water Temp, Light Atten
Plot3 = Contour plots of Chl-a, Water Temp, Light Atten
Plot4 = Contour plots of Zooplankton Counts & Biomass

Transect	Object Name	Station		OP Number
St. Joseph	PSS Tow		J45 -> J10	L1999292.06S



### Survey-1999-347 Cruise
Shenehon

Data = PSS Data (Ascii)
Plot1 = Location of transect, Depth, flow rate
Plot2 = Depth, Chl-a, Zoop Counts & Biomass, Water Temp, Light Atten
Plot3 = Contour plots of Chl-a, Water Temp, Light Atten
Plot4 = Contour plots of Zooplankton Counts & Biomass

Transect	Object Name	Station		OP Number
Muskegon	PSS CTD		M15		S1999347.01
Muskegon	PSS Tow		M15 -> M110	S1999347.05S
St. Joseph	PSS CTD		J15		S1999348.05
St. Joseph	PSS Tow		J15 -> J45	S1999348.06S

--------------------------------------------------------------------------------

### Survey-2000-049 Cruise
R/V Lake Guardian

Data = PSS Data (Ascii)
Plot1 = Location of transect, Depth, flow rate
Plot2 = Depth, Chl-a, Zoop Counts & Biomass, Water Temp, Light Atten
Plot3 = Contour plots of Chl-a, Water Temp, Light Atten
Plot4 = Contour plots of Zooplankton Counts & Biomass

Transect		Object Name	Station		OP Number
St. Joseph		PSS Tow		J80 -> J15	G2000052.02S
New Buffalo		PSS Tow		NB15 -> NB45	G2000052.25S
Chicago			PSS Tow		C15 -> C80	G2000053.18S
Deep Water Station	PSS Tow		DWS2 -> DWS	G2000054.05S
Muskegon		PSS Tow		M110 -> M15	G2000054.10S



### Survey-2000-070 Cruise
Lake Guardian

Data = PSS Data (Ascii)
Plot1 = Location of transect, Depth, flow rate
Plot2 = Depth, Chl-a, Zoop Counts & Biomass, Water Temp, Light Atten
Plot3 = Contour plots of Chl-a, Water Temp, Light Atten
Plot4 = Contour plots of Zooplankton Counts & Biomass

Transect		Object Name	Station		OP Number
St. Joseph		PSS Tow		J15 -> J80	G2000071.17S
New Buffalo		PSS Tow		NB45 -> NB15	G2000072.06S
Gary			PSS Tow		G45 -> G15	G2000073.01S
Chicago			PSS Tow		C15 -> C80	G2000074.11S
Deep Water Station	PSS Tow		DWS2 -> DWS	G2000075.05S
Muskegon		PSS Tow		M110 -> M15	G2000075.09S



### Survey-2000-101 Cruise
R/V Shenehon

Data = PSS Data (Ascii)
Plot1 = Location of transect, Depth, flow rate
Plot2 = Depth, Chl-a, Zoop Counts & Biomass, Water Temp, Light Atten
Plot3 = Contour plots of Chl-a, Water Temp, Light Atten
Plot4 = Contour plots of Zooplankton Counts & Biomass

Transect		Object Name	Station			OP Number
Offshore Plume Transect	PSS Tow		East Edge->OF4		S2000102.01S
Offshore Plume Transect	PSS Tow		OF4->Wast Edge		S2000102.07S
Offshore Plume Transect	PSS Tow		North Edge->South Edge	S2000102.09S
St. Joseph Transect	PSS Tow		J80->J15		S2000102.18S
New Buffalo Transect	PSS Tow		NB15->NB45		S2000103.05S	



### Survey-2000-135 Cruise
R/V Lake Guardian

Data = PSS Data (Ascii)
Plot1 = Location of transect, Depth, flow rate
Plot2 = Depth, Chl-a, Zoop Counts & Biomass, Water Temp, Light Atten
Plot3 = Contour plots of Chl-a, Water Temp, Light Atten, PAR
Plot4 = Contour plots of PAR, Zooplankton Counts & Biomass

Transect		Object Name	Station		OP Number
Muskegon Transect	PSS Tow		M110->M15	G2000136.04S
Deep Water Transect	PSS Tow		DWS -> DWS2	G2000137.02S
St. Joseph Transect	PSS Tow		J15 -> J80	G2000137.12S
New Buffalo Transect	PSS Tow		NB15 -> NB45	G2000138.08S
Gary Transect		PSS Tow		G45 -> G15	G2000138.19S
Chicago Transect	PSS Tow		C15 -> C45	G2000141.07S



### Survey-2000-158 Cruise
R/V Laurentian

Data = PSS Data (Ascii)
Plot1 = Location of transect, Depth, flow rate
Plot2 = Depth, Chl-a, Zoop Counts & Biomass, Water Temp, Light Atten
Plot3 = Contour plots of Chl-a, Water Temp, Light Atten, PAR
Plot4 = Contour plots of PAR, Zooplankton Counts & Biomass

Transect		Object Name	Station		OP Number
Muskegon Transect	PSS Tow		M110->M15	L2000159.04S
St. Joseph Transect	PSS Tow		J15->J80	L2000159.15S



### Survey-2000-191 Cruise
R/V Laurentian

Data = PSS Data (Ascii)
Plot1 = Location of transect, Depth, flow rate
Plot2 = Depth, Chl-a, Zoop Counts & Biomass, Water Temp, Light Atten
Plot3 = Contour plots of Chl-a, Water Temp, Light Atten, PAR
Plot4 = Contour plots of PAR, Zooplankton Counts & Biomass

Transect		Object Name	Station		OP Number
Muskegon Transect	PSS Tow		M15->M110	L2000191.04S
Deep Water Transect	PSS Tow		DWS->DWS2	L2000192.03S
Chicago Transect	PSS-CTD C80	C80		L2000192.05
Chicago Transect	PSS-CTD C45	C45		L2000192.08
St. Joseph Transect	PSS Tow		J80->J15	L2000192.17S



### Survey-2000-252 Cruise
R/V Laurentian

Data = PSS Data (Ascii)
Plot1 = Location of transect, Depth, flow rate
Plot2 = Depth, Chl-a, Zoop Counts & Biomass, Water Temp, Light Atten
Plot3 = Contour plots of Chl-a, Water Temp, Light Atten, PAR
Plot4 = Contour plots of PAR, Zooplankton Counts & Biomass

Transect		Object Name	Station		OP Number
St. Joseph Transect	PSS Tow		J80->J15	L2000252.07S
Muskegon Transect	PSS Tow		M110->M15	L2000253.04S



### Survey-2000-279 Cruise
R/V Laurentian

Data = PSS Data (Ascii)
Plot1 = Location of transect, Depth, flow rate
Plot2 = Depth, Chl-a, Zoop Counts & Biomass, Water Temp, Light Atten
Plot3 = Contour plots of Chl-a, Water Temp, Light Atten, PAR
Plot4 = Contour plots of PAR, Zooplankton Counts & Biomass

Transect		Object Name	Station		OP Number
Muskegon Transect	PSS Tow		M110->M15	L2000279.04S



### Survey-2000-310 Cruise
R/V Laurentian

Data = PSS Data (Ascii)
Plot1 = Location of transect, Depth, flow rate
Plot2 = Depth, Chl-a, Zoop Counts & Biomass, Water Temp, Light Atten
Plot3 = Contour plots of Chl-a, Water Temp, Light Atten, PAR
Plot4 = Contour plots of PAR, Zooplankton Counts & Biomass

Transect		Object Name	Station		OP Number
St. Joseph Transect	PSS Tow		J80->J15	L2000310.04S
St. Joseph Transect	PSS-CTD J80	J80		L2000310.03
St. Joseph Transect	PSS-CTD J45	J45		L2000310.07
St. Joseph Transect	PSS-CTD J15	J15		L2000310.09
Muskegon Transect	PSS Tow		M45->M15	L2000311.04S
Muskegon Transect	PSS-CTD M45	M45		L2000311.03
Muskegon Transect	PSS-CTD M15	M15		L2000311.05

