"ACE 1, Leg 2, PMEL 7-stage impactor data collected onboard the Discoverer."

This is the text descriptor file for data contained in the file L2IMP7_fin.csv.
Please contact Trish Quinn when using data (quinn@pmel.noaa.gov).

Columns in the spreadsheet are:

"1, sample number"
"2,start time, GMT"
"3, stop time, GMT"
"4, start latitude"
"5, stop latitude"
"6,start longitude"
"7, stop longitude"
"8, average RH of the sampled air stream"
"9, standard deviation of the RH of the sampled air stream"
"10,volume of sample, m3 of air"		
"11,ion concentration in ng/m3 for Dp,1"		
"12, ion concentration in ng/m3 for Dp,2"		
"13, ion concentration in ng/m3 for Dp,3"		
"14, ion concentration in ng/m3 for Dp,4"		
"15, ion concentration in ng/m3 for Dp,5"		
"16, ion concentration in ng/m3 for Dp,6"		
"17, ion concentration in ng/m3 for Dp,7"		

Aerodynamic mean diameter (um) and dlogDp for each stage:		
These diameters are reported at the relative humidity of the sampled air stream.		

stage	"mean D,aero"	dlogDp
1	0.149	0.54
2	0.322	0.131
3	0.49	0.233
4	0.89	0.281
5	1.69	0.278
6	3.3	0.309
7	7.4	0.395
	 	
Codes used in the file:		

"M_Na_BB, Na concentration is below the blank value (< 210 ng / sample volume (m3))."		
"M_NH4_BB, NH4 concentration is below the blank value (< 20 ng / sample volume (m3))."		
"M_K_BB, K concentration is below the blank value (< 43 ng / sample volume (m3))."		
"M_Mg_BB, Mg concentration is below the blank value (< 41 ng / sample volume (m3))."		
"M_Ca_BB, Ca concentration is below the blank value (< 970 ng / sample volume (m3))."		
"M_Cl_BB, Cl concentration is below the blank value (< 450 ng / sample volume (m3))."		
"M_Br_BB, Br concentration is below the detection limit (< 8 ng / sample volume (m3))."		
"M_NO3_BB, NO3 concentration is below the blank value (< 11 ng / sample volume (m3))."		
"M_SO4_BB, SO4 concentration is below the blank value (< 140 ng / sample volume (m3))."		
"T_Na_BB, Na concentration is below the blank value (< 350 ng / sample volume (m3))."
"T_NH4_BB, NH4 concentration is below the blank value (< 19 ng / sample volume (m3))."
"T_K_BB, K concentration is below the blank value (< 105 ng / sample volume (m3))."
"T_Mg_BB, Mg concentration is below the blank value (< 88 ng / sample volume (m3))."
"T_Ca_BB, Ca concentration is below the blank value (< 2700 ng / sample volume (m3))."
"T_Cl_BB, Cl concentration is below the blank value (< 580 ng / sample volume (m3))."
"T_Br_BB, Br concentration is below the detection limit (< 30 ng / sample volume (m3))."
"T_NO3_BB, NO3 concentration is below the blank value (< 88 ng / sample volume (m3))."
"T_SO4_BB, SO4 concentration is below the blank value (< 190 ng / sample volume (m3))."