AC-9 Data Format

The data processing was performed using a combination of WET Labs, SeaBird, and custom software.

Each ASCII data file contains a continuous set of measurements from either the downcast (*DOWN.txt) or upcast (*UP.txt). The files contain a one-line header with the column names. The data are formatted in 30 columns, in the following order:

Column	Label	Units	Description
1	dh4Time	s	time elapsed since start of day (HST)
2	ac9Time	ms	time elapsed since ac-9 started logging
3	ac9Abs412	m^-1	ac-9 absorption at 412 nm
4	ac9Abs440	m^-1	ac-9 absorption at 440 nm
5	ac9Abs488	m^-1	ac-9 absorption at 488 nm
6	ac9Abs510	m^-1	ac-9 absorption at 510 nm
7	ac9Abs532	m^-1	ac-9 absorption at 532 nm
8	ac9Abs555	m^-1	ac-9 absorption at 555 nm
9	ac9Abs650	m^-1	ac-9 absorption at 650 nm
10	ac9Abs676	m^-1	ac-9 absorption at 676 nm
11	ac9Abs715	m^-1	ac-9 absorption at 715 nm
12	ac9Att412	m^-1	ac-9 attenuation at 412 nm
13	ac9Att440	m^-1	ac-9 attenuation at 440 nm
14	ac9Att488	m^-1	ac-9 attenuation at 488 nm
15	ac9Att510	m^-1	ac-9 attenuation at 510 nm
16	ac9Att532	m^-1	ac-9 attenuation at 532 nm
17	ac9Att555	m^-1	ac-9 attenuation at 555 nm
18	ac9Att650	m^-1	ac-9 attenuation at 650 nm
19	ac9Att676	m^-1	ac-9 attenuation at 676 nm
20	ac9Att715	m^-1	ac-9 attenuation at 715 nm
21	ctdTime	s	time elapsed since CTD started logging
22	ctdSalinity	psu	salinity
23	ctdTemperature	ITS-90, ^oC	temperature
24	ctdConductivity	μS cm^-1	conductivity
25	ctdDepth	m	depth
26	binnumber		bin number
27	binstart	m	bin start depth
28	bincount		number of data points in bin
29	ac9Chl	mg m^-3	chlorophyll concentration
30	sigmaT	kg m^-3 - 1000	density of seawater at atmos. pressure

Webpage by Jasmine S. Nahorniak, Oregon State University.