SeaBASS Submission Checklist: Backscatter sensors 

Instructions: Please fill in section I. and the applicable bulleted points in section II. Rename this file to be specific to your data, for example, “checklist_MyInstrument_MyCruiseName.rtf” and include it among your submission’s documents.

Submissions require reporting methods of the acquisition process as well as data processing. Every processing step should be detailed with methods and equations.

I. Submission Info
Experiment name: PVST_SOPACE
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Cruise name: TN444
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Instrument model & manufacturer: Hyper-bb S/N 8005, Sequoia Scientific
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Data type: flow through
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II. Backscatter Documentation Requirements
	•	Describe instrument characteristics (from the manufacturer), including spatial, spectral, electrical and physical characteristics:
				28 wavelength single angle backscattering sensor. 

	•	Report instrument characterization results including:
	•	Nominal wavelength(s) (and FWHM(s) if available): nominal 430,440,450,460,470,480,490,500,510,520,530,540,550,560,570,580,590,600,610,620,630,640,650,660,670,680,690,700.
	•	Angles (Angular Field of view for each of channels, if available): Angle of scattering is 134 +/- 1.5 degrees based on Zhang et al., 2021 and Zhang personal communication 11/14/2024.
	•	Calibration details: 
	•	Date of calibration applied to data. Pre-cruise or Post-cruise: Used Pre-cruise calibration ‘Hbb_Cal_Plaque_20241010_142447.mat” performed on 2024-10-10.
	•	Who performed the calibration? (Manufacturer, your own lab, third party): Emmanuel Boss using manufacturer calibration chamber.
	•	Sampling procedure: inline using the box designed and sold by Sequoia Scientific.
	•	Sampling rate: 0.1Hz
	•	Data processing. Specify the conversion from data counts to particulate backscatter (bbp) : 
	•	Conversion from data counts to β (calibration equation): 
	•	Absorption correction (if performed): Yes, attenuation correction based on Zhang personal communication 11/14/2024 (Zhang et al. in prep.)
	•	T,S correction performed (yes/no): Yes
	•	Calculation of bb from β – which method? 
	•	If single-angle measurement, what value of chi was used? 1. 177.
	•	Subtraction of backscattering due to water – what model was used? Method based on Zhang et al. 2009 applied to total measurements and hourly filtered measurments before substraction of hourly filtered to total measurements.
	•	Dark correction. Describe method for obtaining dark values (e.g. tape over sensor or detector, lens cap, or using calibration values). Please report (if available) median/mean and variability (e.g. standard deviation):
			Dark values were derived using a black tape on the sensor. Was found to be nearly constant from 2021-2024. Not needed for calibration independent technique.
	•	If data were collected or processed through commercial software package (e.g., ECOview, Hydrosoft):
	•	Software and version: No commercial. Used Inlinino to record, and InLineAnalysis to process https://github.com/OceanOptics/InLineAnalysis 
	•	Settings and optional modules used: N/A
	•	If data were binned, describe a method and provide measure of variability (e.g. standard deviation): 5 minute bins between 2.5 and 97.5% percentiles + standard deviation
	•	Any other data manipulation (intercalibration, deep values correction) performed? If so please elaborate. 

III. SeaBASS Data File Information
This section does not need to be filled out. However, please note that the following information should be included within each SeaBASS data file.

Optional but recommended metadata headers:
	•	Wind speed (/wind_speed ; m/s):
	•	Cloud cover (/cloud_percent ; %):
	•	Wave height (/wave_height ; m):

Data fields must include the following (see also https://seabass.gsfc.nasa.gov/wiki/stdfields for additional field names and info)
	•	Depth:
	•	Water temperature (Wt)
	•	Conductivity (cond)
	•	Salinity (sal)