BEACH Sediment Trap Flux Data Format Document
                              May 10, 2023

                      University of Hawaii at Manoa
                           1950 East-West Road
                         Honolulu, Hawaii  96822


    BEACH sediment trap flux data are distributed as an ASCII flat
file.  An entire year's data is contained in one file (e.g., 
hot1-12.flux contains the data from HOT-1 through HOT-12).  The files
are self-explanatory and are presented in a format similar to the one
in the Hawaii Ocean Time-series Program Data Report 1.

    A two-line heading labels each column.  Missing data are filled 
with -9.  

Data Record Format:

	 Column Format	Item
	  3-  5   i3	Cruise Number
	  9- 16   i8	Start Date (YYYYMMDD) in HST
	 20- 23   i4	Start Time (HHMM) in HST
	 26- 33   i8	End Date (YYYYMMDD) in HST
	 37- 40   i4	End Time (HHMM) in HST
	 43- 46   i4	Depth (Meters)
	 50- 50   a1	C-Solutions from individual traps combined and
	                  replicate subsamples drawn from this solution.
	                I-Individual traps sampled as replicates.
			W-Swimmers picked out before analyzed.
			O-Some other (special?) treatment.
	 53- 58 f6.1	Carbon (mg/m2/d)
	 61- 66 f6.1	  Standard Deviation presented where n=3
	                  Difference between replicate presented where n=2
	 68- 69   i2	  Number of replicate samples collected for
                          replicate analysis.
	 71- 76 f6.2	Nitrogen (mg/m2/d)
	 79- 84 f6.2	  Standard Deviation presented where n=3
	                  Difference between replicate presented where n=2
	 86- 87   i2	  Number of replicate samples collected for
                          replicate analysis.
	 89- 94 f6.3	Phosphorus (mg/m2/d)
	 97-102 f6.3	  Standard Deviation presented where n=3
	                  Difference between replicate presented where n=2 
	104-105   i2	  Number of replicate samples collected for
                          replicate analysis.
	107-112 f6.1	Mass (mg/m2/d)
	115-120 f6.1	  Standard Deviation presented where n=3
	                  Difference between replicate presented where n=2
	122-123   i2	  Number of replicate samples collected for
                          replicate analysis.
	125-130 f6.3	Silica (mg/m2/d)
	133-138 f6.3	  Standard Deviation presented where n=3
	                  Difference between replicate presented where n=2
	140-141   i2	  Number of replicate samples collected for
                          replicate analysis.
        143-148 f6.2	Delta-15N of PN (permil vs. air-N2)
	151-156 f6.2	  Standard Deviation presented where n=3
	                  Difference between replicate presented where n=2
	158-159   i2	  Number of replicate samples collected for
                          replicate analysis.
	161-166 f6.2	Delta-13C of PC (permil vs. VPDB)
	169-174 f6.2	  Standard Deviation presented where n=3
	                  Difference between replicate presented where n=2
	176-177   i2	  Number of replicate samples collected for
                          replicate analysis.
	179-184 f6.2	Particulate Inorganic Carbon (mg/m2/d)
	187-192 f6.2	  Standard Deviation presented where n=3
	                  Difference between replicate presented where n=2
	194-195   i2	  Number of replicate samples collected for
                          replicate analysis.


Addendum - PPO4 protocol (April 7, 2015)

The method used for the analysis of particulate phosphate (PPO4) has been modified 
and applied to samples analyzed November 2011 (HOT 236) to the present. The previous 
protocol was in use over at least the previous 10-year period.

The modified procedure included vortexing of the sample prior to a longer leaching 
time (1 hour versus 30 min) of the GFF filter in 0.15 N HCl at room temperature. 

Both the previous and modified procedures were tested in paired analyses on samples 
collected over one year (12 cruises). The modified procedure resulted in higher yields 
by approximately 50% for water column samples (integrated 0-100 m: old method 1.00±0.27 
mmol P m-2, versus 1.56±0.14 mmol P m-2) and approximately 30% for P-flux estimated 
from sediment trap samples (old method: 0.31±0.07 mg P m-2 d-1 versus 
0.40±0.09 mg P m-2 d-1).  

Please see the HOT Data Report 2012 for more detail.