sinkpart

Data Object sinking particles

contact PIs:

name	title
Dr Yukihiro Nojiri	Principal Investigator

Dataset description

SEEDS 2001 Sinking Particles
mass flux (average of 4 cups) for each depth and each deployment.
POC and PON (used to calculate C and N flux).
Metals (by ICP-AES)
- Al, Ca, Fe, Mg, Mn, P, Sr, Ti, and Zn on dry material
- Ba, Cr, Cu also measured but subject to analytical problems.
- Na, K, S used to check seasalt mass balance.
Si also measured (but on different filter to metals).
d13C

Acquisition description

Traps were suspended from each of the buoys:
- CENTRE: 20 m
- IN: 40, 60, 100, 200 m
- OUT: 20, 40, 60 and 100 m

Traps were recovered several times.

Deployment times (days):
- CENTRE: 3.95, 2.83, 2.02, 1.98, 1.93, 2.05
- IN: 3.99, 2.84, 2.03, 2.00, 1.95, 2.01
- OUT: 5.17, 3.97, 3.42

Notes from original xls file: Sinking_particles.xls
Drifting sediment trap experiment by CREST/NIES

(dm) 105 lines of comments before data begins.
(dm) all comments except 7 lines prefaced with (dm) are copied from original file.
Comments (dm) by fcsv file compiler

(dm) NOTE that I traps 200m data collected with different style (Aono type trap)

Cylindrical sediment trap of Knauer design was used.
Eight traps deployed on each cross-frame.
The cylindrical trap is separable into upper cylinder and bottom cup.
The upper cylinder has a baffle at the open end. (see picture)
(DMO Note: No picture enclosed)

All the traps was filled with a high density gradient solution
(approximately 39 permil containing 2 % formalin).
The solution was prepared with filtered seawater sampled nearby
station of the Fe infusion and NaCl was added.
At the deployment of the trap half volume of the high density solution
might be replaced with surrounding seawater.
Center drifter was deployed to locate the center of Fe patch which had
20 m depth trap positioning buoys radar reflector and drogue.
Inside drifter was deployed at the distance of 0.3 mile from the center
drifter which had 40 60 100 and 200 m depth traps positioning buoys and radar reflector.
Outside drifter was deployed at the distance of 20 mile from the center
drifter which had 20 40 60 and 100 m depth traps positioning buoys and radar reflector.
Trap design of 200 m depth was different (0.16 m in diameter and 4 traps on a frame).
The detail of the design is described in Th234 data set file.

20 m trap sample of center drifter in Run 2 was lost by an accidental event at deck recovery.
20 m trap of center drifter in Run 4 was lost because of the breakage of hydro wire.

Recovered sample in the bottom cup was transferred into 500 mL polystyrene bottle.
Formalin was added at final concentration of 5 % for preservation until on shore analysis.
The folmalin used was neutralized with sodium borate (Borax).
Large zooplankton (swimmer was removed under microscope.

Regular design traps (Knauer type)
- 1: For microscopic analysis
- 2-3: Nuclepore for biogenic Si analysis
- 4: Nuclepore for metallic element analysis
- 5: Nuclepore for spare
- 6: GF/F for C N analysis by Carlo Erba elemental analyzer (EA1110)
- 7: GF/F for C13 analysis of organic carbon by Delta Plus
(Finnigan MAT combined with the Carlo Erba elemental analyzer)
- 8: GF/F for spare

Size of the filters were 47mm in diameter and pore size of Nuclepore filter was 0.6 micro meter.
Pre-weighted filter was used for filtration.
The pre-weighting procedure was identical to the sample weighting.
Filter with trapped material was immediately frozen in -30 degree C freezer.
Filters were dried in a vacuum freeze dryer.
After drying the filter it was kept in a clean balance room controlled at 23 degree C and 50 % humidity.
The reproducibility of the weight measurement was 0.05 mg for each filter.
Total mass flux was calculated from 4 replicate measurement of Nuclepore filters.
The weight of GF/F samples were also measured however the stability of the weight
was poorer than that of Nuclepore filter.
For C/N analysis GF/F filter was fumed in a desiccator containing conc.
HCl to vaporize the inorganic carbon.

Trap dimensions:
- Length (L) m 0.63
- Inside diameter (Di) m 0.07
- Outside diameter (Do) m 0.075
- Aspect ratio (AR) 8.86
- Collection area (A) m2 0.00385
- Trap volume (V) m3 0.00239
- Trap volume (V) litres 2.386
- Baffle length (Lb) m 0.076
- Baffle diameter (Dib) m 0.013
- Baffle aspect ratio (ARb) 5.85

Aono type trap (used I traps at 200 m only collection area 0.020106 m2
Trap collection area 0.003848 m2

Processing description

Notes from original xls file: Sinking_particles.xls
Total mass flux measurement
Nuclepore filter weight with sample was measured for 4 cups from
one depth of the drifting sediment trap.

CN analysis
No. 6 GF/F filter was used for CN analysis. of (DMO Note: ????)
The filters were freeze-dried and then inorganic carbon was
removed by an acid treatment in (DMO Note: ????)
The filters were freeze-dried and then fumed in desiccator with
conc. HCl for 4-5 hours to remove inorganic carbon.
Organic carbon and nitrogen were analyzed by EA1110 elemental analyzer
(Carlo Erba) calibrated with acetoanilide (C8H9NO) standard reagent.
C and N fluxes were calculated from mg yield of C and N with collection
area of the trap and drifting period.

ICPAES analysis of trapped material of drifting sediment trap acid
digestion by HNO3/HClO4/HF ppm (mg/kg in dry wt.
Nuclepore filter with sample was enclosed in a double sealed Teflon
digestion vessel with stainless steel outer jacket with 2 ml HNO3 and 1ml HClO4.
The digestion vessel was heated at 150 degree C for 7 hours to decompose organic material.
One ml of HF was added into the Teflon vessel and silicate was decomposed on a hot plate.
The final weight of sample solution was adjusted to 4 g and served to
ICP atomic emission spectrometric analysis.
Blank was corrected from with the results of the same procedure only
using blank Nuclepore filter and acid reagents.
Nippon Jarrel Ash type ICAP750 was used for the ICPAES analysis.

Biogenic Si was measured using different Nuclepore filter with that for metallic element analysis.
Nuclepore filter with trapped material was treated with 0.5 M Na2CO3 solution for 3 hours at 85 degree C.
The extracted biogenic Si was measured by ICPAES same as metallic elements.
Samples for 200 m depth (from Aono type trap had different history from other depths.
Samples other than 200 m preserved under neutralized pH formalin solution
and applied swimmer picking out procedure were filtered within two months after recovery.
Because 200 m trap has two sample cups samples were divided after five
months of recovery and served for ICP analysis for Si and other elements.
C/N analysis fo samples for 200 m depth was done in similar period with other depths.
The total mass of 200 m analysis suming up for C N Si and elements are significantly smaller than 100 %.
These results are not accurate than other depths.
Filter weight is that of the digested filter different from the average of four Nuclepore filter.

Al Ca Fe Mg Mn P Sr Ti Zn This element group was well within ICPAES measurement range with minimum blank correction.
The element group (Ba Cr Cu and Na K Shas analytical problem relating to blank correction and digestion efficiency
B comes from preservative.
Na K and S are nominated to check analytical accuracy to sum up the total mass
which usually comes from seawater components.

Elemental flux was calculated from concentration of the element multiplied by
the total mass flux estimated from the trapped material weight on the four Nuclepore filter.
Calculated sum of all the elements well agree with 100 %.
Silicate Ca was estimated using crustal abundance of Ca to Al and the rest of Ca was estimated as carbonate.
Inorganic carbon was estimated from the carbonate calcium.
The total sum of elements other than 200 m samples are excellent.
Preservation for 200 m samples might not be good.
(dm) mass check calculations assume element in stated form.
(dm) calculatedMass = flux / atomic mass element * molecular mass stated form

Isotope analysis of organic carbon of trapped material
No. 7 GF/F filter for each trap was served for carbon isotopic analysis by
Carlo Erba elemental analyzer (EA1110) combined with a mass spectrometer (Delta Plus Finniga MAT).
The filter was fumed by HCl.
Filter used indicates the division of sample served for combustion furnace of the elemental analyzer.
MCC is Mass Check Calculation (added to params toward end of records

BCO-DMO Processing Notes
CSV file generated by Doug Mackie from original spreadsheet Sinking_particles.xls

BCO-DMO Edits
- Parameter names modified to conform to BCO-DMO convention
- lat/lon for deployment and recovery added from buoy drift data

Field Names List

Parameter	Description	Units
trap	trap	text
depth	depth	meters
date_start	date Trap deployment JST	YYYYMMDD
time_start	time Trap deployment JST	HHMM
lon_start	longitude of Trap deployment (negative denotes West)	decimal degrees
lat_start	latitude of Trap deployment (negative denotes South)	decimal degrees
date_end	date Trap recovery JST	YYYYMMDD
time_end	time Trap recovery JST	HHMM
lon_end	longitude of Trap recovery (negative denotes West)	decimal degrees
lat_end	latitude of Trap recovery (negative denotes South)	decimal degrees
Drifting_period	Drifting period days	decimal days
mass_Cup2	mass Cup 2	mg
mass_Cup3	mass Cup 3	mg
mass_Cup4	mass Cup 4	mg
mass_Cup5	mass Cup 5	mg
mass_avg	mass avg	mg
mass_st_dev	mass st dev	mg
mass_RSD_percent	mass RSD percent	percentage
mass_flux	mass flux	mg/m2/day
PON	PON	mg
POC	POC	mg
N_flux	N flux	mg/m2/day
C_flux	C flux	mg/m2/day
metals_filter_number	metals filter number	integer
dry_wt	dry wt	mg
Al	Al	mg/kg
Ca	Ca	mg/kg
Fe	Fe	mg/kg
Mg	Mg	mg/kg
Mn	Mn	mg/kg
P	P	mg/kg
Sr	Sr	mg/kg
Ti	Ti	mg/kg
Zn	Zn	mg/kg
B	B	mg/kg
Ba	Ba	mg/kg
Cr	Cr	mg/kg
Cu	Cu	mg/kg
Na	Na	mg/kg
K	K	mg/kg
S	S	mg/kg
Silica_filter_number	Silica filter number	integer
silica_filter_dry_wt	silica filter dry wt	mg
Si_percent	Si percent	percentage
total_mass_flux	total mass flux	mg/m2/day
N_mass_flux	N mass flux	mg/m2/day
C_mass_flux	C mass flux	mg/m2/day
Si_mass_flux	Si mass flux	mg/m2/day
Al_mass_flux	Al mass flux	mg/m2/day
Ca_mass_flux	Ca mass flux	mg/m2/day
Fe_mass_flux	Fe mass flux	mg/m2/day
Mg_mass_flux	Mg mass flux	mg/m2/day
Mn_mass_flux	Mn mass flux	mg/m2/day
P_mass_flux	P mass flux	mg/m2/day
Sr_mass_flux	Sr mass flux	mg/m2/day
Ti_mass_flux	Ti mass flux	mg/m2/day
Zn_mass_flux	Zn mass flux	mg/m2/day
B_mass_flux	B mass flux	mg/m2/day
Ba_mass_flux	Ba mass flux	mg/m2/day
Cr_mass_flux	Cr mass flux	mg/m2/day
Cu_mass_flux	Cu mass flux	mg/m2/day
Na_mass_flux	Na mass flux	mg/m2/day
K_mass_flux	K mass flux	mg/m2/day
S_mass_flux	S mass flux	mg/m2/day
Crustal_Ca_mass_flux	Crustal Ca mass flux	mg/m2/day
carb_Ca_mass_flux	carb Ca mass flux	mg/m2/day
Inorganic_C_mass_flux	Inorganic C mass flux	mg/m2/day
C_to_N	C/N ratio	dimensionless
C_to_P	C/P ratio	dimensionless
N_to_P	N/P ratio	dimensionless
C_to_Si	C/Si ratio	dimensionless
CO3_to_C	CO3/C ratio	dimensionless
MCC_Inorg_CO3	Mass Check Calculation for Inorg CO3	tbd
MCC_NH2	Mass Check Calculation for NH2	tbd
MCC_CH2O	Mass Check Calculation for CH2O	tbd
MCC_SiO2	Mass Check Calculation for SiO2	tbd
MCC_Al2O3	Mass Check Calculation for Al2O3	tbd
MCC_Ca	Mass Check Calculation for Ca	tbd
MCC_Fe2O3	Mass Check Calculation for Fe2O3	tbd
MCCO	Mass Check Calculation for O	tbd
MCC_PO4	Mass Check Calculation for PO4	tbd
MCC_ZnO	Mass Check Calculation for ZnO	tbd
MCC_BO3	Mass Check Calculation for BO3	tbd
MCC_NaCl	Mass Check Calculation for NaCl	tbd
MCC_KCl	Mass Check Calculation for KCl	tbd
MCC_SH2	Mass Check Calculation for SH2	tbd
MCC_total_element_mass_calculated	Mass Check Calculation for total element mass calculated	tbd
MCC_calculated_mass_minus_actual_mass	Mass Check Calculation for calculated mass-actual mass	tbd
MCC_mass_percent_excess	Mass Check Calculation for mass percent excess	percentage
d13C_filter_used	d13C filter used	text
delta_C13	delta C13	tbd

Platforms List

R/V Kaiyo-maru KY0103-02

Instruments List

Sediment Trap:

This document is created from the content of the BCO-DMO metadata database. 2010-09-02 21:40:45

info app: /home/bco/dbase-v2 v.100108 CLC
Data URL: http://data.bco-dmo.org/jg/serv/BCO/Fe_Synthesis/SEEDS/SEEDS_2001/sinkpart.