U.S. Department of the Interior

U.S. Geological Survey

Weekly Resolution Particulate Flux from a Sediment Trap in 

the Northern Gulf of Mexico, 2008-2012

By Julie N. Richey, Caitlin E. Reynolds, Eric Tappa, and Robert Thunell

Open-File Report 2014–1035
U.S. Department of the Interior

SALLY JEWELL, Secretary

U.S. Geological Survey

Suzette M. Kimball, Acting Director

U.S. Geological Survey, Reston, Virginia: 2014

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items must be secured from the copyright owner.

Suggested citation: 

Richey, J.N., Reynolds, C.E., Tappa, Eric, and Thunell, Robert, 2014, Weekly resolution 

particulate flux from a sediment trap in the northern Gulf of Mexico: U.S. Geological Survey 

Open-File Report 2014-1035, 9 p,, http://dx.doi.org/10.3133/ofr20141035. 

ISSN 2331-1258 (online)
iii

Contents

Introduction............................................................................................................................................................... 1

Materials and Methods ............................................................................................................................................. 1

Acknowledgments .................................................................................................................................................... 2

References Cited...................................................................................................................................................... 2

Figures

1. Average daily flux of 7- to 14-day-long sampling intervals of total mass flux and Organic Carbon (orgC) Flux for 

2008–2012 ..................................................................................................................................................... 3

2. Average daily flux of 7-day-long sampling intervals of Calcium Carbonate (CaCO3), Opal, Terrinegous (Terrig), 

and Nitrogen (Nitro) for 2008.......................................................................................................................... 4

Tables

1. Average daily fluxes of total mass, Organic Carbon (orgC), Calcium Carbonate (CaCO3), Opal, Terrinegous 

(Terrig), and Nitrogen (Nitro) for 2008-2012. ................................................................................................. 5
iv

Conversion Factors

Multiply By To obtain

Length

centimeter (cm) 0.394 inch (in.)

millimeter (mm) 0.039 inch (in.)

meter (m) 3.281 foot (ft)

kilometer (km) 0.621 mile (mi)

meter (m) 1.094 yard (yd)

Area

square centimeter (cm2) 0.001 square foot (ft2)

square meter (m2) 10.76 square foot (ft2)

square centimeter (cm2) 0.155 square inch (ft2)

Volume

liter (L) 33.82 ounce, fluid (fl. oz)

liter (L) 2.113 pint (pt)

liter (L) 1.057 quart (qt)

liter (L) 0.264 gallon (gal)

cubic meter (m3) gallon (gal)

cubic meter (m3) 35.31 cubic foot (ft3)

cubic meter (m3) 1.308 cubic yard (yd3)

Mass

gram (g) 0.035 ounce, avoirdupois (oz)

kilogram (kg) 2.205 pound avoirdupois (lb)

Pressure

kilopascal (kPa) 0.010 atmosphere, standard (atm)

Energy

joule (J) 0.000 kilowatthour (kWh)

Radioactivity

becquerel per liter (Bq/L) 27.027 picocurie per liter (pCi/L)

Temperature in degrees Celsius (°C) may be converted to degrees Fahrenheit (°F) as follows: 

°F=(1.8×°C)+32

Temperature in degrees Fahrenheit (°F) may be converted to degrees Celsius (°C) as follows: 

°C=(°F–32)/1.8

264.2 
1

Weekly Resolution Particulate Flux from a Sediment Trap in 

the Northern Gulf of Mexico, 2008-2012

By Julie N. Richey, Caitlin E. Reynolds, Eric Tappa, and Robert Thunell

Introduction

The U.S. Geological Survey anchored a sediment trap in the northern Gulf of Mexico to collect time-series data on sediment flux from 2008 to 2012. There are continuous measurements of total 

mass flux and organic carbon flux (orgC) at 7–14 day resolution from 2008 to 2012. The flux of calcium 

carbonate (CaCO3), particulate nitrogen (nitro), and biogenic silica (Opal) were also measured from 

January-December, 2008. The mass flux ranged from 0.01 g m-2 day-1 (grams per square meter per day ) 

to 2.50 g m-2 day-1, with a mean mass flux of 0.20 g m-2day-1 over the 5-year study period. 

Materials and Methods

A McLane PARFLUX Mark 78 automated sediment trap was deployed in early January 2008 

in approximately 1,150 meters (m) of water depth at 27.5 oN. latitude and 90.3 oW. longitude. The trap 

was positioned at a depth of 700 m on the sediment trap mooring (Spear and Poore, 2010). The trap is 

equipped with 21 collection cups, all mounted on a rotating plate programmed to rotate every 7 to 14 

days (representative of a 1- or 2-week collection period). Sample cups from the period of January 2008 

to late May 2009 were prefilled with a buffered formalin solution made with filtered (0.44-micrometer 

(m) filter) seawater, with a salinity of approximently 33 psu (practical salinity units). However, from 

September 2009 to the present, sample cups were prefilled with a density-gradient solution with a salinity of approximately 44 psu. Formalin (3.7 percent) and sodium borate are added to the density-gradient 

solution to poison, buffer and preserve the samples. The trap was recovered and redeployed every 3 

months during 2008, and every 6-9 months thereafter. Sampling gaps occurred between late May 2009 

and late September 2009, and between early February 2012 and late March 2012, due to scheduling 

problems. Nine samples from the weeks of March 17, April 7, May 5, October 22, November 19, and 

December 10 of 2009, and January 7, February 14 and February 24 of 2010 were not recovered due to 

loss of the collection cups during deployment and recovery. During visits to the trap site, water column 

profiles of conductivity (salinity), temperature, and depth were collected using a Sea-Bird Electronics 

SBE9plus (Reynolds and others, 2013). Foraminiferal assemblage composition and flux were determined from sediment trap data and published in separate reports (Reynolds and others, 2013, Poore and 

others, 2013).

Sediment-trap samples were wet-split into four aliquots using a precision rotary splitter at the 

University of South Carolina, stored in buffered, deionized water, and then refrigerated. Mass flux was 

determined by taking a quarter split of each cup sample, freeze drying each quarter, and then determining mass using a microbalance. All flux measurements are reported in grams per square meter per day 

(g m-2 day-1). To determine organic carbon and nitrogen content, aliquots of the mass flux were rinsed 

with 1 N phosphoric acid to remove carbonates. Carbon and nitrogen content on the carbonate-free aliquots was determined via high-temperature combustion using a PerkinElmer 2400 Elemental Analyzer. 

Carbonate concentrations were determined with an automated acid digestion system similar to that 
2

described in Ostermann (1990). Biogenic Opal was quantified by the wet chemical leaching technique 

outlined in Mortlock and Froelich (1989). Terrigenous flux (Terrig) was calculated after accounting for 

Opal, CaCO3, and organic matter; the organic matter flux was extrapolated from organic carbon flux by 

assuming that the orgC flux accounted for 40 percent of the total organic matter.

Acknowledgments

This research was funded by the U.S. Geological Survey Climate and Land Use Research and 

Development program.

References Cited

Mortlock, R.A., and Froelich, P.N., 1989, A simple method for the rapid determination of biogenic opal 

in pelagic marine sediments: Deep-Sea Research Part A. Oceanographic Research Papers, v. 36, no. 9, 

p.1415–1426. [Also available at http://dx.doi.org/10.1016/0198-0149(89)90092-7.]

Ostermann, D.R., Karbott, Darrell, and Curry, W.B., 1990, Automated system to measure the carbonate 

concentration of sediments: Woods Hole, Mass., Woods Hole Oceanographic Institute, Technical 

Report WHOI-90-03. [Also available at http://dx.doi.org/10.1575/1912/998.]

Poore, R.Z., Tedesco, K.A., and Spear, J.W., 2013, Seasonal flux and assemblage composition of 

planktic foraminifers from a sediment-trap study in the northern Gulf of Mexico: Journal of Coastal 

Research, special issue no. 63, p. 6–19. [Also available at http://dx.doi.org/10.2112/SI63-002.1.] 

Reynolds, C.E., Richey, J.N., and Poore, R.Z., 2013, Seasonal flux and assemblage composition of 

planktic foraminifera from the northern Gulf of Mexico, 2008–12: U.S. Geological Survey Open-File 

Report 2013-1243, 13 p. [Also available at http://pubs.usgs.gov/of/2013/1243/.]

Spear, J.W., and Poore, R.Z., 2010, Gulf of Mexico climate-history calibration study: U.S. Geological 

Survey Fact Sheet 2010–3044, 2 p. [Also available at http://pubs.usgs.gov/fs/2010/3044/.]
3

Figure 1. Average daily flux of 7– to 14–day-long sampling intervals of total mass flux and Organic Carbon (orgC) Flux for 

2008–2012. Note the scale change in the y-axis. The tick marks on the x-axis denote the first day of each month. There was a 

gap in sampling (red rectangles), loss of sample cups (red inverted triangles), and limited data for processing (red triangles). 

Green triangle indicates Deepwater Horizon oil spill in 2010. The thick black lines represent 14 day sampling. Total Mass Flux (grams m-2 day -1 )

J F M A M J J A S O N D

2008

2009

2010

2011

2012

0.00

0.25

0.50

0.75

1.00

1.25

1.50

0.00

0.25

0.50

0.75

1.00

1.25

1.50

0.00

0.25

0.50

0.75

1.00

1.25

1.50

0.00

0.25

0.50

0.75

1.00

1.25

1.50

0.00

0.25

0.50

0.75

1.00

1.25

1.50

No data

1.72

2.49

orgC Flux (grams m-2 day -1 )

J F M A M J J A S O N D

2008

2009

2010

2011

2012

0.000

0.008

0.016

0.024

0.032

0.040

No data

0.048

0.000

0.008

0.016

0.024

0.032

0.040

0.048

0.000

0.008

0.016

0.024

0.032

0.040

0.048

0.000

0.008

0.016

0.024

0.032

0.040

0.048

0.000

0.008

0.016

0.024

0.032

0.040

0.048

0.053

0.063

0.060 0.081
4

Figure 2. Average daily flux of 7-day-long sampling intervals of Calcium Carbonate (CaCO3), Opal, Terrinegous (Terrig), and 

Nitrogen (Nitro) for 2008. Note the scale change in the y-axis. The tick marks on the x-axis denote the first day of each month. 

0.000

0.025

0.050

0.075

0.100

0.125

CaCO3 Flux (grams m-2 day -1 ) OPAL Flux (grams m-2 day -1 )

Terrig Flux (grams m-2 day -1 ) Nitro Flux (grams m-2 day -1 )

0.000

0.008

0.016

0.024

0.032

0.040

0.048

0.000

0.015

0.030

0.045

0.060

0.075

0.090

0.00

4.00e-4

8.00e-4

1.20e-3

1.60e-3

 2.00e-3

J F M A M J J A S O N D

J F M A M J J A S O N D

J F M A M J J A S O N D

J F M A M J J A S O N D

2008

2008

2008

2008
5

Table 1. Average daily fluxes of total mass, Organic Carbon (orgC), Calcium Carbonate (CaCO3), Opal, Terrinegous (Terrig), and Nitrogen (Nitro) 

for 2008-2012. 

[GMT, Gulf of Mexico Sediment Trap; OPAL, opaline]

Sample Mid-Week date Total Mass Flux 

(g/m 2/day)

orgC Flux 

(gC/m 2/day)

CaCO3Flux 

(g/m 2/day)

OPAL Flux 

(g/m 2/day)

Terrig Flux 

(g/m 2/day)

Nitro Flux 

(g/m 2/day)

GMT-1 1 17-Jan-08 0.1509 0.0122 0.069 0.032 0.019 0.0018

GMT-1 2 24-Jan-08 0.1291 0.0065 0.079 0.014 0.020 0.0010

GMT-1 3 31-Jan-08 0.2760 0.0125 0.112 0.046 0.087 0.0016

GMT-1 4 7-Feb-08 0.2389 0.0113 0.106 0.037 0.067 0.0016

GMT-1 5 14-Feb-08 0.1914 0.0120 0.082 0.031 0.048 0.0018

GMT-1 6 21-Feb-08 0.1146 0.0097 0.051 0.017 0.023 0.0017

GMT-1 7 28-Feb-08 0.1403 0.0081 0.076 0.019 0.026 0.0012

GMT-1 8 6-Mar-08 0.1509 0.0084 0.082 0.023 0.024 0.0012

GMT-1 9 13-Mar-08 0.1571 0.0098 0.099 0.019 0.014 0.0017

GMT-1 10 20-Mar-08 0.0914 0.0066 0.061 0.012 0.001 0.0011

GMT-1 11 27-Mar-08 0.1411 0.0077 0.103 0.014 0.005 0.0013

GMT-1 12 3-Apr-08 0.0909 0.0041 0.068 0.010 0.003 0.0007

GMT-1 13 10-Apr-08 0.0891 0.0083 0.056 0.010 0.003 0.0017

GMT-1 14 17-Apr-08 0.0720 0.0069 0.034 0.013 0.008 0.0010

GMT-2 1 24-Apr-08 0.0640 0.0066 0.032 0.011 0.005 0.0012

GMT-2 2 1-May-08 0.0960 0.0046 0.070 0.010 0.004 0.0007

GMT-2 3 8-May-08 0.0389 0.0040 0.021 0.006 0.002 0.0007

GMT-2 4 15-May-08 0.0423 0.0036 0.023 0.006 0.004 0.0006

GMT-2 5 22-May-08 0.0411 0.0035 0.023 0.004 0.005 0.0006

GMT-2 6 29-May-08 0.0640 0.0049 0.026 0.007 0.019 0.0008

GMT-2 7 5-Jun-08 0.1314 0.0066 0.034 0.016 0.065 0.0009

GMT-2 8 12-Jun-08 0.0240 0.0017 0.011 0.002 0.006 0.0003

GMT-2 9 19-Jun-08 0.0697 0.0058 0.028 0.008 0.019 0.0009

GMT-2 10 26-Jun-08 0.0354 0.0033 0.014 0.002 0.011 0.0008

GMT-2 11 3-Jul-08 0.0571 0.0044 0.021 0.006 0.020 0.0007

GMT-2 12 10-Jul-08 0.0537 0.0041 0.021 0.006 0.016 0.0006

GMT-2 13 17-Jul-08 0.1280 0.0089 0.051 0.014 0.041 0.0014

GMT-2 14 24-Jul-08 0.1040 0.0074 0.045 0.013 0.028 0.0010

GMT-3 1 3-Aug-08 0.0983 0.0103

GMT-3 2 10-Aug-08 0.0617 0.0069

GMT-3 3 17-Aug-08 0.1166 0.0046

GMT-3 4 24-Aug-08 0.1360 0.0086

GMT-3 5 31-Aug-08 0.1177 0.0103

GMT-3 6 7-Sep-08 0.1360 0.0138

GMT-3 7 14-Sep-08 0.1086 0.0048

GMT-3 8 21-Sep-08 0.0754 0.0042

GMT-3 9 28-Sep-08 1.2709 0.0271

GMT-3 10 5-Oct-08 2.4937 0.0599

GMT-3 11 12-Oct-08 0.5749 0.0170

GMT-3 12 19-Oct-08 0.8583 0.0186
6

Sample Mid-Week date Total Mass Flux 

(g/m 2/day)

orgC Flux 

(gC/m 2/day)

CaCO3Flux 

(g/m 2/day)

OPAL Flux 

(g/m 2/day)

Terrig Flux 

(g/m 2/day)

Nitro Flux 

(g/m 2/day)

GMT-4 1 29-Oct-08 1.3829 0.0373

GMT-4 2 5-Nov-08 0.0994 0.0125

GMT-4 3 12-Nov-08 0.2137 0.0087

GMT-4 4 19-Nov-08 0.2480 0.0119

GMT-4 5 26-Nov-08 0.2983 0.0139

GMT-4 6 3-Dec-08 0.6594 0.0807

GMT-4 7 10-Dec-08 0.4446 0.0152

GMT-4 8 17-Dec-08 0.1703 0.0086

GMT-4 9 24-Dec-08 0.3189 0.0094

GMT-4 10 31-Dec-08 0.8594 0.0228

GMT-4 11 6-Jan-09 0.4120 0.0152

GMT-5 1 12-Jan-09 0.2661 0.0093

GMT-5 2 19-Jan-09 0.2871 0.0128

GMT-5 3 26-Jan-09 0.0877 0.0056

GMT-5 4 2-Feb-09 0.1317 0.0054

GMT-5 5 9-Feb-09 0.1107 0.0045

GMT-5 6 16-Feb-09 0.1318 0.0071

GMT-5 7 23-Feb-09 0.0573

GMT-5 8 2-Mar-09 0.2475 0.0084

GMT-5 9 9-Mar-09 0.1253 0.0057

GMT-5 10 16-Mar-09

GMT-5 11 23-Mar-09 0.1279 0.0055

GMT-5 12 30-Mar-09 0.1365 0.0056

GMT-5 13 6-Apr-09

GMT-5 14 13-Apr-09 0.3178 0.0186

GMT-5 15 20-Apr-09 0.1288 0.0064

GMT-5 16 27-Apr-09 0.0592 0.0050

GMT-5 17 4-May-09

GMT-5 18 11-May-09 0.1630 0.0057

GMT-5 19 18-May-09 0.0849 0.0042

GMT-5 20 24-May-09 0.0445

GMT-6 1 30-Sep-09 0.0097

GMT-6 2 7-Oct-09 0.0994

GMT-6 3 14-Oct-09 0.0259

GMT-6 4 21-Oct-09

GMT-6 5 28-Oct-09 0.0730 0.0031

GMT-6 6 4-Nov-09 0.1805 0.0114

GMT-6 7 11-Nov-09 0.0832 0.0043

GMT-6 8 18-Nov-09

GMT-6 9 25-Nov-09 1.7211 0.0630

GMT-6 10 2-Dec-09 0.9675 0.0285

GMT-6 11 9-Dec-09
7

Sample Mid-Week date Total Mass Flux 

(g/m 2/day)

orgC Flux 

(gC/m 2/day)

CaCO3Flux 

(g/m 2/day)

OPAL Flux 

(g/m 2/day)

Terrig Flux 

(g/m 2/day)

Nitro Flux 

(g/m 2/day)

GMT-6 12 16-Dec-09 0.5563 0.0149

GMT-6 13 23-Dec-09 0.5449 0.0177

GMT-6 14 30-Dec-09 1.1707 0.0323

GMT-6 15 6-Jan-10

GMT-6 16 13-Jan-10 1.3810 0.0371

GMT-6 17 20-Jan-10 0.9555 0.0329

GMT-6 18 31-Jan-10 0.3169 0.0176

GMT-6 19 14-Feb-10

GMT-6 20 24-Feb-10

GMT-6 21 3-Mar-10 0.1126 0.0086

GMT-7 1 17-Mar-10 0.2446 0.0134

GMT-7 2 31-Mar-10 0.2172 0.0158

GMT-7 3 10-Apr-10 0.2097 0.0166

GMT-7 4 17-Apr-10 0.1821 0.0124

GMT-7 5 24-Apr-10 0.1320 0.0107

GMT-7 6 1-May-10 0.0530 0.0065

GMT-7 7 8-May-10 0.1003 0.0210

GMT-7 8 15-May-10 0.1502 0.0144

GMT-7 9 22-May-10 0.1259 0.0094

GMT-7 10 29-May-10 0.0959 0.0072

GMT-7 11 5-Jun-10 0.0920 0.0058

GMT-7 12 12-Jun-10 0.0558 0.0038

GMT-7 13 19-Jun-10 0.0851 0.0058

GMT-7 14 26-Jun-10 0.2481 0.0162

GMT-7 15 3-Jul-10 0.1902 0.0146

GMT-7 16 10-Jul-10 0.0690 0.0100

GMT-7 17 19-Jul-10 0.0512 0.0040

GMT-7 18 1-Aug-10 0.1767 0.0118

GMT-7 19 15-Aug-10 0.0162 0.0016

GMT-7 20 29-Aug-10 0.0225 0.0032

GMT-7 21 12-Sep-10 0.1517 0.0095

GMT-8 1 24-Sep-10 0.3429 0.0127

GMT-8 2 1-Oct-10 0.1586 0.0109

GMT-8 3 8-Oct-10 0.1241 0.0064

GMT-8 4 15-Oct-10 0.0581 0.0042

GMT-8 5 22-Oct-10 0.0801 0.0050

GMT-8 6 29-Oct-10 0.0534 0.0029

GMT-8 7 5-Nov-10 0.0895 0.0048

GMT-8 8 12-Nov-10 0.0502 0.0037

GMT-8 9 19-Nov-10 0.0840 0.0045

GMT-8 10 26-Nov-10 0.1343 0.0064

GMT-8 11 3-Dec-10 0.1272 0.0052
8

Sample Mid-Week date Total Mass Flux 

(g/m 2/day)

orgC Flux 

(gC/m 2/day)

CaCO3Flux 

(g/m 2/day)

OPAL Flux 

(g/m 2/day)

Terrig Flux 

(g/m 2/day)

Nitro Flux 

(g/m 2/day)

GMT-8 12 10-Dec-10 0.1510 0.0097

GMT-8 13 17-Dec-10 0.1835 0.0085

GMT-8 14 24-Dec-10 0.3952 0.0135

GMT-8 15 31-Dec-10 0.2671 0.0120

GMT-8 16 7-Jan-11 0.2279 0.0127

GMT-8 17 14-Jan-11 0.3211 0.0161

GMT-8 18 19-Jan-11 0.3388 0.0123

GMT-9 1 28-Jan-11 0.2920 0.0162

GMT-9 2 11-Feb-11 0.1806 0.0089

GMT-9 3 25-Feb-11 0.1800 0.0100

GMT-9 4 7-Mar-11 0.1326 0.0064

GMT-9 5 14-Mar-11 0.0857 0.0045

GMT-9 6 21-Mar-11 0.0949 0.0046

GMT-9 7 28-Mar-11 0.1074 0.0098

GMT-9 8 4-Apr-11 0.1051

GMT-9 9 11-Apr-11 0.1440

GMT-9 10 18-Apr-11 0.0069

GMT-9 11 25-Apr-11 0.0309

GMT-9 12 2-May-11 0.0411

GMT-9 13 9-May-11 0.0789

GMT-9 14 16-May-11 0.0731 0.0129

GMT-9 15 23-May-11 0.1166 0.0043

GMT-9 16 30-May-11 0.1486 0.0089

GMT-9 17 6-Jun-11 0.1680 0.0090

GMT-9 18 17-Jun-11 0.1211 0.0113

GMT-9 19 1-Jul-11 0.0486 0.0029

GMT-9 20 15-Jul-11 0.0680 0.0076

GMT-9 21 31-Jul-11 0.0289 0.0016

GMT-10 1 21-Aug-11 0.0771

GMT-10 2 4-Sep-11 0.1137

GMT-10 3 18-Sep-11 0.0966 0.0064

GMT-10 4 2-Oct-11 0.0360 0.0017

GMT-10 5 16-Oct-11 0.1143 0.0069

GMT-10 6 26-Oct-11 0.1040 0.0042

GMT-10 7 2-Nov-11 0.0651 0.0028

GMT-10 8 9-Nov-11 0.2343 0.0076

GMT-10 9 16-Nov-11 0.0869 0.0038

GMT-10 10 23-Nov-11 0.0766 0.0041

GMT-10 11 30-Nov-11 0.0389 0.0024

GMT-10 12 7-Dec-11 0.1394 0.0088

GMT-10 13 14-Dec-11 0.0377 0.0016

GMT-10 14 21-Dec-11 0.0777 0.0034
9

Sample Mid-Week date Total Mass Flux 

(g/m 2/day)

orgC Flux 

(gC/m 2/day)

CaCO3Flux 

(g/m 2/day)

OPAL Flux 

(g/m 2/day)

Terrig Flux 

(g/m 2/day)

Nitro Flux 

(g/m 2/day)

GMT-10 15 28-Dec-11 0.2263 0.0068

GMT-10 16 4-Jan-12 0.5589 0.0177

GMT-10 17 11-Jan-12 0.1623 0.0085

GMT-10 18 18-Jan-12 0.0983 0.0064

GMT-10 19 25-Jan-12 0.0674 0.0040

GMT-10 20 1-Feb-12 0.0149

GMT-10 21 8-Feb-12 0.0206 0.0022

GMT-11 1 30-Mar-12 0.4800 0.0138

GMT-11 2 6-Apr-12 0.4469 0.0142

GMT-11 3 13-Apr-12 0.3257 0.0131

GMT-11 4 20-Apr-12 0.4743 0.0144

GMT-11 5 27-Apr-12 0.1223 0.0057

GMT-11 6 4-May-12 0.3131 0.0073

GMT-11 7 11-May-12 0.2971 0.0108

GMT-11 8 18-May-12 0.3817 0.0157

GMT-11 9 25-May-12 0.4343 0.0130

GMT-11 10 1-Jun-12 0.1931 0.0083

GMT-11 11 8-Jun-12 0.2000 0.0093

GMT-11 12 15-Jun-12 0.0857 0.0060

GMT-11 13 22-Jun-12 0.0789 0.0062

GMT-11 14 29-Jun-12 0.0926 0.0088

GMT-11 15 6-Jul-12 0.1874 0.0201

GMT-11 16 13-Jul-12 0.1794 0.0000

GMT-11 17 20-Jul-12 0.0446 0.0012

GMT-11 18 27-Jul-12 0.1874 0.0059

GMT-11 19 3-Aug-12 0.1520 0.0047

GMT-11 20 10-Aug-12 0.4000 0.0200

GMT-11 21 21-Aug-12 0.0011 0.0000

GMT-12 1 22-Aug-12 0.0280

GMT-12 2 5-Sep-12 1.1669 0.0531

GMT-12 3 19-Sep-12 0.3314 0.0130

GMT-12 4 3-Oct-12 0.2749 0.0112

GMT-12 5 17-Oct-12 0.1640 0.0095

GMT-12 6 31-Oct-12 0.2240 0.0099

GMT-12 7 10-Nov-12 0.1543 0.0046

GMT-12 8 17-Nov-12 0.0731 0.0032

GMT-12 9 24-Nov-12 0.1349 0.0060

GMT-12 10 1-Dec-12 0.0480 0.0014

GMT-12 11 8-Dec-12 0.0263

GMT-12 12 15-Dec-12 0.0377

GMT-12 13 22-Dec-12 0.0480

GMT-12 14 29-Dec-12 0.0697 0.0019
Richey and others—Weekly Resolution Particulate Flux from a Sediment Trap in the Northern Gulf of Mexico, 2008-2012—Open-File Report 2014–1035

ISSN 2331-1258 (online)

http://dx.doi.org/10.3133/ofr20141035