| 234Th flux in epipelagic waters at Station ALOHA and the Equatorial Pacific from R/V Kilo Moana cruises KM1407, KM1418, & KM1515 during 2014-2015 | Integrated 234Th flux; BD = below detection
| Th_flux |
| 234Th flux in epipelagic waters at Station ALOHA and the Equatorial Pacific from R/V Kilo Moana cruises KM1407, KM1418, & KM1515 during 2014-2015 | Integrated 234Th flux error
| Th_flux_error |
| Seawater radioisotope (234Th) and carbon from sampling conducted at the Compass Station in Bedford Basin, Nova Scotia, Canada from April to August 2019 | RAP234 activities or the residual ? activity derived from beta counting after all unsupported 234Th has decayed away. RAP234 was first described in Lin et al. (2016). The residual background counts are reported for total particulates (large and small particle background counts were summed).
| RAp234_TPT_CONC |
| Seawater radioisotope (234Th) and carbon from sampling conducted at the Compass Station in Bedford Basin, Nova Scotia, Canada from April to August 2019 | Activity of large particle (>51 µm) thorium-234 from Niskin sampling and shipboard vacuum filtration.
| Th_234_LPT_CONC |
| Seawater radioisotope (234Th) and carbon from sampling conducted at the Compass Station in Bedford Basin, Nova Scotia, Canada from April to August 2019 | Activity of small particle (1-51 µm) thorium-234 from Niskin sampling and shipboard vacuum filtration.
| Th_234_SPT_CONC |
| Seawater radioisotope (234Th) and carbon from sampling conducted at the Compass Station in Bedford Basin, Nova Scotia, Canada from April to August 2019 | Activity of total thorium-234 from ODF rosette Niskins or above-McLane pump Niskins
| Th_234_T_CONC |
| Seawater radioisotope (234Th) and carbon from sampling conducted at the Compass Station in Bedford Basin, Nova Scotia, Canada from April to August 2019 | Uncertainty for RAp234_TPT_CONC. Propagated counting and measurement uncertainties ranged from 8% to 20%. To provide a conservative uncertainty estimate, a 20% uncertainty was applied to all values.
| Unc_RAp234_TPT_CONC |
| Seawater radioisotope (234Th) and carbon from sampling conducted at the Compass Station in Bedford Basin, Nova Scotia, Canada from April to August 2019 | Uncertainty for Th_234_LPT_CONC. Derived from counting statistics and error propagation for sample processing.
| Unc_Th_234_LPT_CONC |
| Seawater radioisotope (234Th) and carbon from sampling conducted at the Compass Station in Bedford Basin, Nova Scotia, Canada from April to August 2019 | Uncertainty for Th_234_SPT_CONC. Derived from counting statistics and error propagation for sample processing.
| Unc_Th_234_SPT_CONC |
| Seawater radioisotope (234Th) and carbon from sampling conducted at the Compass Station in Bedford Basin, Nova Scotia, Canada from April to August 2019 | Uncertainty for Th_234_T_CONC. Derived from counting statistics and error propagation for mass/volume measurements and ICP-MS recovery analysis. See report for additional details.
| Unc_Th_234_T_CONC |
| Carbon content and radioisotope data from sampling conducted at the Compass Station in Bedford Basin, Nova Scotia, Canada from February to August 2019 | Excess 234Th activity in sediments (decays per minute per gram). BD indicates that while 234Th activities were measured, the activity of 234Th determined was within the uncertainty values of the supported 234Th determined for the sediment core. Thus, the supported and measured 234Th activities are indistinguishable.
| Th_234_EX_CONC_SED |
| Carbon content and radioisotope data from sampling conducted at the Compass Station in Bedford Basin, Nova Scotia, Canada from February to August 2019 | Uncertainty for Th_234_EX_CONC_SED. Sediment uncertainties for 234Th activities are the propagation of gamma counting errors and an assessment of potential variability in porosity and density estimates.
| Unc_Th_234_EX_CONC_SED |
| Water column total and particulate Thorium-234 from Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018 | Th_234_SPT_CONC_PUMP uncertainty.
| SD1_Th_234_LPT_CONC_PUMP_ndfccj |
| Water column total and particulate Thorium-234 from Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018 | Th-234 uncertainty. Derived from counting statistics and error propagation for mass/volume measurements and ICP-MS recovery analysis.
| SD1_Th_234_SPT_CONC_PUMP_kcfgxs |
| Water column total and particulate Thorium-234 from Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018 | Th_234_LPT_CONC_PUMP uncertainty.
| SD1_Th_234_T_CONC_BOTTLE_o9yxf7 |
| Water column total and particulate Thorium-234 from Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018 | Particulate Thorium-234 from QMA filters. Particle size of 1 to 51 um. Data were decay corrected back to mid-pump times.
| Th_234_LPT_CONC_PUMP_ndfccj |
| Water column total and particulate Thorium-234 from Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018 | Total Th-234 concentration collected from Niskin bottles on the CTD rosette.
| Th_234_SPT_CONC_PUMP_kcfgxs |
| Water column total and particulate Thorium-234 from Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018 | Particulate Thorium-234 from mesh screens, filtered onto silver filters. Particle size greater than 51 um. Data were decay corrected back to mid-pump times.
| Th_234_T_CONC_BOTTLE_o9yxf7 |
| Water column total and particulate Thorium-234 from Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from October to November 2018 | Th_234_SPT_CONC_PUMP uncertainty.
| SD1_Th_234_LPT_CONC_PUMP_dpcdrs |
| Water column total and particulate Thorium-234 from Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from October to November 2018 | Th-234 uncertainty. Derived from counting statistics and error propagation for mass/volume measurements and ICP-MS recovery analysis.
| SD1_Th_234_SPT_CONC_PUMP_r3ul1b |
| Water column total and particulate Thorium-234 from Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from October to November 2018 | Th_234_LPT_CONC_PUMP uncertainty.
| SD1_Th_234_T_CONC_BOTTLE_unblcb |
| Water column total and particulate Thorium-234 from Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from October to November 2018 | Particulate Thorium-234 from QMA filters. Particle size of 1 to 51 um. Data were decay corrected back to mid-pump times.
| Th_234_LPT_CONC_PUMP_dpcdrs |
| Water column total and particulate Thorium-234 from Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from October to November 2018 | Total Th-234 concentration collected from Niskin bottles on the CTD rosette.
| Th_234_SPT_CONC_PUMP_r3ul1b |
| Water column total and particulate Thorium-234 from Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from October to November 2018 | Particulate Thorium-234 from mesh screens, filtered onto silver filters. Particle size greater than 51 um. Data were decay corrected back to mid-pump times.
| Th_234_T_CONC_BOTTLE_unblcb |
| Bottle data along with US GEOTRACES North Atlantic Transect from the R/V Knorr KN204-01 cruise in the subtropical N. Atlantic during 2011 (U.S. GEOTRACES NAT project) | TH-234
| TH234 |
| TPC, PIC, POC, TPN, and Th-234 from in-situ pumps at the Porcupine Abyssal Plain Sustained Observatory (PAP-SO) site in the Northeast Atlantic Ocean during RRS Discovery cruise DY077 in April of 2017 | particulate thorium-234 activity
| Th234_part |
| TPC, PIC, POC, TPN, and Th-234 from in-situ pumps at the Porcupine Abyssal Plain Sustained Observatory (PAP-SO) site in the Northeast Atlantic Ocean during RRS Discovery cruise DY077 in April of 2017 | particulate thorium-234 uncertainty, propagated from counting statistics. See note in Processing Description regarding QMA punch-to-punch variability.
| Th234_part_err |
| Activity percent and composition percent of radionuclides, protein, carbohydrates, and iron at various pH levels using isoelectric focusing of radionuclide-labeled EPS | 234Th exopolymeric substance extracted from diatoms cultured under Si-depleted (f/2-Si medium) conditions
| Th234_pcnt_activity_EPS_Si_minus |
| Activity percent and composition percent of radionuclides, protein, carbohydrates, and iron at various pH levels using isoelectric focusing of radionuclide-labeled EPS | 234Th exopolymeric substance extracted from diatoms cultured under Si-replete (f/2 medium) conditions
| Th234_pcnt_activity_EPS_Si_plus |
| Particulate organic carbon, nitrogen, and Thorium-234 collected during the 2012-2013 Palmer Field Season (WAP Carbon export project) | Thorium isotope 234Th adsorbed into particles.
| Particulate_Th234 |
| Particulate organic carbon, nitrogen, and Thorium-234 collected during the 2012-2013 Palmer Field Season (WAP Carbon export project) | Uncertainty in Thorium 234TH adsorbed into particles.
| Uncertainty |
| Particulate organic carbon, nitrogen, and Thorium-234 measurements collected during the 2012-2013 Palmer Field Season (WAP Carbon export project) | Uncertanty in Thorium isotope 234Th flux.
| standard_error_Th234 |
| Particulate organic carbon, nitrogen, and Thorium-234 measurements collected during the 2012-2013 Palmer Field Season (WAP Carbon export project) | Thorium isotope 234Th flux.
| Th234 |
| Size Fractionated Particulate Thorium-234 measurements collected during the 2012-2013 Palmer Field Season | Thorium isotope 234Th adsorbed onto >50-um particles.
| Particulate_Th234 |
| Size Fractionated Particulate Thorium-234 measurements collected during the 2012-2013 Palmer Field Season | Uncertainty in thorium isotope th234Th on >50-um partcles.
| Uncertainty |
| Total water column Thorium-234 measurements collected during the 2012-2013 Palmer Field Season (WAP Carbon export project) | Total water-column Thorium isotope 234Th.
| Th234 |
| Total water column Thorium-234 measurements collected during the 2012-2013 Palmer Field Season (WAP Carbon export project) | Uncertainty in thorium isotope 234Th.
| Uncertainty |
| Particulate Th data from samples collected on 5 cruises at Station ALOHA off Hawaii and Station M off California from 2019 to 2020 | Total 234Th
| Th234 |
| Particulate Th data from samples collected on 5 cruises at Station ALOHA off Hawaii and Station M off California from 2019 to 2020 | +/- error based on counting statistics and efficiency correction
| Th234_err |
| Particulate Th-234 collected using large volume McLane pumps (LVPs) as part of the EAGER chief scientist training cruise (KM1910) at Station ALOHA, subtropical North Pacific gyre in June 2019 | >51 µm Thorium-234 (large particle activity)
| Th234_LSF |
| Particulate Th-234 collected using large volume McLane pumps (LVPs) as part of the EAGER chief scientist training cruise (KM1910) at Station ALOHA, subtropical North Pacific gyre in June 2019 | 1-51 µm Thorium-234 (small particle activity)
| Th234_SSF |
| Particulate Th-234 collected with surface-tethered sediment traps at Station ALOHA as part of the EAGER chief scientist training cruise (KM1910) in the subtropical North Pacific gyre in June 2019 | Sinking flux of 234Th calculated from sediment trap samples
| Th234_Flux |
| Grain size and radiometric data from multi-core sediments collected Fall 2017 from the R/V Acadiana in the northwestern Gulf of Mexico to assess Hurricane Harvey impacts | Inventory of excess Thorium-234
| Th234ex_Inventory |
| Carbon, Nitrogen, biogenic silica, thorium-234, and mass fluxes from upper ocean sediment traps at the Porcupine Abyssal Plain Sustained Observatory (PAP-SO) site in the Northeast Atlantic Ocean during RRS Discovery cruise DY077 in April of 2017 | thorium-234 flux of split A
| Th234_f_A |
| Carbon, Nitrogen, biogenic silica, thorium-234, and mass fluxes from upper ocean sediment traps at the Porcupine Abyssal Plain Sustained Observatory (PAP-SO) site in the Northeast Atlantic Ocean during RRS Discovery cruise DY077 in April of 2017 | thorium-234 flux of split B
| Th234_f_B |
| Carbon, Nitrogen, biogenic silica, thorium-234, and mass fluxes from upper ocean sediment traps at the Porcupine Abyssal Plain Sustained Observatory (PAP-SO) site in the Northeast Atlantic Ocean during RRS Discovery cruise DY077 in April of 2017 | thorium-234 flux of split C
| Th234_f_C |
| Carbon, Nitrogen, biogenic silica, thorium-234, and mass fluxes from upper ocean sediment traps at the Porcupine Abyssal Plain Sustained Observatory (PAP-SO) site in the Northeast Atlantic Ocean during RRS Discovery cruise DY077 in April of 2017 | thorium-234 flux of split D
| Th234_f_D |
| Carbon, Nitrogen, biogenic silica, thorium-234, and mass fluxes from upper ocean sediment traps at the Porcupine Abyssal Plain Sustained Observatory (PAP-SO) site in the Northeast Atlantic Ocean during RRS Discovery cruise DY077 in April of 2017 | thorium-234 uncertainty of split A, propagated from counting statistics
| Th234_f_err_A |
| Carbon, Nitrogen, biogenic silica, thorium-234, and mass fluxes from upper ocean sediment traps at the Porcupine Abyssal Plain Sustained Observatory (PAP-SO) site in the Northeast Atlantic Ocean during RRS Discovery cruise DY077 in April of 2017 | thorium-234 uncertainty of split B, propagated from counting statistics
| Th234_f_err_B |
| Carbon, Nitrogen, biogenic silica, thorium-234, and mass fluxes from upper ocean sediment traps at the Porcupine Abyssal Plain Sustained Observatory (PAP-SO) site in the Northeast Atlantic Ocean during RRS Discovery cruise DY077 in April of 2017 | thorium-234 uncertainty of split C, propagated from counting statistics
| Th234_f_err_C |
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