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35 results for “sediment trap”
Sediment trap results from Amundsen Sea Polynya International Research Expedition (ASPIRE) including C, N and mass fluxes and isotopic composition, Dec 2010 - Dec 2011
The gravitational settling of particles is a major biogeochemical process linking the carbon cycles and ecosystems of the upper ocean, twilight zone and deep sea. Particle interceptor or sediment traps are used to collect settling particles and provide estimates of their vertical fluxes to various depths. We used a new Technicap 24-sample time series sediment trap deployed at 350 m depth in the Amundsen Sea polynya (73o 49’ S, 113o 04’ W, 2010-12.
Palmer Station VERTEX-style Sediment Trap measurements, 50 m depth, 2012-2013
Measurements were made using moored VERTEX-style particle interceptor tube (PIT) sediment traps deployed at a depth of 50-m at stations B and E near Palmer Station between Nov. 2012 and Apr. 2013. Sediment trap contents was measured to determine fluxes of POC, PN, and Th-234 on two size fractions (>200 and <200 micron). Note that these are operational size classes and may not directly coincide with the size of aggregates that may have been sinking in the water column. For more details, please see Stukel et al. (in review, Global Biogeochemical Cycles).
Shell lengths of pteropod, Limacina helicina antarctica, collected from the PAL LTER sediment trap along the Western Antarctic Peninsula, 2004 - 2018, and from net tows 2017-2018.
Pteropod, Limacina helicina antarctica, is an abundant zooplankton along the Western Antarctic Peninsula (WAP) and prey for higher trophic organisms. Changes in the pteropod (pelagic snail) phenology (life history) have important implications for regional food web dynamics. Pteropod shell lengths were collected from the PAL LTER sediment trap located along the northern continental shelf of the PAL LTER sampling grid, 2004-2018. PAL LTER has deployed a time-series trap near 64.5° S, 66.0° W since late 1992. The trap is moored in 300 m depth and collects sinking particles at 170 m. Pteropod samples are stored in 21 sample collection bottles on the sediment trap that were prepared with a Milli-Q deionized water rinse and filled with 7.5 g NaCl l-1 solution and 2% borate-buffered formalin in filtered seawater (34 ppt), with a final salinity concentration of 41 ppt. L. h. antarctica shell lengths also collected during the PAL LTER 2018 January offshore cruise and for four months at Palmer Station, Anvers Island (November 2017 to February 2018). L. h. antarctica and all other macrozooplankton collection on the PAL LTER cruise are performed with a 2 m square frame Metro net (700 µm mesh), towed obliquely to a depth of 120 m. At Palmer Station, pteropods are collected with a 1 m x 1 m square frame Metro net (700 µm mesh) and a 1 m diameter ring net (200 or 500 µm mesh), towed obliquely to a depth of ~50 m. Shell lengths are determined by measuring from the opening of the shell aperture directly across the diameter of the shell. The shell lengths analyzed within the WAP region are used to determine phenology patterns in pteropod population dynamics and changes thereof over time.
Figure 7 in Seasonal changes in the population structure of dominant planktonic copepods collected using a sediment trap moored in the western Arctic Ocean
Figure 7. Seasonal changes in the flux of adult females, lipid accumulation (upper panels) and gonad maturation (lower panels) composition (stage I−III) of C6F (a, d) Calanus hyperboreus; (b, e) Metridia longa; and (c, f) Paraeuchaeta glacialis.
Figure 4 in Seasonal changes in the population structure of dominant planktonic copepods collected using a sediment trap moored in the western Arctic Ocean
Figure 4. Seasonal changes in the copepod flux and species composition at St. NAPt from October 2010 to September 2012.
Figure 6 in Seasonal changes in the population structure of dominant planktonic copepods collected using a sediment trap moored in the western Arctic Ocean
Figure 6. Seasonal changes in the flux and copepodid stage composition of the four large calanoid copepods: (a) Calanus hyperboreus; (b) Metridia longa; (c) Paraeuchaeta glacialis; and (d) Heterorhabdus norvegicus.
Figure 2 in Seasonal changes in the population structure of dominant planktonic copepods collected using a sediment trap moored in the western Arctic Ocean
Figure 2. Seasonal changes in depth (a) and temperature (b) of the sediment trap at St. NAPt from October 2010 to September 2012. The current velocity at 188 and 275 m at St. NAPt (c) was estimated by a physical ocean general circulation model.
Figure 1 in Seasonal changes in the population structure of dominant planktonic copepods collected using a sediment trap moored in the western Arctic Ocean
Figure 1. The location of St. NAPt (Northwind Abyssal Plain) in the western Arctic Ocean where the sediment trap was moored at a depth of approximately 184–260 m from October 2010 to September 2012.
Figure 5 in Seasonal changes in the population structure of dominant planktonic copepods collected using a sediment trap moored in the western Arctic Ocean
Figure 5. (a) Seasonal changes in the flux and copepodid stage composition of the dominant copepod Oncaea parila (Poecilostomatoida). *C6F with egg sacs occurred. (b) The relationship between O. parila flux and the total mass flux. A positive relationship was detected in 2010–2011 (first year).
Sediment trap Rhizaria flux from sediment trap samples collected aboard CCE LTER process cruises in the California Current system, 2011 - present.
The collection and enumeration of sinking rhizarian cells on CCE LTER Process cruises has been led by Mike Stukel since 2007. Sinking particles are collected in VERTEX-style particle interceptor traps (PIT) with an 8:1 aspect ratio, 70-mm diameter, and a baffle on top comprised of 13 smaller beveled tubes with a similar 8:1 aspect ratio. Typically 8-12 tubes were deployed with a formalin-brine for a duration of 2-5 days. After recovery, samples were immediately gravity filtered through a 47-mm, 200-μm mesh nitex filter and analyzed under a stereomicroscope. The two dominant taxa of giant rhizaria (Aulosphaeridae and Castanellidae) were then enumerated in each sample. We note, however, that at least two distinct morphotypes of Aulosphaeridae were seen in the sample (but analyzed together because they had similar size and shape) and several smaller rhizarian taxa were also noticed, but not quantified because they are likely not quantitatively captured by our 200-μm filter. Mean and standard deviation of samples from different tubes are reported for each depth. For more details please see Stukel et al. (2013) or Biard et al. (submitted). Biard, T., J. W. Krause, M. R. Stukel and M. D. Ohman (submitted). "The significance of giant Phaeodarians (Rhizaria) to biogenic silica export in the California Current Ecosystem." Global Biogeochem. Cycles. Knauer, G. A., J. H. Martin and K. W. Bruland (1979). "Fluxes of particulate carbon, nitrogen, and phosphorus in the upper water column of the Northeast Pacific." Deep-Sea Research 26(1): 97-108. Stukel, M. R., M. D. Ohman, C. R. Benitez-Nelson and M. R. Landry (2013). "Contributions of mesozooplankton to vertical carbon export in a coastal upwelling system." Marine Ecology Progress Series 491: 47-65
Carbon:234Thorium ratios of sinking particles collected by sediment trap and large particles collected by in situ pump on CCE-LTER Process Cruises. 2006 - 2017 (ongoing).
The ratio of carbon to 234Thorium on particles can be used to convert water column 234Th measurements to sinking carbon flux estimates and to investigate particle scavenging in the ocean. Carbon:234Th ratios of two types of particles are measured: true sinking particles collected by sediment trap and large (>50-µm) particles collected using a McLane in situ Pump. Sinking particles are collected in VERTEX-style particle interceptor traps (PIT) with an 8:1 aspect ratio, 70-mm diameter, and a baffle on top comprised of 13 smaller beveled tubes with a similar 8:1 aspect ratio. Tubes are deployed with a formalin-brine for a duration of 2-5 days. After recovery, samples were gravity filtered through a 200-µm filter. The 200-µm filtered was then immediately examined under a stereomicroscope and mesozooplankton swimmers were removed from the sample. On P0704, P0810, and P1106 cruises the remaining (non-swimmer) portion of the material on the >200-µm filter was then re-combined with the <200-µm portion of the sample. Samples were then filtered through a pre-combusted quartz (QMA) filter. On P1208, P1604, and P1706 cruises the >200-µm and <200-µm fractions were filtered separately onto QMA filters to determine C:234Th ratios of different size classes of sinking particles. Typically, triplicate whole PIT tubes were filtered for C:234Th ratios. However, on some cycles with very high flux, samples were first split on a Folsom splitter. On some cycles, the mesozooplankton ‘swimmers’ were saved and filtered onto a separate QMA filter to quantify the C:234Th ratio of mesozooplankton. QMA filters were all dried and mounted in RISO sample holders. >50-µm particles were also collected using McLane in situ pumps (typically deployed for a period of ~1 hour at the same depth of the sediment traps). In situ pump samples were rinsed off of the 147-mm nitex mesh filters used with the pump onto a pre-combusted QMA filter, which was similarly dried and mounted in a RISO sample holder. Samples
Sediment trap in nearshore waters collected during Palmer LTER station season at Palmer Station Antarctica, 1992 - 1995.
Particulate organic matter is exported from the upper ocean euphotic zone in the form of large sinking particles and as dissolved material. Particle fluxes to depth link the surface and mesopelagic realm and supply food to the benthos. Sedimentation flux is typically measured with sediment traps of various designs. Sedimentation at the PAL site of the West Antarctic Peninsula demonstrates extreme seasonality, with a well-defined pulse in the Austral summer following sea ice retreat.
Bermuda Atlantic Time-Series Study (BATS) Sediment Trap - Flux
<p>This dataset is published on Zenodo by the Simons CMAP curators for long-term care. All credits go to the data producers at the Bermuda Atlantic Time-series Study (BATS): https://bats.bios.asu.edu/bats-data/ </p><p>The BATS (Bermuda Atlantic Time-series Study) sediment trap - flux dataset is time-series spanning from 1988 to 2022. The dataset contains multiple nutrient flux measurements.</p><p>This dataset description has been reproduced using: https://www.dropbox.com/sh/3jl8pq7fvy7iejl/AAC8c91nuNa5aanxLtNxau2aa?dl=0&preview=bats_flux_v002.txt</p>
Optical Sediment Trap Calibration on the New England coast
Measurements from the Opt_Sed_Trap_Cal (Optical Sediment Trap Calibration) project off the New England coast.
Observed fluxes of POC, PIC and bSi at EqPac, HAUSGARTEN, OSP, PAP-SO and BATS/OFP from sediment traps and radioisotopes on depth profiles
<p>This dataset contains a compilation of observed fluxes of sinking particulate material (particulate organic carbon or POC, particulate inorganic carbon or PIC, and biogenic silica or bSi) at five ocean time-series sites obtained from sediment traps and radioisotopes. The five time-series sites were selected upon abundance of data on a monthly and depth basis. The sites are:</p> <ol> <li>Equatorial Pacific Process Studi (EqPac) in the upwelling region of the equatorial Pacific</li> <li>Long-Term Ecological Research observatory HAUSGARTEN, in the eastern Fram Strait, off Svalbard, at the Atlantic-Arctic boundary.</li> <li>Ocean Station Papa (OSP), in the southern portion of the Alaska Gyre in the NE subarctic Pacific</li> <li>Porcupine Abyssal Plain time-Series Observatory (PAP-SO), in the NE Atlantic off the SW of the UK</li> <li>Bermuda Atlantic Time-Series/Oceanic Flux Program joint site (BATS/OFP), in the northern Sargasso Sea, in the subtropical NW Atlantic </li> </ol> <p>The compilation contains a total of 7013 data points, where BATS/OFP accumulates 50% of all of them, followed by OSP (28%), HAUSGARTEN (10%), PAP-SO (10%) and EqPac (2%). The bulk of the collected data is in the euphotic zone and POC flux has a higher count than PIC and bSi. The origin of the 98% of the data is sediment traps, the remaining 2% (157 data points) are surface fluxes derived from radioisotopes.</p>
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