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78 results for “CCE”
Dry weight biomass measurements of net-collected mesozooplankton. Samples collected in the CCE-LTER region on Process Cruises from 2006 to the present. Summaries for each Lagrangian Cycle.
Mesozooplankton are collected with plankton nets (typically a 71-cm diameter, 202-um mesh Bongo net) and samples flash frozen at sea in liquid N2 for subsequent shore-based measurements of dry weight biomass. Measurements are made by weighing pre-tared Nitex mesh on an analytical balance, for mesozooplankton size-fractionated into 5 different categories (> 0.2 mm, 0.5 mm, 1.0 mm, 2.0 mm, 5.0 mm). Biomass is expressed as dry mass of zooplankton per m3 of water filtered, or when multiplied by the maximum depth of the tow, as integrated dry mass of zooplankton per m2 of sea surface. Samples for dry weight biomass have been collected on CCE-LTER Process Cruises since 2006 and these collections are ongoing.
Particulate organic carbon and nitrogen measurements at selected depths in the water column from CalCOFI-CCE Augmented cruises in the California Current System, 2004 - November 2022
Water column bottle samples at multiple depths are taken during CalCOFI cruises (since 2004, ongoing) at various CTD stations, filtered, and stored at -20°C. Measurements of particulate organic carbon (POC) and nitrogen (PON) are performed onshore in the lab where samples are acidified, dried and analyzed by high-temperature combustion. The sample and tin capsule react with oxygen and combust at 1000°C, and the sample is broken down, thus converting organic carbon to CO2 and reducing nitrogen oxides to N2 gas. Both gases are measured by thermal conductivity. Samples analyzed within the CCE constrain the mean C:N ratio of small particulates and by difference relative to measured living biomass, the biomass of suspended detritus.
Exported particulate carbon and nitrogen measurements from 4-day sediment trap deployments in the CCE region, 2007 - 2019 (ongoing).
Sediment traps are used to measure particulate export flux of organic matter from the euphotic zone at various depths (up to 100), so to better understand what flows through the water column regarding food chains in the CCE. Tubes are filled with dense seawater to create a density gradient, and are attached to a wire connected to a drifting float for up to 4 days. Samples from the recovered array of the trap material (fecal matter and other sinking particles - zooplankton removed) are filtered onto precombusted filters for analyses of particulate carbon and nitrogen flux rates for each cycle in the CCE Process cruises (since 2007, ongoing)
Primary production estimates from 14C uptake (in situ), determined by the incorporation of inorganic carbon into particulate organic carbon (POC) due to photosynthesis at selected light levels from CCE LTER process cruises in the California Current System, 2006 - 2021 (ongoing).
Primary productivity samples of seawater are taken each day shortly before noon on the CTD rosette up-cast during the CCE Process crusies (since 2006, ongoing). Light penetration below the surface is estimated from the Secchi disk depth. Niskin bottles from depths with ambient light intensities corresponding to light levels simulated by on-deck incubators are identified and sampled. Primary production is estimated from 14C uptake using this simulated in situ technique (followed by filtering) by which the assimilation of dissolved inorganic carbon by phytoplankton yields a measure (in µg/L/day) of the rate of photosynthetic primary production (particulate organic carbon, POC) at selected light levels in the euphotic zone within the CCE study area.
Assembled file of one minute averages for high resolution surface meteorological (Met) and sea water intake (SWI) data from continuous underway measurements from CCE LTER process cruises in the CCE region, 2006 - 2019.
As the research vessel is underway for the duration of a CCE Process Cruise (since 2006, ongoing), 30 parameters are continuously measured regarding the oceanographic surface and atmospheric and navigational environment of the vessel, along the ship's trackline in the CCE region.
High Performance Liquid Chromatography (HPLC) pigment analysis from rosette bottle samples at various depths from CalCOFI-CCE Augmented cruises in the California Current System, 2002 to 2023 (ongoing).
High Performance Liquid Chromatography (HPLC) samples are collected from rosette bottles (from three to eight different depths in the photic zone) at stations located within the CCE region on CalCOFI cruises (since 2002, ongoing). The HPLC method is used to measure concentrations of chlorophylls and carotenoids in samples of particulate matter, which includes filtering and freezing the filter while at sea. The taxon-specific phyto-pigments are extracted back onshore. Concentrations of chlorophyll a are used as a proxy for phytoplankton biomass and concentrations of other taxon-specific pigments are used to determine contributions of phytoplankton taxa to total phytoplankton biomass.
The co-occurrence of MHW characteristics and in situ sampling from CCE-CalCOFI Augmented Cruises in the California Current System,1983~2021
The intensity and duration of each MHW event and the anomalies of in situ nitracline and plankton abundance in the Southern California Current System (the region south of line 76.7; 29-36°N, 117-125°W) were calculated. In situ data are available from ~quarterly CalCOFI cruises. Data collected from 1983 onward were utilized, including nitrate, picoplankton and bacteria abundance, size-fractionated Chla concentration, vertically-integrated Chla, vertically-integrated primary production, phytoplankton taxon-specific pigments from High-Performance Liquid-Chromatography (HPLC) analysis, zooplankton displacement volume (ZDV), zooplankton taxon-specific abundance, and fish egg and larvae abundance.
Measurements, from CCE LTER process cruises in the California Current region, of total dissolvable inorganic concentrations of the nutrient iron, 2017 - (ongoing).
Seawater profiles or discrete samples for total dissolvable iron (TDFe) analysis are collected with the trace metal rosette or GO-FLO bottles, respectively, in stations located within the CCE LTER region in the California Current System. The total dissolvable iron concentration is obtained by collecting unfiltered seawater samples in 250 mL LDPE bottles and storing them at pH 1.8 for 6 months or more. The acidified seawater sample is then filtered using acid cleaned 0.4 um PES membrane Titan 3 syringe filters and determined by flow injection chemiluminescent (FI-CL) analysis at Scripps Insitution of Oceanography since 2017 (ongoing).
Conductivity Temperature Depth (CTD) Log of CTD casts from CCE LTER process cruises in the CCE region, 2006 - 2019 (ongoing).
Individual casts of Conductivity, Temperature and Depth (CTD) are logged on CCE Process cruises (since 2006, ongoing) in the Southern California region. The log includes time, location, number of bottles, cast and event numbers and other information about CTD casts.
CCE fronts
<p>Code and data supporting the article "Sub-frontal niches of plankton communities driven by transport and trophic interactions at ocean fronts" (Inès Mangolte, Marina Lévy, Clément Haeck & Mark Ohman) submitted to Biogeosciences (EGUsphere) in march 2023.</p>
Colon Capsule Endoscopy (CCE) Versus Computed Tomographic Colonography (CTC) in the Identification of Colonic Polyps in a Screening Population.
ClinicalTrials.gov study NCT02754661. IPD Sharing: NO. Countries: 1. Publications: 1.
Phytoplankton growth and microzooplankton grazing rates from CCE LTER Process cruises in the California Current System, 2006 - 2017.
Rates of phytoplankton community growth and microzooplankton grazing on phytoplankton were assessed from chlorophyll a analyses of in situ dilution incubations as described in Landry et al. (2009). For each experiment (Array #), seawater was collected from predawn CTD (~2 a.m. local time) casts at 6-8 depths spanning the upper to lower euphotic zone. For each depth, we prepared a pair of polycarbonate bottles (2.7 L), one with whole seawater (100%), and one with 33% whole seawater (diluted with 0.1-µm filtered seawater) at each depth. Seawater was filtered directly from the Niskin bottles using a peristaltic pump, silicone tubing and an in-line Suporcap filter capsule that had previously been acid washed (10% trace-metal grade HCl followed by Milli-Q and seawater rinses). Dilution treatment bottles received pre-measured volumes of filtered water from the collection depths, and then were gently filled (silicone tubing below the water level) with unscreened water from the Niskin bottles. The filled bottles were tightly capped, placed into net bags and clipped onto attached rings at the depth of collection on a tether line attached to a satellite-tracked surface drifter (WOCE SVP) with a top strobe light, Globalstar telemetry and a 3-m holey-sock drogue centered at 15-m (mixed layer). Incubations were done in situ for 24-h (daily) to get daily averaged rates. In most cases, repeated experiments/deployments were done over the course of 2-5 days, using water collected each morning at the location of the drifter. These back-to-back experiments define experimental “cycles”. The second set of experiments were set up, before recovering the first. Hand recovery of the array, switching of net bags and redeployment was generally completed in 15-20 min. Rate estimates are based on initial and final subsamples (250 ml) taken for fluorometric analyses of Chl a. The samples were immediately filtered onto GF/F filters, and the Chl a extracted with 90% acetone in a dark refrigerator
Colonic Capsule Endoscopy (CCE) for Screening of Neoplasm's A Pilot Study
ClinicalTrials.gov study NCT02303756. IPD Sharing: Not stated. Countries: 1. Publications: 3.
SECOND GENERATION COLON CAPSULE ENDOSCOPY (CCE-2) IN PEDIATRIC CROHN'S DISEASE (CD).
ClinicalTrials.gov study NCT02199626. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Human vs Machine: a RCT Comparing Traditional In-person Instruction, AI Versus VR for Learning Basic CCE
ClinicalTrials.gov study NCT06355557. IPD Sharing: NO. Countries: 1. Publications: 1.
Size fractionation for total Chl a within the surface layer and calculated size distribution of total Chl a from discrete bottle samples from CCE-CalCOFI Augmented Cruises in the California Current System, 2004 - 2017 (ongoing).
Water for size fractionation of chlorophyll a is sampled from ~10m depth (surface layer) on Line 83 and 87, with scattered inshore stations within the CalCOFI and SCCOOS stations located in the CCE study area. The size distribution of total chlorophyll a is determined by filtering water though filters of differing pore sizes. These are then extracted in acetone and analyzed fluorometrically with Turner Designs 10-AU Fluorometer on CalCOFI cruises (since 2006, ongoing). Chlorophyll a and taxon-specific pigments (chlorophylls and carotenoids) are qualitatively and quantitatively characterized in the lab onshore by several size fractions (< 1µm to > 20µm) utilizing High Performance Liquid Chromatography (HPLC) analysis. The samples analyzed within the CCE region are used to develop a metric for phytoplankton community structure that can be used to monitor its state and changes thereof over time.
Daily weather summaries (temperature, precipitation and wind) for station SAN DIEGO LINDBERGH FIELD, CA US (GHCND:USW00023188), obtained from NOAA National Climatic Data Center and re-published through CCE LTER data system for community use as regionally relevant data, 1939 - Oct 2019.
Data provided here are obtained from the Global Historical Climatology Network - Daily (GHCN-Daily) database, provided by NOAA National Centers for Environmental Information (formerly NCDC). Data are periodically downloaded by CCE LTER Information Management and imported into the local data system for use by the local scientific community as regionally relevant data. The data contained in this dataset are from the SAN DIEGO LINDBERGH FIELD, CA US station (GHCND:USW00023188) at 32.7336°, -117.1831° beginning in July 1, 1939. The Global Historical Climatology Network - Daily (GHCN-Daily) dataset integrates daily climate observations from approximately 30 different data sources. Version 3 was released in September 2012 with the addition of data from two additional station networks. Changes to the processing system associated with the version 3 release also allowed for updates to occur 7 days a week rather than only on most weekdays. Version 3 contains station-based measurements from well over 90,000 land-based stations worldwide, about two thirds of which are for precipitation measurement only. Other meteorological elements include, but are not limited to, daily maximum and minimum temperature, temperature at the time of observation, snowfall and snow depth. Over 25,000 stations are regularly updated with observations from within roughly the last month. The dataset is also routinely reconstructed (usually every week) from its roughly 30 data sources to ensure that GHCN-Daily is generally in sync with its growing list of constituent sources. During this process, quality assurance checks are applied to the full dataset. Where possible, GHCN-Daily station data are also updated daily from a variety of data streams. Station values for each daily update also undergo a suite of quality checks.
Cell counts (per liter) by size groups of diatoms, autotrophic and heterotrophic plankton, via epifluorescent microscopy (EPI) from CCE LTER process cruises in the California Current region, 2006 - 2016.
Microbial community assemblages of the California Current Ecosystem (CCE) are assessed for abundance of diatoms, autotrophic (dinoflagellate and other eukaryotes) and heterotrophic (dinoflagellate and other eukaryotes) plankton using high-throughput digital epifluorescence microscopy (EPI). Samples to estimate the nano- and microplankton (0.2-2.0-µm and 2.0-20-µm size, respectively) are collected at various depths, preserved, stained, and filtered onto a membrane filter and mounted on a glass microscope slide aboard the process cruises (since 2006, ongoing). Slides are then frozen at -80°C for subsequent imaging and analysis in the laboratory onshore.
Size group (pico, nano, micro) and group total carbon estimates from cell counts via epifluorescent microscopy (EPI) of heterotrophic and autotrophic plankton from CCE LTER process cruises in the California Current region, 2006 - 2016
Microbial community assemblages of the California Current Ecosystem (CCE) are assessed for biomass of heterotrophic (dinoflagellate and other eukaryotes) and autotrophic (dinoflagellate and other eukaryotes) plankton using high-throughput digital epifluorescence microscopy (EPI). Samples to estimate the nano- and microplankton (0.2-2.0-µm and 2.0-20-µm size, respectively) are collected at various depths, preserved, stained, and filtered onto a membrane filter and mounted on a glass microscope slide aboard the process cruises (since 2006, ongoing). Slides are then frozen at -80°C for subsequent imaging and analysis in the laboratory onshore. Carbon biomass is computed from cell biovolumes.
Total Thorium-234 (Th-234) taken from discrete water column samples collected during CCE Process Cruises (2006 - 2017).
Thorium-234 (Th-234) is the first long-lived (half-life = 24.1 days) daughter particle of Uranium-238 (U-238). While U-238 is conserved in the ocean (it covaries with salinity and has a half-life of 4.5 billion years), Th-234 is scavenged onto particles and hence removed from the surface ocean when those particles sink to depth. By measuring vertical profiles of total Th-234 activity in the euphotic zone and assuming steady-state between production of Th-234 from U-238 decay and removal of Th-234 on sinking particles, we can thus estimate the export of Th-234 from sampled water parcels. These measurements of Th-234 export can be converted to estimates of carbon export by multiplying by the C:Th-234 ratio of sinking particles measured at the same time and location.
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