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Processed sensible and latent heat flux from a eddy-covariance systems (IRGASON) for summer 2019 at the EastGRIP
No full textProcessed 10-minute surface sensible and latent heat flux measured at 215 cm above snow surface. The three eddy-covariance systems are a Campbell Scientific CSAT3 and a Krypton Hygrometer KH20, a Campbell Scientific IRGASON and a Campbell Scientific CSAT3 and a Li-COR Li-7500. The eddy-covariance systems were set up approximately 6m apart and directed into the mean wind. The processing software was TK3 from the University of Bayreuth. The timestamps indicate the middle of the 10-minute averaging period. Average variables, (co)variances, friction velocity and Monin-Obukhov stability parameter estimates are provided for convenience
Processed sensible and latent heat flux from a gas analyzer (Li-COR) for summer 2019 at the EastGRIP
No full textProcessed 10-minute surface sensible and latent heat flux measured at 215 cm above snow surface. The three eddy-covariance systems are a Campbell Scientific CSAT3 and a Krypton Hygrometer KH20, a Campbell Scientific IRGASON and a Campbell Scientific CSAT3 and a Li-COR Li-7500. The eddy-covariance systems were set up approximately 6m apart and directed into the mean wind. The processing software was TK3 from the University of Bayreuth. The timestamps indicate the middle of the 10-minute averaging period. Average variables, (co)variances, friction velocity and Monin-Obukhov stability parameter estimates are provided for convenience
Low resolution Mg/Ca on planktonic foraminiferal calcite from MD96-2048 (Pleistocene) - T. sacculifer
No full textThis study was conducted to evaluate discrepancies between SST proxies and to assess their sensitivity to oceanographic changes. These data contribute to improved proxy interpretation, particularly for paleoceanographic reconstructions in subtropical ocean settings. This dataset provides sea surface temperature (SST) reconstructions over the past 1.25 million years from sediment core MD96-2048, collected at 660 m water depth near Delagoa Bight in the southwestern Indian Ocean (26°10.482′S, 34°01.148′E) during the Marion Dufresne MD104 cruise. The dataset includes Mg/Ca ratios geochemical records from planktonic foraminifera, presented at low resolutions (10 datapoints). Mg/Ca analyses were conducted on Trilobatus sacculifer (new data presented here), and compared with Mg/Ca on Globigerinoides ruber (published by Caley et al., 2011; doi:10.5194/cp-7-1285-2011) using inductively coupled plasma optical emission spectrometry (ICP-OES). Clumped isotope measurements were performed on G. ruber and are available in the EarthChem dataset. The age model is based on benthic foraminiferal δ¹⁸O stratigraphy from the same core (Caley et al., 2011, doi:10.5194/cp-7-1285-2011). The dataset spans the Quaternary period, with temporal coverage from 0 to 1.25 million years before present. Sampling resolution for Mg/Ca of T. sacculifer is very low (10 datapoints over the last 1.25 Ma), allowing for investigation of differences between Mg/Ca and clumped isotopes.
SSTs were primarily calculated using the T. sacculifer Mg/Ca–temperature calibration from Anand et al. (2003, doi:10.1029/2002PA000846), applying the equation with the constant A assumed for this morphotype (with sac). To account for salinity-related biases in Mg/Ca, calibration adjustments based on Gray and Evans (2019, doi:10.1029/2018PA003517) were also incorporated. Data are provided as tabulated time series of raw geochemical measurements and calculated SST estimates
Water column profile data of oxygen, hydrogen sulfide, and nutrients from pump-CTD casts during RV SONNE cruise SO296/2
No full textThe water column was profiled for nutrients (nitrate, nitrite, phosphate, ammonium, silicate), gases (hydrogen sulfide, dihydrogen, oxygen), and pH during pump-CTD casts aboard the RV SONNE during cruise SO296/2. The expedition took place from January 21 to February 21, 2023, in the eastern Pacific Ocean, following a route from Talcahuano to San Vicente, Chile. Its primary aim was to investigate the transformation and degradation of organic matter, as well as the effects of water column anoxia on ecosystems, including habitat structure, food webs, and biodiversity. A key focus was also placed on the oceanographic context, particularly microturbulence. Additionally, the expedition examined how postglacial changes in atmospheric and oceanic circulation in the southeastern Pacific have influenced two contrasting fjord systems. The study further assessed the roles of eustatic sea-level rise, regional isostatic uplift, and glacier dynamics in shaping the development of these fjord environments. A pump-CTD (Strady et al., 2008) was deployed at four stations on the Chilean shelf off Concepción and at three stations in the Golfo Almirante Montt (Patagonia). Vertical profiles of temperature, salinity, turbidity, fluorescence, and conductivity were measured in situ using a Sea-Bird Electronics SBE 911plus (SN-0603) conductivity-temperature-depth (CTD) probe, a D&A OBS-3 turbidity sensor, and a WETStar fluorometer, all mounted on a Sea-Bird Electronics SBE 32 rosette. For gas, nutrient, and pH measurements, water was pumped from the CTD to the onboard laboratory via PTFE tubing. In the laboratory, the water flow was split into two continuous lines. One line was connected to an autoanalyzer for automated nutrient analysis (QuAAtro, SEAL Analytics). Prior to autoanalyzer measurements, the water passed through a syringe filter (Whatman GF-075, 0.3 μm pore size) integrated into the tubing. It was then analyzed following the protocols of Hansen & Koroleff (1999) . Measurement precision was 0.3 µM for silicate, 0.01 µM for phosphate, 0.02 µM for nitrate, 0.006 µM for nitrite, and 0.02 µM for ammonium. The other line was directed to a series of sensors integrated into flow-through cells: an optical pH and temperature sensor (PyroScience), several Unisense microelectrodes with different sensitivities for hydrogen sulfide (overall detection limit: 10 nM), a low-range Unisense dihydrogen microelectrode (detection limit: 0.3 µM), and two Unisense oxygen microelectrodes—one standard-range and one STOX (Switchable Trace OXygen) microelectrode for high-sensitivity oxygen detection (detection limit: 13 nM). Due to minimal oxygen contamination through the CTD tubing system, an overall detection limit of 79 nM for oxygen was achieved. All sensors were regularly recalibrated according to the manufacturers' instructions to ensure optimal measurement accuracy. Total sulfide concentrations were calculated from the measured pH, temperature, salinity, and hydrogen sulfide values
Temperature, salinity and pH in Changuu Island, Zanzibar Archipelago, Tanzania
No full textTemperature, salinity and pH of the water column and pore water during a nutrient enrichment and macrofauna exclusion experiment. A total of 24 plots were set up parallel to the shore, with presence of the three seagrass species (Syringodium isoetifolium, Thalassodendron ciliatum and Thalassia hemprichii) in each plot. The experiment was the factorial combination of two treatments: macrofauna exclusion using cages (three levels: open, closed and uncaged) and nutrient enrichment using garden NPK fertilizer (two levels: ambient and enriched). Each treatment combination was replicated four times. The macrofauna exclusion cages were made of wooden pegs (0.5 x 0.5m wide and 0.5 m high) and were covered with a plastic net (14 mm diagonal mesh size). This mesh-size excludes macrofauna, but not small fish and mesofauna. This macrofauna exclusion technique (Casini et al., 2008) simulates the consequences for the food web of losing a top predators and macrograzers. Open cages had all the side meshes halved to allow partial access from all four sides (to check for cage effects), and uncaged plots were marked with four wooden pegs. The cages were anchored by metal T bars and cleaned every 2 weeks to remove organisms and filamentous algae that would otherwise affect light penetration and water flow. Nutrient enrichment was simulated by issuing nitrogen-phosphorus-potassium (NPK) [15:9:20] fertilizer pellets. NPK fertilizer fast release pellets were packed into cotton tubes and then into a perforated plastic tubes to simulate slow release of nutrients. The tubes were filled with 75g of pellets and five tubes were placed in each of the enriched plots (375g in total per plot) following the protocol by Heck et al. (2000). The tubes were buried half-way into the sediment to ensure enrichment of both the water column and the sediment. Fertilizer was replaced every 3 weeks, making a total of 1125 grams of fertilizer released per enriched plot at the end of the experiment. All plots were separated by at least 3 metres, proven as a no-overspill area in previous nutrient enrichment experiments (Lotze & Worm, 2000).
Data was collected between July 19th and September 20th of 2017 in four sampling times. Day 0 (19.07.2017), Day 20 (09.08.2017), Day 38 (31.08.2017) and Day 63 (19.09.2017).
Data collection and experiment took place in Changuu Island (Zanzibar Archipelago, Tanzania; 06˚11'S, 39˚16'E). Changu Island is located 3 km from Stone Town, Zanzibar's busiest town. Changuu remains relatively unaffected by nutrient runoff pollution, although it has a small tourist resort and a large tortoise centre with daily boat traffic bringing tourists from Stone town. The study area is characterised by a fringing reef around a multi-specific seagrass ecosystem. The substrate is primarily carbonate sediment. Average water depth is approximately 30 cm at Spring Low and 5 m at Spring high tide with an average depth of 2 m.
General environmental parameters were collected at each sampling time for accounting for potential confounding variables during the experiment.
A Multiprobe 3430 (WTW GmbH) was utilized to measure temperature (TetraCon 925, ̊C), salinity (TetraCon 925, psu) and pH (SenTix 950). Measurements were taken in the morning approximately every two hours at each sampling time
Foraminifera density analyses of sediment core ML1208-16BB from central equatorial Pacific
No full textConstraints on deep ocean carbonate chemistry are critical for understanding the processes responsible for glacial-interglacial changes in atmospheric pCO2 and the ocean feedbacks that amplify carbon cycle change. Here, we present the results of foraminifera density analyses (mass per feret diameter) as measured on the planktonic foraminifera G. ruber. These data are inconsistent with a co-registered B/Ca-based record of carbonate ion concentration (∆[CO32-]) suggesting a decoupling of bottom water and porewater carbonate chemistry
Soil- moisture and temperature from the PhytOakmeter plot FBOL_14 (Toulenne, France) from 2019
No full textAs part of PhytOakmeter (www.phytoakmeter.de), time-domain transmission, soil moisture and -temperature sensors with custom-made logger systems were used to measure time series of soil state variables. The aim of these investigations was to provide data on environmental properties used in a cross-disciplinary approach.
The measurement device consisted of two sensors at three different depths. The dataset contains the values of time (UTC), relative permittivity, soil moisture (in % vol) derived from permittivity and soil temperature (in °C). Determination of soil moisture was done using the formula of Topp et al. (1980). As sensors, the SMT100 soil moisture sensors with integrated temperature measurement were used. All sensors were installed within the upper 50cm below ground. The exact depths for each sensor are listed in the dataset and parameter comment
Taxon classification for phylogenetic analysis of plant cover during experimental drought and restoration in a coastal prairie in Santa Cruz, CA, USA in 2021
No full textTaxonomic names and classifications derived from plant community data in 2021 formatted for extracting a phylogenetic tree using R