Filter Results
384683 results
Abstract: Not Available Category: geoscientificInformation Source: Not Available Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: 36.805000 * LONGITUDE: -7.718000 * ELEVATION: -558.0 m * CAMPAIGN: Exp339 * BASIS: Joides Resolution * METHOD/DEVICE: Composite Core
Data Types:
  • Tabular Data
Abstract: Not Available Category: geoscientificInformation Source: Not Available Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: 44.030556 * LONGITUDE: 10.297222 * METHOD/DEVICE: Speleothem sample
Data Types:
  • Tabular Data
Abstract: This study aims to develop more accurate method for mapping closed canopy evergreen natural forest (CCEF) of the Eastern Arc Mountains (EAM) ecoregion in Tanzania and Kenya, to update the knowledge on its spatial extent, level of fragmentation and conservation status. We tested 1023 model possibilities stemming from combination of Sentinel-1(S1) and Sentinel-2(S2) satellite imagery, spatial texture of S1 and S2, seasonality derived from Landsat-8 time series and topographic information, using random forest modelling approach. The CCEF model has moderate accuracy measured in True Skill Statistic (0.57), and it clearly outperforms other similar products from the region. Based on this model, there are about 296000 ha of Eastern Arc Forests (EAF) left, which is 16-27% less than estimated by previous products. Furthermore, acknowledging small forest fragments (1-10 ha) implies that the EAFs are more fragmented than previously considered. The generated CCEF model should be used to design updates and more informed and detailed conservation allocation plans, to balance this situation Category: geoscientificInformation Source: Not Available Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE START: -6.000000 * LONGITUDE START: 36.000000 * LATITUDE END: -10.000000 * LONGITUDE END: 34.000000 * METHOD/DEVICE: Multiple investigations
Data Types:
  • Other
Abstract: Molecular biomarker data from two sets of compounds used as paleo sea surface temperature proxies - long-chain alkenones from haptophytes and isoprenoidal tetraethers from planktonic archaea were measured with the extraction-free approach of MALDI FT-ICR-MS in annually varved sediments from the Santa Barbara Basin deposited from AD 1984 - 2009. Category: geoscientificInformation Source: Not Available Supplemental Information: Not Availble Coverage: Not Available
Data Types:
  • Other
Abstract: Data acquisition was performed using the multibeam echosounder Kongsberg EM122. Raw data are delivered in Kongsberg .wcd format. The data acquisition was part of the international project JPI Oceans - MiningImpact Environmental Impacts and Risks of Deep-Sea Mining. Category: geoscientificInformation Source: Not Available Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE START: 19.050000 * LONGITUDE START: -104.330000 * LATITUDE END: 19.050000 * LONGITUDE END: -104.330000 * DATE/TIME START: 2019-02-24T00:00:00 * DATE/TIME END: 2019-03-27T00:00:00 * LOCATION: Clarion-Clipperton Fraction Zone, North East Pacific Ocean * CAMPAIGN: SO268/1 * BASIS: Sonne_2 * METHOD/DEVICE: Underway cruise track measurements EVENT LABEL: * LATITUDE START: 19.050000 * LONGITUDE START: -104.330000 * LATITUDE END: 49.280000 * LONGITUDE END: -123.120000 * DATE/TIME START: 2019-03-30T00:00:00 * DATE/TIME END: 2019-05-27T00:00:00 * LOCATION: Clarion-Clipperton Fraction Zone, North East Pacific Ocean * CAMPAIGN: SO268/2 * BASIS: Sonne_2 * METHOD/DEVICE: Underway cruise track measurements
Data Types:
  • Tabular Data
Abstract: Not Available Category: geoscientificInformation Source: Not Available Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: 36.805000 * LONGITUDE: -7.718000 * ELEVATION: -558.0 m * CAMPAIGN: Exp339 * BASIS: Joides Resolution * METHOD/DEVICE: Composite Core
Data Types:
  • Tabular Data
Abstract: Not Available Category: geoscientificInformation Source: Not Available Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: 44.030556 * LONGITUDE: 10.297222 * METHOD/DEVICE: Speleothem sample
Data Types:
  • Tabular Data
Abstract: The Western Antarctic Peninsula (WAP) has experienced rapid atmospheric and ocean warming over the past few decades and many marine-terminating glaciers have considerably retreated. Glacial retreat is accompanied by fresh meltwater intrusion, which may result in the freshening and acidification of coastal waters. Marian Cove (MC), on King George Island in the WAP, undergoes one of the highest rates of glacial retreat. Intertidal and shallow subtidal waters are likely more susceptible to these processes, and sensitive biological responses are expected from the organisms inhabiting this area. The gammarid amphipod Gondogeneia antarctica is one of the most abundant species in the shallow, nearshore Antarctic waters, and it occupies an essential ecological niche in the coastal marine WAP ecosystem. In this study, we tested the sensitivity of G. antarctica to lowered salinity and pH by meltwater intrusion following glacial retreat. We exposed G. antarctica to four different treatments combining two salinities (34 and 27 psμ) and pH (8.0 and 7.6) levels for 26 days. Mortality, excluding cannibalized individuals, increased under low pH but decreased under low salinity conditions. Meanwhile, low salinity increased cannibalism, whereas low pH reduced food detection. Shelter use during the daytime decreased under each low salinity and pH condition, indicating that the two stressors act as disruptors of amphipod behavior. Under low salinity conditions, swimming increased during the daytime but decreased at night. Although interactions between low salinity and low pH were not observed during the experiment, the results suggest that each stressor, likely induced by glacial melting, causes altered behaviors in amphipods. These environmental factors may threaten population persistence in Marian Cove and possibly other similar glacial embayments. Category: geoscientificInformation Source: Not Available Supplemental Information: In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2019) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI). The date of carbonate chemistry calculation by seacarb is 2020-03-18. Coverage: EVENT LABEL: * LATITUDE: -62.220000 * LONGITUDE: -58.790000 * DATE/TIME START: 2018-01-07T00:00:00 * DATE/TIME END: 2018-01-08T00:00:00 * METHOD/DEVICE: Experiment
Data Types:
  • Tabular Data
Abstract: Not Available Category: geoscientificInformation Source: Not Available Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: 41.000000 * LONGITUDE: 26.000000 * LOCATION: Greece * METHOD/DEVICE: Multiple investigations
Data Types:
  • Tabular Data
Abstract: Knowledge of the equatorial thermocline is essential for understanding climate changes in the tropical Pacific. Multispecies planktic foraminiferal analyses provide a way to examine temperature distributions and thus the structure of the thermocline. Although the secular thermocline development has been documented back to the late Miocene, the early to middle Miocene interval has rarely been examined. In addition, relationships with the dynamic Antarctic ice sheets remain unclear. Here we investigate the vertical thermal gradient in the upper water column at Integrated Ocean Drilling Program Site U1337 in the eastern equatorial Pacific (EEP) throughout the early to middle Miocene (23.1 to 11.7 Ma). The gradient increased over the Miocene Climatic Optimum, whereas it decreased during the East Antarctic Ice Sheet Expansion (EAIE). Comparison of the EEP record with its western equatorial Pacific (WEP) counterpart suggests that sea surface temperature was more stable in the WEP than in the EEP. We further estimated equatorial thermocline from two diagonal gradients between the EEP and the WEP: thermocline shoaled from 16.7 to 15.7 Ma and tilt weakened between 16.5 and 13.8 Ma. The onset of the "Monterey Excursion" and the reduced Antarctic ice sheet volume would have affected thermocline depth and tilt, respectively. Thermocline depth was likely much deeper compared to Pliocene‐to‐modern conditions. Furthermore, a 4‐point‐based distribution of isotherms (4DI index) was used as a metric of the evenness or unevenness of the isotherm distributions. The 4DI index considerably reduced at around the EAIE and other Mi‐events, reflecting the evenly distributed isotherms under a more glaciated Antarctica. Category: geoscientificInformation Source: Not Available Supplemental Information: (1) = Analytical precisions are ±0.10‰ for δ¹⁸O and ±0.04‰ for δ¹³C, whereas blank indicates those are ±0.05‰ forδ¹⁸O and ±0.03‰ for δ¹³C. Coverage: EVENT LABEL: * LATITUDE: 3.833445 * LONGITUDE: -123.206035 * ELEVATION: -4472.0 m * Recovery: 420.11 m * CAMPAIGN: Exp321 * BASIS: Joides Resolution * METHOD/DEVICE: Drilling/drill rig
Data Types:
  • Tabular Data