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Cellular trace elements collected on cruise RR1604 (GO-SHIP transect IO9N) in the Eastern Indian Ocean from March to April 2016
No full textDataset: Cellular Trace ElementsThis dataset includes measurements of cellular trace elements collected on cruise RR1604 (GO-SHIP transect IO9N) in the Eastern Indian Ocean from March to April 2016.
For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/768064NSF Division of Ocean Sciences (NSF OCE) OCE-155902
Ice viscosity is more sensitive to stress than commonly assumed
Full text link© The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Millstein, J. D., Minchew, B. M., & Pegler, S. S. Ice viscosity is more sensitive to stress than commonly assumed. Communications Earth & Environment, 3(1), (2022): 57, https://doi.org/10.1038/s43247-022-00385-x.Accurate representation of the viscous flow of ice is fundamental to understanding glacier dynamics and projecting sea-level rise. Ice viscosity is often described by a simple but largely untested and uncalibrated constitutive relation, Glen’s Flow Law, wherein the rate of deformation is proportional to stress raised to the power n. The value n = 3 is commonly prescribed in ice-flow models, though observations and experiments support a range of values across stresses and temperatures found on Earth. Here, we leverage recent remotely-sensed observations of Antarctic ice shelves to show that Glen’s Flow Law approximates the viscous flow of ice with n = 4.1 ± 0.4 in fast-flowing areas. The viscosity and flow rate of ice are therefore more sensitive to changes in stress than most ice-flow models allow. By calibrating the governing equation of ice deformation, our result is a pathway towards improving projections of future glacier change..D.M. was partially funded through an NSF Graduate Research Fellowship. J.D.M. and B.M.M. where partially funded through NSF-NERC award 1853918. B.M.M. received additional funding through NSF-NERC award 1739031
Effects of hotspot‐induced long‐wavelength mantle melting variations on magmatic segmentation at the Reykjanes Ridge: insights from 3D geodynamic modeling
Full text linkAuthor Posting. © American Geophysical Union, 20222. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Solid Earth 127(3), (2022): e2021JB023244, https://doi.org/10.1029/2021jb023244.Spatial variations in mantle melting induced by the Iceland hotspot have strong effects on meso-scale mantle upwelling and crustal production along the slow-spreading Reykjanes Ridge. The ridge-hotspot interaction has been recorded by diachronous V-shaped ridges and troughs extending away from Iceland, as well as by changes in ridge segmentation since 37 Ma. The origins of V-shaped structures are widely debated, while the causes of the gradual erasion of ridge segments bounded by transform faults are rarely investigated. Through 3D time-dependent geodynamic modeling, this study investigates how the hotspot-induced regional mantle melting variations affect ridge segmentation. Periodic temperature perturbations were initially imposed beneath the melting zone to trigger buoyant upwelling cells, which corresponded to the offset ridge segments at the Reykjanes Ridge. Iceland hotspot-induced long-wavelength mantle melting variations were generated by applying a regional linear temperature gradient at the bottom of the model domain. Modeling reveals a two-stage evolution of the buoyant upwelling cells that characterizes the segmentation transition at the Reykjanes Ridge. In Stage 1, the regional mantle melting variations trigger along-axis pressure-driven mantle flow, which alters the segment-scale mantle upwelling and promotes the propagation of segment boundaries away from the region with relatively higher mantle temperature. In Stage 2, buoyant upwelling cells are destroyed progressively as along-axis mantle flow dominants, leaving V-shaped diachronous boundaries between the segmented and unsegmented crust. These results advance our understanding of the effects of long-wavelength mantle melting variations induced by regional mantle heterogeneities on ridge segment evolution at slow-spreading ridges.This work was supported by Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) (GML2019ZD0205); the National Science Foundation of China (41890813, 41976066, 91858207, 41976064, and 91628301); the Chinese Academy of Sciences (Y4SL021001, QYZDY-SSW-DQC005, 133244KYSB20180029, 131551KYSB20200021 and ISEE2021PY03); the Guangdong Basic and Applied Basic Research Foundation (2021A1515012227); the National Key Research and Development Program of China (2018YFC0309800 and 2018YFC0310105), and the Hainan Provincial Natural Science Foundation of China (421QN381). We thank the Computational Infrastructure for Geodynamics (geodynamics.org) which is funded by the National Science Foundation (EAR-0949446 and EAR-1550901) for supporting the development of ASPECT (https://geodynamics.org/cig/software/aspect/). The numerical simulation is supported by the High-Performance Computing Division in the South China Sea Institute of Oceanology. Figures were drawn using the GMT software of Wessel and Smith (1998)
An integrative re-evaluation of Typhlatya shrimp within the karst aquifer of the Yucatan Peninsula, Mexico
Full text link© The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Ballou, L., Brankovits, D., Chavez-Solis, E. M., Diaz, J. M. C., Gonzalez, B. C., Rohret, S., Salinas, A., Liu, A., Simoes, N., Alvarez, F., Miglietta, M. P., Iliffe, T. M., & Borda, E. An integrative re-evaluation of Typhlatya shrimp within the karst aquifer of the Yucatan Peninsula, Mexico. Scientific Reports, 12(1), (2022): 5302, https://doi.org/10.1038/s41598-022-08779-9.The Yucatán Peninsula, Mexico is a carbonate platform well-known for extensive karst networks of densely stratified aquifer ecosystems. This aquifer supports diverse anchialine fauna, including species of the globally distributed anchialine shrimp genus Typhlatya (Atyidae). Four species (T. campecheae, T. pearsei, T. dzilamensis and T. mitchelli) are endemic to the Peninsula, of which three are federally listed in Mexico. This first integrative evaluation (i.e., molecular, morphological, broad geographic and type locality sampling, and environmental data) of Yucatán Typhlatya reveals considerable species identity conflict in prior phylogenetic assessments, broad species ranges, syntopy within cave systems and five genetic lineages (of which two are new to science). Despite sampling from the type locality of endangered T. campecheae, specimens (and molecular data) were indistinguishable from vulnerable T. pearsei. Ancestral/divergence reconstructions support convergent evolution of a low-salinity ancestor for a post-Paleogene arc Yucatán + Cuba Typhlatya clade within the anchialine Atyidae clade. A secondary adaptation for the coastal-restricted euryhaline (2–37 psu), Typhlatya dzilamensis (unknown conservation status) was identified, while remaining species lineages were low-salinity (< 5 psu) adapted and found within the meteoric lens of inland and coastal caves. This study demonstrates the need for integrative/interdisciplinary approaches when conducting biodiversity assessments in complex and poorly studied aquifers.Financial support for this study was provided by Texas A&M-CONACYT (TI, FA), TI, FA), PAPIIT IN208519 (DGAPA-UNAM) (FA), CONACYT Ciencia Básica A1-S-32846 (FA), Texas A&M University San Antonio (TAMUSA) Start-up Funds (EB), TAMUSA Research Council Grant (EB), TAMUSA Summer Faculty Grant and Fellowship (EB). NSF-REU/OCE: 1560242 supported AL and EB, and TAMU-Louis Stokes Alliance for Minority Participation (HRD: 1612776) supported SR, LS. This work was also supported by the NSF Graduate Research Fellowship Program (M1703014) and the Cave Conservancy Foundation (LB). Typhlatya sampling was sanctioned under collection permits SEMARNAT/SGPA/DGVS 05263/14, 004471/18, 05996/19
Temperature data from Onset HOBO U22 loggers deployed at various depths on instrument moorings inside and outside of kelp forests near the Monterey Peninsula, California, USA from June to August 2018 and 2019
No full textDataset: HOBO U22 water column temperature - Inside and outside kelpThese data are from Onset HOBO U22 data loggers recording at 1-minute intervals deployed at various depths on instrument moorings from June to August in 2018 and 2019. Moorings were located inside and outside of a kelp forests near the Monterey Peninsula, California, USA.
For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/864813NSF Division of Ocean Sciences (NSF OCE) OCE-1737096, NSF Division of Ocean Sciences (NSF OCE) OCE-173717
Predation intensity on marine invertebrate communities across latitude observed using underwater video (Competition and Predation across Latitude)
No full textDataset: Predation intensity on marine invertebrate communities across latitude observed using underwater videoPredation intensity recorded from exposed prey communities at coastal sites across a latitudinal gradient spanning the subarctic to the tropics. Invertebrate communities developed under low predation for three or 12 months within cages. Mature prey communities were then exposed to ambient predation, with a high definition camera recording all predation events during the diurnal period over three days of exposure. This experiment provided an assessment of predation intensity (and predator identity) to complement predator exclusion experiments that measured impact of predators on prey community assembly.
For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/863158NSF Division of Ocean Sciences (NSF OCE) OCE-143452
Initial Oxygen Concentration Alteration Experiment Data of the Deep Santa Barbara Basin Water Column from October 2019 (BASIN project)
No full textDataset: Initial Oxygen Concentration Alteration DataAn oxygen concentration alteration experiment was performed to test the influence of oxygen concentration on methane oxidation rate. Together with the methane concentration alteration experiment, the purpose of this experiment was to test the assumption that methane oxidation in the Santa Barbara Basin deep water column follows first order kinetics.
For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/872665NSF Division of Ocean Sciences (NSF OCE) OCE-1829981, NSF Division of Ocean Sciences (NSF OCE) OCE-183003
Chlorophyll-a concentrations from CTD cast deployments and underway seawater inflow from Endeavor 532 and Endeavor 538 cruises in 2013 and 2014
No full textDataset: Chlorophyll-a: EN532 and EN538Chlorophyll-a concentrations from CTD cast deployments and underway seawater inflow from Endeavor 532 and Endeavor 538 cruises in 2013 (August and September) and 2014 (April and May).
For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/651784NSF Division of Ocean Sciences (NSF OCE) OCE-113634
Balaenoptera acutorostrata (minke whale) - NUVC-3553
No full textBalaenoptera acutorostrata (minke whale) - NUVC-3553 - female - 6.89 m - Pelvic location - University of Georgia 22-foot, female washed ashore at Nauset Beach, Orleans, Barnstable Co., MA. Most of skeleton, missing right flipper with humerus which was accidently left on beach, all 7 cervical vertebra, 1 thoracic vertebra, 15 of 22 ribs, all 3 hyoid bones, 1 pelvic bone, and the sternum, salvaged on 19 June for Northeastern Univ., Boston
Balaenoptera physalus (fin whale) - norway-pelvic
No full textBalaenoptera physalus (fin whale) - norway-pelvic - unknown sex - unknown length - Pelvic location - Bergen Museum, Norwa