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279 results for “Austral”
Snowpit chemistry from Canada, Commonwealth, and Rhone Glaciers, McMurdo Dry Valleys, Antarctica during the 2000-2001 austral summer
To examine temporal and spatial variability in snow chemistry during the 2000-2001 austral summer, snow samples were collected from the accumulation zones of Canada, Commonwealth, and Rhone Glaciers, located in Taylor Valley in the McMurdo Dry Valleys region of Antarctica. Snowpits were excavated to a depth of 2 meters at each location and samples were collected using a depth interval of 3 cm utilizing clean sampling techniques. Snow density was measured in the field at the time of sample collection. Samples were analyzed for major ions in the Crary Lab at McMurdo Station.
Physical and chemical characteristics of stream-associated snow patches in Fryxell Basin, McMurdo Dry Valleys, Antarctica during the 2021-2022 austral summer
Snow patches within and adjacent to stream channels in the Fryxell Basin of Taylor Valley, Antarctica were sampled during the 2021-2022 austral summer as part of the McMurdo Dry Valleys Long Term Ecological Research program. This data package includes snow pit measurements (snow temperature, depth, density, and water equivalent) as well as chemical characteristics of snow samples that were analyzed for nutrient, cation, and anion concentrations.
12.5 kHz raw echosounder data collected on the Antarctic Circumnavigation Expedition during the austral summer of 2016/2017.
<p><strong>Dataset abstract</strong></p> <p>These data consist of raw echosounder observations collected during ACE (Leg1-Leg3) using an EK80 WBT operating at 12.5 kHz. The instrument was calibrated at South Georgia during the expedition (Leg 3) and corrections were applied prior to calculation of the volume backscattering strength (Sv). The signal-to-noise ratio (SNR) was analysed and was deemed very poor at depths greater than 1000 m. Therefore, only data collected between the transducer depth (8.4 m) and 1000 m were archived. Sv values within this depth range that had poor SNRs (<2) were deemed to be bad data and set to a value of NA. Observations were made using a pulse duration of 16.384 ms (c. 24 m) and are therefore not suitable for fine-scale studies (e.g. analysis of krill swarms). They are more suited to studies relating to large-scale biological features such as deep scattering layers.</p> <p><strong>Dataset contents</strong></p> <ul> <li>ACE-DYYYYMMDD-THHMMSS.csv, data files, comma-separated values</li> <li>data_file_header.txt, metadata, text</li> <li>README.txt, metadata, text</li> </ul>
Phytoplankton pigment concentrations of seawater sampled during the Antarctic Circumnavigation Expedition (ACE) during the Austral Summer of 2016/2017.
<p><strong>Dataset abstract</strong></p> <p>This dataset contains phytoplankton pigment concentrations sampled during the Antarctic Circumnavigation Expedition (ACE) Leg 1-3 and analysed using high performance liquid chromatography. Water samples were collected from the underway seawater supply every 3 hours and at multiple depths from select CTD (conductivity, temperature and depth) rosette deployments. Pigment concentrations have been quality controlled. This circumpolar dataset contains the main pigment concentrations of phytoplankton and can be used to infer phytoplankton biomass and class composition.</p> <p><strong>Dataset contents</strong></p> <ul> <li>ace_phytoplankton_pigments_20200511CURRSGCMR.csv, data file, comma-separated values</li> <li>ace_phytoplankton_pigments_lod.csv, metadata, comma-separated values</li> <li>ace_phytoplankton_pigment_concentrations_change_log.txt, metadata, text</li> <li>data_file_header.txt, metadata, text</li> <li>README.txt, metadata, text</li> </ul> <p>Pigment concentration values below the limit of detection are reported with fill value ‘NaN’. Any null values are reported with fill value ‘NaN’.</p> <p><strong>Change log</strong></p> <p><strong>v1.1</strong><br> - Added statement to ReadMe in original data collection statement acknowledging analysis performed by Celine Dimier<br> - Added statement to Acknowledgements section of DOI acknowledging analysis performed by Celine Dimier<br> - Metadata for samples have been updated: AT/ACE/2/1/28/1026/DA/13 A_C07N17 and AT/ACE/1/1/14/402/DA/10<br> - Corrected ship name to R/V Akademik Tryoshnikov<br> - Corrected citation DOI for one minute cruise track</p> <p><strong>v1.0 </strong><br> - Initial release of phytoplankton pigment concentration dataset.</p>
Appendix. List of the 28S and 16S rRNA sequences recovered from GenBank. 28S = 28S rRNA GenBank accession number; 16S = 16S rRNA GenBank accession number. in Genetic and morphological evidence for cryptic species in Macrobrachium australe and resurrection of M. ustulatum (Crustacea, Palaemonidae)
Appendix. List of the 28S and 16S rRNA sequences recovered from GenBank. 28S = 28S rRNA GenBank accession number; 16S = 16S rRNA GenBank accession number.
Fig. 5 in Genetic and morphological evidence for cryptic species in Macrobrachium australe and resurrection of M. ustulatum (Crustacea, Palaemonidae)
Fig. 5. Macrobrachium ustulatus (Nobili, 1899). – A–B, E. MNHN-IU-2013-13202. A. Cephalothorax. B. Epistome. E. Major second pereiopod finger. – C, G. MNHN-IU-2013-13201. C. Fourth thoracic sternite. G. Minor second pereiopod finger. – D, F. MNHN-IU-2013-13203. D. Major second pereiopod. F. Minor second pereiopod. Scale bars: A, E, G = 2 mm; B–C = 1 mm; D, F = 4 mm.
Fig. 3 in Genetic and morphological evidence for cryptic species in Macrobrachium australe and resurrection of M. ustulatum (Crustacea, Palaemonidae)
Fig. 3. Macrobrachium australe (Guérin-Méneville, 1838 in Guérin-Méneville 1829–1838), MNHN- IU-2013-13198. A. Cephalothorax. B. Epistome. C. Fourth thoracic sternite. D. Major second pereiopod. E. Major second pereiopod finger. F. Minor second pereiopod. G. Minor second pereiopod finger. Scale bars: A, E, G = 2 mm; B–C = 1 mm; D, F = 4 mm.
Fig. 1 in Genetic and morphological evidence for cryptic species in Macrobrachium australe and resurrection of M. ustulatum (Crustacea, Palaemonidae)
Fig. 1. Map of the Indo-Pacific showing localities where Macrobrachium australe (Guérin-Méneville, 1838 in Guérin-Méneville 1829–1838) (black area) and M. ustulatum (Nobili, 1899) (red area) were collected and/or recorded. Capitalized locality names correspond to the 7 localities sampled for this study. Non-capitalized locality names correspond to the localities reported from the literature. Stars shows the type localities of the synonyms of M. australe (black stars) and M. ustulatum (red star).
Fig. 4. A in Genetic and morphological evidence for cryptic species in Macrobrachium australe and resurrection of M. ustulatum (Crustacea, Palaemonidae)
Fig. 4. A. Live coloration of Macrobrachium australe (Guérin-Méneville, 1838 in Guérin-Méneville 1829–1838) (photo: E. Vigneux). B. Live coloration of M. ustulatum (Nobili, 1899) (photo: P. Keith).
Dissolved inorganic nitrate, nitrite, silicate and phosphate concentrations of seawater sampled during the Antarctic Circumnavigation Expedition (ACE) during the Austral Summer of 2016/2017.
<p><strong>Dataset abstract</strong></p> <p>This dataset contains dissolved inorganic nitrate, nitrite, silicate and phosphate concentrations of seawater sampled during the Antarctic Circumnavigation Expedition (ACE) Legs 1-3. Water samples were collected from the underway seawater supply every 3 hours, preserved and analysed for dissolved inorganic nutrient concentrations using flow injection and colorimetric methods. These samples provide an estimate of the dissolved concentrations of inorganic macronutrients essential for phytoplankton growth.</p> <p><strong>Dataset contents</strong></p> <ul> <li>README.txt, metadata, text</li> <li>data_file_header.txt, metadata, text</li> <li>ace_uw_nutrients_20200527CURRSGCMR.csv, data file, comma-separated values</li> <li>change_log.txt, metadata, text</li> </ul> <p><strong>Change log</strong></p> <p>v1.1 - changed order of authors in publication and citation in README</p> <p>v1.0 - initial release of dataset</p>
Trace gas mixing ratios measured over the Southern Ocean in the austral summer of 2016/2017, during the Antarctic Circumnavigation Expedition.
<p><strong>Dataset abstract</strong></p> <p>The authors would highly appreciate to be contacted if the data is used for any purpose.</p> <p>We measured mixing ratios of CO, CO<sub>2</sub> and CH<sub>4</sub> with a PICARRO G2401 Gas Analyzer. Ozone (O<sub>3</sub>) mixing ratios were measured with a 2B Technology ozone monitor, model 205. We report five-minute averaged data cleaned from exhaust gas influence. Temporal coverage is from December 20, 2016 to April 10, 2017.</p> <p>The trace gas concentrations represent a large number of atmospheric processes that happen on different time scales. CO for example, has basically no sources other than combustion and can hence be used as tracer for air mass transport from regions with combustion activities (e.g., South Africa). CO has a lifetime of a few weeks. CO<sub>2</sub> and CH<sub>4</sub> are longer-lived trace gases which disperse globally. The data set shows that concentrations in the Northern Hemisphere are higher than in the Southern Hemisphere. Both trace gases are emitted by anthropogenic activities as well as natural sources. Over the cruise track, areas of the Southern Ocean were passed where these trace gases either outgas or are absorbed. Ozone is a secondary trace gas, meaning that it is formed in the atmosphere. It’s concentrations are relatively low.</p> <p>All trace gases data have been cleaned from exhaust gas influence.</p> <p><strong>Dataset contents</strong></p> <ul> <li>ACESPACE_trace_gas_concentration.csv, data file, comma-separated values</li> <li>data_file_header.txt, metadata, text</li> <li>README.txt, metadata, text</li> <li>change_log.txt, metadata, text</li> </ul> <p>NaN values denote missing values because of e.g., ship exhaust contamination or instrument maintenance. For latitude and longitude, NaN values are noted in cases where position data was not available for the given time period.</p> <p><strong>Dataset license</strong></p> <p>This trace as mixing ratio dataset from ACE is made available under the Creative Commons Attribution 4.0 International License (CC BY 4.0) whose full text can be found at https://creativecommons.org/licenses/by/4.0/</p> <p><strong>Change log</strong></p> <p>v1.1 - data file updated<br> - Ozone was corrected because a wrong calibration factor was applied in version 1.0<br> - CO2 and CH4 are now dry mixing ratios, the previous data were not corrected for water vapour<br> - README updated accordingly with details of changes to processing<br> - added change_log.txt file</p> <p>v1.0 - initial release of dataset</p>
FIGURE 3. Calcinus gouti Poupin, 1997 in Hermit crabs of the genus Calcinus Dana, 1851 (Decapoda: Anomura: Diogenidae) from the Austral Islands, French Polynesia, with description of a new species
FIGURE 3. Calcinus gouti Poupin, 1997, ɗ 5.0 mm, Tikehau Atoll, 15 m (UF 1349): a, anterior portion of shield and cephalic appendages; b, left chela and carpus, outer face; c, right chela and carpus, outer face; d, right P 2, outer face; e, right P 3, outer face; f, posterior portion of telson, ventral view. Scale bars 1 mm.
FIGURE 5 in Hermit crabs of the genus Calcinus Dana, 1851 (Decapoda: Anomura: Diogenidae) from the Austral Islands, French Polynesia, with description of a new species
FIGURE 5. Left chela: a, Calcinus albengai n. sp., holotype ɗ 3.8 mm, Marotiri Isles, 100 – 120 m (MNHN Pg 6359); b, Calcinus aff. sirius, ov. Ψ 5.5 mm, Rapa Island, 100 m (MNHN Pg 6395). Scale bars 1 mm.
FIGURE 1 in Hermit crabs of the genus Calcinus Dana, 1851 (Decapoda: Anomura: Diogenidae) from the Austral Islands, French Polynesia, with description of a new species
FIGURE 1. Live coloration (except b, taken several weeks after preservation): a, Calcinus albengai n. sp., deepwater variant, holotype ɗ 3.8 mm, Marotiri Isles, 100 – 120 m (MNHN Pg 6359); b, Calcinus albengai n. sp., shallowwater variant, ɗ 3.5 mm, Rapa Island, 53 m (MNHN Pg 6382); c, Calcinus gouti Poupin, 1997, ɗ 5.0 mm, Tikehau, 15 m (UF 1349); d, Calcinus aff. sirius Morgan, 1991, 1 ov. Ψ 5.5 mm, Rapa Island, 100 m (MNHN Pg 6395). Photographs by L. Albenga (a, b), G. Paulay (c), and J. Poupin (d).
FIGURE 4. Calcinus aff. sirius Morgan, 1991 in Hermit crabs of the genus Calcinus Dana, 1851 (Decapoda: Anomura: Diogenidae) from the Austral Islands, French Polynesia, with description of a new species
FIGURE 4. Calcinus aff. sirius Morgan, 1991, ov. Ψ 5.5 mm, Rapa Island, 100 m (MNHN Pg 6395): a, distal part of propodus, and dactyl of left P 2, outer face; b, left P 2, outer face; c, left P 3, outer face. Scale bars 1 mm.
FIGURE 2. Calcinus albengai n in Hermit crabs of the genus Calcinus Dana, 1851 (Decapoda: Anomura: Diogenidae) from the Austral Islands, French Polynesia, with description of a new species
FIGURE 2. Calcinus albengai n. sp.: a – f, holotype ɗ 3.8 mm, Marotiri Isles (MNHN Pg 6359); g, paratype ov. Ψ 3.0 mm, Neilson Reef, 150 m (MNHN Pg 6361); h, ɗ 3.5 mm, Rapa Island, 53 m (MNHN Pg 6382). a, anterior portion of shield and cephalic appendages; b, left chela and carpus, outer face; c, right chela and carpus, outer face; d, left P 2 of deepwater variant, outer face; e, left P 3 of deepwater variant, outer face; f, posterior portion of telson, ventral view; g, left chela and carpus, outer face; h, left P 3 of shallowwater variant, outer face. Scale bars 1 mm.
Particulate methylsulfonic acid (MSA), sodium and chloride concentrations from high-volume air filter samples over the Southern Ocean during austral summer of 2016/2017 on board the Antarctic Circumnavigation Expedition (ACE).
<p><strong>Dataset abstract</strong></p> <p>Aerosol particles come from a variety of sources: a look at the chemical composition gives insights on the particle origin. Ion chromatography was performed for aerosol particles smaller than 10 micrometers (PM10 inlet), giving concentrations of sodium and chloride, as well as particulate methylsulfonic acid (MSA). For this, aerosol particles where sampled on quartz fibre filters for 24 hours each. The sampled filters were stored at -20 degrees C on the research vessel, transported frozen back to the chemistry lab of TROPOS and analysed for main ions. Temporal coverage is from December 20, 2016 to March 20, 2017. We give 24-hour quality controlled particulate MSA, sodium and chloride concentrations in microgram per cubic meter for the Antarctic Circumnavigation Expedition (ACE) cruise over the Southern Ocean, as part of the ACE-SPACE project.</p> <p><strong>Dataset contents</strong></p> <ul> <li>ACESPACE_ particulate_MSA_Sodium_Chloride_PM10, data file, comma-separated values</li> <li>data_file_header, metadata, text format</li> <li>README.txt, metadata, text format</li> </ul>
FABIAN: a daily product of Fractional Austral-summer Blue Ice over ANtarctica during 2000-2021 based on MODIS imagery using Google Earth Engine
<p>This is a supplementary data set for FABIAN: a daily product of Fractional Austral-summer Blue Ice over ANtarctica during<br> 2000{2021 based on MODIS imagery using Google Earth Engine</p> <p>The files include:</p> <p>(1) Snow spectra modelled by TARTES, a two-stream radiative transfer model for light in snow (Libois et al., 2013).</p> <p>(2) Spectra extracted from MODIS, using AUTO-EM.</p> <p>(3) Endmember selection results, including ESS, EMC, and AMUSES.</p> <p>The other hyperspectral data from field measurements can be acquired by contact the original authors.</p> <p>Libois, Q., Picard, G., France, J., Arnaud, L., Dumont, M., Carmagnola, C., King, M., 2013. Influence of grain shape on light penetration in snow. The Cryosphere 7, 1803-1818.</p>
Fig. 1 in On the original material of two austral American Senecio species (Compositae) collected during British naval expeditions in 1828, now located in the herbarium of Geneva
Fig. 1. – Lectotype of Senecio bipinnatifidus Hook. & Arn. [G00432676; Conservatoire et Jardin botaniques de Genève]
Fig. 3 in On the original material of two austral American Senecio species (Compositae) collected during British naval expeditions in 1828, now located in the herbarium of Geneva
Fig. 3. – Holotype of Senecio websteri Hook. f. [G00432677; Conservatoire et Jardin botaniques de Genève]
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