220 research outputs found
Volcanic stratospheric sulfur injections during the Holocene (past 11 500 years) from a bipolar ice-core array, HolVol version 1.1
No full textBased on a set of continuous sulfate and sulfur records from four ice cores, one from Greenland and three from Antarctica, the HolVol v.1.0 database (Sigl et al., 2021, PANGAEA) included estimates of the magnitudes and approximate source latitudes of major volcanic stratospheric sulfur injection (VSSI) events for the Holocene (from 9500 BCE or 11 500 years BP to 1900 CE). In total, we reconstructed 850 volcanic eruptions with injections more than 1 teragram of sulfur (Tg S). These eruptions injected 7410 Tg S into the stratosphere. With the entire reconstructions based on the same four ice cores this reconstruction is best suited to study the frequency and spatial distribution of volcanic activity and resulting VSSI over long time periods and to study drivers and feedbacks between volcanism and climate through time (Sigl et al., 2022).
Here we update the database to HolVol v.1.1 as follows: First, we replace the HolVol reconstruction younger than 500 BCE with a similar reconstruction (eVolv2k; Toohey & Sigl 2017) which is based on a larger network of ice cores with on average higher depth resolution and for which important eruption source parameters (i.e. SSI, latitude, eruption season) have been constrained through dedicated geochemical (e.g. cryptotephra, sulfur isotopes, trace element) analyses (eVolv2k_version4, Sigl & Toohey, PANGAEA, doi:10.1594/PANGAEA.971968). For consistency across the different datasets, we updated the default latitudes for unidentified volcanic eruptions suspected in the Northern Hemisphere extra-tropics from 45°N to 48°N, for those suspected in the Southern Hemisphere extra-tropics from 45°S to 37°S and for those suspected in the tropics from 0° to 5°N (with the latter values being the default latitudes for HolVol, calculated from the mean distribution of large volcanic eruptions in geologic eruption catalogues).
Second, we updated strengths of VSSI, the timing and location of specific caldera-forming (VEI≥6) volcanic eruptions that we identified through geochemical fingerprinting (e.g. cryptotephra analysis; sulfur isotope analysis) and geochronological tools during the Mid-to-late Holocene using additional ice cores and new analyses (e.g. Aniakchak II, Crater Lake). The new HolVol v.1.1 database includes 1365 VSSI events between 9500 BCE to 2000 CE which injected in total 7370 TgS or 0.65 TgS per year on average. Dating uncertainties are +/- 1 to +/-3 years over the past 2,500 years, +/-5 years between 2000 BCE and 500 BCE, and less than +/-10 years before 2000 BCE
Prosperity for all? How low income families have fared in the boom times
No full textIn this paper for the 2004 Australian Institute of Family Studies conference Justine McNamara, Rachel Lloyd, Matthew Toohey and Ann Harding profile the situation of Australia\u27s most economically disadvantaged children from the late 1990s until 2004. They show that average real incomes rose for Australian families with children in the bottom income quintile, and on average just kept up with increases in median family incomes. These overall increases, however, need to be interpreted in the context of variations among families in improvements in economic wellbeing, the crucial role of government transfer payments in maintaining incomes in these families, and the continuing prevalence of joblessness among low income families
Helping Client to Rise Above the Impact of An Abusive Relationship-Identifying Patterned Behaviour in Culturally Diverse Clients
No full textHelping Client to Rise Above the Impact of An Abusive Relationship-Identifying Patterned Behaviour in Culturally Diverse Clients by Monique Toohey for 1st Malaysia International Counselling Conference (MICC 2014). Monique Toohey is a consultant psychologist and owner of private psychology practice,NasihahConsulting Group Pty.Ltd. She is an award winning youth advocate and the author of Without You: Rising above the Impact of an abusive realtionship. The workshop covers risk factors for SV/DV, Prevention, Intercultural competence skills, cross cultural counselling skills
Mapping the Discipline of the Olympic Games An Author-Cocitation Analysis
No full textThe authors conducted an author cocitation analysis on prominent authors writing about the Olympics during the 1990s. Author cocitation is an established bibliometric technique that can be used to measure the relative similarities of topics written about by the cited authors. This enables a visual representation of the “intellectual space” of the discipline, in this case the Olympics, to be created for the period under review. So core and peripheral research areas are identified, along with their major contributors. The representation appears as a two-dimensional cluster-enhanced map. Subject expertise was then applied to the results to place labels on the generated clusters of authors and their topics
Volcanic stratospheric sulfur injection between 1733 and 1895 CE based on the eVolv2k-plus-D4i ice-core eruption catalogue
No full textBetween 1733 and 1895, a total of 35 additional volcanic eruptions were detected in the new high-resolution measurements (D4i dataset: "Greenland ice-core non-sea-salt sulfur concentrations and calculated volcanic sulfate deposition (1733-1900 CE)" (PANGAEA, doi:10.1594/PANGAEA.960977) of the D4 ice core (McConnel et al., 2007). For the same time period only 25 volcanic eruptions had previously been detected using an ice-core array from Greenland (including NEEM-2011-S1 and NGRIP) and Antarctica, making up the eVolv2k database [Toohey and Sigl, 2017]. 21 volcanic events in D4i are found to match events in the eVolv2k database, 8 tropical events and 13 Northern Hemisphere extratropical (NHET) events. Based on linear fits of eVolv2k volcanic stratospheric sulfur injections (VSSI) to the cumulative D4i sulfate deposition rates, we derive scaling factors to convert D4i volcanic sulfate depositions to VSSI. Fits are of high quality with R2 values of 0.91 and 0.99 for tropical and extratropical events, respectively. Of the remaining events identified in D4i but not included in eVolv2k, we find 11 that are tentatively attributable to VEI=4 events listed in the Volcanoes of the World [Global Volcanism Program, 2013] (GVP) database (e.g, Soufriere St. Vincent, and Awu in 1812; Suwanosejima in 1813; Mayon 1814; Raung 1817; Colima 1818). Although attribution is not completely certain, for these events we assume the attribution is correct and use the historically dated eruption date and location from Volcanoes of the World (Global Volcanism Program, 2013). Eruptions found in D4i which do not have a corresponding event in the GVP database could result from a number of scenarios. To avoid a potential bias by attributing these signals to either tropical latitudes (0°) or to NHET latitudes (i.e. 45°N), we represent the forcing by these unidentified events as the probability-weighted superposition of tropical and extratropical eruptions based on the measured sulfate flux. For each event we calculate the VSSI associated with the sulfate deposition assuming on the one hand the event was tropical, and on the other hand assuming it was extratropical. These VSSI values are then multiplied by the probability that the event was either tropical or extratropical, based on the proportion of NHET and tropical events in the Greenland records used in eVolv2k. Each unidentified sulfate deposition is then represented in the VSSI file as two injections, with the same eruption time taken from the ice ice-core dating, and different VSSI amounts for default tropical and extratropical regions. The resulting list of "additional" eruptions not included in eVolv2k is merged with eVolv2k, and the resulting eruption list named eVolv2k plus D4i used as input to the EVA forcing generator [Toohey et al., 2016] to generate time series of stratospheric aerosol optical depth (SAOD)
Mapping the Discipline of the Olympic Games An Author- Cocitation Analysis
No full textWhen most people think about the Olympic Games it is usually in terms of athletic performance. Clearly they are more than that (see Toohey & Veal, 1990). Even the mass media does not confine itself to covering only the sporting angle. For example, symbolism, economic factors, nationalism and politics routinely appear in mass media articles relating to the Olympic Games. There are scholarly journals that are devoted exclusively to the Olympic Games, such as Olympika and the Journal of Olympic History. So what do we mean when we talk about Olympic scholarship? Cursory scanning of other sport journals also reveals a plethora of subjects ranging from legal aspects to history to philatelic aspects among a host of Olympic topics. This paper questions how can we identify, classify and measure them.Olympic Games, Olympic scholarship, sport journal
Volcanic stratospheric sulphur injections and aerosol optical depth from 500 BCE to 1900 CE
No full textThe injection of sulphur into the stratosphere by explosive volcanic eruptions is the cause of significant climate variability. Based on sulphate records from a suite of ice cores from Greenland and Antarctica, the eVolv2k database includes estimates of the magnitudes and approximate source latitudes of major volcanic stratospheric sulphur injection (VSSI) events from 500 BCE to 1900 CE, constituting an update of prior reconstructions and an extension of the record by 1000 years. The VSSI estimates incorporate improvements to the ice core records in terms of synchronization and dating, refinements to the methods used to estimate VSSI from ice core records, and includes first estimates of the random uncertainties in VSSI values. VSSI estimates for many of the largest eruptions, including Samalas (1257), Tambora (1815) and Laki (1783) are within 10% of prior estimates. A number of strong events are included in eVolv2k which are largely underestimated or not included in earlier VSSI reconstructions, including events in 540, 574, 682 and 1108 CE. The long term annual mean VSSI from major volcanic eruptions is estimated to be ∼ 0.5 Tg [S] yr−1, ∼ 50 % greater than a prior reconstruction, due to the identification of more events and an increase in the magnitude of many intermediate events. A long-term, latitudinally and monthly resolved stratospheric aerosol optical depth (SAOD) time series is reconstructed from the eVolv2k VSSI estimates, and the resulting global mean SAOD is found to be similar (within 33%) to a prior reconstruction for most of the largest eruptions. The long-term (500 BCE–900 CE) average global mean SAOD estimated from the eVolv2k VSSI estimates and including a constant "background" injection of stratospheric sulphur is ∼ 0.014, 30 % greater than a prior reconstruction. These new long-term reconstructions of past VSSI and SAOD variability give context to recent volcanic forcing, suggesting that the 20th century was a period of somewhat weaker than average volcanic forcing, with current best estimates of 20th century mean VSSI and SAOD values being 25 and 14 % less, respectively, than the mean of the 500 BCE to 1900 CE period. The reconstructed VSSI and SAOD data are available at https://doi.org/10.1594/WDCC/eVolv2k_v2>
Heracles in Pindar : studies in his role and adaptation /by Peter G. Toohey.
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