ORCID Profile
0000-0001-5261-0677
Current Organisations
CEA Saclay
,
Western Sydney University
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Publisher: Copernicus GmbH
Date: 06-07-2020
Abstract: Abstract. Anthropogenic climate change is projected to lead to ocean warming, acidification, deoxygenation, reductions in near-surface nutrients, and changes to primary production, all of which are expected to affect marine ecosystems. Here we assess projections of these drivers of environmental change over the twenty-first century from Earth system models (ESMs) participating in the Coupled Model Intercomparison Project Phase 6 (CMIP6) that were forced under the CMIP6 Shared Socioeconomic Pathways (SSPs). Projections are compared to those from the previous generation (CMIP5) forced under the Representative Concentration Pathways (RCPs). A total of 10 CMIP5 and 13 CMIP6 models are used in the two multi-model ensembles. Under the high-emission scenario SSP5-8.5, the multi-model global mean change (2080–2099 mean values relative to 1870–1899) ± the inter-model SD in sea surface temperature, surface pH, subsurface (100–600 m) oxygen concentration, euphotic (0–100 m) nitrate concentration, and depth-integrated primary production is +3.47±0.78 ∘C, -0.44±0.005, -13.27±5.28, -1.06±0.45 mmol m−3 and -2.99±9.11 %, respectively. Under the low-emission, high-mitigation scenario SSP1-2.6, the corresponding global changes are +1.42±0.32 ∘C, -0.16±0.002, -6.36±2.92, -0.52±0.23 mmol m−3, and -0.56±4.12 %. Projected exposure of the marine ecosystem to these drivers of ocean change depends largely on the extent of future emissions, consistent with previous studies. The ESMs in CMIP6 generally project greater warming, acidification, deoxygenation, and nitrate reductions but lesser primary production declines than those from CMIP5 under comparable radiative forcing. The increased projected ocean warming results from a general increase in the climate sensitivity of CMIP6 models relative to those of CMIP5. This enhanced warming increases upper-ocean stratification in CMIP6 projections, which contributes to greater reductions in upper-ocean nitrate and subsurface oxygen ventilation. The greater surface acidification in CMIP6 is primarily a consequence of the SSPs having higher associated atmospheric CO2 concentrations than their RCP analogues for the same radiative forcing. We find no consistent reduction in inter-model uncertainties, and even an increase in net primary production inter-model uncertainties in CMIP6, as compared to CMIP5.
Publisher: Informa UK Limited
Date: 18-05-2023
Publisher: Wiley
Date: 18-05-2023
DOI: 10.1111/AJR.12994
Abstract: Australian rural and remote areas are faced with the double burden of an ageing population paired with inequitable access to health resources due to the paradigm of major city centred health care. This complicates fall management within this space. Paramedics are a registered health profession, which provides mobile, equitable health care. However, this resource is not being effectively utilised in rural and remote areas where primary care access barriers may cause patient needs to go unmet. To describe the existing literature and describe the international scope of current paramedicine practice in the out‐of‐hospital management of falls amongst older adults in rural and remote settings. Joanna Briggs Institute scoping review methodology was employed. CINAHL (EBSCO), MEDLINE (Ovid), EMBASE (Ovid), SCOPUS (Elsevier), Google Scholar and These Global were searched and Australian, New Zealand and the UK ambulance service guidelines were sought. Two records met inclusion criteria. Currently, rural and remote paramedic fall management involves preventative health promotion through patient education, population‐based screening and referrals. The use of paramedics to screen at‐risk populations and refer is vital, as many rural adults had screened positive to fall risks and other unmet needs. There is poor recollection of physically printed education material and low acceptance of further in‐home assessments following paramedic departure. This scoping review has highlighted a significant knowledge gap on this topic. Further research is needed to effectively utilise paramedicine within areas where access to primary care is not possible to achieve downstream, risk reducing care in the home.
Publisher: American Meteorological Society
Date: 05-2013
Abstract: The overturning circulation of the Southern Ocean has been investigated using eddying coupled ocean–sea ice models. The circulation is diagnosed in both density–latitude coordinates and in depth–density coordinates. Depth–density coordinates follow streamlines where the Antarctic Circumpolar Current is equivalent barotropic, capture the descent of Antarctic Bottom Water, follow density outcrops at the surface, and can be interpreted energetically. In density–latitude coordinates, wind-driven northward transport of light water and southward transport of dense water are compensated by standing meanders and to a lesser degree by transient eddies, consistent with previous results. In depth–density coordinates, however, wind-driven upwelling of dense water and downwelling of light water are compensated more strongly by transient eddy fluxes than fluxes because of standing meanders. Model realizations are discussed where the wind pattern of the southern annular mode is lified. In density–latitude coordinates, meridional fluxes because of transient eddies can increase to counter changes in Ekman transport and decrease in response to changes in the standing meanders. In depth–density coordinates, vertical fluxes because of transient eddies directly counter changes in Ekman pumping.
No related grants have been discovered for Navindhra Naidoo.