ORCID Profile
0000-0002-6380-7325
Current Organisations
University of South Australia
,
Australian Institute of Business
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Publisher: Copernicus GmbH
Date: 04-03-2021
DOI: 10.5194/EGUSPHERE-EGU21-8499
Abstract: & & & & The change in planetary albedo due to aerosol-cloud interactions (aci) during the industrial era is the leading source of uncertainty in inferring& Earth's& climate sensitivity to increased greenhouse gases from the historical record. Examining pristine environments such as the Southern Ocean (SO) helps us to understand the pre-industrial state and constrain the change in cloud brightness over the industrial period associated with aci. This study presents two methods of utilizing observations of pristine environments to examine climate models and our understanding of the pre-industrial state.& & & / & & & & & First, cloud droplet number concentration (& em& N& sub& d& /sub& & /em& ) is used as an indicator of aci. Global climate models (GCMs) show that the& hemispheric contrast& in liquid cloud & em& N& sub& d& /sub& & /em& between the& ristine SO& and the polluted& Northern Hemisphere observed in the present-day can be used& strong& & /strong& as& a proxy for the increase& in & em& N& sub& d& /sub& & /em& from& the pre-industrial. A hemispheric difference constraint& developed from MODIS satellite observations indicates that pre-industrial& & em& N& sub& d& /sub& & /em& may have been higher than previously thought and provides an estimate of radiative forcing associated with aci between -1.2 and -0.6 Wm& sup& -2& /sup& . Comparisons with MODIS & em& N& sub& d & & /sub& & /em& highlight significant GCM discrepancies in pristine, biologically active regions.& & & / & & & & & Second, aerosol and cloud microphysical observations from a recent SO aircraft c aign are used to identify two potentially important mechanisms that are incomplete or missing in GCMs: i) production of new aerosol particles through synoptic uplift, and ii) buffering of & em& N& sub& d& /sub& & /em& against precipitation removal by small, Aitken mode aerosols entrained from the free troposphere. The latter may significantly contribute to the high, summertime SO & em& N& sub& d& /sub& & /em& levels which persist despite precipitation depletion associated with mid-latitude storm systems. Observational comparisons with nudged Community Atmosphere Model version 6 (CAM6) hindcasts show low-biased SO & em& N& sub& d & & /sub& & /em& is linked to under-production of free-tropospheric Aitken aerosol which drives low-biases in cloud condensation nuclei number and likely discrepancies in composition. These results have important implications for the ability of current GCMs to capture aci in pristine environments.& & & / &
Publisher: IEEE
Date: 06-09-2021
Publisher: Copernicus GmbH
Date: 28-08-2020
DOI: 10.5194/ACP-20-10063-2020
Abstract: Abstract. Aerosol measurements over the Southern Ocean are used to constrain aerosol–cloud interaction radiative forcing (RFaci) uncertainty in a global climate model. Forcing uncertainty is quantified using 1 million climate model variants that s le the uncertainty in nearly 30 model parameters. Measurements of cloud condensation nuclei and other aerosol properties from an Antarctic circumnavigation expedition strongly constrain natural aerosol emissions: default sea spray emissions need to be increased by around a factor of 3 to be consistent with measurements. Forcing uncertainty is reduced by around 7 % using this set of several hundred measurements, which is comparable to the 8 % reduction achieved using a erse and extensive set of over 9000 predominantly Northern Hemisphere measurements. When Southern Ocean and Northern Hemisphere measurements are combined, uncertainty in RFaci is reduced by 21 %, and the strongest 20 % of forcing values are ruled out as implausible. In this combined constraint, observationally plausible RFaci is around 0.17 W m−2 weaker (less negative) with 95 % credible values ranging from −2.51 to −1.17 W m−2 (standard deviation of −2.18 to −1.46 W m−2). The Southern Ocean and Northern Hemisphere measurement datasets are complementary because they constrain different processes. These results highlight the value of remote marine aerosol measurements.
Publisher: Springer Science and Business Media LLC
Date: 06-05-2021
Publisher: Emerald
Date: 08-08-2021
Abstract: In reaction to the environmental challenge, many firms are looking for the ways how to integrate sustainability into their operations, business models and strategies. Very often sustainable initiatives go beyond the boundaries of a focal firm engaging a wide variety of partners within the supply chain. In conditions of countries with institutional deficiencies and voids such as emerging economies, the task of sustainability integration is challenging as many critical conditions needed for sustainability development are missing. To understand how firms can integrate sustainability initiatives in their supply chains under the conditions of environmental uncertainty, this paper aims to investigate firm-level and supply chain drivers that stimulate sustainability implementation in Russian firms. Using the s le of 273 large Russian firms the paper explores how firm-level drivers such as innovativeness, risk-taking and internationalization, as well as collaboration and integration in the supply chain are related to sustainability performance and sustainability transformation in supply chain. The hypotheses are tested using regression analysis and the bootstrapping technique. The study indicates the positive association between sustainability performance and sustainability transformation of the firm and such strategic drivers as a firm’s innovativeness and internationalization. The positive moderating effect of environmental uncertainty was found for innovativeness indicating that innovative firms show better sustainable performance in the supply chain under uncertain conditions. Also, the findings indicate that environmental uncertainty positively moderates the relationships between a firm’s transformation for sustainability, its internationalization and supply chain integration and coordination. The obtained results contribute to a better understanding of mechanisms that drive firms’ sustainability performance and transformation in conditions of emerging markets. The paper provides an adaptation and empirical testing of Silvestre’s (2015) theoretical model for sustainable supply chain management in emerging economies.
Publisher: Wiley
Date: 24-06-2022
DOI: 10.1111/EMRE.12536
Abstract: The integration of closed‐loop (CL) principles in supply chain management plays an important role for business and society. The CL supply chain can serve as a good ex le of an environment‐friendly and sustainable solution because it assumes waste reduction and further usage in production. Hence, the notion of the CL supply chain is premised on the design, control and operation of a system that creates extra value using the entire product life cycle and capture value recovery from various returns over time. In practice, a successful integration of CL principles depends on many contextual factors. This study aimed to identify the factors that support and discourage CL supply chain innovations in emerging markets. The study employed institutional theory as theoretical background and conducted an in‐depth case analysis of a Russian waste management company to present empirical evidence. The results showed that cooperation with an experienced and legitimate partner can drive the introduction of a CL initiative. Meanwhile, a low level of knowledge and trust might become a serious impediment. Thus, investment in knowledge dissemination and reputation building are crucial in an emerging market.
Publisher: Routledge
Date: 06-11-2019
No related grants have been discovered for Anna Levchenko.