Numerical Simulations of the Impacts of Land-Cover Change on Cold Fronts in South-West Western Australia

Kala, Jatin; Lyons, Thomas J.; Nair, U. S.

doi:10.1007/s10546-010-9547-3

Cited by 22 publications

(20 citation statements)

References 46 publications

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“…In this semiarid environment, the removal of native vegetation has clearly reduced the development of the PBL by altering surface fluxes and consequently altered cloud dynamical processes. Hence this study further reinforces previous work which has shown that land cover change may be partly responsible for the decrease in precipitation in SWWA (Pitman et al, 2004;Kala et al, 2011;Nair et al, 2011).…”

Section: Discussionsupporting

confidence: 91%

“…The soil-vegetation model was activated for all runs and the vegetation biophysical parameters (albedo, fractional vegetation cover and minimum stomatal resistance) were changed to monthly values published in to better reflect the growing stage of the native vegetation and crop for December and August. This study used the same input geographical datasets as described in Kala et al (2011), including 9s (∼250 m) topography (Hutchinson et al, 2009) and the Australian Surveying and Land Information Group (AUSLIG) current and pre-European (undisturbed) vegetation datasets (AUSLIG, 1990).…”

Section: Model Description and Initializationmentioning

confidence: 99%

“…These data provide monthly means of upper (surface to 0.2 m) and lower (0.2-1.5 m) relative soil moisture (percentage of field capacity) across the Australian continent at a 5 × 5 km grid spacing. A two-week spin-up was carried out using the AWAP data and following the same model specifications as described in Kala et al (2011), except that a fourth nested grid was used to obtain a resolution of 1 km. The soil moisture and soil temperature output from this spin-up run was then interpolated to the 250 m LES grid.…”

Section: Model Description and Initializationmentioning

confidence: 99%

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Large‐eddy simulations of surface influences on planetary boundary layer development in southwest Western Australia

Kala

Lyons

Nair

et al. 2012

Quart J Royal Meteoro Soc

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Observations from near-simultaneous atmospheric soundings released over contrasting land surfaces in the southwest of Western Australia during December 2005 (austral summer) and August 2007 (late austral winter or early spring) have shown higher planetary boundary layer (PBL) heights over native vegetation as compared to agricultural land. The large-eddy simulation technique is used to investigate the drivers behind these observed differences in PBL, and sensitivity tests are carried out with modified soil moisture and vegetation cover. It is shown that the differences in PBL for the December case are mainly driven by the change in vegetation cover, while a soil moisture gradient also played a role for the August case. The mixing diagram approach is used to further quantify the relative contributions of surface and entrainment fluxes on the growth of the PBL and it is shown that, while dry-air entrainment plays an important role in PBL development, it is the higher surface Bowen ratio which drives the more vigorous PBL development over the native vegetation. It is also shown that the enhanced PBL development over the native vegetation leads to the preferential formation of shallow convective clouds for the August case.

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Section: Discussionsupporting

confidence: 91%

Section: Model Description and Initializationmentioning

confidence: 99%

Section: Model Description and Initializationmentioning

confidence: 99%

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Large‐eddy simulations of surface influences on planetary boundary layer development in southwest Western Australia

Kala

Lyons

Nair

et al. 2012

Quart J Royal Meteoro Soc

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“…Land-use change (LUC) also affects the mean climate (Pitman et al 2009;Pielke et al 2011;de Noblet-Ducoudré et al 2012) and climate extremes (e.g., Pitman et al 2012), particularly at regional scales (Deo et al 2009;Kala et al 2011;Nair et al 2011;Avila et al 2012). The persistence of droughts and heat waves has also been linked to land processes, mostly through the soil moisture limitation of evapotranspiration (Fischer et al 2007;Lorenz et al 2010;Jaeger and Seneviratne 2011;Zhang and Wu 2011;Mueller and Seneviratne 2012;Roundy et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Modulation of Land-Use Change Impacts on Temperature Extremes via Land–Atmosphere Coupling over Australia

et al. 2015

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The role of land-atmosphere coupling in modulating the impact of land-use change (LUC) on regional climate extremes remains uncertain. Using the Weather and Research Forecasting Model, this study combines the Global Land-Atmosphere Coupling Experiment with regional LUC to assess the combined impact of land-atmosphere coupling and LUC on simulated temperature extremes. The experiment is applied to an ensemble of planetary boundary layer (PBL) and cumulus parameterizations to determine the sensitivity of the results to model physics. Results show a consistent weakening in the soil moisture-maximum temperature coupling strength with LUC irrespective of the model physics. In contrast, temperature extremes show an asymmetric response to LUC dependent on the choice of PBL scheme, which is linked to differences in the parameterization of vertical transport. This influences convective precipitation, contributing a positive feedback on soil moisture and consequently on the partitioning of the surface turbulent fluxes. The results suggest that the impact of LUC on temperature extremes depends on the land-atmosphere coupling that in turn depends on the choice of PBL. Indeed, the sign of the temperature change in hot extremes resulting from LUC can be changed simply by altering the choice of PBL. The authors also note concerns over the metrics used to measure coupling strength that reflect changes in variance but may not respond to LUC-type perturbations.

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“…Kala et al, 2011;Lobell and Bonfils, 2008;Lim et al, 2005). Where LULCC has been intensive, the regional impact is likely to be at least as important as GHG and aerosol forcing de Noblet-Ducoudré et al, 2012;Lawrence and Chase, 2010).…”

Section: Lulcc Influences On the Climate Systemmentioning

confidence: 99%

Towards decision-based global land use models for improved understanding of the Earth system

et al. 2014

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Abstract.A primary goal of Earth system modelling is to improve understanding of the interactions and feedbacks between human decision making and biophysical processes. The nexus of land use and land cover change (LULCC) and the climate system is an important example. LULCC contributes to global and regional climate change, while climate affects the functioning of terrestrial ecosystems and LULCC. However, at present, LULCC is poorly represented in global circulation models (GCMs). LULCC models that are explicit about human behaviour and decision-making processes have been developed at local to regional scales, but the principles of these approaches have not yet been applied to the global scale level in ways that deal adequately with both direct and indirect feedbacks from the climate system. In this article, we explore current knowledge about LULCC modelling and the interactions between LULCC, GCMs and dynamic global vegetation models (DGVMs). In doing so, we propose new ways forward for improving LULCC representations in Earth system models. We conclude that LULCC models need to better conceptualise the alternatives for upscaling from the local to global scale. This involves better representation of human agency, including processes such as learning, adaptation and agent evolution, formalising the role and emergence of governance structures, institutional arrangements and policy as endogenous processes and better theorising about the role of teleconnections and connectivity across global networks. Our analysis underlines the importance of observational data in global-scale assessments and the need for coordination in synthesising and assimilating available data. Published by Copernicus

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Numerical Simulations of the Impacts of Land-Cover Change on Cold Fronts in South-West Western Australia

Cited by 22 publications

References 46 publications

Large‐eddy simulations of surface influences on planetary boundary layer development in southwest Western Australia

Large‐eddy simulations of surface influences on planetary boundary layer development in southwest Western Australia

Modulation of Land-Use Change Impacts on Temperature Extremes via Land–Atmosphere Coupling over Australia

Towards decision-based global land use models for improved understanding of the Earth system

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