A5023190596- Climate variability and models
- Meteorological Phenomena and Simulations
- Atmospheric aerosols and clouds
- Tropical and Extratropical Cyclones Research
- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Oceanographic and Atmospheric Processes
- Precipitation Measurement and Analysis
- Geophysics and Gravity Measurements
- Atmospheric Ozone and Climate
- Hydrology and Drought Analysis
- Plant Water Relations and Carbon Dynamics
- Urban Transport and Accessibility
- Transportation Planning and Optimization
- Cryospheric studies and observations
- Fluid Dynamics and Turbulent Flows
- Aeolian processes and effects
- Climate change impacts on agriculture
- Urban Stormwater Management Solutions
- Radiomics and Machine Learning in Medical Imaging
- Ocean Waves and Remote Sensing
- Traffic and Road Safety
- Amphibian and Reptile Biology
- Wind and Air Flow Studies
- Distributed and Parallel Computing Systems
Monash University
2016-2025
Australian Research Council
2015-2025
Australian Regenerative Medicine Institute
2008-2025
ARC Centre of Excellence for Climate System Science
2014-2024
Delft University of Technology
2021
Bureau of Meteorology
2002-2012
Lawrence Livermore National Laboratory
2010-2012
Collaboration for Australian Weather and Climate Research
2012
Stony Brook University
2012
Pacific Northwest National Laboratory
2010-2011
Abstract Clouds simulated by the European Centre for Medium-Range Weather Forecasts (ECMWF) model are composited to derive typical organization of clouds surrounding a midlatitude baroclinic system. Comparison this composite about 200 cyclones with that based on satellite data reveals ECMWF quite accurately simulates general positioning relative low pressure center. However, optical depths model’s high/low too small/large observations, and lacks midlevel topped observed west surface cold...
Atmospheric fronts are important for the day‐to‐day variability of weather in midlatitudes, particularly during winter when extratropical storm‐tracks at their maximum intensity. Fronts often associated with heavy rain, and strongly affect local space‐time distribution rainfall. A recently developed objective front identification method that distinguishes between cold, warm quasi‐stationary fronts, is applied to reanalysis data combined a daily global gridded set investigate how...
An overview is given of the First ISCCP Regional Experiment Arctic Clouds that was conducted during April–July 1998. The principal goal field experiment to gather data needed examine impact arctic clouds on radiation exchange between surface, atmosphere, and space, study how surface influences evolution boundary layer clouds. observations will be used evaluate improve climate model parameterizations cloud processes, satellite remote sensing characteristics, understanding cloud–radiation...
Abstract Revisions to the convection, radiation and cloud schemes recently introduced into European Centre for Medium‐Range Weather Forecasts (ECMWF) Integrated Forecasting System (IFS) are described, together with discussion of their impact upon model performance. Seasonal simulations observed sea surface temperatures (SSTs) June/July/August 1987 December/January/February 1987/88 a low‐resolution (T63) version used assess revised schemes, concentrating tropical climate variability. While...
Identifying cloud regimes and their role in the climate system can serve a multitude of purposes, ranging from better understanding clouds to guiding field experiments improving representation models. This study describes early results identifying ISCCP data using cluster analysis. A simple algorithm for regime identification is introduced applied Tropical Western Pacific region. Four major regimes, namely shallow cumulus regime, transparent isolated cirrus thick with convection deep...
A comprehensive dataset describing tropical cloud systems and their environmental setting impacts has been collected during the Tropical Warm Pool International Cloud Experiment (TWPICE) Aerosol Chemical Transport in Convection (ACTIVE) campaign area around Darwin, Northern Australia, January February 2006. The aim of experiment was to observe evolution interaction with environment within an observational framework optimized for a range modeling activities goal improving representation...
[1] Atmospheric fronts in the lower troposphere often mark regions of significant weather and serve as an important conceptual tool that is frequently used well understood by public. This study uses objective method to identify ERA-40 reanalysis compile a quantitative global climatology their occurrence. The confirms mid-latitude storm tracks highest front frequency identifies slow moving frontal boundaries subtropics corresponding major climate features, such Mei-Yu front. also shows be...
Abstract The Transpose-Atmospheric Model Intercomparison Project (AMIP) is an international model intercomparison project in which climate models are run “weather forecast mode.” Transpose-AMIP II experiment alongside phase 5 of the Coupled (CMIP5) and allows processes operating to be evaluated, origin climatological biases explored, by examining evolution from a state large-scale dynamics, temperature, humidity structures constrained through use common analyses. experimental design...
Clouds over the Southern Ocean are often poorly represented by climate models, but they make a significant contribution to top-of-atmosphere (TOA) radiation balance, particularly in shortwave portion of energy spectrum. This study seeks better quantify organization and structure Hemisphere midlatitude clouds combining measurements from active passive satellite-based datasets. Geostationary polar-orbiter satellite data International Satellite Cloud Climatology Project (ISCCP) used...
The representation of tropical convection remains a serious challenge to the skillfulness our weather and climate prediction systems. To address this challenge, World Climate Research Programme (WCRP) Observing System Predictability Experiment (THORPEX) Weather (WWRP) are conducting joint research activity consisting focus period approach along with an integrated framework tailored exploit vast amounts existing observations, expanding computational resources, development new, high-resolution...
An analysis approach that uses the patterns of cloud property joint distributions at mesoscale (cloud type mixtures) from International Satellite Cloud Climatology Project to identify distinct weather states tropical atmosphere is extended whole tropics covering period 1983–2004. These can be used as basis for multi‐scale, multi‐variate compositing other observations understand how systems affect atmospheric diabatic heating and interact with large scale circulation. We illustrate variations...
Abstract A model evaluation approach is proposed in which weather and climate prediction models are analyzed along a Pacific Ocean cross section, from the stratocumulus regions off coast of California, across shallow convection dominated trade winds, to deep ITCZ—the Global Energy Water Cycle Experiment Cloud System Study/Working Group on Numerical Experimentation (GCSS/WGNE) Cross-Section Intercomparison (GPCI). The main goal GPCI evaluate help understand improve representation tropical...
Abstract A comparison of marine cold air outbreaks (MCAOs) in the Northern and Southern Hemispheres is presented, with attention to their seasonality, frequency occurrence, strength as measured by a outbreak index. When considered on gridpoint-by-gridpoint basis, MCAOs are more severe frequent Hemisphere (NH) than (SH) winter. However, when viewed individual events regardless horizontal extent, they occur frequently SH. This fundamentally because NH larger stronger those throughout year, but...
Abstract Conceptually, it is useful to partition the three‐dimensional tropical circulation into meridional and zonal components, namely, Hadley Walker circulations. The averaging involved in their definitions can introduce ambiguities. These problems be circumvented by first partitioning total vertical mass flux components associated with overturning directions, respectively, called here local Defining circulations this way ensures pair of two‐dimensional added give original circulation,...
Abstract A climatology of clouds within marine cold air outbreaks, primarily using long-term satellite observations, is presented. Cloud properties between outbreaks in different regions both hemispheres are compared. In all outbreak tend to be low level with high cloud fraction and low-to-moderate optical thickness. Stronger have that optically thicker, but not geometrically than those weaker outbreaks. There some evidence deepen break up over the course a event. The top-of-the-atmosphere...
Abstract A clustering methodology is applied to cloud optical depth top pressure (TAU-PC) histograms from the new, 1-degree resolution, ISCCP-H dataset, derive an updated global Weather State (WS) dataset. Then, PC-TAU current-climate CMIP6 model simulations are assigned WSs along with their concurrent radiation and precipitation properties, evaluate cloud, radiation, properties in context of States. The new analysis produces that very similar those previously found lower resolution ISCCP-D...
Abstract. To manage Earth in the Anthropocene, new tools, institutions, and forms of international cooperation will be required. Virtualization Engines is proposed as an federation centers excellence to empower all people respond immense urgent challenges posed by climate change.
Abstract Stratospheric humidity analyses produced operationally by the European Centre for Medium‐Range Weather Forecasts (ECMWF) are discussed period since late January 1996 when practice of resetting upperlevel specific to a fixed value at each analysis time was abandoned. Near‐tropopause in reasonable overall agreement with independent observations. Very low humidities occur conjunction deep convection and particularly cold tropopause over equatorial western Pacific during northern...
The mean diurnal cycle of precipitation, near‐surface thermodynamics and surface fluxes from short‐term forecasts the ECMWF model are compared with corresponding observations Large‐Scale Biosphere‐Atmosphere Experiment in Amazonia wet season campaign 1999 Rondônia. Precipitation starts about 2 hours after sunrise model, several earlier than observed, because does not simulate well morning growth nonprecipitating convective boundary layer. However, daily precipitation during compares observed...
Abstract In this third and final paper of a series, we assess the performance three‐dimensional variational data assimilation scheme, in light results from extensive pre‐operational programme numerical experimentation. Its is compared with that previous operational scheme at European Centre for Medium‐Range Weather Forecasts, which was based on Optimal Interpolation. The main features new are illustrated, particular effects non‐separable structure functions improved usage. TIROS‐N...