A5073199789- Atmospheric aerosols and clouds
- Atmospheric Ozone and Climate
- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Calibration and Measurement Techniques
- Fire effects on ecosystems
- Aeolian processes and effects
- Geology and Paleoclimatology Research
- Remote Sensing in Agriculture
- Rangeland and Wildlife Management
- Radioactive contamination and transfer
- Geochemistry and Geologic Mapping
- Soil Geostatistics and Mapping
- Spectroscopy and Laser Applications
- Climate variability and models
- Marine animal studies overview
- Air Quality Monitoring and Forecasting
- Urban Heat Island Mitigation
- Spectroscopy and Chemometric Analyses
- Meteorological Phenomena and Simulations
- Crustacean biology and ecology
- Smart Agriculture and AI
- Tropical and Extratropical Cyclones Research
- Marine and coastal ecosystems
- Species Distribution and Climate Change
Met Office
2023
CSIRO Oceans and Atmosphere
1994-2017
Commonwealth Scientific and Industrial Research Organisation
1998-2015
Bureau of Meteorology
2008-2010
Collaboration for Australian Weather and Climate Research
2008
University of Birmingham
2006
NOAA National Environmental Satellite Data and Information Service
1996
NOAA Center for Satellite Applications and Research
1996
Westinghouse Electric (United States)
1991
This paper presents the results and satellite intercomparisons for retrieval of aerosol optical depth (AOD) land surface bidirectional reflectance using Multiangle Advanced Along-Track Scanning Radiometer (AATSR). The algorithm developed is based on inversion a physical model light scattering that requires no priori knowledge surface. evaluated number sites around world to test its operation over range types covers including dark bright surfaces. Validation performed Aerosol Robotic Network...
Abstract. Classification of Australian continental aerosol types resulting from episodes enhanced source activity, such as smoke plumes and dust outbreaks, is carried out via cluster analysis optical properties obtained inversion sky radiance distributions at ground stations using data over the last decade. The distinguishes four significant classes, which are identified on basis their provenance determined by satellite imagery back-trajectory analysis. classes respectively aged smoke, fresh...
Abstract The Earth’s surface comprises minerals diagnostic of weathering, deposition and erosion. first continental-scale mineral maps generated from an imaging satellite with spectral bands designed to measure clays, quartz other were released in 2012 for Australia. Here we show how these improve our understanding erosional depositional processes the context changing weather, climate tectonics. clay composition map shows kaolinite has developed over tectonically stable continental crust...
This paper examines the feasibility of remotely sensing cloud-top pressure from observations reflected sunlight at frequencies in A band absorption oxygen (13 070 cm−1, 765 nm). The data are assumed to consist several channels within and one reference channel outside band. principal difficulty is that radiance attenuated by O2 not only atmosphere above cloud, but also along photon trajectories cloud. extent extra unknown a priori because microphysics structure cloud unknown. investigates...
Abstract. Collocated sun photometer and nephelometer measurements at Tinga Tingana in the Australian Outback over decade 1997–2007 show a significant increase aerosol loading following onset of severe drought conditions 2002. This is confined to season dust activity, particularly September March. In contrast, background levels during May, June July remained stable. The enhanced loadings latter 5 years study period can be understood as combination dune destabilisation through loss ephemeral...
This paper proposes a feedback mechanism which modifies the enhancement of cloud top albedo expected from an increased concentration condensation nuclei (CCN). The is based on thermodynamic tendency to stabilize itself against changes in absorption solar radiation. For optically thin clouds, this leads reduction anticipated enhancement, while for thick amplification predicted. likely impact effect radiative forcing climate due CCN and hence discussed.
The low background aerosol loadings prevailing over much of the Australian continent necessitate careful attention to calibration sun photometers. validity such calibrations can only be assessed objectively by intercomparison independent systems operating side side. This paper documents two intercomparisons: first between three dissimilar photometers collocated at Alice Springs using methods, and second identical sited Tinga Tingana in Strzelecki Desert South Australia. total optical depth...
Abstract. Mineral dust is one of the major components world's aerosol mix, having a number impacts within Earth system. However, climate forcing impact mineral currently poorly constrained, with even its sign uncertain. As Australian deserts are more reddish than those in Northern Hemisphere, it important to better understand physical, chemical and optical properties this aerosol. We have investigated desert at site SW Queensland, which strongly influenced by both biomass burning Three years...
The extensive fires in southeastern Australia January 2003 culminated the Canberra firestorm of 18 January. generated a pall smoke that blanketed area for following week and affected region most month. Analysis Sun photometer data shows aerosol optical depths τ 500 > 7 were observed during firestorm. During subsequent month dispersed, although background conditions (τ < 0.1) did not return until after significant rain late February. properties retrieved from sky radiance scans...
Abstract The use of dense dark vegetation (DDV) for atmospheric aerosol correction Landsat imagery is investigated Australian conditions. Aerosol optical depth (AOD) measurements from sun photometers are used as a reference data set and compared against estimates AOD derived using the DDV method. method makes assumptions that sufficiently ratio between bottom-of-atmosphere reflectances at different wavelengths constant. These were tested Landsat-5 Thematic Mapper (TM) corrected with measured...
Abstract. Airborne particles or aerosols have long been recognised for their major contribution to uncertainty in climate change. In addition, aerosol amounts must be known accurate atmospheric correction of remotely sensed images, and are required accurately gauge the available solar resource. However, despite great advances surface networks satellite retrievals over recent years, long-term continental-scale data sets lacking. Here we present an assessment Australia based on combined sun...
Airborne experiments to assess the feasibility of remote sensing surface pressure from a space platform are described. The data high-resolution spectra in O2 A band (759–771 nm) sunlight reflected sea surface, measured by grating spectrograph directed toward sunglint research aircraft. It is shown that first approximation radiance function just one variable, adjusted air mass, defined terms geometrical factors, pressure, altitude aircraft, and an estimate mean temperature lower atmosphere....
We have observed strong correlations between simultaneous and co‐located measurements of aerosol optical depth column amounts carbon monoxide, hydrogen cyanide, formaldehyde ammonia in bushfire smoke plumes over SE Australia during the Austral summers 2001/2002 2002/2003. show how satellite‐derived maps may be used conjunction with these to determine total gases present a fire‐affected region. This provides basis method for estimating emissions trace from biomass burning episodes using...
This paper investigates the feasibility of satellite remote sensing surface pressure using radiometric measurements in oxygen A band. It is shown out primary sources error are uncertainties temperature profile, reflection coefficient, and aerosol loading. The impact each these errors upon estimated. Pressure to better than 2 hPa accuracy appear possible principle over a wide range reflectances if profile known an 1 K, loading 10%, instrumental noise can be limited 0.1%. However, calculations...
We present a new algorithm that simultaneously retrieves aerosol properties and land surface bidirectional reflectance distribution function (BRDF) over Australian from Advanced Along-Track Scanning Radiometer images. Three key components are addressed: (1) an analytical radiative transfer formulation, based on Green's function, linking top-of-atmosphere (TOA) to the BRDF; (2) novel approach modeling BRDF using extended compositing period; (3) set of representative models published typology...
Abstract Images obtained from two NOAA/AVHRR overpasses of Macquarie Island in October 1985 show pronounced cloud bands associated with trapped lee waves. One image reveals striking evidence an abrupt change the propagating wave mode. structure and evolution waves is interpreted using a linear wave‐model coupled radiosonde data island. model successfully forecasts mode change, accurately predicts wavelengths. interpretation difference between amplitudes modes also provided. Infrared channel...
Environmental contextMineral dust aerosol is both an efficient scatterer of solar radiation, potentially cooling the planet, and a moderate absorber, warming it: exact balance uncertain, geographically variable. Australian desert soils are noticeably more reddish than most Northern Hemisphere deserts, probably result enhanced iron mineralogy. This paper contains results from field campaign designed to increase our understanding chemistry mineral aerosol, especially in relation salt....
RÉSUMÉOn discute de la nécessité déterminer des cibles brillantes d'étalonnage sur le continent australien en fonction leur rôle potentiel dans une variété d'activités télédétection dont l'étalonnage radiométrique capteurs et validation produits dérivés, principalement l'épaisseur optique aérosols réflectance surface. Les critères sélection pour tels sites font appel à brillance, stabilité temporelle spectrale, l'homogénéité spatiale. On compare plusieurs potentiels utilisant ces association...