Biomass-burning aerosol over northern Australia

Radhi, M.; Box, Michael A.; Box, G. P.; Mitchell, Rosalind

doi:10.22499/2.6201.003

Cited by 10 publications

(5 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…October , the particle diameter increased to the range of 100-200 nm, which may have been the result of aging processes of biomass-burning aerosols, mixed with additional marine aerosols. This tendency is consistent with Australia's biomass-burning aerosol averaged size of 110 nm (Radhi et al, 2012;Milic et al, 2017).…”

Section: Size Distributionsupporting

confidence: 81%

Characterization of aerosols over the Great Barrier Reef: The influence of transported continental sources

Chen

Schofield

Rayner

et al. 2019

Science of The Total Environment

View full text Add to dashboard Cite

The rapid environmental changes in Australia prompt a more thorough investigation of the influence of transportation, local emissions, and optical-chemical properties on aerosol production across the region. A month-long intensive measurement campaign was conducted during spring 2016 at Mission Beach, a remote coastal site west of the Great Barrier Reef (GBR) on the northeast coast of Australia. One aerosol pollution episode was investigated in early October. This event was governed by meteorological conditions and characterized by the increase in black carbon (BC) mass concentration (averaged value of 0.35±0.20  gm-3). Under the 2 influence of the continental transportation, a new layer of nucleation-mode aerosols with an initial size diameter of 20 nm was observed and aerosol number concentrations reached the peak of 6733 cm-3 at a diameter of 29 nm. The averaged aerosol extinction coefficient at the height of 2 km was 150 Mm-1 , with a small depolarized ratio (3.5-5%). Simultaneously, the boundary layer height presented a fall-rise trend in the presence of these enhanced aerosol concentrations and became stable in a later stage of the episode. We did not observe clear boundary layer height diurnal variations from the LiDAR observations or from the Weather Research and Forecasting (WRF) model outputs, except in an earlier stage of the aerosol episode for the former. Although the sea breeze may have been responsible for these particles, on the balance of available data, we suggest that the aerosol properties at the GBR surface during this period are more likely influenced by regional transportation of continental sources, including biomass-burning aerosols.

show abstract

Section: Size Distributionsupporting

confidence: 81%

Characterization of aerosols over the Great Barrier Reef: The influence of transported continental sources

Chen

Schofield

Rayner

et al. 2019

Science of The Total Environment

View full text Add to dashboard Cite

show abstract

“…Beginning 7 October, the particle diameter increased to the range of 100-200 nm, which may have been the result of aging processes of biomass-burning aerosols, mixed with additional marine aerosols. This tendency is consistent with Australia's biomass-burning aerosol averaged size of 110 nm (Radhi et al, 2012;Milic et al, 2017).…”

Section: Size Distributionsupporting

confidence: 81%

Author comments to Reviewer #1 (Dr. Zoltan Sylvester)

Ding¹

2019

Preprint

View full text Add to dashboard Cite

The sedimentary architecture at continental margins reflects the interplay between the rate of change of accommodation creation (δA) and the rate of change of sediment supply (δS). Stratigraphic interpretation increasingly focuses on understanding the link between deposition patterns and changes in δA=δS, with an attempt to reconstruct the contributing factors. Here, we use the landscape modelling code pyBadlands to (1) investigate the development of stratigraphic sequences in a source-to-sink context; (2) assess the respective performance of two well-established stratigraphic interpretation techniques: the trajectory analysis method and the accommodation succession method; and (3) propose quantitative stratigraphic interpretations based on those two techniques. In contrast to most stratigraphic forward models (SFMs), pyBadlands provides selfconsistent sediment supply to basin margins as it simulates erosion, sediment transport and deposition in a source-to-sink context. We present a generic case of landscape evolution that takes into account periodic sea level variations and passive margin thermal subsidence over 30 million years, under uniform rainfall. A set of post-processing tools are provided to analyse the predicted stratigraphic architecture. We first reconstruct the temporal evolution of the depositional cycles and identify key stratigraphic surfaces based on observations of stratal geometries and facies relationships, which we use for comparison to stratigraphic interpretations. We then apply both the trajectory analysis and the accommodation succession methods to manually map key stratigraphic surfaces and define sequence units on the final model output. Finally, we calculate shoreline and shelf-edge trajectories, the temporal evolution of changes in relative sea level (proxy for δA) and sedimentation rate (proxy for δS) at the shoreline, and automatically produce stratigraphic interpretations. Our results suggest that the analysis of the presented model is more robust with the accommodation succession method than with the trajectory analysis method. Stratigraphic analysis based on manually extracted shoreline and shelf-edge trajectory requires calibrations of time-dependent processes such as thermal subsidence or additional constraints from stratal terminations to obtain reliable interpretations. The 3-D stratigraphic analysis of the presented model reveals small lateral variations of sequence formations. Our work provides an efficient and flexible quantitative sequence stratigraphic framework to evaluate the main drivers (climate, sea level and tectonics) controlling sedimentary architectures and investigate their respective roles in sedimentary basin development.

show abstract

“…[] and Bouya and Box [] analyzed data from Bureau and TWP/ARM photometers to delineate the seasonal characteristics of the aerosol at Darwin, while Radhi et al . [] applied a similar technique to the data from the CSIRO stations at Lake Argyle and Jabiru. Both studies identified the large increase in smoke aerosol toward the end of the dry season (October) with evidence for coarse mode sea‐salt aerosol during the wet season, more prominent at Darwin as expected given its coastal location.…”

Section: Introductionmentioning

confidence: 99%

The climatology of Australian tropical aerosol: Evidence for regional correlation

Mitchell

Forgan

Campbell

et al. 2013

Geophysical Research Letters

View full text Add to dashboard Cite

[1] Biomass burning aerosols from the tropical savanna of Northern Australia constitute a globally significant aerosol source, with impacts on regional climate and air quality. Knowledge of the seasonal cycle and spatial distribution of this aerosol is required for its realistic representation in models of global climate, and to help define the role of this region in the global carbon cycle. This paper presents a decadal climatology of these aerosols, based on Sun photometer records from three stations in the Australian tropics, over the period 1998-2012. The monthly time series shows enhanced aerosol emissions following prodigious wet seasons, two of which occurred during the study period. The monthly climatology shows the expected peak during the late dry season (September-November), when most burning takes place, with clear evidence of the dominant modulating effect of fine-particle smoke emission apparent from the annual cycle of the Ångström exponent, a proxy for particle size. The aerosol levels during the early dry season are higher at the northern "Top End" stations than at the south-westerly Kimberley station. The time variation of aerosol optical depth is highly correlated between all three station pairs, with a correlation coefficient r 2 > 0.75 at monthly resolution between all pairs. This high correlation between widely separated stations declines only gradually as the filtering interval is reduced, suggesting remarkably high coherence in the emission and transport of biomass burning aerosol across the entire region.

show abstract

Biomass-burning aerosol over northern Australia

Cited by 10 publications

References 38 publications

Characterization of aerosols over the Great Barrier Reef: The influence of transported continental sources

Characterization of aerosols over the Great Barrier Reef: The influence of transported continental sources

Author comments to Reviewer #1 (Dr. Zoltan Sylvester)

The climatology of Australian tropical aerosol: Evidence for regional correlation

Contact Info

Product

Resources

About