Dry season aerosol iron solubility in tropical northern Australia
MetadataShow full item record
© Author(s) 2016.Marine nitrogen fixation is co-limited by the supply of iron (Fe) and phosphorus in large regions of the global ocean. The deposition of soluble aerosol Fe can initiate nitrogen fixation and trigger toxic algal blooms in nitrate-poor tropical waters. We present dry season soluble Fe data from the Savannah Fires in the Early Dry Season (SAFIRED) campaign in northern Australia that reflects coincident dust and biomass burning sources of soluble aerosol Fe. The mean soluble and total aerosol Fe concentrations were 40 and 500 ng m-3 respectively. Our results show that while biomass burning species may not be a direct source of soluble Fe, biomass burning may substantially enhance the solubility of mineral dust. We observed fractional Fe solubility up to 12% in mixed aerosols. Thus, Fe in dust may be more soluble in the tropics compared to higher latitudes due to higher concentrations of biomass-burning-derived reactive organic species in the atmosphere. In addition, biomass-burning-derived particles can act as a surface for aerosol Fe to bind during atmospheric transport and subsequently be released to the ocean upon deposition. As the aerosol loading is dominated by biomass burning emissions over the tropical waters in the dry season, additions of biomass-burning-derived soluble Fe could have harmful consequences for initiating nitrogen-fixing toxic algal blooms. Future research is required to quantify biomass-burning-derived particle sources of soluble Fe over tropical waters.
Showing items related by title, author, creator and subject.
Biomass burning emissions in north Australia during the early dry season: An overview of the 2014 SAFIRED campaignMallet, M.; Desservettaz, M.; Miljevic, B.; Milic, A.; Ristovski, Z.; Alroe, J.; Cravigan, L.; Rohan Jayaratne, E.; Paton-Walsh, C.; Griffith, D.; Wilson, S.; Kettlewell, G.; Van Der Schoot, M.; Selleck, P.; Reisen, F.; Lawson, S.; Ward, J.; Harnwell, J.; Cheng, M.; Gillett, R.; Molloy, S.; Howard, D.; Nelson, P.; Morrison, A.; Edwards, G.; Williams, A.; Chambers, S.; Werczynski, S.; Williams, L.; Winton, Victoria; Atkinson, B.; Wang, X.; Keywood, M. (2017)© 2017 Author(s). The SAFIRED (Savannah Fires in the Early Dry Season) campaign took place from 29 May until 30 June 2014 at the Australian Tropical Atmospheric Research Station (ATARS) in the Northern Territory, Australia. ...
The effects of different cutting heights, mulching and burning on the control of bellyache bush (jatropha gossypifolia L.) applicable in East TimorGuterres, Acacio da Costa (2008)Since bellyache bush invaded to East Timor it has significantly reduced crop and animal production and consequential loss of income from farm enterprises. Methods of control of bellyache bush chosen should be appropriate ...
Korczynskyj, Dylan (2002)Australian grasstrees are a long-lived group of arborescent, monocotyledonous plants that persist in fire-prone landscapes. Renowned for their capacity to survive fire, and flower soon after, these species have long ...