当前位置: X-MOL 学术Atmos. Environ. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Origin, transport and deposition of aerosol iron to Australian coastal waters
Atmospheric Environment ( IF 5 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.atmosenv.2020.117432
Morgane M.G. Perron , Bernadette C. Proemse , Michal Strzelec , Melanie Gault-Ringold , Philip W. Boyd , Estrella Sanz Rodriguez , Brett Paull , Andrew R. Bowie

Australia is a major source of Fe-laden dust to the anemic marine phytoplankton in the Southern Ocean and to Southern Hemisphere (SH) low latitudes diazotrophic bacteria. However, the paucity of observations and laboratory experiments on SH aerosols biases model predictions of atmospheric Fe deposition to the southern oceans and the subsequent response of ocean productivity. As a result of an extensive shipboard aerosol sampling effort, this study presents laboratory measurements of aerosol Fe concentrations, solubilities and fluxes and analysis of chemical tracers, highlighting the large heterogeneity between aerosol Fe sources in 5 coastal regions around Australia. While dust-sourced high Fe loadings and low Fe solubilities (5%) aerosols dominate the atmospheric burden of the western coasts of Australia, much lower Fe concentrations but greater Fe solubilities (10.5% and 13%) were measured in aerosols along the east coast which was attributed to solubility-enhancing atmospheric reactions with anthropogenic pollutants. Surprisingly high aerosol Fe solubilities (>20%) in northern Australia aerosols were associated with direct emissions or atmospheric reactions with bushfire emissions at tropical latitudes, which accounted for 49% of the total (sum) atmospheric dry deposition flux of labile Fe measured across the continent's surrounding seawaters in this study.

中文翻译:

气溶胶铁在澳大利亚沿海水域的起源、运输和沉积

澳大利亚是南大洋贫血海洋浮游植物和南半球 (SH) 低纬度固氮细菌的含铁尘埃的主要来源。然而,由于缺乏对 SH 气溶胶的观测和实验室实验,对大气铁沉积到南部海洋的模型预测以及随后的海洋生产力响应存在偏差。作为广泛的船上气溶胶采样工作的结果,本研究展示了气溶胶 Fe 浓度、溶解度和通量的实验室测量值以及化学示踪剂的分析,突出了澳大利亚 5 个沿海地区气溶胶 Fe 源之间的巨大异质性。虽然粉尘来源的高铁含量和低铁溶解度 (5%) 气溶胶在澳大利亚西海岸的大气负担中占主导地位,在东海岸的气溶胶中测得的 Fe 浓度低得多,但 Fe 溶解度更高(10.5% 和 13%),这归因于与人为污染物增加溶解度的大气反应。澳大利亚北部气溶胶中令人惊讶的高气溶胶 Fe 溶解度 (>20%) 与热带纬度的森林火灾排放的直接排放或大气反应有关,占整个地区测量的不稳定 Fe 大气干沉降通量的 49%。在这项研究中大陆周围的海水。
更新日期:2020-05-01
down
wechat
bug