Mineral particle size as a control on aerosol iron solubility
Mineral particle size as a control on aerosol iron solubility
复制标题
DOI：
10.1029/2006gl026557
复制
发表时间：
2006-09-12
影响因子：
5.2
通讯作者：
Jickells, T. D.
中科院分区：
文献类型：
--
作者：
Baker, A. R.;Jickells, T. D.
气溶胶铁的溶解度是全球铁的生物地球化学循环中的一个主要不确定性，通过它对海洋生产力的影响，碳循环及其对全球气候的影响。以前的研究已经报道了这种溶解度的很大不同的值(0.01-80%)。在这里，我们表明，控制气溶胶铁溶解度的主要因素是矿物气溶胶颗粒的比表面积与体积比，在大气传输过程中，由于较大颗粒的优先去除(假设颗粒形态随颗粒大小相对恒定)，随着矿物气溶胶浓度的降低，该比表面积与体积比发生变化。这一重要结果表明，气溶胶铁的溶解度不是固定不变的，而是在空间和时间尺度(如冰川间冰期)上作为尘埃浓度的反函数而发生可预测的变化。
Aerosol iron solubility is a major uncertainty in the global biogeochemical cycle of iron and, via its impact on ocean productivity, the carbon cycle and their influence on global climate. Previous studies have reported widely different values for this solubility (0.01 - 80%). Here we show that the primary control on aerosol iron solubility is the surface area to volume ratio of mineral aerosol particles, which changes during atmospheric transport as mineral aerosol concentration decreases due to preferential removal of larger particles ( assuming particle morphology to be relatively constant with particle size). This important result indicates that aerosol iron solubility is not fixed, but will change predictably as an inverse function of dust concentration on both spatial and temporal (e.g. glacial interglacial) scales.