Show simple item record

dc.contributor.authorSholkovitz, Edward R.
dc.contributor.authorSedwick, Peter N.
dc.contributor.authorChurch, Thomas M.
dc.contributor.authorBaker, Alexander R.
dc.contributor.authorPowell, Claire F.
dc.date.accessioned2012-03-26T20:29:16Z
dc.date.available2012-03-26T20:29:16Z
dc.date.issued2012-03-26
dc.identifier.urihttp://hdl.handle.net/1912/5104
dc.description.abstractAerosol deposition provides a major input of the essential micronutrient iron to the open ocean. A critical parameter with respect to biological availability is the proportion of aerosol iron that enters the oceanic dissolved iron pool – the so-called fractional solubility of aerosol iron (%FeS). Here we present a global-scale compilation of total aerosol iron loading (FeT) and estimated %FeS values for ~1100 samples collected over the open ocean, the coastal ocean, and some continental sites, including a new data set from the Atlantic Ocean. Despite the wide variety of methods that have been used to define 'soluble' aerosol iron, our global-scale compilation reveals a remarkably consistent trend in the fractional solubility of aerosol iron as a function of total aerosol iron loading, with the great bulk of the data defining an hyperbolic trend. The hyperbolic trends that we observe for both global- and regional-scale data are adequately described by a simple two-component mixing model, whereby the fractional solubility of iron in the bulk aerosol reflects the conservative mixing of 'lithogenic' mineral dust (high FeT and low %FeS) and non-lithogenic 'combustion' aerosols (low FeT and high %FeS). An increasing body of empirical and model-based evidence points to anthropogenic fuel combustion as the major source of these non-lithogenic 'combustion' aerosols, implying that human emissions are a major determinant of the fractional solubility of iron in marine aerosols. The robust global-scale relationship between %FeS and FeT provides a simple heuristic method for estimating aerosol iron solubility at the regional to global scale.en_US
dc.format.mimetypeapplication/msword
dc.format.mimetypeapplication/vnd.ms-excel
dc.format.mimetypeapplication/pdf
dc.relation.ispartofhttp://hdl.handle.net/1912/5197
dc.relation.replaceshttp://hdl.handle.net/1912/4843
dc.titleFractional solubility of aerosol iron : synthesis of a global-scale data set [revised]en_US
dc.typeDataseten_US
dc.identifier.doi10.1575/1912/5104


Files in this item

Thumbnail
Thumbnail
Thumbnail
Thumbnail
Thumbnail

This item appears in the following Collection(s)

Show simple item record