Aeolian iron input to the ocean through precipitation scavenging: A modeling perspective and its implication for natural iron fertilization in the ocean

[1] Aeolian dust input may be a critical source of dissolved iron for phytoplankton growth in some oceanic regions. We used an atmospheric general circulation model (GCM) to simulate dust transport and removal by dry and wet deposition. Model results show extremely low dust concentrations over the equatorial Pacific and Southern Ocean. We find that wet deposition through precipitation scavenging accounts for ∼40% of the total deposition over the coastal oceans and ∼60% over the open ocean. Our estimates suggest that the annual input of dissolved Fe by precipitation scavenging ranges from 0.5 to 4 × 1012 g yr−1, which is 4–30% of the total aeolian Fe fluxes. Dissolved Fe input through dry deposition is significantly lower than that by wet deposition, accounting for only 0.6–2.4 % of the total Fe deposition. Our upper limit estimate on the fraction of dissolved Fe in the total atmospheric deposition is thus more than three times higher than the value of 10% currently considered as an upper limit for dissolved Fe in Aeolian fluxes. As iron input through precipitation may promote episodic phytoplankton growth in the ocean, measurements of dissolved iron in rainwater over the oceans are needed for the study of oceanic biogeochemical cycles.

[1]  V. Ramaswamy,et al.  A general circulation model study of the global carbonaceous aerosol distribution , 2002 .

[2]  S. Eisenreich,et al.  Characterization of atmospheric trace elements on PM2.5 particulate matter over the New York-New Jersey harbor estuary , 2002 .

[3]  O. Torres,et al.  ENVIRONMENTAL CHARACTERIZATION OF GLOBAL SOURCES OF ATMOSPHERIC SOIL DUST IDENTIFIED WITH THE NIMBUS 7 TOTAL OZONE MAPPING SPECTROMETER (TOMS) ABSORBING AEROSOL PRODUCT , 2002 .

[4]  Y. Gaoa,et al.  Characterization of atmospheric trace elements on PM 2 . 5 particulate matter over the New York – New Jersey harbor estuary , 2002 .

[5]  D. Turner,et al.  The Biogeochemistry of Iron in Seawater , 2001 .

[6]  M. Chin,et al.  Sources and distributions of dust aerosols simulated with the GOCART model , 2001 .

[7]  A. Saydam,et al.  Iron Speciation in Precipitation in the North-Eastern Mediterranean and Its Relationship with Sahara Dust , 2001 .

[8]  G. Carmichael,et al.  Heterogeneous reactions of NO2 and HNO3 on oxides and mineral dust: A combined laboratory and modeling study , 2001 .

[9]  E. Boyle,et al.  Soluble and Colloidal Iron in the Oligotrophic North Atlantic and North Pacific , 2001, Science.

[10]  T. Jickells,et al.  Atmospheric iron inputs to the oceans , 2001 .

[11]  P. Falkowski,et al.  Seasonal distributions of aeolian iron fluxes to the global ocean , 2001 .

[12]  Andrew J. Watson,et al.  A mesoscale phytoplankton bloom in the polar Southern Ocean stimulated by iron fertilization , 2000, Nature.

[13]  S. Skrabal,et al.  Temporal Variability of Iron Speciation in Coastal Rainwater , 2000 .

[14]  C. Corselli,et al.  Recent terrestrial and carbonate fluxes in the pelagic eastern Mediterranean; a comparison between sediment trap and surface sediment , 2000 .

[15]  S. Doney,et al.  Iron supply and demand in the upper ocean , 2000 .

[16]  K. Johnson,et al.  A model of the iron cycle in the ocean , 2000 .

[17]  Wolfgang Baumjohann,et al.  Substorm expansion onset mechanism debated , 2000 .

[18]  G. McTainsh Dust Transport and Deposition , 2000 .

[19]  T. Jickells The inputs of dust derived elements to the Sargasso Sea; a synthesis , 1999 .

[20]  Guebuem Kim,et al.  Atmospheric depositional fluxes of trace elements, 210Pb, and 7Be to the Sargasso Sea , 1999 .

[21]  Y. Balkanski,et al.  Modeling the mineralogy of atmospheric dust sources , 1999 .

[22]  T. Cahill,et al.  Long-range transport of anthropogenic aerosols to the National Oceanic and Atmospheric Administration baseline station at Mauna Loa Observatory, Hawaii , 1999 .

[23]  P. Pease,et al.  Aerosols over the Arabian Sea: Atmospheric transport pathways and concentrations of dust and sea salt , 1999 .

[24]  J. Pailleux,et al.  Variational surface analysis from screen level atmospheric parameters , 1999 .

[25]  Sandy P. Harrison,et al.  Dust sources and deposition during the last glacial maximum and current climate: A comparison of model results with paleodata from ice cores and marine sediments , 1999 .

[26]  J. Prospero Long‐term measurements of the transport of African mineral dust to the southeastern United States: Implications for regional air quality , 1999 .

[27]  J. Jouzel,et al.  Climate and atmospheric history of the past 420,000 years from the Vostok ice core, Antarctica , 1999, Nature.

[28]  Irina N. Sokolik,et al.  Incorporation of mineralogical composition into models of the radiative properties of mineral aerosol from UV to IR wavelengths , 1999 .

[29]  A. Watson,et al.  The sensitivity of atmospheric CO2 concentrations to input of iron to the oceans , 1999 .

[30]  A. Johansen,et al.  Chemical characterization of ambient aerosol collected during the southwest monsoon and intermonsoon seasons over the Arabian Sea: Labile-Fe(II) and other trace metals , 1999 .

[31]  I. Tegen,et al.  A general circulation model study on the interannual variability of soil dust aerosol , 1998 .

[32]  J. King,et al.  The effect of source area and atmospheric transport on mineral aerosol collected over the North Pacific Ocean , 1998 .

[33]  Wallace S. Broecker,et al.  The sequence of events surrounding Termination II and their implications for the cause of glacial‐interglacial CO2 changes , 1998 .

[34]  Grant Harvey McTainsh,et al.  Climatic controls upon dust storm occurrence in eastern Australia , 1998 .

[35]  J. Prospero,et al.  Diel variability of soluble Fe(II) and soluble total Fe in North African dust in the trade winds at Barbados , 1997 .

[36]  Larry L. Stowe,et al.  Characterization of tropospheric aerosols over the oceans with the NOAA advanced very high resolution radiometer optical thickness operational product , 1997 .

[37]  R. Duce,et al.  Mass‐particle size distributions of atmospheric dust and the dry deposition of dust to the remote ocean , 1997 .

[38]  Edward J. Carpenter,et al.  Trichodesmium, a Globally Significant Marine Cyanobacterium , 1997 .

[39]  Paul G. Falkowski,et al.  Evolution of the nitrogen cycle and its influence on the biological sequestration of CO2 in the ocean , 1997, Nature.

[40]  Xiaoye Zhang,et al.  Temporal and spatial distributions of dust and its deposition to the China Sea , 1997 .

[41]  J. Mateu,et al.  Atmospheric input of dissolved and particulate metals to the northwestern Mediterranean , 1997 .

[42]  J. Lelieveld,et al.  Role of mineral aerosol as a reactive surface in the global troposphere , 1996 .

[43]  Raphael Kudela,et al.  A massive phytoplankton bloom induced by an ecosystem-scale iron fertilization experiment in the equatorial Pacific Ocean , 1996, Nature.

[44]  K. Johnson,et al.  Control of community growth and export production by upwelled iron in the equatorial Pacific Ocean , 1996, Nature.

[45]  V. Ittekkot Particle flux in the ocean , 1996 .

[46]  R. Chester,et al.  The impact of desert dust across the Mediterranean , 1996 .

[47]  J. Prospero Saharan Dust Transport Over the North Atlantic Ocean and Mediterranean: An Overview , 1996 .

[48]  G. Zhuang,et al.  Iron(II) in rainwater, snow, and surface seawater from a coastal environment , 1995 .

[49]  David K. Rea,et al.  Grain size distribution and depositional processes of the mineral component of abyssal sediments: Lessons from the North Pacific , 1995 .

[50]  R. Duce,et al.  Trace elements in the atmosphere over the North Atlantic , 1995 .

[51]  R. Wilson,et al.  Climatology of the SKYHI Troposphere–Stratosphere–Mesosphere General Circulation Model , 1995 .

[52]  T. Jickells,et al.  Factors controlling the solubility of aerosol trace metals in the atmosphere and on mixing into seawater , 1995 .

[53]  N. M. Price,et al.  Iron chemistry in seawater and its relationship to phytoplankton: a workshop report , 1995 .

[54]  I. Fung,et al.  Modeling of mineral dust in the atmosphere: Sources, transport, and optical thickness , 1994 .

[55]  A. J. Watson,et al.  Testing the iron hypothesis in ecosystems of the equatorial Pacific Ocean , 1994, Nature.

[56]  J. Pinto,et al.  Transport, radiative, and dynamical effects of the antarctic ozone hole: A GFDL SKYHI' model experiment , 1994 .

[57]  W. C. Graustein,et al.  Transport and residence times of tropospheric aerosols inferred from a global three-dimensional simulation of 210Pb , 1993 .

[58]  Albert A. M. Holtslag,et al.  Local Versus Nonlocal Boundary-Layer Diffusion in a Global Climate Model , 1993 .

[59]  B. Faust,et al.  Photochemistry of aqueous iron(III)-polycarboxylate complexes : roles in the chemistry of atmospheric and surface waters , 1993 .

[60]  S. Guerzoni,et al.  Contribution of Saharan dust to the Central Mediterranean Basin , 1993 .

[61]  C. Genthon,et al.  Simulations of desert dust and sea-salt aerosols in Antarctica with a general circulation model of the atmosphere , 1992 .

[62]  R. Duce,et al.  Chemistry of iron in marine aerosols , 1992 .

[63]  J. Galloway,et al.  Episodic atmospheric nitrogen deposition to oligotrophic oceans , 1992, Nature.

[64]  S. Joussaume,et al.  Comments on the origin of dust in East Antarctica for present and ice age conditions , 1992 .

[65]  Robert A. Duce,et al.  Link between iron and sulphur cycles suggested by detection of Fe(n) in remote marine aerosols , 1992, Nature.

[66]  R. Duce,et al.  Atmospheric transport of iron and its deposition in the ocean , 1991 .

[67]  K. Lieser,et al.  Transition metals in atmospheric aqueous samples, analytical determination and speciation , 1991 .

[68]  R. Feely,et al.  Atmospheric iron inputs and primary productivity: Phytoplankton responses in the North Pacific , 1991 .

[69]  L. Sigg,et al.  Evidence for redox cycling of iron in atmospheric water droplets , 1990, Nature.

[70]  John H. Martin glacial-interglacial Co2 change : the iron hypothesis , 1990 .

[71]  B. Faust,et al.  Photolysis of Fe (III)-hydroxy complexes as sources of OH radicals in clouds, fog and rain , 1990 .

[72]  J. Gros,et al.  Solubility of major species in precipitation: Factors of variation , 1990 .

[73]  M. Sarnthein,et al.  Paleoclimatology and paleometeorology : modern and past patterns of global atmospheric transport , 1989 .

[74]  M. Desbois,et al.  Present Transport and Deposition Patterns of African Dusts to the North-Western Mediterranean , 1989 .

[75]  B. Hicks,et al.  A preliminary multiple resistance routine for deriving dry deposition velocities from measured quantities , 1987 .

[76]  H. Levy,et al.  Fate of US and Canadian combustion nitrogen emissions , 1987, Nature.

[77]  William L. Chameides,et al.  Rainout lifetimes of highly soluble aerosols and gases as inferred from simulations with a general circulation model , 1986 .

[78]  M. L. Mandich,et al.  Speciation, photosensitivity, and reactions of transition metal ions in atmospheric droplets , 1986 .

[79]  M. Uematsu,et al.  Seasonal and areal variation of continental aerosol in the surface air over the western North Pacific region , 1985 .

[80]  J. Prospero,et al.  Deposition of atmospheric mineral particles in the North Pacific Ocean , 1985 .

[81]  S. Taylor The continental crust , 1985 .

[82]  S. Taylor,et al.  The continental crust: Its composition and evolution , 1985 .

[83]  Joseph M. Prospero,et al.  Transport of mineral aerosol from Asia Over the North Pacific Ocean , 1983 .

[84]  J. Galloway,et al.  Trace metals in atmospheric deposition: A review and assessment , 1982 .

[85]  J. Prospero,et al.  Atmospheric transport of soil dust from Africa to South America , 1981, Nature.

[86]  W. Moxim,et al.  Tracer simulation using a global general circulation model: Results from a midlatitude instantaneous source experiment , 1978 .

[87]  J. Hales,et al.  Statistical aspects of the washout of polydisperse aerosols , 1976 .

[88]  J. Prospero,et al.  Continental dust in the atmosphere of the Eastern Equatorial Pacific , 1969 .