g m−2 yr−1),which is slightly lower than that found in mid-continental locations of NorthAmerican (6−12 small mu, Greekg m−2 yr−1). 210Pbanalyses indicate a strong impact of particles on rain Hg concentrations. Particle-phaseHg (range 5-25 fmol m−3; mean 12 ± 1 fmol m−3;66% "reactive") was comparable to values over the Equatorial Pacific. The drydepositional flux is ca. 0.4 nmol m−2 yr−1,or 0.4-1.0% of the wet flux. Particle-phase Hg concentrations did not changesignificantly when African dust was present during sampling. However, the Hg/Alratios were consistent with crustal values during the dust periods. The residencetime of TGM was calculated to be 1.3-3.4 yr in this region, based on standingstock estimates. Incubation of rainwater added to surface seawater gave reductionrates [i.e., production of elemental Hg (Hg°); 1.6-4.3% d of total Hg added]comparable to additions of inorganic ionic standards, indicating that Hg+2 fromprecipitation is reduced in a similar manner in surface waters. Thus, precipitation-phaseHg is generally available for evasion to the atmosphere following depositionto the surface ocean, effectively enhancing the mobility and residence time ofHg at the Earth's surface. " /> THE ATMOSPHERIC CYCLING AND AIR-SEA EXCHANGE OF MERCURY SPECIES IN THE SOUTH AND EQUATORIAL ATLANTIC OCEAN. (R829796) | Science Inventory | US EPA

Science Inventory

Citation:

Lamborg, C. H., K. R. Rolfhus, W. F. Fitzgerald, AND G. Kim. THE ATMOSPHERIC CYCLING AND AIR-SEA EXCHANGE OF MERCURY SPECIES IN THE SOUTH AND EQUATORIAL ATLANTIC OCEAN. (R829796). 46(5):957-977

, (1999).

Record Details:

Record Type: DOCUMENT (JOURNAL/PEER REVIEWED JOURNAL)
Product Published Date: 01/01/1999
Record Last Revised: 12/22/2005