FATE OF MERCURY IN THE ARCTIC Michael Evan ... - COGCI

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Fate of Mercury in the Arctic 88 highest peak is found in the active layer, though chronologically dating this layer, which is exposed to freeze thaw cycles, cracking and physical transport is not realistic, since this sediment is very cracked and disturbed. The concentration value is however a factor three to four over what is seen in deeper layers. This must be assumed to be due to anthropogenic input. At the very first slice, where there was little green growth, the concentration was as low as values deeper in the core. This core is challenging to analyse, since the common trace metal used for comparison, lead, is found in values under the detection limit in the core. Analyses are being carried out for cadmium to help interpret the signal.
Fate of Mercury in the Arctic 89 Discussion It is important to have reliable RGM concentrations because the RGM levels represent the amount of GEM oxidised and thereafter available for fast deposition from the Arctic troposphere during mercury depletion events, with resultant wash out to the marine environment once the snow melts. We are in need of reliable RGM observations in order to accurately measure flux, verify atmospheric models e.g. DEHM on both a temporal and spatial scale. Experimental data from this work confirms that whether deployed in the laboratory, or the Arctic, the annular denuder method is one that when deployed in accordance with Landis et al., 2002, reproducibly measures the operationally defined RGM with a 15% precision within 3 standard deviations. RGM annular denuder tests Annular denuders were tested under a variety of circumstances to determine how well the denuders could reproduce the same measurement and if they were subject to any passive uptake. The denuders are hand crafted, and are fragile, therefore the denuders are inspected and categorized prior to use. The RGM annular denuder tests performed in Oak Ridge at Station Nord taught many valuable lessons about the operational measurement of reactive gaseous mercury and have raised questions that should be addressed as this method improves. The primary lesson is that RGM measurements are not trivial. In fact they are difficult to perform. They require routine, and strict adherence to protocols to be able to compare them with other data. The blanking, analysis and zeroing of a single denuder takes approximately 1 hour. The results of this work show, that in the future, manual methods for measuring RGM should be performed using triplicate co-located denuder measurements, and the automatic RGM analyser should be deployed when a high-resolution time series is needed.
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Submitted to Atmospheric Environmen
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1. Introduction Mercury in the atmo
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For all flux measurements, heating
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esponse switching valves supplied b
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3.1 RGM flux measurements The resul
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estimating for Alert an average spr
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References 1. Businger J.A. and Onc
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Table captions Table 1. RGM mass ra
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Figure 2. RGM pg m-3 350 300 250 20
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Table 2 DAYHOURMON avg.temp avg.WS
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Fate of Mercury in the Arctic Paper
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FIGURE 1. Schematic diagram of the
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mass flow controller to 10 L/min an
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FIGURE 3. Trends in Hg 0 (upper plo
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FIGURE 6. Trends in several Hg spec
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FIGURE 7. Spatial patterns in month
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(51) Ebinghaus, R.; Kock, H. H.; Te
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The fate of elemental mercury in Ar
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Ozone was measured with an UV absor
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demonstrating that BrO and ClO with
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In the model the removal of GEM lea
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15. Kemp, K. and Wåhlin, P. Applic
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GEM, ng/m 3 Fig 3. GEM against ozon
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Fig. 6 Comparison of measured surfa
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Introduction The perennial oxidatio
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Ariya et al. (11) have shown recent
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Table 1 lists the binding energies
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and a classical densities of states
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The third point demonstrated in Fig
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7. Lamborg, C. H.; Fitzgerald, W.;
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Figure 1. k rec / cm 3 molecule -1
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Asian Chemistry Letters vol. XX, No
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496 M E Goodsite et al. In the pres
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498 M E Goodsite et al. Figure 1 Th
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500 M E Goodsite et al. observed a
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502 M E Goodsite et al. Table 1 14C
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504 M E Goodsite et al. annual reso
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506 M E Goodsite et al. Table 2b Sa
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508 M E Goodsite et al. Going from
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510 M E Goodsite et al. dry mass. T
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512 M E Goodsite et al. Figure 4 Hg
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514 M E Goodsite et al. Koenig B, L
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130 F. Roos-Barraclough et al. / Th
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ABSTRACT Mercury concentrations are
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INTRODUCTION Atmospheric pollution
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and the relative importance of natu
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corresponding to the alkaline igneo
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edges cut off the slices were dried
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Age dating using 14 C Plant macrofo
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espectively (Naucke et al., 1993).
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200 was in the range 1 to 3 :g/m 2
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unpublished data for these paramete
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leachable fraction, and 32.1 µg/g
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indicator of the concentration of a
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caused by the introduction of gasol
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porewaters reveals the influence of
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For example, Hg may become adsorbed
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of the GL profile. Comparison with
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further improve our knowledge of pr
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which are derived from them. In con
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ACKNOWLEDGEMENTS We are grateful to
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Bindler, R. (2003) Estimating the n
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of Southern Denmark. Goodsite, M.E.
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MacKenzie AB, Farmer JG, Sugden CL.
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Schroeder, W.H. and Munthe, J. (199
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Table 1. AMS 14 C dating of plant m
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Table 3. Pb isotope data of leachat
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esidual fractions of the “B” co
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Depth (cm) Depth (cm) a b 0 -10 -20
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Hg accumulation rate (µg/m2/yr) 10
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Depth (cm) a Pb/Zr = UCC Depth (cm)
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Depth (cm) a Depth (cm) b 0 -10 -20
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Depth (cm) Depth (cm) a b 0 -10 -20
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Saturday, 28 December 2002 (Revised
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INTRODUCTION Recent research utiliz
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In addition, the coring system incl
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and testing prior to the Carey Isla
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ACKNOWLEDGEMENTS Development of thi
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Fig. 5. The stainless steel (AISI 3
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Fig. 2. 13
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Fig. 4. 15
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Fig. 6. 17
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FATE OF MERCURY IN THE ARCTIC Michael Evan ... - COGCI

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