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

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Fate of Mercury in the Arctic 86 Figure 20. Preliminary mercury accumulation rate on the Faroe Islands. Unpublished data (manuscript in preparation by Shotyk, Goodsite et al). a. is the total profile, b looks in detail at the deeper depths. The arrows denote discrete ash layers, deposited from eruptions from nearby Icelandic volcanoes. c. is the uppermost 15 cm of the profile with the background value plotted for comparison purposes Dates determined by 210-Pb constant rate of supply model. The mercury accumulation rate cannot achieve the same detail, given the fact that a dating model is used and the peat is so compact and dense that a one-centimetre slice may represent 5 to 10 years of growth already towards the top of the profile. Never the less, the same trend is observed, with mercury accumulation peaking approximately 20 years ago, and since falling. The back ground accumulation rate of approximately 1 µg m -2 yr -1 is approximately the same as that found in southern Greenland and Denmark. The total loading, that is, the total amount of mercury considered with the number of years of sedimentation is not higher than the other two locations studied, though on initial inspection, one notes very high concentrations, and an accumulation rate over 30 times higher than background.
Fate of Mercury in the Arctic 87 Total Hg ng/g (freeze dried weight) 45 40 35 30 25 20 15 10 5 Nordvestø Carey Islands, Greenland M.Goodsite/N. Rausch 4520 BP 5065 BP 5414 BP 5940 BP 0 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 Depth (cm) 6205 BP Figure 21. Preliminary results for mercury for Nordvestø, Carey Islands, Greenland. The permafrost starts at 8 cm. Peat was sampled using a new rotary corer developed for frozen peat (Noernberg et al., 2003, Appendix C) Prelimary dating results show that the peat had a very linear accumulation, and that core represents approximately 1700 years of peat accumulation from the mid Holocene, with a 1 cm slice representing approximately 10 years of peat accumulation. Unpublished data. The mercury concentrations found in the peat profile from Nordvestø, Carey Islands, NW Greenland are shown in Figure 21., page 87. The study of peat from the Carey Islands is still ongoing at the time of completion of this Ph.D. The active layer extends to the depth of 8 cm. The core is just over 2 meters long and preliminary dates show that the core covers the mid-Holocene. The peat formed from moss that grew on bird droppings from seabirds that sat on the cliff, as evidenced by feathers found in each centimetre layer. The feathers have been sent to the Danish National Zoological Museum for species determination. There are very distinct discrete peaks in the core, for example between 120 and 130 cm deep. The concentration trend seems to be rising. The
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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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