Earth Science & Climate Change, San Francisco, 28 -30 July 2014 Potential Controls on Trends in...
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Earth Science & Climate Change, San Francisco, 28 - Potential Controls on Trends in Background Concentrations of Hg in the Northeastern US Huiting Mao Department of Chemistry State University of New York College of Environmental Science and Forestry
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Earth Science & Climate Change, San Francisco, July 2014 Thompson Farm Pack Monadnock Huntington 3.8±0.9 ppqv yr -1 Mace Head: 3.1±1.1 ppqv yr -1 Ebinghaus et al. (2011) Cape Point South Africa 3.8±0.6 ppqv yr -1, Slemr et al. (2011) Canadian mid-latitude sites ~2.6 – 3.9 ppqv yr -1 Cole et al. (2013)
Transcript of Earth Science & Climate Change, San Francisco, 28 -30 July 2014 Potential Controls on Trends in...
Earth Science & Climate Change, San Francisco, 28 -30 July 2014
Potential Controls on Trends in Background Concentrations of
Hg in the Northeastern US
Huiting MaoDepartment of Chemistry
State University of New YorkCollege of Environmental Science and Forestry
Earth Science & Climate Change, San Francisco, 28 -30 July 2014
Thompson Farm – TF, Durham, NH, sea levelPack Monadnock – PM, Pack Monadnock, NH, 700 aslHuntington Wildlife Forest – HWF, Adirondacks, NY, 510 m asl
Earth Science & Climate Change, San Francisco, 28 -30 July 2014
1/1/04 1/1/05 1/1/06 1/1/07 1/1/08 1/1/09 1/1/10
Hg
o Anomaly (ppqv)
-40
-20
0
20
40
1/1/04 1/1/05 1/1/06 1/1/07 1/1/08 1/1/09 1/1/10
Hg
O Anom
aly (ppqv)
-40
-20
0
20
40Thompson Farm
Pack Monadnock
Huntington
1/1/06 1/1/07 1/1/08 1/1/09 1/1/10 1/1/11 1/1/12 1/1/13 1/1/14
25th percentile anomaly H
go (ppqv)
-50
0
50
100
3.8±0.9 ppqv yr-1 Mace Head: 3.1±1.1 ppqv yr-1 Ebinghaus et al. (2011)
Cape Point South Africa3.8±0.6 ppqv yr-1, Slemr et al. (2011)
Canadian mid-latitude sites ~2.6 – 3.9 ppqv yr-1 Cole et al. (2013)
Earth Science & Climate Change, San Francisco, 28 -30 July 2014
Pack Monadnock
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Rate of C
hange (ppqv yr-1
)
-16
-14
-12
-10
-8
-6
-4
-2
0
Thompson Farm
Huntington
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Rate of C
hange (ppqv yr-1
)
-20
-10
0
10
20
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Rate of C
hange (ppqv yr-1
)
-6
-4
-2
0
2
4
6
• In colder months the trends were more associated with anthropogenic emission reductions;
• In warmer months other sources/sinks and processes became more significant and even predominant.
Earth Science & Climate Change, San Francisco, 28 -30 July 2014
1/1/06 7/1/06 1/1/07 7/1/07 1/1/08 7/1/08 1/1/09 7/1/09 1/1/10 7/1/10
Hg
o (ppqv)
100
150
200
250 HWFTFPMHWFTFPM
HWF: -1.8 ± 3.4 ppqv yr-1
TF: -0.8 ± 1.9 ppqv yr-1
PM: -3.6 ± 1.4 ppqv mon-1
For the overlapping period February 2006 – August 2010
Earth Science & Climate Change, San Francisco, 28 -30 July 2014
Hg0 MMAs corresponding to 75th percentile CO mixing ratios at TF and PM
1/1/03 1/1/04 1/1/05 1/1/06 1/1/07 1/1/08 1/1/09 1/1/10 1/1/11
Hg
o Anomaly (ppqv)
-40
-20
0
20
40 a) TF
1/1/05 1/1/06 1/1/07 1/1/08 1/1/09 1/1/10 1/1/11
Hg
o Anomaly (ppqv)
-40
-20
0
20
40 b) PM
1/1/06 1/1/07 1/1/08 1/1/09 1/1/10 1/1/11 1/1/12 1/1/13 1/1/14
95th percentile anomaly H
go (ppqv)
-100
0
100
200
300 c) HWF95th percentile Hg0 MMAs at HWF
4.8±0.7 ppqv yr-1
2.0±0.8 ppqv yr-1
3.5±1.3 ppqv yr-1
Earth Science & Climate Change, San Francisco, 28 -30 July 2014
Figure 6.
PM GEM in Polluted Air Masses (CO>75th percentile)
TF (CO> 75th percentile)
HWF (95th percentile)
For TF, other sources/processes in warmer months could overtake anthropogenic influence.
Earth Science & Climate Change, San Francisco, 28 -30 July 2014
1/1/04 1/1/05 1/1/06 1/1/07 1/1/08 1/1/09 1/1/10
Hg
o Anomaly (ppqv)
-40
-20
0
20
40
1/1/04 1/1/05 1/1/06 1/1/07 1/1/08 1/1/09 1/1/10
Hg
O Anom
aly (ppqv)
-40
-20
0
20
40Thompson Farm
Pack Monadnock
Huntington
1/1/06 1/1/07 1/1/08 1/1/09 1/1/10 1/1/11 1/1/12 1/1/13 1/1/14
25th percentile anomaly H
go (ppqv)
-50
0
50
100
Background Concentrations
Earth Science & Climate Change, San Francisco, 28 -30 July 2014
1/1/03 1/1/04 1/1/05 1/1/06 1/1/07 1/1/08 1/1/09 1/1/10 1/1/11
Hg
o Anomaly (ppqv)
-20
0
20
40
60a) TF
1/1/06 7/1/06 1/1/07 7/1/07 1/1/08 7/1/08 1/1/09 7/1/09 1/1/10 7/1/10 1/1/11
Hg
o Anomaly (ppqv)
-100
0
100
200
300
400c) HWF
1/1/05 1/1/06 1/1/07 1/1/08 1/1/09 1/1/10 1/1/11 H
go Anom
aly (ppqv)
-20
-10
0
10
20
30
40
50b) PM
2.1 ± 0.6 ppqv yr-1
1.6 ± 0.6 ppqv yr-1
22 ±6 ppqv yr-1
Anthropogenic Contribution
Earth Science & Climate Change, San Francisco, 28 -30 July 2014
1/1/02 1/1/03 1/1/04 1/1/05 1/1/06 1/1/07 1/1/08 1/1/09 1/1/10 1/1/11
Hg
o Anomaly (ppqv)
-40
-20
0
20
40
Precipitation (m
m)
0
100
200
300
400
500
1/1/02 1/1/03 1/1/04 1/1/05 1/1/06 1/1/07 1/1/08 1/1/09 1/1/10 1/1/11
Hg
o Anomaly (ppqv)
-80
-40
0
40
80
Precipitation (m
m)
0
50
100
150
200
250
HWF
TF Background GEM vs. Precipitation
Earth Science & Climate Change, San Francisco, 28 -30 July 2014
TF Wet Deposition
Lombard et al., 2011, acp
Earth Science & Climate Change, San Francisco, 28 -30 July 2014
AcknowledgmentsThis study was funded by NSF AGS 1141713 and EPA STAR 83521501
