modeling)oxidant)chemistry)in)a)high3 isoprene)atmospheric...
TRANSCRIPT
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Modeling)oxidant)chemistry)in)a)high3isoprene)atmospheric)environment:)sensi7vity)to)model)resolu7on)and)
constraints)from)aircra:)observa7ons!
Karen!Yu,!Daniel!Jacob,!Jenny!Fisher,!Sungshik!Kim,!Katherine!Travis,!Lei!Zhu,!Robert!Yantosca,!Melissa!Sulprizio,!Thomas!Ryerson,!Armin!
Wisthaler,!Alan!Fried,!Paul!Wennberg,!and!the!SEAC4RS!Science!Team!)
7)May)2015)IGC7)
-
Computa7on)expense)of)tropospheric)chemistry)simula7ons)requires)evalua7on)of)benefits)of)increasing)grid)resolu7on)
2!
Resolu7on) Resource)requirements)(normalized)to)4x5))
4ox5o!! 1!
2ox2.5o! 8!
0.25ox0.3125o! 1536!
-
Computa7on)expense)of)tropospheric)chemistry)simula7ons)requires)evalua7on)of)benefits)of)increasing)grid)resolu7on)
2!
• Effect!of!grid!resoluTon!on!NOXXsaturated!vs.!NOXXlimited!regime!has!been!extensively!studied.!
Resolu7on) Resource)requirements)(normalized)to)4x5))
4ox5o!! 1!
2ox2.5o! 8!
0.25ox0.3125o! 1536!
10!
1!
0.1!
0.01!
NOX!(ppb)!
NOX!concentraTon!
Ozone
!prod
ucTo
n!
NOX3saturated)HOX!loss:!NO2+OH!
NOX3limited)HOX!loss:!HO2+HO2!
-
Computa7on)expense)of)tropospheric)chemistry)simula7ons)requires)evalua7on)of)benefits)of)increasing)grid)resolu7on)
2!
• Effect!of!grid!resoluTon!on!NOXXsaturated!vs.!NOXXlimited!regime!has!been!extensively!studied.!
• As!NOX!emissions!decline,!it!becomes!increasingly!important!to!evaluate!model!ability!to!represent!interacTon!of!biogenic!and!anthropogenic!emissions.!
Resolu7on) Resource)requirements)(normalized)to)4x5))
4ox5o!! 1!
2ox2.5o! 8!
0.25ox0.3125o! 1536!
10!
1!
0.1!
0.01!
NOX!(ppb)!
High3NOX))RO2+NO!
Low3NOX))RO2+HO2!
How)does)grid)resolu7on)affect)model)representa7on)of)high3NOX)vs.)low3NOX)regimes?)
VOC)+)OH)
High!NOX:!nitrate!producTon,!ozone!producTon!
Low!NOX:!chain!terminaTon,!sink!for!HOx!
RO2)
-
Evaluate)GEOS3Chem)run)at)4ox5o,)2ox2.5o)and)0.25Ox0.3125o)resolu7ons)against)SEAC4RS)observa7ons)
3!
4x5!global,!starTng!January!2013!
2x2.5!global,!start!January!2013!
0.25x0.3125!N.!America!with!4x5!boundary!condiTons,!start!run!August!2013!
GEOS!meteorology!at!0.25x0.3125!resoluTon!
-
Evaluate)GEOS3Chem)run)at)4ox5o,)2ox2.5o)and)0.25Ox0.3125o)resolu7ons)against)SEAC4RS)observa7ons)
3!
4x5!global,!starTng!January!2013!
2x2.5!global,!start!January!2013!
0.25x0.3125!N.!America!with!4x5!boundary!condiTons,!start!run!August!2013!
GEOS!meteorology!at!0.25x0.3125!resoluTon!
Instrument)(PI)) Measurement)
CSD!CL!(T.!Ryerson)! Ozone!
NO!
NO2!PTRMS!(A.!Wisthaler)! Isoprene!
CAMS!(A.!Fried)! Formaldehyde!
Observa7ons)from)SEAC4RS)aircra:)campaign)
Boundary!!layer!comparisons!
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Emissions)of)NOX)and)isoprene)in)Southeast)US)show)high)granularity)and)spa7al)an73correla7on)
YU ET AL.: IMPACT OF RESOLUTION ON TROP CHEM SIMULATIONS X - 15
NOx emissions at 0.25x0.3125
30oN
35oN
100oW 90oW 80oW
0 30 60 90 120 molec/cm2/s * 1e9
Isoprene (0.25x0.3125)
30oN
35oN
100oW 90oW 80oW
0.00 1.00 2.00 3.00 4.00 molec/cm2/s * 1e12
Figure 1. Emissions of anthropogenic NOX, soil + fertilizer NOX, lightning NOX, and isoprene
at each resolution for August 2013. Anthropogenic NOX emissions are from the NEI2008 inven-
tory. Soil and fertilizer NOX are computed using the parameteriztation of Hudman et al. [2012].
Lightning NOx computed based on satellite data as in Murray et al. [2012]. Isoprene emissions
from MEGAN [Guenther et al., 2012].
D R A F T April 24, 2015, 5:59pm D R A F T
4!
-
Emissions)of)NOX)and)isoprene)in)Southeast)US)show)high)granularity)and)spa7al)an73correla7on)
YU ET AL.: IMPACT OF RESOLUTION ON TROP CHEM SIMULATIONS X - 15
NOx emissions at 0.25x0.3125
30oN
35oN
100oW 90oW 80oW
0 30 60 90 120 molec/cm2/s * 1e9
Isoprene (0.25x0.3125)
30oN
35oN
100oW 90oW 80oW
0.00 1.00 2.00 3.00 4.00 molec/cm2/s * 1e12
Figure 1. Emissions of anthropogenic NOX, soil + fertilizer NOX, lightning NOX, and isoprene
at each resolution for August 2013. Anthropogenic NOX emissions are from the NEI2008 inven-
tory. Soil and fertilizer NOX are computed using the parameteriztation of Hudman et al. [2012].
Lightning NOx computed based on satellite data as in Murray et al. [2012]. Isoprene emissions
from MEGAN [Guenther et al., 2012].
D R A F T April 24, 2015, 5:59pm D R A F T
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r = −0.15
1e+10
1e+11
1e+12
1e+11 1e+12 1e+13Isoprene emiss. (molec cm−2s−1)
NO e
miss
. (m
olec
cm−2
s−1 )
0.25x0.3125
●●●●●
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r = 0.10
1e+10
1e+11
1e+12
1e+11 1e+12 1e+13Isoprene emiss. (molec cm−2s−1)
2x2.5
● ●●●
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●●●
r = 0.76
1e+10
1e+11
1e+12
1e+11 1e+12 1e+13Isoprene emiss. (molec cm−2s−1)
4x5
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r = −0.15
1e+10
1e+11
1e+12
1e+11 1e+12 1e+13Isoprene emiss. (molec cm−2s−1)
NO e
miss
. (m
olec
cm−2
s−1 )
0.25x0.3125
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r = 0.10
1e+10
1e+11
1e+12
1e+11 1e+12 1e+13Isoprene emiss. (molec cm−2s−1)
2x2.5
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r = 0.76
1e+10
1e+11
1e+12
1e+11 1e+12 1e+13Isoprene emiss. (molec cm−2s−1)
4x5
-
Probability)distribu7ons)for)primary)and)secondary)species)
5!
• Effect!of!grid!resoluTon!more!apparent!for!highly!skewed!distribuTons:!resoluTon!of!smallXscale!features!allows!for!more!extreme!tail!values!
• ResoluTon!differences!for!secondary!species!related!to!differences!in!chemical!pathways!
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