WACCM Studies of Mesospheric Metal Chemistry
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Transcript of WACCM Studies of Mesospheric Metal Chemistry
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WACCM Studies of Mesospheric Metal Chemistry
Wuhu Feng1,2
Acknowledgments:
John Plane1,Martyn Chipperfield3,Dan Marsh4,Diego Janches5 , Erin Dawkins1,2, Josef Hoffner5, Fan Yi6, Chester Gardner7 , Jonathan Friedman8 ,Jonas Hedin9
Institute for Climate and Atmospheric ScienceSCHOOL OF EARTH AND ENVIRONMENT
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Outline
1) Introduction2) Mesospheric Metal layers3) WACCM model4) Results5) Summary 6) Future work
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Atmospheric Layers
Mesosphere
Stratosphere
Troposphere
Thermosphere
Tropopause
Stratopause
Mesopause
StratosphericOzone Layer
MeteoricMetals (Na,Fe, Mg, Ca, K, Si, Ti etc.) Layer
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Layers of metals atoms
Plane (2011)
Questions: Sources? Useful tracers of dynamic processes (i.e., gravity waves, tides)? Impact on stratosphere/troposphere? Solar cycle impacts? It requires detailed processes controlling the metal layers!
Concentration cm-3
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MLTMetals
Radiation
Chemistry
Photolysis
ProcessesAblations (Source)
Dynamics
Aurora
PMCs
PSCs
Clouds
circulations, gravity waves etc. EmissionsDeposition
Aerosol
Tides
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Multi-scale Modelling of Mesospheric Metals (4M) project
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An example of ablation profiles
Ablation profiles from 1D CABMOD model(SZA=35o,V=21 km/s, mass=4µg).
Ablation-high velocity collisions with atmospheric molecules lead to rapid heating, melting and evaporation when particles enter the earths atmosphereDifferent metals are released at different altitudes The deposition varies with mass, SZA and velocity
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Metal Chemistry-Fe example
Plane (2003)
Meteoric ablation injects metal atoms and ions;
Neutral/ion-molecules chemistry
Metal atoms oxidisation
Metal atoms charge exchange
Metal reservior species
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Sodium Chemistry in the Upper Atmosphere
1) Ionization of Na by charge transfer with the ambient ions in the lower E region.
2) The Na layer appears in the upper mesosphere due to the dramatic increase in atomic oxygen and hydrogen above 80 km which convert NaHCO3 back to Na
3) Na layer is sensitive to perturbation in the odd oxygen photochemistry and plasma density
Plane (ACP, 2004)
Ion Chemistry
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Magnesium Chemistry in MLTMg is one of the most abundance of Metals in the MLTUnlike other Meteoric metals (Fe, Na, K and Ca), neight Mg/Mg+ can be observed by ground-based lidar (laser radar) as they have resonance transitions in the UV reagion at 285 and 280 nm where light is strongly absorbed by stratospheric.Mg+ is produced from Mg by photoionization and charge transfer with NO+ and O+ (dominant ions in the LT)Mg+/Mg=1.5-10Na+/Na=0.2Ca+/Ca=2Mg+ is not significant depleted relative to other metals in the MLT
Plane and Whalley (J. Phys. Chem. A., 2012)
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Atmosphere large-scale circulation
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• Whole Atmosphere Community Climate Model uses the software
framework of the NCAR CESM
• Atmospheric layers coupling,processes,climate variability/change
• σ-p coordinates (66 levels) from surface up to 140 Km
(~1.5 km in LS and ~3 km in MLT)
• 4ox5o and 1.9ox2o horizontal resolution
• Detailed dynamics/physics in the Troposphere/Stratosphere/
Mesosphere/Thermosphere (Finite-Volume dynamics Core)
• Detailed Chemical processes in the atmosphere (using NCAR
MOZART-3 chemistry package (Ox, HOx,ClOx, BrOx etc.))
• Ion Chemistry and other parameters……
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WACCM Performance for the MLT region
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Electron Density
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PMCs comparison (SOFIE and WACCM)
Hervig et al. (2009, JASTP)
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WACCM ChemistryLong-lived Species: (19 species)
Misc: CO2, CO, CH4, H2O, N2O, H2, O2
CFCs: CCl4, CFC-11, CFC-12, CFC-113
HCFCs: HCFC-22
Chlorocarbons: CH3Cl, CH3CCl3,
Bromocarbons: CH3Br
Halons: H-1211, H-1301
Constant Species: N2 , N(2D)
Short-lived Species: (31-species)
OX: O3, O, O(1D)
NOX: N, NO, NO2, NO3, N2O5, HNO3, HO2NO2
ClOX: Cl, ClO, Cl2O2, OClO, HOCl, HCl, ClONO2, Cl2
BrOX: Br, BrO, HOBr, HBr, BrCl, BrONO2
HOX: H, OH, HO2, H2O2
HC Species: CH2O, CH3O2, CH3OOH
13 Additional Surface Source Gases (NHMCs): CH3OH, C2H6, C2H4, C2H5OH, CH3CHO, C3H8, C3H6, CH3COCH3, C4H8, C4H8O, C5H8, C5H12, C7H8, C10H16
~45 Additional radical species
Detailed 3D emission inventories of natural and anthropogenic surface sources;
Dry/Wet deposition of soluble species
Lightning and Aircraft production of NOx
12 Heterogeneous processes, 71 photolysis reactions, 183 gas phase reactions
No Metal Chemistry (e.g., Na, Fe, Ca, Mg, K, Si, etc. ) in the standard WACCM model, but now includes in WACCM
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Meteoric Input function of Fe
Minimum springtime and maximum autumn MIF of FeThe annual mean MIF used in the model is 9414 atoms cm-2s-1
Note large range of MIF (4300-38000 atoms cm-2s-1) used in previous Fe 1D models simulations for different locations
Total input is ~ 2.2 tonnes/day
Feng et al. (JGR, in revision)
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Annual mean Fe and other species (40N)
Fe+ ions dominate on the top-side of the Fe layer(FeOH)2, FeOH and Fe(OH)2 are the dominant reservoirs on the underside of the layerSatisfactory simulations of Fe by model
Feng et al. (JGR, in revision)
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Annual mean Fe for other stations
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Fe+ profile comparison with Rocket data
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Fe+ profile comparison with Rocket data
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Fe Seasonal variations
Seasonal variation of Fe density with an early wintertime maximum and summertime minimum
Fe peak layer
Model simulates the mid-latitude Fe layer quite well
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SH High latitude
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South Pole
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South Pole
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Na Total Column Density
Constructing Mesospheric Na reference by combination of recent satellite observations (ie. OSIRIS/Odin) and ground-based lidar measurements by Plane (2010).
Successful input Na chemistry in WACCM model
Detailed MIF needed though there is good agreement between observations and model
Marsh et al. (JGR, submitted)
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Potassium Comparison
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Calcium
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Calcium at Kuhlungsborn
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Other Metal simulations
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Tidal Influences on the metal layer
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Gravity Wave impact on Fe layer
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Gravity Wave impact on Fe layer for SP
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SSW impacts on mesospheric metal layers
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Fe
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Solar Cycle Impact and trend (K and T)
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Other metals
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Tropical T and K anomaly
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Mid-latitude T and K anomaly
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High-latitude T and K anomaly
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Summary and Conclusions
Successful adding Mesospheric metal Chemistry (Na, Fe, K, Ca, Mg) into a 3D NCAR CESM (WACCM4) model ----The first global model of meteoric metals
Overall, WACCM with Fe/Na chemistry gives good simulation compared with Lidar/Satellite measurements.
Investigating different MLT metal layers within the same model will thus allow us to better understand the astronomy, chemistry and transport processes that control the different metal layers in the MLT.
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Ongoing Work
Cosmic dust in the terrestrial atmosphere (CODITA project)
NOx and HOx production by energetic electrons and impacts on polar stratospheric ozone (NOHO project)