DYNAMO: DYnamic Inputs of Natural
Conditions for Air Quality MOdels
AQAST Year 3 Tiger Team
Daniel Cohan, Loretta Mickley, Arastoo Pour
Biazar, Richard McNider, Bryan Duncan
DYNAMO Objectives
• GOES satellite based photosynthetically
active radiation (PAR) and photolysis rates
• Daily varying stratospheric ozone columns
in GEOS-Chem and CMAQ
• Improved biogenic emissions
– Satellite PAR & dynamic vegetation in MEGAN
– New soil NO emissions scheme in CMAQ
• Sharing of products through EPA’s RSIG
Air Quality Management Partners
• US EPA: Jesse Bash, Pat Dolwick, and
Chris Misenis
• Texas Commission on Environmental
Quality: Mark Estes
• California Air Resources Board: Jeremy
Avise
Goal: Improve the Physical Atmosphere for Biogenic Emissions
through use of Satellite Data
Biogenic emissions are strongly tied to the physical atmosphere through PAR,
temperature and soil moisture
Example - Use of satellite derived insolation to recover PAR needed in biogenic
emission models
Factors in conversion of insolation to PAR (Frouin and Pinker 1994)
Insolation
Correction Factor
Can use existing UAH insolation archive to recover PAR
PAR
Application of daily varying stratospheric ozone columns in AQ
models: Consequences for photolysis rates in the troposphere.
TOMS ozone over US, Mar 11, 1990
Loretta J. Mickley and Lulu Shen, Harvard
North America experiences different stratospheric
airmasses on synoptic timescales. Hudson et al., 2003.
DU
200
350
500
Lower strat ozone columns, 2005-2012
50 hPa to
tropopause
Motivation: Most AQ models rely on interpolations of
biweekly or monthly mean stratospheric ozone (SOC) to
characterize daily solar radiation input to troposphere.
SOC, however, can vary significantly on daily time scales.
Approach: Use satellite data to quantify response of
tropospheric photochemistry to SOC.
Deliverable: Database of daily varying SOC for use in AQ
models.
Progress so far: We are testing OMI-MLS daily ozone
columns in GEOS-Chem over the 2005-2012 time period.
These columns are produced by GEOS-5.7.2 in a 2x2.5
assimilation run with MLS and OMI observations.
OMI-MLS stratospheric ozone columns show good
agreement with ozonesondes. Wargan et al., 2013.
BDSNP Soil NOx scheme
• Implemented in CMAQ with inline biogenics
• Compared to Yienger & Levy
• Next step: Compare with satellite & other data