DYNAMO: DYnamic Inputs of Natural Conditions for Air Quality MOdels

AQAST Year 3 Tiger TeamDaniel 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)

Can use existing UAH insolation archive to recover PAR

Insolation Correction Factor PAR

Application of daily varying stratospheric ozone columns in AQ models: Consequences for photolysis rates in the troposphere.

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.

TOMS ozone over US, Mar 11, 1990

500350200DU

North America experiences different stratospheric airmasses on synoptic timescales. Hudson et al., 2003.

Loretta J. Mickley and Lulu Shen, Harvard

OMI-MLS stratospheric ozone columns show good agreement with ozonesondes. Wargan et al., 2013.

Lower strat ozone columns, 2005-2012

50 hPa to tropopause

BDSNP Soil NOx scheme

• Implemented in CMAQ with inline biogenics• Compared to Yienger & Levy• Next step: Compare with satellite & other data