Is the time right to add lightning-NO to operational air quality forecast models? Dale Allen Dept. of Atmos and Oceanic Sci, UMD-College Park Kenneth Pickering.

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Presentation transcript:

Is the time right to add lightning-NO to operational air quality forecast models? Dale Allen Dept. of Atmos and Oceanic Sci, UMD-College Park Kenneth Pickering Atmos Chem and Dyn Branch, NASA-GSFC Robert Pinder and Thomas Pierce Atmos Modeling and Analysis Div, U.S. EPA William Koshak Earth Science Office, NASA-MSFC 2011 Int’l Workshop on AQ Forecasting Research 30 November 2011

Motivation for Including Lightning NO x in CMAQ In the summer over the US, production of NO by lightning (LNO x ) is responsible for 60-80% of upper tropospheric (UT) NO x and 20-30% of UT ozone (Zhang et al., 2003; Allen et al., 2010). Mid- and upper-tropospheric ozone production rates are highly sensitive to NO x mixing ratios. Inversion-based estimates of NO emissions from CMAQ simulations w/o LNO x have large errors at rural locations (Napelenok et al., 2008). CMAQ-calculated N deposition is much too low without LNO x (e.g., Low-bias in CMAQ nitric acid wet deposition at NADP sites cut in half when LNO x was added). LNO x can add several ppbv to summertime surface O 3 concentrations

CMAQ Lightning-NO emission Parameterization LNO x = k* PROD*LF, where k: Conversion factor (Molecular weight of N / Avogadros #) PROD: Moles of NO produced per flash (defaults to 500 moles) LF: Total flash rate (IC + CG), where LF = G * α i,j * (precon i,j – threshold), where Precon:Convective precipitation rate from WRF threshold: Value of precon below which the flash rate is set to zero. G: Scaling factor chosen so that domain-avg WRF flash rate matches domain averaged observed flash rate. α i,j :Local or continental/marine scaling factor chosen so that monthly avg model flash rate for each grid box or region equals observed flash rate For retrospective simulations, observed flash rate can be the United States National Lightning Detection Network (NLDN)-based monthly (or seasonal) average total flash rate for the month of interest Operational forecasts could use satellite-retrieved or NLDN-based climatological flash rates for a season as observations.

Note: The use of a climatological Z when estimating the total flash rate is the main source of uncertainty in the total flash rate. NLDN records a high % of cloud-to-ground (CG) flashes and a low % of intracloud (IC) flashes. After extracting CG flashes, total flash rate is est by multiplying CG flash rate by Z+1, where Z (shown below) is the IC/CG ratio

Implementation of lightning-NO parameterization in v5.0 of CMAQ: LNO x = k* PROD*LF, where LF = G * α i,j * (precon i,j – threshold), There are four run-time options: 1. No lightning-NO 2. LNO x read in from a 4-D input file 3. LNO x calc online using climatological marine & continental relationships between NLDN-based total flash rate & convective precipitation rate. 4. LNO x calc online using year and month-specific relationships between NLDN- based total flash rate & convective precipitation rate at each grid box. Note: detection-efficiency adjusted ests of monthly avg flash rates will be made available to tropospheric chemistry and AQ communities. NO emissions per flash will default to 500 moles for both IC & CG flashes; however, user will have option of choosing separate values for IC&CG flashes.

Vertical distribution of LNOx is assumed to be α To pressure X the vertical distribution of Flash channel lengths From the North Alabama Lightning Mapping Array Emissions distributed Between surface and Cloud top. T profile used to determine location of lower peak Vertical partitioning of lightning-NO emissions Segment altitude distribution for all flashes from Koshak et al. [2010]

Observed Flash rate Modeled Flash rate For run-time Option 4

Observed Flash rate Modeled Flash rate For run-time Option 4

Diel variations in flash rate well captured during the summer

Temporal variations in daily-average flash rate poorly Captured during the summer

Summary of hourly, diurnal, and daily correlations for 2006 (solid) And 2004 (dashed)

CMAQ simulation of summer 2006 Simulations of 2006 air quality performed at EPA under the management of Wyat Appel and Shawn Roselle as part of the Air Quality Model Evaluation International Initiative (AQMEII) Version of CMAQ used with CB-05 chemical mechanism NEI-based emissions with year specific power plant emissions from CEMS and satellite-derived wildfire emissions Chemical boundary conditions from GEMS (European-led assimilation effort)

OMI tropospheric NO 2 products 1.DP-GC product [Lamsal et al., 2010] 2. v2.0 DOMINO product [Boersma et al., 2007; Boersma et al., 2011] DP-GC and DOMINO products begin with same slant column & use same method to remove stratospheric column. Different methods used to convert tropospheric slant cols to overhead cols  Yield different tropospheric vertical column amounts tropopause

R=0.79R=0.47

Mean summer 2006 enhancement of 8-hr maxO3 in CMAQ v4.7.1 due to LNO x O 3 enhancement (ppbv)

Impact of Lightning NO on Monthly Average Surface O 3 during the summer of 2006 Calculated by Wyat Appel using v5.0 of CMAQ

In general, the contribution of LNO x to 8hrO3 decreases on bad AQ days over the eastern U.S.

Adding LNO x eliminates low-bias Adjusting for precip bias leads to better fit Eastern US: Longitudes east of 100W (nitrate)

Nitrate Biases NE: +5% SE: +19% West –(5-10)% Ammonium biases NE: +20% SE: +40% West: -(20-25)%

Summary Contribution of LNO x to mean model column is ~25%, ranging from ~10% in the northern states to >45% along the Gulf of Mexico and in the southwestern states. For a 500 mole per flash LNOx source, CMAQ columns have a high-bias wrt DOMINO columns over urban areas. Mean biases at other locations were generally minor after accounting for the impacts of LNOx and the averaging kernel on model columns. LNO x increases wet dep of nitrate by 43%, total dep of N by 10%, & changes 30% low-bias wrt NADP measurements to 2% high-bias. On poor AQ days (O3>60 ppbv), LNO x contributes >6.5 ppbv to 8hrO 3 at 10% of western sites and 3% of eastern sites Adding LNOx is unlikely to improve forecasts of 8hr ozone –Day-to-day variations in flash rate are poorly simulated in the summer (better agreement when flashes are associated with frontal passages) –NLDN network samples CG flashes while both IC & CG flashes contribute to LNOx (geostationary measurements of total flash rate will help).

Acknowledgments Wyat Appel & Shawn Roselle of EPA: AQMEII simulations Kristin Foley & Jeffrey Young: Implementation of LNOx in CMAQ L. Lamsal: DP-GC NO2 data. OTD/LIS data are from NASA/MSFC. NLDN data are collected by Vaisala Inc NASA Applied Science Air Quality Program

Processing of DOMINO & CMAQ fields Gridded DOMINO fields created by mapping version 2.0 level 2 DOMINO fields onto 0.25°x0.25° grid. DOMINO retrievals over snow/ice or with cloud radiance fractions > 50% filtered out (Boersma et al., 2009) Mean value in each grid box obtained using algorithm that gives more weight to near-nadir pixels and to pixels with low geometric cloud fractions (Celarier and Retscher, 2009). CMAQ profiles extracted at location of high-quality DOMINO pixels & weighted in same manner. CMAQ output interpolated onto TM4 vertical grid (TM4 model used to obtain a priori profiles for DOMINO product). When appropriate, averaging kernel is applied to tropospheric model sub- columns before weighting is performed (Allen et al., 2010; Boersma et al., 2009). CMAQ tropospheric NO 2 column determined by summing sub-columns within the troposphere, where the number of tropospheric layers is included in DOMINO data product.