Evaluation of modeled surface ozone biases as a function of cloud cover fraction Hyun Cheol Kim 1,2, Pius Lee 1, Fong Ngan 1,2, Youhua Tang 1,2, Hye Lim.

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Evaluation of modeled surface ozone biases as a function of cloud cover fraction Hyun Cheol Kim 1,2, Pius Lee 1, Fong Ngan 1,2, Youhua Tang 1,2, Hye Lim Yoo 1,2, Li Pan 1,2 and Ivanka Stajner 3 1 NOAA Air Resources Laboratory, College Park, MD 2 University of Maryland, Cooperative Institute for Climate and Satellites, College Park, MD 3 NOAA National Weather Service, Silver Spring, MD 1 Air Resources Laboratory

Outline Motivation Photolysis rate Cloud fractions in observations, models and satellites Data & Methodology Comparison with model NAQFC (N. America) IMAQS-K (East Asia) Summary

Photolysis rate

Adjustment of photolysis rate Photolysis rate adjustment is proportional to the cloud fraction

Defining “Cloud Fraction” In model: relative humidity (w/ critical RH) In satellite: radiance (BT & BTD) In surface site : visual inspection, sky imager TSI-880 AUTOMATIC TOTAL SKY IMAGER Aqua satellite

MODIS Cloud Mask (MOD35) 6 Air Resources Laboratory

CF calculation in MCIP DO k = 1, metlay ! Define RH and critical RH of all layers. rh = xwvapor(c,r,k) / & qsat( e_aerk( xtempm(c,r,k)-stdtemp ), xpresm(c,r,k) ) rh = MIN(rh,1.0) ! Set RHC to at least 98% in PBL - JEP 5/91 IF ( x3htf(c,r,k-1) rhc ) THEN ! CBL mixing induced clouds should not exceed the frac area of ! the updrafts at top of cbl, les estimates are ~34% ! (Schumann 89, and Wyngaard and Brost 84) ccov(k) = 0.34 * ( rh - rhc ) / ( rhc ) ELSE ccov(k) = 0.0 ENDIF ELSE sg1 = xpresm(c,r,k) / xpresm(c,r,kmx) rhc = ( 2.0 * sg1 * (1.0-sg1) * ( *(sg1-0.5)) ) IF ( rh > rhc ) THEN ccov(k) = ( (rh - rhc)/(1.0 - rhc) )**2 ! Geleyn et al., 1982 ELSE ccov(k) = 0.0 ENDIF ENDIF ccov(k) = MAX( MIN( ccov(k), 1.0 ), 0.0 ) ENDDO Cloud cover is estimated based on the relative humidity using critical relative humidity threshold

Problems may happen due to … 1) Wrong displacement of cloud fields in space and/or time 2) Model’s capability to produce appropriate amount of cloud field

Data & Methodology National Air Quality Forecast Capability (NOAA) WRF-NMMB / CMAQ IMAQS-K (Ajou. University) WRF-ARW/CMAQ MODIS cloud product (MOD06) KMA observations & synoptic weather chart (Georeferencing)

Model CF (snapshot) MODIS CF (snapshot) Model CF (monthly mean) MODIS CF (monthly mean) 10 Air Resources Laboratory

Cloud Fraction distribution (land only) 11 Air Resources Laboratory

Cloud Fraction & Surface Ozone EPA AQS MDA8 ozone (daily max 8h moving average ozone, 1024 sites) 12 Air Resources Laboratory

13 Air Resources Laboratory

Slope = ppb/100% Mean AQS O3 = ppb Mean NAQFC O3 = ppb Mean CF (MODIS) = 0.56 Mean CF (NAQFC) = CF means 2.1 ppb (36% of O 3 overestimation, 5.79 ppb) CF difference & ozone bias 14 Air Resources Laboratory

Cloud fraction comparison ( , 103 military sites, monthly mean) 15 Air Resources Laboratory

MODIS cloud fraction & weather chart (East Asia) Georeferencing & Alpha channel blending 16 Air Resources Laboratory

Cloud Fraction & Surface Ozone (May 2014)

Cloud fraction comparison (May 2014, KMA) MODIS CF is slightly higher than KMA CF while CMAQ CF shows considerable underestimation. OBS MODISModel 18 Air Resources Laboratory

723910: US Point Mugu NAS latitude: , longitude: CFSR_18Z monthly mean ECMWF_18Z monthly meanMERRA_18Z monthly mean JRA-55 monthly mean Long-term cloud fraction comparison (Observation & Global Models) (Courtesy by Hye-Lim Yoo) 19 Air Resources Laboratory

Who cares cloud fraction….? Climate model doesn’t care cloud fraction …. Weather model doesn’t care cloud fraction …. Air quality model doesn’t care… If radiation is OK If precipitation is OK and blame emission

Future works Radiation-based photolysis adjustment Correlation of cloud fraction & radiation Cloud type (Low-, Middle-, High- cloud types) More satellite cloud products GOES (temporal resolution) MODIS (cloud type) VIIRS (spatial resolution)

Take Home Messages The photolysis rate is crucial in photochemistry. It can be calculated using RTM, and is adjusted using the cloud coverage (e.g. cloud fraction). The definition of cloud fraction is ambiguous, and not physically consistent in model, in satellite, and in situ observation. Cloud fraction differences are associated with surface ozone biases. Current modeled cloud fields are too bright (less cloud fraction), having a possibility to cause overestimation of surface ozone production.