Breakout Group on Aerosol Optical Properties & Radiative Effects of MILAGRO Science Meeting, 23-25 Oct 2006, Boulder, CO Chair: Phil Russell Co-Chair:

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Breakout Group on Aerosol Optical Properties & Radiative Effects of MILAGRO Science Meeting, Oct 2006, Boulder, CO Chair: Phil Russell Co-Chair: Manvendra Dubey Scribes: Yohei Shinozuka, Nancy Marley Update presented at INTEX-B Data Review Meeting 6-8 Mar 2007 Virginia Beach, VA

Breakout Group on Aerosol Optical Properties & Radiative Effects MILAGRO Science Meeting 24 Oct 2006 Boulder, Co Scope of Group: --in situ measurements (optics, size, composition, mixing state, single particle properties, consistency of all these) -- spectral radiation, at surface & in vertical profiles (& closure with in situ measurements) --comparison to satellite observations --aerosol effects on clouds

Breakout Group on Aerosol Optical Properties & Radiative Effects Purposes of breakout groups (agenda): Identify nuggets (major findings) & major unanswered questions our data and models can address Generate a draft list of potential papers (helped by the posters) Identify cross-cutting issues Identify future collaborations (within the breakout group & beyond)

Breakout Group on Aerosol Optical Properties & Radiative Effects Summary of potential papers*  Grouped into 5 categories : Papers - Comparisons 2 - Local m 3 closure of size distribution, composition, scattering, absorption, f(RH), CCN concentration 2 - Local column radiation closure 4 - Upscaling from land based and in-situ aircraft to satellites, local to regional 10 - Validation and comparison of remote sensing measurements18 Total36 *Detailed list has been ed

Breakout Group on Aerosol Optical Properties & Radiative Effects Major findings (nuggets):  UV absorption of Mexico City aerosol is larger than expected from the black carbon 1/ dependence (N. Marley, P. Arnott). This fits with: - At T 0 BC particles are coated with organics (T. Onasch, Slowik, Dubey): TEM (Adachi), SPMS (Moffet). - Absorption amplification on A/C (Shinozuka, Clarke et al.) - SSA near UV (Jim Barnard) - Plotting data by wavelength dependence of absorption and scattering produces clustering, with clusters probably dependent on sources and ageing (Clarke)

12 Hour Averages Abs( )=Abs( 0 ) [ / 0 ] Exp March 1 – 29 (Day 60 – 88), 2006 N. Marley et al. Wavelength dependence of aerosol absorption at T 0

Breakout Group on Aerosol Optical Properties & Radiative Effects Major findings (nuggets, cont’d):  Sun photometer (Microtops) network that operated during MILAGRO experiment helped to raise the importance of a better estimation of surface reflectance over urban area (is converging to higher values than assumed nowadays). This assumption can improve the AOD satellite products (MODIS algorithm with finer spatial resolution). (Castanho)

Sun-photometer Network Surface reflectance ratio between visible and short-wave infrared wavelengths varies as a function of surface cover and scattering angle. The urbanized area in Mexico City shows on average values around 0.73 Milagro / MCMA – 2006 / Castanho - MIT

Milagro/ MCMA-2006 / Castanho - MIT Plots show the MODIS AOD retrieved in this work with 1.5km spatial resolution over Mexico City compared to the sun photometer AOD measurement. Open dots are data from sun-photometer network/Milagro experiment 2006, and gray squares are data from CIMEL/AERONET from 2002 until The assumption on the surface reflectance ratio (visible and shortwave infrared wavelengths) makes all difference on the AOD retrieval with MODIS over the Mexico City urban area as shown in these two figures. The surface ratio of 0.73 shows to significant improvement on the validation of the retrieval in the region.

Breakout Group on Aerosol Optical Properties & Radiative Effects Major findings (nuggets, cont’d):  Over ocean, 98% of MODIS-Terra near-IR ( nm) aerosol optical depth (AOD) values differed from airborne sunphotometer (AATS) values by ±1  and should be reassessed? (Redemann, Russell)

J31 B200 DC-8C-130 MODIS/Aqua MISR, MODIS/Terra POLDER/Parasol OMI/AuraCALIPSOCloudSatGLORY

MODIS-Terra (March 5, 10, 12)MODIS-Aqua (March 10, 17) Over ocean, 98% of MODIS-Terra near-IR ( nm) aerosol optical depth (AOD) values differed from airborne sunphotometer (AATS) values by < the estimated uncertainty, ±0.03 ±0.05AOD. For MODIS-Aqua the % was 100%. These %s exceed the 66% expected if ±0.03 ±0.05AOD is ±1 . AOD Comparisons, MODIS vs AATS Gulf of Mexico, INTEX-B/MILAGRO, cells18 cells Redemann et al.

Breakout Group on Aerosol Optical Properties & Radiative Effects Major findings (nuggets, cont’d):  Over land, air & ground lidars show abrupt changes in BL depth. Similar rapid changes seen in airborne AOD transects (Eichinger, Lewandowski, Hair, Livingston). What causes these? Individual convective plumes? “River” advection from different sources in complex terrain?

Abrupt Changes in the Boundary Layer 13 Mar 2006 Eichinger et al.

Route Traveled in Previous Slide 13 Mar 2006 Eichinger et al.

E. Browell, J. Hair et al. DC-8 over J31 between T1 & T0, 20:15 UT DC-8 over J31 NW of T0, 20:28 UT 19:25 UT, DC-8 over J31 at T2

NNE of Mexico City T2 N of T1 “Visibility poor. Eyes burning in cockpit.” Livingston et al.

Breakout Group on Aerosol Optical Properties & Radiative Effects Unanswered questions our data and models can address:  What microphysical property information do MISR and MODIS data contain about urban pollution plumes over land?  How do we integrate satellite regional scale aerosol optical depth and air mass type spatial distributions with suborbital measurements and regional transport models?

Breakout Group on Aerosol Optical Properties & Radiative Effects Unanswered questions our data and models can address:  Can we differentiate between contrails and cirrus from multiangular, multispectral data? (Try adding tempearature and moisture data)  How can we identify subvisible cirrus?  How can we best identify plumes in studies of evolution?

Breakout Group on Aerosol Optical Properties & Radiative Effects Unanswered questions our data and models can address:  Can the observed enhanced UV absorption be correlated with the weather changes? (organics/sulfate and SSA variation)  What are organic aerosols’ refractive indices and densities, hygroscopicity, mixing state?

Breakout Group on Aerosol Optical Properties & Radiative Effects Cross-cutting issues:  What’s responsible for the enhanced UV absorption? Organics? Gas? - It’s important for UV satellite AOD retrievals (OMI, TOMS) + many other issues

Breakout Group on Aerosol Optical Properties & Radiative Effects Cross-cutting issues:  How do we distinguish between Megacity & Regional (background) effects for: - aerosol radiative forcing - trends, - less ozone than expected, - reduction of reactive VOCs with time, - PANs, … (Be explicit in defining regional/background: boundary layer vs. free troposphere, etc.)

Breakout Group on Aerosol Optical Properties & Radiative Effects Cross-cutting issues:  What are aerosol physical, chemical and optical properties? What data and models can provide accurate clocks to quantify their evolution?

Breakout Group on Aerosol Optical Properties & Radiative Effects -Future collaborations (within the breakout group & beyond): J31 RSP-AATS: - Validate RSP retrieved spectral optical depth Atmospheric correction of low altitude measurements to provide accurate surface polarized BRDF J31 RSP-AATS-SSFR: Evaluate remote sensing methods (RSP + lidar) for determining the aerosol radiative forcing profile against the measured spectral optical depth and radiative flux profile J31 CAR-AATS: Retrieve BRDF and aerosol optical properties simultaneously from combined data sets: CAR, AATS, and AERONET. Continue/extend satellite validation studies: OMI, MODIS, MISR, POLDER DC-8/J31 AATS: Does DC-8 lidar-observed convective plume structure predict AATS-observed AOD variability? King Air B200/J31: Compare more extinction profiles (x flights)

Breakout Group on Aerosol Optical Properties & Radiative Effects Future collaborations (beyond the breakout group)  Clocks, evolution of aerosol properties  Ask modelers for their consensus on priorities (Steve Ghan, Greg Carmichael, others). Did they get optics right: mass absorption efficiency, SSA after humidification based on chemistry? What processes are most important? Regional vs global.

Breakout Group on Aerosol Optical Properties & Radiative Effects Future collaborations (beyond the breakout group)  Background lidar, MISR, other vertical profile measurements for March 6 plumes. Collaboration with Bob Yokelson, Ernesto Alvarado  Impact/interaction of aerosols on/with photochemistry (including ozone production), radiation, surface reactions and cloud?

Breakout Group on Aerosol Optical Properties & Radiative Effects Future collaborations (beyond the breakout group)  BC vs. organic effects on SSA spectra (esp UV)  Comparison of AOD from satellite (fine spatial resolution, i.e., 1.5 km) with PM 2.5 concentration measured at RAMA stations. This also includes the lidar information on the aerosol layer heights.

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