Jetstream 31 (J31) in INTEX-B/MILAGRO. Campaign Context: In March 2006, INTEX-B/MILAGRO studied pollution from Mexico City and regional biomass burning,

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Jetstream 31 (J31) in INTEX-B/MILAGRO

Campaign Context: In March 2006, INTEX-B/MILAGRO studied pollution from Mexico City and regional biomass burning, including sources, transport, transformations, and effects. MILAGRO included many measurements in and downwind of Mexico City, 5 A/C based in Veracruz, MX and 1 in Houston, TX.

Campaign Context: In March 2006, INTEX-B/MILAGRO studied pollution from Mexico City and regional biomass burning, including sources, transport, transformations, and effects. For INTEX-B/MILAGRO the J31 was equipped to measure solar energy and how that energy is affected by the above pollution and Earth's surfaces. J31 Overview: MILAGRO included many measurements in and downwind of Mexico City, 5 A/C based in Veracruz, MX and 1 in Houston, TX.

Because solar energy drives Earth's climate, the J31 suite of measurements helps show how changing atmospheric and surface properties can change the climate

SCIENCE GOALS, J31 in INTEX-B/MILAGRO: Aerosol, Water Vapor, Cloud, & Surface Properties and Radiative Effects Characterize the distributions, properties, and effects of aerosols and water vapor advecting from Mexico City and biomass fires toward and over the Gulf of Mexico –Aerosol Optical Depth And Extinction Spectra ( nm) –Water Vapor Columns and Profiles –Aerosol Radiative Impacts: In Clear Sky (Direct Effect) & Via Clouds (Indirect Effect) Test the ability of Aura, other A-Train & Terra sensors, & airborne lidar to retrieve aerosol, cloud, and water vapor properties Characterize surface spectral albedo and bidirectional reflectance distribution function (BRDF) to help improve satellite retrievals Quantify the relationships between the above and aerosol amount and type MexicoCity Veracruz

J31 in INTEX-B/MILAGRO: Payload Ames Airborne Tracking Sun- photometer (AATS) Solar Spectral Flux Radiometer (SSFR) Research Scanning Polarimeter (RSP) Cloud Absorption Radiometer (CAR) Position & Orientation System (POS)Met Sensors & Nav/Met Data System (RSP)

AATS-14 CAR RSP SSFR NavMet POS J31 in INTEX-B/MILAGRO: Instrument Locations

J31 Science Objectives by Sensor 1. Independent of other J31 sensors AATS Characterize horizontal & vertical distributions of aerosol optical depth (AOD) and extinction spectra ( nm), water vapor columns and density Validate A-Train & Terra products (CALIPSO, OMI, MODIS, POLDER, TES, AIRS, MISR) Test closure with remote and in situ sensors on other platforms, including airborne lidar Test chemical transport models using AOD & extinction profiles Assess regional aerosol radiative effects SSFR Retrieve cloud droplet radius, optical depth, and liquid water path Compare with satellite retrievals (MODIS) and remote & in situ sensors on the surface and other aircraft (incl. microwave, radar, optics, etc.) Compare spectral irradiance from SSFR to that from 3-d model using MODIS input Provide surface spectral albedo to help improve satellite aerosol retrievals Determine column solar radiative boundary conditions for modeling studies

J31 Science Objectives by Sensor 1. Independent of other J31 sensors Estimate direct and indirect effects of aerosols on radiative forcing of climate Evaluate aerosol and cloud retrieval algorithms for the NASA Glory mission Aerosol Polarimetry Sensor. Validate aerosol and cloud products from A-train & Terra (MODIS, MISR, POLDER on Parasol, OMI, CLOUDSAT) RSP CAR Measure bidirectional reflectance distribution function (BRDF) for variety of surfaces (e.g., urban center, ocean, cloud, uniformly vegetated soil) at different sun angles & altitudes Retrieve BRDF and aerosol properties by combining CAR with AERONET Validate satellites and inter-compare with in-situ measurements (size distribution, SSA, albedo, etc.)

J31 Science Objectives by Sensor 2. Objectives that combine data from 2 or more J31 sensors AATS-SSFR RSP-AATS Derive aerosol radiative forcing from simultaneously measured radiative flux and AOD gradients Study effect of over-cloud AOD on cloud property retrievals by SSFR and satellites Study Influence of aerosols on cloud radiative forcing: AATS-14 extinction above cloud Derive spectra of aerosol absorbing fraction (1-SSA) from spectra of radiative flux and AOD in thick polluted layers Validate RSP retrieved spectral optical depth Atmospheric correction of low altitude measurements to provide accurate surface polarized BRDF

J31 Science Objectives by Sensor 2. Objectives that combine data from 2 or more J31 sensors RSP-AATS-SSFR CAR-AATS  Retrieve BRDF and aerosol optical properties simultaneously from combined data sets: CAR, AATS, and AERONET. Evaluate remote sensing methods (RSP + lidar) for determining the aerosol radiative forcing profile against the measured spectral optical depth and radiative flux profile  Extend CAR retrieval algorithm to include RSP, AATS, AERONET. CAR-AATS-RSP

To accomplish these goals and objectives we had: 19 Days (3-21 Mar) 45 Flight Hours

To accomplish these goals and objectives we had: 19 Days (3-21 Mar) 45 Flight Hours A/C & Instruments performed very well A/C available to fly every day Instruments had very high data capture rates

J31 in INTEX-B/MILAGRO: Flight Tracks

J31 Science Flights out of Veracruz in MILAGRO/INTEX-B Flt No. Date, 2006 TrackComments VER 01 3 Mar Gulf of Mexico near VER & Tampico Terra & A-Train near overpass times, clouds & clear. Profile, RSP legs, CAR circles. VER 02 5 Mar Gulf of Mexico NE of VER Terra, clear. Profile, transects, SSFR fluxes, RSP legs, CAR circles. VER 03 6 Mar Mexico CityTerra (MISR LM), clear. Racetrack stepped profile, SSFR fluxes, RSP legs, CAR racetracks near T0 & airport under King Air. VER 04 8 Mar Aborted on takeoff roll: bird strike VER Mar Gulf of Mexico NE of VER Terra (MISR LM + MODIS), King Air and C-130. Clear + cirrus. 2 profiles, RSP legs. VER Mar Gulf of Mexico NE of VER A-Train in MODIS Aqua glint-free. Profiles, SSFR fluxes, CAR circles, RSP legs VER Mar Mexico CityCAR circles for urban reflectivity. Profile w 18Z sonde at VER on return.

J31 Science Flights out of Veracruz in MILAGRO/INTEX-B (cont'd) Flt No. Date, 2006 TrackComments VER Mar Gulf of Mexico N of VER Terra, King Air. Clear + clouds. Profiles, RSP legs. Near AERONET Tampico & Tamihua VER Mar Gulf of Mexico N of VER Terra MODIS/Glory glint scenario. VER Mar Mexico CityTerra (MISR LM), cirrus. Stepped profile, SSFR fluxes, RSP legs, CAR circles at T0 + other point under King Air. VER Mar Gulf of Mexico N of VER Aqua, aerosols + cloud experiments. Profiles, SSFR fluxes, RSP legs, CAR circles. VER Mar Toward Mexico City, then Gulf near VER Ci over MC caused diversion to Gulf. Profiles, SSFR fluxes, RSP legs, CAR circles w Aqua. VER Mar T2 & T0 (Mexico City) Profiles, RSP & SSFR legs with Aqua, POLDER, Aura, DC-8 at T2. Profiles and legs at T0 VER Mar Gulf of Mexico N of VER H 2 O sonde comparison on takeoff. Glint experiment scrubbed by Ci.