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DC-8 SEAC4RS Payload & Capabilities Hanwant Singh, ARC

DC-8 SEAC4RS Payload & Capabilities Hanwant Singh, ARC. Multiple flight clearances needed. NP. TB. IN. BD. MM. IN. TL. DC-8 4 Engine Jet Ceiling 12.5 km (0.5-41Kft) Range 10000 km True air speed 250-450 knts Turning radius 15-30 km (<10° BA) Nominal flights 8-9 hours. UTAPAO.

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DC-8 SEAC4RS Payload & Capabilities Hanwant Singh, ARC

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  1. DC-8 SEAC4RS Payload & CapabilitiesHanwant Singh, ARC Multiple flight clearances needed NP TB IN BD MM IN TL • DC-8 • 4 Engine Jet • Ceiling 12.5 km (0.5-41Kft) • Range 10000 km • True air speed 250-450 knts • Turning radius 15-30 km (<10° BA) • Nominal flights 8-9 hours UTAPAO BB CB VN ML IA Assumes 8 h DC-8 round trip with some loiter time

  2. DC-8 SEAC4RS Payload (26 instruments)

  3. DC-8 SEAC4RS Payload Mission Mgr. Console HD-SP2 DASH-SP AOP PALMS AMS ISAF GT-CIMS LARGE TD-LIF CIT-CIMS DIAL Navigation DFGAS CSDL-CL PTR-MS SSFR BBR AATS-14 (4STAR) WAS MS CAFS MMS SPEC AVOCET APR-2 DACOM DLH SAGA O3/NOy DIAL HCHO

  4. Instrument channels & probes • AOP (3 instruments): (1) cavity ring-down extinction spectrometer, (2) photo acoustic absorption SPTR, and (3) aerosol size SPTR • GT-CIMS (2 instruments): (1) SF5- CIMS for SO2 (HCl, HNO4) and (2) I- CIMS for PANS • LARGE: Multiple probes • 75 organics on the DC-8 • PTR-MS: CH3CN, acetone, methanol, acetaldehyde, benzene, toluene, isoprene, pinenes, MVK • CIT-CIMS: HCN, CH3OOH, CH3COOH, HCOOH, some oxygenated carbonyls • GT-CIMS: PANs {RC(O)OONO2} • WAS: C2-C10 NMHC, C1-C5 RONO2, C1-C2 halocarbons, OCS • AMS: Organic aerosol

  5. Observed groups on the DC-8 • Tracers: CH3CN, HCN, CO, CO2, SO2, halocarbons (CH3I/CHBr3), NOy, some NMHC, aerosol • Photochemical/O3 precursors: O3*, NO2,HNO3, HCHO, NO, PANs, HNO4, OVOC,C1-C10 HCs, H2O2, CH3OOH • Greenhouse gases: CO2, CH4, N2O, O3, H2O • Aerosol composition: SO4, NO3, BC, NH4, OA • Aerosol properties: CN, hot-CN, CCN, hygroscopicity, absorption, extinction, scattering, clouds/precipitation • Radiation:Actinic fluxes, AOD, solar and IR irradiances • *Duplicate DC-8 measurements in red

  6. Downlinking DC-8 data for flight coordination • Many DC-8 PIs are agreeable to transmitting data to the ground but will need help to facilitate this process. Most have not done it before. • Need to optimize this activity taking into account bandwidth constraints and usefulness for ground planners. • Present feasible candidates are: • DIAL curtains • CO, O3, NOy, H2O • Hot/cold FCN, SO4 • State variables (T, P, Lat/Long, Alt, 3-D winds) • Feasible but lower priority (CH4, SO2, PAN, BC, OA, CO2, NO, total-SCAT, UFCN, AOD etc.)

  7. Examples of gas & aerosol composition from DC-8 Aerosol Scat O3

  8. Some comments & observations/DC-8 • Excellent DC-8 range & state of the art gas/aerosol composition package to address main SEAC4RS goals of; • Megacity/BB pollution outflow and its evolution; • Inflow, outflow & processing by deep convective systems; • Asian monsoon anticyclone composition and chemistry; • Cirrus layer heating rates & UTLS influences • SAT Cal/Val • Coordinated platform flights will be central to achieving SEAC4RS objectives • SEAC4RS goals will benefit from: • Smooth DC-8 in flight communications with ground and possibly other A/C • Sorting data transmission and instrument inter-comparison issues during DC3 • Suitcase flight opportunities and/or extra long flights??

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