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Atmospheric Structure Analysis Along 20°S via NSF C-130 Mission Reports

Explore comprehensive data from multiple missions to study MBL, aerosols, clouds at 20°S parallel. Collaborative research including POC drift missions and pollution surveys. Utilizing RAF instruments like Microphysics, Wyoming Cloud Radar, and special chemistry tools. Analyze synoptic variability, cloud dynamics, and pollutant transport. Rich dataset offers insights on boundary layer depth, cloud characteristics, and air pollution patterns in the region.

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Atmospheric Structure Analysis Along 20°S via NSF C-130 Mission Reports

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  1. NSF C-130 Platform Report Robert Wood • (a) 20oS Cross-Sections [4 full missions+5 partial missions] • - to characterize structure of MBL, aerosols, clouds along the 20oS parallel from 72-85oW • - collaborative (RHB, BAe-146, Do-228, G-1) (b) POC Drift missions [5 missions including 1 POC Lagrangian with BAe-146] - investigate structure of boundary betweenclosed and open cellular stratocumulus (c) Pollution Surveys [2 missions total] - coast-parallel surveys to 30oS to study how pollutants are transported into the MBL MISSIONS • RAF instruments: • Microphysics, Turbulence, Thermodynamics suite, Radiation • Special Remote sensing: • Wyoming Cloud Radar (zenith+nadir+slant), Cloud Lidar (zenith), Microwave radiometer (GVR, 183 GHz, zenith) • Special Chemistry/aerosols/clouds: • CCN, CVI, Streakers, Giant CCN, Special CN counters (+ultrafine), LDMA, RDMA, Aerosol Mass Spec, volatility, nephelometer, SP2/PSAP, DMS/SO2,Cloud water collector, CO/O3, fast FSSP INSTRUMENTS Photo courtesy Carly Calvin, NCAR

  2. 2.0 1.6 1.2 0.8 20oS Missions Boundary layer depth [all 20oS missions] remarkable synoptic variability 20oS/85oW height [km] 20oS parallel 86 82 78 74 70oW Wyoming cloud radar – widespread drizzle 2.5 2.0 1.5 1.0 0.5 0 Relative humidity – very dry free troposphere height [km] 85 80 75 70oW

  3. POC Missions 10 km Optically thin cell centers • Lowest CN concentration ever measured • Remarkable contrasts in microphysics and cloud dynamics across POC boundary [aerosols, drizzle, cloud structure and morphology, CO and O3] • Ultraclean clouds in optically-thin cloud centers • Quasi-linear boundary cells with copious drizzle scavenge aerosols Optically thick cell walls

  4. [SO2] ppt Pollution survey missions Elevated SO2 layers entraining into MBL RF12, November 11th 2008 Cloud Diurnal flushing of continental air Santiago

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