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WB57 Midlatitude Cirrus Experiment (WB MidCiX) Aircrew Briefing

WB57 Midlatitude Cirrus Experiment (WB MidCiX) Aircrew Briefing. Overall Science Objectives : Characterize the properties of midlatitude cirrus (primarily non convective) with a very unique payload (particles number and area distribution, mass, extinction, dynamics)

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WB57 Midlatitude Cirrus Experiment (WB MidCiX) Aircrew Briefing

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  1. WB57 Midlatitude Cirrus Experiment (WB MidCiX) Aircrew Briefing Overall Science Objectives: Characterize the properties of midlatitude cirrus (primarily non convective) with a very unique payload (particles number and area distribution, mass, extinction, dynamics) Characterize the current suite of condensed water probes Why? Improve our ability to retrieve cloud properties from NASA satellites Improve our confidence in probes for upcoming tropical cirrus missions Improve our understanding of cirrus

  2. WB57 Midlatitude Cirrus Experiment (WB MidCiX): Aircrew Briefing • Specifics: basic missions….. • Cirrus over the DOE Atmospheric Radiation Measurement (ARM) site in North-central Oklahoma • Cirrus along the flight track of the Terra and Aqua satellites (10:30 and 13:30 local time) • Cirrus • Clouds formed in mountain waves

  3. WB57 Midlatitude Cirrus Experiment (WB MidCiX): Aircrew Briefing • Intend to fly every other day – weather dependent • Nominal Day: • Previous Afternoon (~1400): Determine Primary and secondary objectives for following day • 0600: Update objectives. Hands on instruments • 0830: Brief aircrew • 1000: Take off • 1600: Land • 1630: Debrief

  4. WB57 Midlatitude Cirrus Experiment (WB MidCiX): Aircrew Briefing Cirrus over the ARM site: ARM site has a substantial suite of ground based remote sensors including lidars (eyesafe) and cloud radars that mimic closely the NASA A-Train sensors Cloudsat and Calipso. Goal: Characterize the cirrus passing over these instruments. Flight Plan: Site is an anchor point (36o 36.36’, 97o 29.10’) and wind at cloud level provides a vector. B57 arrives at cloud top, flies 75 mile along wind leg with site at center of leg. 90-270 at leg end and descend 1000 feet. Repeat until cloud base is reached. Spiral up to cloud top. Repeat. Radio Contact on the ground will provide cloud base and top information (123.12 MHz) Primary requirement: Multiple in cloud overflights of ground instruments. Minimum Mission: (CAPS or CPI) & (SPP or VIPS) & (1 of CSI, CLH, Harvard Total Water) & (JLH or Harvard water vapor) Issues: Clouds disappear, get thick, convection, rain on the ground, others?

  5. WB57 Midlatitude Cirrus Experiment (WB MidCiX): Aircrew Briefing Cirrus Along Terra or Aqua Track: Goal: Observe the cirrus that will be imaged by MODIS/MISR/CERES – Important validation opportunity. Plan: Fly parallel to track at small view zenith. Intersect the track 15 minutes prior to overpass and fly 15 minutes beyond overpass time. We provide lat/lon and heading and time to begin track. We will attempt to combine this mission with other objectives. Primary Requirement: Maximum In Cirrus time. Deviate from track to accomplish this requirement. Clear air serves no purpose. Attempt to fly in that part of the layer that appears visually thickest or where the blue sky above gets significantly attenuated – which ever happens first. Minimum Mission: (CAPS) & (SPP or VIPS) & (2 of CSI, CLH, Harvard total water) & (JLH or Harvard vapor) Issues: Aircrew will need to identify most reasonable flight level.

  6. WB57 Midlatitude Cirrus Experiment (WB MidCiX): Aircrew Briefing Cirrus (not ARM or Satellite): Goal: Characterize the properties of Mid Lat Cirrus. Plan: Fly along-wind racetracks. We provide endpoints. Ideally profile the layer with long level legs that step through the layer at 1000 foot increments. Primary Requirement: Maximum In Cirrus time. Deviate from briefed points to accomplish this requirement. Clear air serves no purpose. Of interest: Cloud top and that part of the layer that appears visually thickest or where the blue sky above gets significantly attenuated – which ever happens first. Minimum Mission: (CAPS), (SPP or VIPS), (2 of CSI, CLH, Harvard total water), (JLH or Harvard vapor) Issues: Aircrew will need to identify most reasonable flight level. Cloud top is of interest. Long level legs are optimal after the altitude is determined.

  7. 1989, 1990 NCAR Sabreliner, King Air --Numerous flights March 2000 (with Rogers, DeMott) --9 flights, cloud temperatures -3 to -40°C vertical motion +10 to -9 m s-1 1996 DC8 SUCCESS two flights --cold, warm Wave Cloud Ice Studies

  8. Stair-Step in thicker clouds

  9. Wind 12-25 m s-1 Downwind Edge of Cloud #4

  10. March 17 Flight

  11. WB57 Midlatitude Cirrus Experiment (WB MidCiX): Aircrew Briefing Mountain wave clouds: Purpose: compare condensed water measurements Flight Plan: As shown. We provide lat/lon and heading. Perhaps coordinate with SPEC Lear (they scout the clouds and coordinate) Minimum Mission: (VIPS or SPP) & (CAPS or CPI) & (CSI+ 2 other total water probes) & (JLH or Harvard vapor) Issues: No Clouds.

  12. WB57 Midlatitude Cirrus Experiment (WB MidCiX): Aircrew Briefing Issues: What to watch for and write down or note: Cloud boundaries, optical effects (halos sundogs, etc) Special requests: Transit in stratosphere (under 50k) Water cloud sampling MMS calibration exercises

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