UNIVERSITY OF WASHINGTON'S CONVAIR-580 FLIGHTS FOR SAFARI-2000

Date: 14 August 2000

UW Flight Number: 1812

Goals of Flight: Profile northwest of Johannesburg (CV-580 alone).

Period of Flight (engines on to engines off: UTC): 1216-1505

Location: From Lanseria, South Africa, to about 80 miles northwest of Johannesburg, which was location for vertical profile measurements. Return to Lanseria.

Weather Conditions: Widely scattered cumulus fractus clouds.

Accomplishments:

  1. Vertical profile of boundary layer (well mixed) and into free troposphere.

  2. Measurements in lower free troposphere.

  3. Full set of chemistry and physical measurements at 7,000 ft.

  4. Sunphotometer measurements at 200 ft.

  5. Climbed to 9,700 ft.

Main Instrument Malfunctions: CAR not "talking" to Goddard computer

Flight Scientist: Peter Hobbs

Approx. UCT time

(UTC = local time minus 2 hours)

Activity

1229

Take off from Lanseria (north of Johannesburg), South Africa.

1229-1241

Climb to 10,500 ft for transit to research site (80 nm northwest of Johannesburg). Boundary layer well mixed.

1244 -1255

Climb to free troposphere (11,500 ft). Some measurements in free troposphere.

1255-1304

Descended to 7,000 ft.

1304-1426

Intensive chemical and physical measurements at 7,000 ft (all filters, 1 can, DMPS, humidigraph, BOSS, Buseck grids). Estimate of single scattering albedo 0.85; should be representative of boundary layer.

1426-1431

Descend to 500 ft agl at 500 ft/min. Run at 500 ft for sunphotometer measurements (optical depth = 0.15).

1434-1443

Climb to 9,000 ft at 1000 ft/min.

1443-1456

Return to Lanseria. Intercepted (by accident) smoke plume from flaming grass fire (seen in CN and SP measurements).

1456-1503

Descent to Lanseria.

1503

Land.

1505

Engines off.

END