The University of Washington Convair-580 Research Aircraft is maintained and operated by the Cloud and Aerosol Research Group within the Department of Atmsopheric Sciences.

Instruments aboard the University of Washington's Convair-580 research aircraft in the IMPROVE field studies.

(a) Navigation and Flight Characteristics

Parameter Measured

Instrument Type

Manufacturer/Model

Performance

Latitude, longitude, ground speed, horizontal winds

GPS and Trimble TANS Vector

Trimble TANS Vector

No major problems.

True airspeed

Variable capacitance

Rosemount Model F2VL 781A

No major problems in IMPROVE-I. Iced over on some IMPROVE-II flights.

Heading

Standard GPS

Trimble TANS Vector

No major problems.

Pressure

Variable capacitance

Rosemount Model 830BA

No major problems.

Altitude above terrain

Radar altimeter

Bendix Model ALA 51A

No major problems.

Altitude

Standard GPS

Trimble TANS Vector

No major problems.

Pitch and roll

Standard GPS

Trimble TANS Vector

No major problems.

(Cont.)

Table (continued)

(b) General Meteorological Parameters

Parameter Measured

Instrument Type

Manufacturer/Model

Performance

Total air temperature

Platinum wire resistance

Rosemount Model 102CY2CG and 414 L Bridge

Did not provide reliable measurements in IMPROVE-I.

Static air temperature

Reverse-flow thermometer

In-house

No major problems.

Dew point

Cooled-mirror dew point

Cambridge System Model TH73-244

No major problems.

Absolute humidity

IR optical hygrometer

Ophir Model IR-2000

Values sometimes too high in IMPROVE-I. No major problems in IMPROVE-II.

UV hemispheric radiation, up and down

Diffuser, filter (0.295 to 0.390 µm)

Eppley Lab. Inc. Model TUVR

Some noisy signals in IMPROVE-I.

VIS-NIR hemispheric radiation, up and down

Eppley thermopile (0.3 to 3 µm)

Eppley Lab. Inc. Model PSP

Some noisy signals in IMPROVE-I.

Surface radiative temperature

IR radiometer 1.5 FOV (8 to 14 µm)

Omega Engineering OS3701

No major problems when aircraft was close to surface.

Video image

Forward-looking camera and time code

Ocean Systems Splash Cam

No major problems.

(Cont.)

Table (continued)

(c) Aerosol

Parameter Measured

Instrument Type

Manufacturer/Model

Performance

Size spectrum of particles

35 to 120 deg light-scattering

PMS PCASP-100X

No major problems.

Size spectrum of particles

Forward light-scattering

PMS FSSP-100

No major problems.

Number concentration of particles

Condensation particle counter

TSI Model 3022A

Problems on some flights in IMPROVE-II.

Number concentration of particles

Condensation particle counter

TSI Model 3025A

Problems on some flights in IMPROVE-II.

Light-scattering coefficient

Integrating 3-wavelength nephelometer with backscatter shutter

MS Electron 3W-02

Noisy in some of IMPROVE-I flights.

Cloud condensation nucleus spectra

Thermal diffusion chamber

University of Wyoming/NCAR

Not aboard for IMPROVE-I. No major problems in IMPROVE-II.

(Cont.)

Table (continued)

(d) Cloud Physics

Parameter Measured

Instrument Type

Manufacturer/Model

Performance

Cloud and precipitation particle imagery

Digital camera

SPEC Inc. Model CPI-230

Not installed on first four flights of IMPROVE-I. Did not work well on IMPROVE-II flights.

Size spectrum of precipitation particles

256 photodiode CCD array

SPEC Inc. HVPS

No major problems.

Size spectrum cloud particles

Forward light-scattering

PMS FSSP-100

No major problems.

Size spectrum of cloud and precipitation particles

Diode occultation

PMS OAP-200X (1D-C)

Concentrations may be low on some flights.

Images of cloud particles

Diode imaging

PMS OAP 2D-C

No data for first four flights in IMPROVE-I.

Liquid water content

Hot wire resistance

Johnson-Williams

Data usable through ~0910 UTC (when aircraft was struck by lightning) on UW Flight 1859.

Liquid water content; particle surface area; effective droplet radius

Optical sensor

Gerber Scientific Ins. PVM-100A

No major problems.

Liquid water content

Hot wire

Droplet Measurement Technologies

Excessive drift in low liquid water contents (LWC) clouds and in clear air, but good for high LWC in IMPROVE-I. Unreliable data in IMPROVE-II.

(Cont.)

 

Table (continued)

(e) Remote Sensing

Parameter Measured

Instrument Type

Manufacturer/Model

Performance

Radar reflectivity

Pulsed 35 GHz radar

In-house

Installed but data not recorded until end of UW Flight 1852 in IMPROVE-I. Not installed for IMPROVE-II.

Weather radar

Pilot's radar

Bendix/King

Data not recorded.