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November 2005, ARM-TR-069

Surface Temperature Humidity Reference System

1. Purpose

The Surface Temperature and Humidity Reference (SURTHREF) System is intended to provide

accurate reference values of ambient temperature and relative humidity (RH) for comparison with

radiosonde pre-launch values.

2. References

ECR-00319 (Modify balloon Borne sounding system (BBSS) surface reference system at the

Southern Great Plains [SGP] site)

ECO-00319 (Modify the Chilled Mirror/BBSS surface reference system at the SGP site)

3. Components

The components of the SURTHREF system are as follows:

• Meteorological Instrument Shelter. The shelter is a standard NWS “Stevenson screen”

modified to allow for operator access on two sides. The shelter dimensions are 20 inches

by 30 inches by 34 inches.

• Instrument Shelter stand.

• Aspirated Chamber. The chamber is fabricated from white polypropylene plastics. Its

dimensions are 11 inches by 13 inches by 18 inches (volume = 1.49 feet

). One end is

open and covered with a removable plate containing a 7-inch by 7.5-inch access port.

Two muffin fans, each rated at 115 cfm are mounted at the far end. The fans produce an

estimated face flow of 10.49 fps or 3.2 m/s. The chamber has six sensor ports on its top

surface to accommodate standard temperature and RH probes.

• Sonde positioning platform. A polypropylene platform is mounted approximately 1 inch

above the bottom of the aspirated chamber. The platform is equipped with moveable

guides for positioning radiosondes. A user-controlled switch is mounted on the side of

the Aspirated Chamber to indicate when a radiosonde is placed in or removed from the

chamber.

• Temperature and RH probes.

o Vaisala HMP45D probes – four each, one spare.

o Rotronics MP100H probes – four each, one spare.

o See Appendix G, Wiring Diagrams.

• Data logger. The system uses a Campbell Scientific Instruments CR23X data logger.

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