The objectives of the meteorological component of the summer R/V Professor Kromov hydrographic cruise were to make high quality shipboard measurements of wind speed and direction, barometric pressure, relative humidity, air temperature, sea surface temperature, short wave radiation, long wave radiation and precipitation. In addition, 10 minute GPS positions were recorded to determine the ship?s speed during the cruise. The meteorological equipment was shipped to Korea and the instruments were then mounted on the Russian ship in Pusan. This report describes the instruments used during the cruise and how these instruments were mounted on the R/V Khromov. R. Limeburner from the Woods Hole Oceanographic Institute (WHOI) installed the meteorological instruments on the ship in Pusan, Korea and Alexey Sherebinin and Igor Filippov from the Far Eastern Regional Hydromet Research Institute, Vladivostok assisted in the installation.

Log

The R/V Professor Kromov arrived in Pusan July 18, 1999 to load hydrographic equipment and personnel from the Scripps Institute of Oceanography (SIO) and meteorological instruments from WHOI. The ship tied up at the Yongho Pier in Pusan near the R/V Revelle and equipment was transferred between ships on July 19, 1999. The Kromov?s heading at the Yongho Pier was 224° magnetic. Magnetic variation is 6° 4?.The meteorological recorders were first given new batteries, then clocks were reset and the sensors were precruise tested and mounted aboard the Kromov in Pusan prior to the cruise.

The precipitation, barometric pressure and GPS recorders were mounted on brackets on the observation deck above the bridge on the starboard side of the ship. The location of these sensors is not critical and the instruments are readily accessible for testing and redeployment. See Figure 1 below.

Figure 1. Location of the precipitation, barometric pressure, GPS battery and GPS recorder (left to right) on the deck above the bridge of the R/V Professor Khromov.
 
 

The relative humidity/air temperature recorder is more sensitive to the elevated deck temperatures of the ship during sunny days and this instrument was located about 3.5 m above the deck over the bridge just aft of the large radar support structure. See Figure 2.

 
 
 
 

The long and short wave radiation recorders were also located on the deck above the bridge. These 2 instruments were mounted on the top of a 10? x 2" x 2" fiberglass channel bar braced and guyed at the forward end of the deck. See Figure 3 below.
 
 
 
 

Figure 3. Location of the long wave and short wave radiation recorders on the deck above the bridge.
 
 

The wind speed and direction recorder was mounted above the main radio antenna mast above the bridge. The instrument was first attached to the end of a 10? x 2" x 2" fiberglass channel bar and the lower half of this bar was secured to the ship?s main mast with 2 aircraft straps and 3 hose clamps. An additional aircraft strap guyed the wind recorder to ship?s roll. The wind sensor was mounted 22.5 m above the waterline and 11.5 m above the upper deck. See Figure 4.

Figure 4. Location of the wind speed/direction recorder on the ship?s mast.

Finally, the sea surface temperature recorder was located in the bow of the ship about 1 m below the waterline. The temperature sensor attaches to the hull interior with a magnet. The sensor is then insulated to the air temperature.

Data Description

The meteorological instruments logged 1 minute average data. The GPS recorder logged position data every 10 minutes. The instrumentation was tested after being mounted on the ship and the following figures summarize the short 1 day tests.
 
 

Sample of GPS data

1999/07/20,22/41/04,+35.133,+129.120

1999/07/20,22/51/44,+35.133,+129.121

1999/07/20,23/01/20,+35.134,+129.120

1999/07/20,23/12/00,+35.133,+129.120

1999/07/20,23/21/36,+35.134,+129.119
 
 
 
 

Notes:

The PRC test was made by pouring bout 25 cm^3 into the rain collector. This indicated precipitation of 17 mm/hr.

The SST recorder battery became very hot after first being powered up. The usually short circuit was located where the 12 vdc wires connect to their connector. The termination was repaired as best as possible and a new battery was placed in the SST sensor.

All units were powered up 7/19/99 between 0000 - 0309 z.

Acknowledgements

The successful installation of the meteorological recorders was dependant on the knowledgeable support of Alexey Sherebinin and Igor Filippov of the Far Eastern Regional Hydromet Research Institute, Vladivostok. Lynne Talley (SIO) also provided excellent coordination of the meteorological installation with the Russian scientists and ship?s officers.