Tag: radiosonde

NOAA Teacher at Sea
Eric Heltzel
Onboard NOAA Ship Ronald H. Brown
September 25 – October 22, 2005

Mission: Climate Observation and Buoy Deployment
Geographical Area: Southeast Pacific
Date: October 14, 2005

Weather Data from Bridge
Temperature: 19 degrees C
Sea level Atmospheric pressure: 1016 mb
Relative Humidity: 70%
Clouds cover: 8/8, stratocumulus
Visibility: 12 nm
Wind direction: 120 degrees
Wind speed: 16kts.
Wave height: 3 – 4’
Swell wave height: 4 – 5’
Swell direction: 120 degrees
Seawater Temperature: 18.3 degrees C
Salinity: 35 parts per thousand
Ocean depth: 4364 meters

Science and Technology Log 

A big day today! We managed to deploy the Stratus 5 buoy.  It was basically the reverse of our retrieval. The buoy was tipped up 45 degrees and the top 35 meters of instruments were hooked together.  Next the mooring was attached to the buoy and it was placed in the water with a crane. This phase was done off of the portside of the fantail.  We held the wire that was attached to the buoy and let it swing out behind the ship.  Then using a large winch we would play out more of the cable, stop, secure the line, and then attach the next instrument.  Consider the fact that if we were to lose hold of the mooring we could lose the whole works into 4000 + meters of ocean water.  It’s not like working on land where if you drop something, you say whoops and pick it up again.  If that happens on the ship the thing you drop may well go over the side.  Serious Whoops!

Once all of the instruments were attached we started paying out nylon and polypropylene line. This was accomplished by using an H-bit to run the line through.  The line was in 4’ x 4’ x 4’ boxes and trailed out into the ocean as the ship moved forward at just over one knot. When we got to the end of the line it was time to attach the new acoustic releases so that this buoy can be recovered next year.  Then it was time for the big splash. The mooring was attached to the anchor which was made up of three iron disks, twelve inches thick and three feet in diameter.  The anchor’s weight is 9000 pounds. The anchor was sitting on a steel plate and the stern of the fantail.  A crane picked up the forward edge of the plate and tipped the anchor into the ocean.  The splash from the six-foot drop to the water went twenty feet in the air.  The anchor started the trip to the bottom dragging all of the mooring and the buoy.  The falling anchor pulled the buoy at about four knots towards the anchor location.  Excited cheers went up on the fantail. The Stratus 5 buoy had been successfully deployed!

Instruments Deployed (top 450 meters)

Deployed on the mooring line beneath the buoy: MICRO CAT temperature, salinity SEA CAT temperature, salinity Brancker temperature, salinity VMCM direction, velocity of water flow NORTEK acoustic Doppler current profiler T-POD   temperature logging device SONTEK acoustic Doppler current meter RDI ADCP acoustic Doppler current profiler (125 m) SDE 39 temperature logging device Acoustic release just above the anchor

On the buoy: (this information is transmitted 4 times a day) Atmospheric pressure, Air temperature, Wind speed and direction, Relative humidity, Precipitation, Long wave radiation, Short wave radiation, Sea surface temperature and salinity.

You may notice that many of the instruments on the mooring measure the same thing.  This redundancy is intentional guaranteeing verifiable data.  There are two complete meteorological systems on the buoy.

Response to Student Questions 

Does the stratus layer extend to the land?

After questioning the senior scientists about this the answer is yes.  We are at about 20 degrees south. Here there is a daily fluctuation in the cloud cover.  It often dissipates during the afternoon as a result of warming by the sun.  Apparently the coast of northern Chile often has a cloud layer that also dissipates during the day.  This can be low-lying enough to be fog. As you travel a few miles inland and up in elevation you are no longer under the stratus layer.

Does the stratus layer affect El Nino?

Ocean and atmosphere constantly influence each other.  I have to do more inquiry to give a solid answer to this question.

Note: There is some confusion about the labels being used for the buoy and the cruise.  This is the sixth Stratus Project cruise which is deploying the fifth Stratus buoy.  Hence, the Stratus 6 cruise is recovering the Straus 4 buoy and deploying the Stratus 5 buoy.

NOAA Teacher at Sea
Eric Heltzel
Onboard NOAA Ship Ronald H. Brown
September 25 – October 22, 2005

Mission: Climate Observation and Buoy Deployment
Geographical Area: Southeast Pacific
Date: October 9, 2005

Weather Data from Bridge

Temperature: 25.5 degrees C
Clouds cover: 6/8, stratus, altocumulus
Visibility: 12 nm
Wind direction: 245 degrees
Wind speed: 13kts.
Wave height: 3 – 5’
Swell wave height: 3 – 5’
Seawater Temperature: 28.7 degrees C
Sea level Atmospheric pressure: 1005 mb
Relative Humidity: 82%

Science and Technology Log 

After Dr. Lundquist and I have a successful radiosonde launch we return to the computer terminal and watch the measurement data come in.  My favorite display is a color-coded graph showing temperature, dew point, and relative humidity graphed against the altitude of the radiosonde. The main area of study is taking place where we are in the eastern Pacific off the coast of northern Chile.  In this area there is a large, semi-permanent layer of stratus clouds.  The effects these clouds have on the ocean temperature, and vice versa, is one of the reasons for choosing this area to study.

As the balloon ascends from the ship the temperature cools at the dry adiabatic rate. The dew point goes down but not as rapidly.  Usually at an elevation of about  600 meters the dew point and temperature intersect.  On the same screen green line showing relative humidity hits 100% as we would expect.  This marks the base of the cloud layer.

As the radiosonde ascends another 200 to 400 meters the temperature shoots way up, as much as 8 degrees C.  This indicates the top on the cloud layer where the sun is shining brightly. As the balloon continues to ascend the temperature once again cools consistently at the dry adiabatic rate.  It’s about negative forty degrees C at an altitude of 20 kilometers.  In this part of the atmosphere the relative humidity approaches zero and the dew point stays well below the air temperature.  This suggests the upper air is descending and is stable. The bottom 800 meters is referred to as a marine boundary layer.

Despite the constant cloud cover there is very little precipitation in this area.  Temperatures at the ocean level are surprisingly cool as evidenced my most of the crew wearing long pants and jackets or sweatshirts.  Atmospheric and oceanic data in this area are very sparse. One goal of the Stratus Project is to gather more information so we can better understand the interrelationships between ocean and atmosphere.

Personal log

As I write this I am on my watch in the main science lab.  I’m preparing to launch a Drifter in about 15 minutes and I will launch a weather balloon at 13:00.  It’s really fun to throw things into the ocean and release balloons into the atmosphere and see where they go.

Our ETA at the Stratus mooring site is 17:30.  We are approaching the end of southerly leg of our cruise. There are about six days of work scheduled at the buoy site.  It should be interesting.

NOAA Teacher at Sea
Eric Heltzel
Onboard NOAA Ship Ronald H. Brown
September 25 – October 22, 2005

Mission: Climate Observation and Buoy Deployment
Geographical Area: Southeast Pacific
Date: October 8, 2005

Weather Data from Bridge

Temperature: 25.5 degrees C
Clouds cover: 6/8, stratus, altocumulus
Visibility: 12 nm
Wind direction: 245 degrees
Wind speed: 13kts.
Wave height: 3 – 5’
Swell wave height: 3 – 5’
Seawater Temperature: 28.7 degrees C
Sea level Atmospheric pressure: 1005 mb
Relative Humidity: 82%

Science and Technology Log 

I’ve been working with the meteorological team from NOAA in Boulder, Colorado. I’ve been teamed with Dr. Jessica Lundquist to manage the 13:00 weather balloon launch. Balloons are launched four times a day at intervals of six hours.  A balloon carries an instrument called a radiosonde to a height often exceeding 20 kilometers.  Eventually the balloon ruptures and the instrument and spent balloon fall to earth.

When preparing a radiosonde we take the battery pack and add water to activate it. As the battery is soaking, the sonde is attached to the computer interface/radio receiver, and it is activated and calibrated.  It is necessary to have real-time weather measurements to input into the sonde so it has a comparison to ensure accuracy.  A radio transmitting frequency is selected then the sonde is detached from the interface and attached to the battery.  While it is still in the lab, we make sure that data is being transmitted.  If all of this goes correctly the radiosonde is set to launch.

We take the activated radiosonde out to the staging bay, which looks a bit like a garage. There are two overhead doors, a workbench, and bottles of helium.  We inflate the balloon with helium to a diameter of about five feet.  When it is inflated we close the balloon with a zip-tie, then attach the radiosonde by its hook, and close it with another zip-tie. We call the Bridge and let them know we are about to launch a balloon.

Now comes the tricky part, walking out on the fantail of the rolling ship carrying a large balloon in one hand and the radiosonde in the other.  Today there 16-knot winds coming from the SE and a wind generated by the ship’s speed of an additional 10 knots from due south.  To complicate matters further, the superstructure of the ship blocks the wind and creates erratic eddies. We check the wind direction and decide on which corner of the fantail will give us the cleanest launch.  Walking aft, the balloon is buffeted by the wind. It pulls and pushes you in various directions while you try to maintain balance on the heaving deck.  When you reach the railing, you hold your hands out and release the balloon and radiosonde. If it clears the A frame and the other equipment you stand and watch your balloon ascend until it enters the cloud layer and disappears.  We call the Bridge and let them know the balloon is away.

Now we return to the Lab to check that our sonde is sending out data.  Measurements of temperature, relative humidity, and atmospheric pressure are taken and sent back every two seconds. The GPS tracking device allows us to know wind speed, wind direction, altitude, and location of the radiosonde.  The measurements of temperature and relative humidity allow the computer to calculate the dew point.  Data streams in until the balloon reaches an elevation where the atmospheric pressure of  about 30, the balloon fails and the radiosonde falls to earth. Tomorrow: More about radiosonde information.

Questions to Consider 

-What is an eddy?

-What will happen to the volume of the balloon as it rises in the atmosphere?

-Why does atmospheric pressure decrease as elevation increases?

-What is the relative humidity when dew point and air temperature are the same?

-What is the adiabatic rate?

-What is a temperature inversion?

Personal log

I am a Pollywog.  Yes, that’s right. I’m one of those slimy little creatures with a spherical body and a tail. At least that’s what the Shellbacks tell us.  A pollywog is a person who has never sailed across the equator and gone through the ceremony and initiation to move onward. Shellbacks are people who have been through these rites.  I made the mistake of admitting that I don’t know what a Shellback is.  I fear that admission will come back to haunt me.  Initiation is approaching. I don’t know what I’ll have to do. I’ll keep you posted.