DOC PREVIEW
UW-Madison ATMOCN 100 - Guest Lecture and Some Current Weather Notes

This preview shows page 1-2 out of 6 pages.

Save
View full document
View full document
Premium Document
Do you want full access? Go Premium and unlock all 6 pages.
Access to all documents
Download any document
Ad free experience
View full document
Premium Document
Do you want full access? Go Premium and unlock all 6 pages.
Access to all documents
Download any document
Ad free experience
Premium Document
Do you want full access? Go Premium and unlock all 6 pages.
Access to all documents
Download any document
Ad free experience

Unformatted text preview:

Lecture 6Outline of Last Lecture I. Website of the day NotesII. Surface PressureIII. HumidityIV. Vertical Structure of Atmospheric Temperature Outline of Current Lecture II. Guest lecture notesIII.Information for Balloon LaunchingIV.Weather for Friday notesCurrent LectureResearch Balloon Soundings (Guest Lecture)Erik OlsonSpace Science and Engineering CenterUW-MadisonWe are going to do the balloon launch at Engineering!Measurements are taken at equal measurements around the United States. (Guest lecture, not sure if we need to know for tests)Sensor and Retrieval Algorithm TestingRetrieval: This means not directly measuring the data, it means trying to guess what the temperature is in the atmosphere. The instrument is used to measure at the surface and gets data about once a minute. Sometimes instruments are measured on airplanes or using satellites. Atm Ocn 100 1st EditionThe weather company sets up wind turbines to test whether specific places are preserving the flow of atmosphere as well as they can. Wind profiler is used to measure directly if the flow is as best as possible.They compare retrieved profiles to sounding…Profiles are used to remove water vapor effects…Which then provide accurate profiles for use in retrievals…Aircraft Sensor Calibration (these are sensors that are on airplanes used to gather data)Two projects are:TAMDAR-Memphis, TNWVSS- Louisville, KT and Rockford, ILThese sensors measure moisture and temperature on airplanes.Problem is that the only useful data from an aircraft is when the aircraft is taking off and when it is landing. A sensor is more useful if put it on a commuter aircraft, which has way more flights. These flights go up for 20 minutes and then go down. This is way more useful for forecasting. UW-SSEC Ground StationLaptop electronic package…System Electronics: There is an inside embedded PC, which size wise is like a 15 inch laptop. An embedded pc has a GPS card with multiple channels. The GPS information is sent to some stations. 30 years ago, the radar reflection gathered track data and send it back by radio. Then a system was created simpler than radars to get winds and data. Nowadays we use GPS sensors and get data a lot simpler and faster.There is a sample balloon and sample radiosonde being passed around. Radiosonde Ground CheckWhile in channel, the temperature sensor is checked to make sure degree is same as ground check. Also the relative humidity sensors are checked to make sure they are accurate. There is a relative humidity sensor, which is a passive sensor which means it has a plate that is measuring capacity of that plate as it goes through the air. More humidity there is the less capacity something has. These plates are very sensitive to debre or other things. We are looking at a picture of a sonde. The sonde has a GPS antenna, which is a sensor wand that gets data points.Temperature sensor wands want to get data every second. The temperature sensors are very thin wirers. Wire is very thin to equalize the air to get an accurate measurement of the temperature. The humidity sensors on the sonde go through clouds, which make water deposits go on it, these clouds have 100% humidity. To combat this there are two sensors on there. While in flight, sonde package will heat one of those sensors while water is deposited and then vaporized, the other sensor at this time will take data. After a bit they switch, and then data is gathered from the other one. There is a little chip between the white dots thatgathers the data for this. Ground Station Antennas: We have to look back to electronics. There is an ethernet cable that goes from the laptop to the antenna. One cable that’s in the middle goes to the GPS antenna. Middle antenna is UHF antenna. We are going to use a smaller one for our launch. Balloons!This is a picture of a summit camp that studies interaction of ice sheet and lower point of the atmosphere. They launch balloons there twice a day. There is a need to control how much helium are in the balloons in order to gather data accurately.There are two ways to control helium amount in the balloons, one way is to create weights and the balloon till they then get to the appropriate rate. The other way is to just see how much pressure of helium is taken from the tank. (This is easier) Not as much pressure in these balloon as we would think. Balloon release videos:Can still launch a balloon when there are 45 mph winds! Not to expensive for equipment, good chance balloonwill just go along surface and trash the data. Ever get sonde package back? They used to put names on those. It ended up being not a cost effective thing, so no they do not get sonde package back anymore. Back to Lecture Sort of:Balloon launching just east of Engineering Building. Engineering Mall on Friday 9/19 at 11 am. So meet at launch site. Get to watch getting the balloon ready and then we will see it for a few minutes. There are rooftop cameras we can follow the balloon for quite a while. Do assignment to predict what the balloon is going to observe when it raises. Predict what balloon is going to see at 500 mb. We need to know pressure, humidity, temperature, and wind. So we are to predict what it’s going to measure at 500 mb at 3 qualities. When it gets to 500 mb pressure will take temperature humidity and wind predict these based on the predictions online. Best place is central operations, can look at 500 mb map at time it is going to be launched. 6Z (midnight night before) can look at forecast and then from that map read off the map what the temperature, humidity, and wind will be at 500 mbin Madison. Get connection between what balloon is measuring and what website says. When they do measurements into numerical model they actually put down position of balloon not position of where it is launched. That is where they assume data point is being measured. 2nd thing measure maximum wind is going to measure. Look all the weather maps at a function of height, try tofigure what strongest wind is, pressure of what it is and try to figure out what it is. Try to look at all weather maps at different elevations and realize what those maps mean.Jet streams usually higher than 500 mb. Jet streams quite normally around 300 to 200 mb. The jet stream is somewhere in there. 250 mb 300 mb. It takes about 30 minutes to get to 500 mb. We will probably lose the balloon at 150 km. Typically at that distance it is about 1 hour and a half into the sounding. Erik would


View Full Document

UW-Madison ATMOCN 100 - Guest Lecture and Some Current Weather Notes

Documents in this Course
Load more
Download Guest Lecture and Some Current Weather Notes
Our administrator received your request to download this document. We will send you the file to your email shortly.
Loading Unlocking...
Login

Join to view Guest Lecture and Some Current Weather Notes and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Guest Lecture and Some Current Weather Notes 2 2 and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?