Sarah RoseATOC 1070Lab 1Accumulated Precipitation ComparisonTimeCU DisdrometerMarshall Rain Gauge30-Min AmountUTC mm mm mm12/23/09 10:00 85.69 77.4600 7.790012/23/09 10:30 85.73 77.9400 7.390012/23/09 11:00 86.08 78.6900 7.040012/23/09 11:30 86.52 79.4800 7.290012/23/09 12:00 87.34 80.0500 7.390012/23/09 12:30 88.06 80.6700 7.260012/23/09 13:00 88.46 81.2000 6.710012/23/09 13:30 88.65 81.9400 5.790012/23/09 14:00 88.78 82.9900 5.470012/23/09 14:30 88.85 83.3800 5.010012/23/09 15:00 89.27 84.2600 4.840012/23/09 15:30 89.98 85.1400 5.390012/23/09 16:00 90.68 85.2900 6.380012/23/09 16:30 91.86 85.4800 7.050012/23/09 17:00 92.74 85.6900 7.820012/23/09 17:30 93.55 85.7300 7.970012/23/09 18:00 94.01 86.0400 7.910012/23/09 18:30 94.4 86.4900 7.330012/23/09 19:00 94.63 87.3000 6.770012/23/09 19:30 94.81 88.0400 6.780012/23/09 20:00 95.24 88.4600 6.750012/23/09 20:30 95.39 88.6400 6.740012/23/09 21:00 95.5 88.7600 6.800012/23/09 21:30 95.65 88.8500 6.420012/23/09 22:00 95.71 89.2900 5.830012/23/09 22:30 95.85 90.0200 5.730012/23/09 23:00 96.45 90.7200 5.050012/23/09 23:30 96.95 91.9000 5.190012/24/09 0:00 97.98 92.7900 5.960012/24/09 0:30 99.44 93.4800 5.980012/24/09 1:00 99.93 93.9500 6.270012/24/09 1:30 100.73 94.4600 6.530012/24/09 2:00 101.22 94.6900 6.910012/24/09 2:30 101.76 94.8500 7.510012/24/09 3:00 102.72 95.2100 8.120012/24/09 3:30 103.52 95.4000 8.550012/24/09 4:00 104.06 95.5100 8.990012/24/09 4:30 104.65 95.6600 9.390012/24/09 5:00 105.1 95.7100 9.780012/24/09 5:30 105.63 95.8500 9.580012/24/09 6:00 106.05 96.4700 9.210012/24/09 6:30 106.21 97.0000 0.0000Group Members: Kenneth Buchler, Liz Dohato, Nguyet NguyonSarah RoseATOC 1070 Lab 112/23/09 11:16 12/23/09 23:16707580859095100105110f(x) = 22.79x − 915540.49f(x) = 24.47x − 982743.15Accumulated Precipitation Comparison Disdrometer Rain GaugeTime UTCAccumulated Rain (mm)Group Members: Kenneth Buchler, Liz Dohato, Nguyet NguyonSarah RoseATOC 1070 Lab 1, Part AQuestion 1 all answers need to be in mma. What was the initial amount of liquid water in your spray bottleBegan with 1 inch of water in spray bottle. 1 inch is equal to 25.4 mm1 (25.4) = 25.4 mmb. What was the final amount of liquid in your spray bottle 0.59 inches0.59inches (25.4) = 14.986 mmc. How much water was sprayed through the bottle into the disdrometer beam?25.4 mm – 14.986 mm = 10.414 mmd. How long did it take for this amount (c) to pass through the disdrometer beam? 60 secondse. What is your “precipitation rate” for this experiment? 10.414 mm / 60 seconds = 0.1736 mm/secQuestion 2 all answers need to be in mma. What is the largest rain drop size observed in your data?Between 2.5 and 3 mmb. What is the smallest rain drop size observedBetween 0.25 and 0.375 mmQuestion 3 a. What limits the size of drops in this experiment?The diameter of the spray nozzle b. What limits natural raindrop size?Liquid forms drops because the liquid exhibits surface tension.The distribution of sizes is due to the raindrops’ interaction with air, which deforms and causes the drop to fragment into smaller drops, effectively limiting the largest raindrops to about 6mm in diameter. Question 4a. Which would you expect to fall faster in nature, a large drop or a small drop? Why?If you exclude the resistance the air has on the two raindrops, both the small and the lager raindrops will travel at the same. But because we do have air resistance which will resist the gravitationalattraction, the raindrop with the larger mass will reach the ground first. b. Does this agree with your data? Why or why not?Not really. Our data suggests that the larger 1.5-3.0 mm raindrops had velocities between 1 and 2 m/s where the smaller drops (0.25 to 0.5 mm) reached 4-5 m/s. Summary & Conclusion In this experiment our group took disdrometer measurements of a simulated rain shower and determined the size of the “rain drops” and their fall velocities. We measured the water for the spray bottle to 1 inch in a graduated cylinder and then transferred the water into the spray bottle. Some possible measuring errors could have occurred heresuch as poor initial measurement or spilling of the water in the transferto the bottle. Next one person from the group squeezed the spray bottle into the disdrometer while data was recorded on the computer. Some possible sources of error for the measurements here are that theenvironment we’ve created in the class room doesn’t simulate the outdoor conditions of a thunderstorms (ie there is no updraft). The fact that there is no updraft will make question 4 difficult to answer. In naturally occurring thunderstorms small rain droplet take longer to fall because they are smaller and are subject to updraft where larger dropsare less susceptible and therefore fall quicker. I’m not sure if this helps explain or me understand how weather works everyday just because it is a synthetic example that’s results don’t reflect real weather conditions.Sarah RoseATOC 1070 Lab 1, Part BQuestion 1a. Which instrument measured a faster average rainfall rate during the storm? How do you know this?The CU disdrometer, because of its over all higher points on the graph make its average over all greater then the NWS Radar and MRR. Question 2Which instrument appears to be the most accurate and/or precise? In your answer define “accurate” and “precise” as they apply to scientific measures.Accurate of a measurement system is the degree of closeness of measurements of a quantity to that quantities’ actual (true) valuePrecision of a measurement system is the degree to which repeated measurements under unchanged conditions show the same resultsIn other words accuracy means getting a result that is close to the real answer. Precision means getting a similar result every time you try.The rain gauge data from part one of this lab is more accurate AND precise. I say this because the rain gauge data doesn’t waver much from the liner line or average. So it is more accuratebecause it’s getting more results closer to the ‘real’ answer and it’s more precise because it gets more consistent answers every time. Where the disdrometer data wavers quite a bit.Question 3a. What are the four instruments used to collect this data?1) Radar 2) Rain gauge 3) Disdrometer 4)Satellite b. What is the maximum reflectivity measured during the sampling time, and which instrument measured it?31.828 dBz, disdrometerQuestion 4a. What is the maximum rainfall rate measured during the sampling