Tropical cyclone research assignment analysis
1. Draw a rectangular frame around the study area defined as (lat 5 to 15 S, 1ong 155 to 170E). Draw a vertical line (dash line) dividing the study area into equal halves. Then plot it on a high-resolution map dataset provided. That is Figure 1. Script 1.
2. Second, is Data analysis
a. Count the total (SP-all) number of tropical cyclone tracks in the dataset since 1979/1980 season to 2019 (interested period for this assignment). Display the cyclone tracks on the high res map (Q1). That is Figure 2. Script 2.
b. Out of the total number of cyclones in (2a), count how many have started outside (T-out) and then later in its lifetime have entered the study area (Q1). And then, count the number of cyclone tracks (T-in) that have started in the study area. Add T-out and T-in to get the total number of cyclones (SI-all) affecting the study area. Plot all the tracks on the map (blue for T-in, and black for T-out). All cyclone tracks should have all points (lat long) in their complete lifetimes. Also display values of T-out, T-in, and SI-all on the same plot. Note that a tropical cyclone started when windspeed is 34 knots and it ends in the dataset, just before where a new one started. Figure 3, Script 3.
c. Locate the first points (genesis locations) of each tropical cyclone over this domain (lat 0 to 20 S, long 150 to 200 E). Plot points over the high-resolution map. Every first point starts when windspeed is 34 knots. Figure 4, script 4.
3. Next, count the number of cyclones that at any of their lifetime are positioned at 200 kilometers from the center of the study area (lat 5 to 15 S, 1ong 155 to 170E). Then draw the cyclone tracks with their changes in windspeed (marked with different colors) and respective names on the map. Figure 5. Script 5.
4. Calculate the frequency of cyclones for SI-all (total number of cyclones affecting the study area).
a. On yearly basis
b. On monthly basis
c. Plot them using bar graph on 1 plot. Figure 6, script 6.
5. Sort the wind speeds according to the criteria below for the study period.
a. Plot each category (1, 2, 3, 4, 5) on a time series.
b. Do trend analysis to find significant results. Figure 7. Script 7.
|
Cyclone Category |
Windspeed in knots |
|
1 |
34 to 47 |
|
2 |
48 to 67 |
|
3 |
90 to 121 |
|
4 |
122 to 151 |
|
5 |
>151 |
6. Calculate the Accumulated cyclone energy (ACE) for each season. First season starts at November and it runs through to April (following year). E.g. 1979/1980, 1981/182….et. The ACE for the interested period and the study area is calculated by summing the squares of the estimated maximum sustained velocity of every tropical cyclone every six hours interval. Plot the results on a time series. Figure 8. Script 8.
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