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Water Resource
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Behavior of Typhoon observed by NIMBUS -7 TOMS data
Case Study for typical data
The pattern of ozone accompanied by typhoon is categorized in to three groups (1) which have high concentration swirls into the center of typhoon (2) The center of typhoon shows thicker concentration than the surroundings (3) A slight relationship between the two . I this study two typical case are selected for intensive study . the first case is that of August 24 1986 which belongs to the type of ozone swirling in to the typhoon . The second case is that September 26 1986 which belongs to the type thicker concentration of ozone in the center of typhoon.
- Case Study : august 24, 1986
- The relationship between total ozone and the surface pressure pattern.
In Fig. 1 shown the surface weather map at 00 GMT August 24 1986 in which two typhoons
VERA (typhoon) 8613) and WAYNE (typhoon 8614) in the Pacific Ocean. The central pressure of the former is 945 mb while 985 mb for the latter. The total ozone distribution pattern corresponding to the time of the surface weather map is shown in Fig.2, which shows that the high concentration of ozone (from 280 to 290 Dobson unit) swirls into an area at the left side. The high concentration of ozone extends toward southwest from the middle-upper part in TOMS image . The white parts. Of the map means no data.
- The relationship between daily ozone distribution and synoptic atmosphere condition
Fig. 3 is 300 mb chart at 00 GMT on August 24, 1986 in which jet stream axis is indicated with a heavy broken line while trough lines are indicated with heavy solid lines. The difference image of TOMS data between Aug 23 and Aug 24 (24th-23th), 1986 is shown in Fig. 4. It can be seen that total ozone has increased more than 15 DU to the west of the 300 mb trough line
or near of the trough line Movement. This is the area where divergence prevails resulting in large scale descending motion. The area where ozone amount decreases more than 15 Dobson unit corresponds to the east of the trough where upward motion prevails. Fig. 5 shows the vertical profile of E-W component of the wind speed on the longitude 130 E with positive for west component on the latitude 1300E. The easterly wind blows between the equator and the latitude 200N. The westerly wind blows on the north of the latitude 300N. The easterly wind in low latitude seems to move ozone toward west. Then Ozone swirls into the typhoon (typhoon of 8614).
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