1. Tracking Tropical Cyclones in the Northwest Pacific During El Nino Andy Chan Environmental and Water Resources Engineering University of Texas at Austin webspace.utexas.edu/zimmeau/www/gis

2. EAST ASIA China Vietnam North Korea South Korea Japan Taiwan The Philippines Macau

3. Data Source Joint Typhoon Warning Center http://metocph.nmci.navy.mil/jtwc/best_tracks/wpindex.html NOAA National Weather Service Climate Prediction Center http://www.cpc.noaa.gov/products/analysis_monitoring/ensostuff/e nsoyears.shtml

4. Dr. Johnny Chan’s Observation Tropical cyclone activity over the western North Pacific associated with El Nino and La Nina events. J. Climate, 13, 2960-2972

5. Determining El Nino, La Nina, and Neutral Years YearDecJanFebMarAprMayJunJulAugSepOctNovENL 19880.80.50.1-0.3-0.8-1.2 -1.1-1.3-1.6-1.9 L 1989-1.7-1.5-1.1-0.9-0.6-0.4-0.3 -0.2-0.1N 19900.10.20.3 0.40.3 0.4N 19910.50.4 0.60.80.9 0.81.01.41.7E 19921.81.71.61.41.10.80.40.2-0.1 0.00.1N 19930.30.40.60.8 0.70.50.4 0.30.2 19940.20.30.40.50.6 0.70.91.21.3E 19951.20.90.70.40.20.10.0-0.3-0.5-0.6-0.7-0.8L 1996-0.8-0.7-0.5-0.3-0.2 -0.1-0.2 -0.3-0.4N 1997-0.4-0.30.00.40.91.41.72.02.32.42.5 E 19982.42.01.41.10.4-0.1-0.8-1.1 -1.3-1.5L 1999-1.6-1.2-0.9-0.7-0.8 -0.9 -1.2-1.4-1.6L 2000-1.6-1.5-1.1-0.9-0.7-0.6-0.4-0.3-0.4-0.5-0.7 L 2001-0.7-0.5-0.4-0.2-0.10.10.20.10.0-0.1-0.2 N 2002-0.10.10.30.40.70.80.9 1.11.31.51.3E 20031.10.80.60.1-0.10.00.30.40.5 0.60.5 20040.40.2 0.30.40.70.80.9 0.8E

6. Raw Data

7. Convert Points to Polygon http://www.xtoolspro.com/tools.html

8. POINTS AND POLYLINE

9. THE GRID

10. Neutral Years

11. El Nino Years

12. La Nina Years

13. Difference between El Nino and Neutral Years

14. Difference between La Nina and Neutral Years

15. Conclusion El NinoLa Nina South China Sea Below Normal Above Normal East Asia (Japan) Above Normal Below Normal Matched with the observations in Dr. Chan’s paper.

16. Thank you. Questions?