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I nternational B est Tr ack A rchive for C limate S tewardship

Best Track Continuity: IBTrACS Perspective. I nternational B est Tr ack A rchive for C limate S tewardship. Questions…. When do BT data become reliable ? For frequency? For intensity ? How can we improve data homogeneity across time?

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I nternational B est Tr ack A rchive for C limate S tewardship

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  1. Best Track Continuity: IBTrACS Perspective International Best Track Archive for Climate Stewardship

  2. Questions… • When do BT data become reliable? • For frequency? • For intensity? • How can we improve data homogeneity across time? • How can we minimize discrepancies between agencies?

  3. Defining a Global Dataset • NHC + JTWC • Pro: Consistent averaging period for intensities • Con: JTWC is not the official agency for any basin • IBTrACS • Pro: Includes all available data • Con: How do you get one track? • WMO Subset of IBTrACS • Pro: Sanctioned by the WMO • Con: Not Homogeneous

  4. When do BT data become reliable? “Satellite era” begins late 1970s JTWC 1945 JMA 1951

  5. North Atlantic ATCF includes TDs starting in 1968 • 5

  6. Eastern North Pacific JWTC_EP and TD9636 Atlantic Storms • 6

  7. Western North Pacific JMA winds begin in 1977 CMA TD9636 Coming Soon: JAMSTEC • 7

  8. North Indian IBTrACS Overcounts TD9636 DS824 IMD • 8

  9. Duplicates

  10. South Indian IBTrACS Overcounts • 10

  11. South Indian (>30 kts) • 11

  12. South Pacific Wellington Begins in 1968 TD9636 • 12

  13. When do BT data become reliable? “Satellite era” begins late 1970s JTWC 1945 New Delhi 1990 JMA 1951 Wellington 1968

  14. Questions… • How far back can climate analysis go in each basin? • For frequency? • For intensity? • How can we ensure data homogeneity across time? • How can we minimize discrepancies between agencies?

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