Usability of Best Track Data in Climate Statistics in the Western North Pacific
- 1 September 2012
- journal article
- Published by American Meteorological Society in Monthly Weather Review
- Vol. 140 (9), 2818-2830
- https://doi.org/10.1175/mwr-d-11-00175.1
Abstract
Tropical cyclone (TC) activity for the last three decades shows strong discrepancies, deduced from different best track datasets (BTD) for the western North Pacific (WNP). This study analyzes the reliability of BTDs in deriving climate statistics for the WNP. Therefore, TC lifetime, operational parameters [current intensity (CI) number], and tracks are compared (for TCs identified concurrently) in BTD provided by the Joint Typhoon Warning Center (JTWC), the Japan Meteorological Agency (JMA), and the China Meteorological Administration (CMA). The differences between the BTD are caused by varying algorithms used in weather services to estimate TC intensity. Available methods for minimizing these discrepancies are not sufficient. Only if intensity categories 2–5 are considered as a whole, do trends for annually accumulated TC days show a similar behavior. The reasons for remaining discrepancies point to extensive and not regular usage of supplementary sources in JTWC. These are added to improve the accuracy of TC intensity and center position estimates. Track and CI differences among BTDs coincide with a strong increase in the number of intense TC days in JTWC. These differences are very strong in the period of intensive improvement of spatiotemporal satellite coverage (1987–99). Scatterometer-based data used as a reference show that for the tropical storm phase JMA provides more reliable TC intensities than JTWC. Comparisons with aircraft observations indicate that not only homogeneity, but also a harmonization and refinement of operational rules controlling intensity estimations, should be implemented in all agencies providing BTD.Keywords
This publication has 19 references indexed in Scilit:
- Remotely Sensed Winds and Wind Stresses for Marine Forecasting and Ocean ModelingPublished by European Space Agency ,2010
- Quantifying Interagency Differences in Tropical Cyclone Best-Track Wind Speed EstimatesMonthly Weather Review, 2010
- The International Best Track Archive for Climate Stewardship (IBTrACS)Bulletin of the American Meteorological Society, 2010
- On the size distribution of Atlantic tropical cyclonesGeophysical Research Letters, 2009
- The Operational Use of QuikSCAT Ocean Surface Vector Winds at the National Hurricane CenterWeather and Forecasting, 2009
- Variability in Intense Tropical Cyclone Days in the Western North PacificSOLA, 2006
- An Introduction to the Near–Real–Time QuikSCAT DataWeather and Forecasting, 2005
- Increasing destructiveness of tropical cyclones over the past 30 yearsNature, 2005
- Global Warming and Western North Pacific Typhoon Activity from an Observational PerspectiveJournal of Climate, 2004
- Tropical Cyclone Intensity Analysis and Forecasting from Satellite ImageryMonthly Weather Review, 1975