Wolf and Woolf 2006 paper discussion
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This document outlines a study on waves and climate change in the North Atlantic. It discusses how wave height has increased in the last 25 years, potentially due to stronger westerly winds from changes in the North Atlantic Oscillation. The study uses wave models forced by reanalysis data to simulate storm conditions and investigate the impact of storm frequency, intensity, track and translation speed on wave height. The models are able to replicate observed wave data and provide insight into how climate change may influence North Atlantic waves through changes in storminess.
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- 1. Waves and Climate Change in the North-East Atlantic by Judith Wolf and David K. Woolf Presented by: Irma Caraballo Álvarez October 4, 2012
- 2. Outline Introduction Wave models Results Discussion
- 3. Introduction Wave height increase Last 25 years Up to 14m in January 1993 Observed by Buoys Ships Satellite altimetry TOPEX/Poseidon
- 4. Introduction North Atlantic Oscillation (NAO) Icelandic Low Azores High +NAO Stronger westerlies
- 5. Introduction Figure 1. NAO from NOAA (http://www.climatewatch.noaa.gov/wp-content/uploads/2011/03/ao-nao2_pos_vs_neg.jpg).
- 6. Introduction Possible reasons Increase in winds Increase in storminess Storminess variations in decadal scales
- 7. Wave Models Usefulness Interpret data Study impacts of climate change Investigate physical explanations Extrapolate the model
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- 10. Wave Models Variables Strength of the westerlies Frequency of storms Intensity of storms Strom tracks Storm translation speeds
- 11. Wave Models Figure 3. Idealized storm with maximum wind speed 10m/s.
- 12. Wave Models Table 1. Features of the Storm Varied in the Experimentsa. Feature Low Medium High Frequency (month -1) 3 6 9 Intensity (m s-1) 10 15 20 Relative Strength 0.5 1 1.5 Direction ENE NE NNE Speed (km h-1) 25 50 100 aValues in bold are the "standard" case.
- 13. Results Storm frequency Storm intensity Relative strength of westerlies Storm track Storm translation speed Figure 4. Effects of the variables on wave height. Red crosses = monthly maximum, blue squares = monthly mean.
- 14. Discussion Is it possible to predict storms using this model? Can the model be used in other regions? Is NAO and storm frequency related to global warming?
- 15. The End