首页|A revisit of global wind-sea and swell climate and variability using multiplatform altimeters
A revisit of global wind-sea and swell climate and variability using multiplatform altimeters
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NSTL
Elsevier
A well-performed (root mean square error approximate to 0.35 m) look-up table model was established to separate the wind-sea and swell significant wave height (H-s) using 10-m sea surface wind speed (U-10) and H-s data from altimeters. Based on this model, global wind-sea and swell climate and variability were investigated using 27-year jointly calibrated altimeter data. The climatology of the swell and wind-sea H-s (H-WS and H-SW) are in good agreement with those of the total H-s and U-10, respectively. This is because of the dominance of swells in the World Ocean with respect to both occurrence frequency and energy proportion and the close coupling between wind and wind-seas. The interannual variability of H-WS and H-SW are closely related to some climate indices, but the responses of wind-seas and swells are different for the same atmospheric oscillation because of the large propagation distances of swells. For long-term variability, significant positive/negative long-term trends of H-WS/H-SW were found almost all over the World Ocean. Such opposite trends can be explained by the positive/negative trends of U-10/H-s: a shorter fetch or duration of wind leads to a lower H-s, but a higher U-10 leads to higher wind-sea probability and energy weight. However, large uncertainty still exists in these trends and further exploration is needed.
NSTL
Elsevier
