Does wind stress depend on sea-state or not? A statistical error analysis of HEXMAX data

被引:66
作者
Janssen, JAM
机构
[1] Roy. Netherlands Meteorol. Institute
关键词
sea-state dependent stress; statistical error analysis; HEXMAX; Charnock parameter; sea roughness;
D O I
10.1023/A:1000336814021
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
There have been several claims, either explicit or by implication, either based on experimental evidence or on theoretical reasoning, that the wind stress is modified by the stage of development of the wind sea. However, the overall evidence is weak, because theories are still incomplete and because it is questionable whether the sea-state effect, which is of the order of 10%, can be separated from experimental noise, which is of the order of 20%. In this paper a rigorous statistical analysis of HEXMAX data is pursued in order to establish the significance of sea-state effects. It appears that the enhanced drag, especially at high winds, which has already been established by previous analyses, cannot be attributed to the effect of young waves. The analysis provides no clues for the actual mechanism, which could be related to breaking or shoaling waves. As the effect of sea-state on wind stress is much smaller than the experimental noise level, it is hard to detect. Nevertheless, HEXMAX seems to contain a wave effect that is at the edge of statistical significance. It is, however, not the wave age itself that influences the drag, but a parameter involving wave height. Because the HEXMAX evidence is only indicative, we conclude that the issue set out in this paper cannot be answered on the basis of the HEXMAX data alone. It is recommended that error analyses are also carried out for other relevant observational data sets and that new measurements with suppressed noise will be taken up.
引用
收藏
页码:479 / 503
页数:25
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