Surface winds from tropical Pacific islands - Climatological statistics
Surface winds from tropical Pacific islands - Climatological statistics
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来自热带太平洋岛屿的地面风 - 气候统计
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
D. Luther
中科院分区：
文献类型：
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作者：
D. E. Harrison;D. Luther
摘要为了研究变化的空间和时间尺度，对热带太平洋岛屿地面风观测的几十年时间序列进行了检验。气候月平均值和方差与船只观测的可比平均值和方差进行比较;通常平均值在速度上一致在10.1 m s−1以内，方向上一致在10.10度以内。年周期和半年周期在细节上有所不同。岛屿纬向风的方差通常要大得多，在9月至12月期间赤道附近高达10 m2 s−2;由于岛屿结果的空间一致性，这些差异被认为是由船舶数据典型的不良高频采样造成的。近赤道纬向风方差极大值与ENSO周期变率有关;排除ENSO时间周期后，在广阔区域内的方差相对均匀，为0.5m2 s−2。方差的频率分布，来自每日平均数据，表现出c…
Abstract Multidecadal time series of surface wind observations from tropical Pacific islands have been examined in order to investigate the space and time scales of variability. Climatological monthly means and variances are compared with comparable means and variances derived from ship observations; usually the means agree to within ∼1 m s−1 in speed and ∼10 degrees in direction. Annual and semiannual cycles differ in detail. Island zonal wind variances are often significantly larger, by up to 10 m2 s−2 near the equator between September and December; because of the spatial coherence of the island results, these discrepancies are believed to result from the poor high-frequency sampling typical of ship data. A substantial near-equatorial zonal wind variance maximum is shown to be related to ENSO period variability; excluding ENSO time periods leaves a relatively spatially uniform variance of ∼5 m2 s−2 over a broad region. The frequency distribution of variance, derived from daily-averaged data, exhibits c...