MEASUREMENTS WITH RADAR OF THE HEIGHT OF NOCTURNAL MIGRATION OVER CAPE COD
MEASUREMENTS WITH RADAR OF THE HEIGHT OF NOCTURNAL MIGRATION OVER CAPE COD
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用雷达测量科德角夜间迁徙的高度
DOI：
10.2307/4510994
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发表时间：
1963
期刊：
影响因子：
--
通讯作者：
I. Nisbet
中科院分区：
文献类型：
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作者：
I. Nisbet
事情发生了。Stebbins（1906）和Carpenter（1906）描述了一种测量高度的方法，其中两个相邻的观察者在月球上训练望远镜，但该方法给出了有偏差的结果，并且没有系统地应用。莱克（1960）用雷达测高仪观察了英格兰上空的候鸟迁徙，但他的结果的实用性受到限制，因为他只能观察到最高的鸟类，这在整个迁徙中只占很小的比例（而且是未知的）。拉克引用了欧洲雷达的其他研究，这些研究基于太少的夜晚，无法给出可靠的平均值。本文叙述了在新英格兰用雷达测高仪所作的观测，这种雷达测高仪可以对除最低的鸟类以外的所有鸟类进行定量观测。这些观测的主要局限性在于，它们是从科德角（Cape Cod）观测到的，科德角是一个伸入海中约40英里的海角，可能不能代表新英格兰大陆上的移民。致谢雷达观测和我对北美的访问是由美国国家科学基金会的赠款（G11571）资助的（完整的致谢见Drury &基思1962）。W. H.小德鲁里提供了从科德角（Cape Cod）的雷达图像中提取的未发表的信息（表1），并提供了许多实际的帮助和建议。E. Corpus提供了解释结果的技术建议。
tion takes place. Stebbins (1906) and Carpenter (1906) described a method of measuring heights in which two adjacent observers train telescopes on the moon, but the method gives biased results and has not been applied systematically. Lack (1960) observed migration over England with a radar height-finder, but the usefulness of his results is limited by the fact that he could only observe the highest birds, a small (and unknown) proportion of the whole migration. Other studies made with radar in Europe, quoted by Lack, were based on too few nights to give reliable averages. This paper describes observations made in New England, using a radar heightfinder which permitted quantitative observations of all birds except the very lowest. The chief limitation of these observations is that they were made from Cape Cod, a promontory extending some 40 miles into the sea, and may not be representative of migration over the mainland of New England. Acknowledgements The radar observations, and my visit to North America, were financed by a grant (G11571) from the National Science Foundation of the United States (for full acknowledgements see Drury & Keith 1962). W. H. Drury, Jr., supplied unpublished information drawn from radar films of migration over Cape Cod (Table 1), and gave much practical help and advice. E. Cormier gave technical advice on interpreting the results.