The accuracy of Doppler radar wind retrievals using insects as targets

The accuracy of Doppler radar wind retrievals using insects as targets
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以昆虫为目标的多普勒雷达风反演精度

DOI:
10.1002/met.174
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发表时间:
2010
影响因子:
2.7
通讯作者:
Rennie S
Rennie S
中科院分区:
地球科学4区
文献类型:
--
作者:
Rennie S

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在2007年和2008年夏天,收集了来自英国多普勒天气雷达的昆虫回报,以确定它们在提供边界层风信息方面的有用性。这些观测结果可以被同化到数值天气预报模式中,以改善降水开始前对流阵雨的预报。在此期间的几天里,在白天观察到大量昆虫返回,当时它们在距离雷达30公里的范围内和海拔2公里的地方被发现。发现可检测的昆虫返回的范围随一年中的时间和温度而变化。与风速和风向的相关性也很弱。使用双极化雷达发现,昆虫并不是随机定位的,而是在几天内显示出共同方向的明显证据,有时与它们的行进方向成一个角度。风廓线的观测值减去模式背景残差显示出比其他风测量类型更大的偏差和标准差,这可能是由于昆虫的航向/空速和不完善的数据提取。这里使用的方法,类似于气象局提取降水返回的程序,需要进一步的发展,杂波污染仍然是最大的误差贡献者之一。从昆虫返回的风观测结果,然后将是有用的数据同化应用。版权所有© 2010皇家气象学会和皇冠版权所有。
Insect returns from the UK's Doppler weather radars were collected in the summers of 2007 and 2008, to ascertain their usefulness in providing information about boundary layer winds. Such observations could be assimilated into numerical weather prediction models to improve forecasts of convective showers before precipitation begins. Significant numbers of insect returns were observed during daylight hours on a number of days through this period, when they were detected at up to 30 km range from the radars, and up to 2 km above sea level. The range of detectable insect returns was found to vary with time of year and temperature. There was also a very weak correlation with wind speed and direction. Use of a dual‐polarized radar revealed that the insects did not orient themselves at random, but showed distinct evidence of common orientation on several days, sometimes at an angle to their direction of travel. Observation minus model background residuals of wind profiles showed greater bias and standard deviation than that of other wind measurement types, which may be due to the insects' headings/airspeeds and to imperfect data extraction. The method used here, similar to the Met Office's procedure for extracting precipitation returns, requires further development as clutter contamination remained one of the largest error contributors. Wind observations derived from the insect returns would then be useful for data assimilation applications. Copyright © 2010 Royal Meteorological Society and Crown Copyright.
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