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Junhong Wang, Jianchun Bian, William O. Brown, Harold Cole, Vanda Grubišić, and Kate Young

importance of vertical motion in the atmosphere, it is crucial to measure the VV on all temporal and spatial scales. However, the VV is difficult to measure mainly because of its small magnitude (an order of a few centimeters per second; Holton 1992 ). In the past, the VV was not measured directly; instead it was derived from horizontal winds using the continuity equation. Over the past few decades, various techniques have been developed to directly measure the VV, including sonic anemometry on flux

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Susanne Drechsel, Georg J. Mayr, Michel Chong, Martin Weissmann, Andreas Dörnbrack, and Ronald Calhoun

Doppler radar. A major advance in 3D wind retrieval was made by combining two or more Doppler radars along with the continuity equation (e.g., Armijo 1969 ; Ray et al. 1978 ) as physical contraint. During the last decades, large improvements in signal processing (i.e., filtering, interpolation, and differentiating raw data) and analysis ( Testud and Chong 1983 ; Chong et al. 1983 ; Chong and Testud 1983 ) improved the quality of the retrieved 3D wind field ( Bousquet and Chong 1998 ), even in

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