Knowledge Resource Center for Ecological Environment in Arid Area
| 报告编号 | NASA-CR-168799, NAS 1.26:168799, AR-00 |
| 来源ID | NTRS_Document_ID: 19820014955 |
| Theoretical and lidar studies of the density response of the mesospheric sodium layer to gravity wave perturbations | |
| Shelton, J. D.; Gardner, C. S. | |
| 英文摘要 | The density response of atmospheric layers to gravity waves is developed in two forms, an exact solution and a perturbation series solution. The degree of nonlinearity in the layer density response is described by the series solution whereas the exact solution gives insight into the nature of the responses. Density perturbation in an atmospheric layer are shown to be substantially greater than the atmospheric density perturbation associated with the propagation of a gravity wave. Because of the density gradients present in atmospheric layers, interesting effects were observed such as a phase reversal in the linear layer response which occurs near the layer peak. Once the layer response is understood, the sodium layer can be used as a tracer of atmospheric wave motions. A two dimensional digital signal processing technique was developed. Both spatial and temporal filtering are utilized to enhance the resolution by decreasing shot noise by more han 10 dB. Many of the features associated with a layer density response to gravity waves were observed in high resolution density profiles of the mesospheric sodium layer. These include nonlinearities as well as the phase reversal in the linear layer response. |
| 英文关键词 | DENSITY MEASUREMENT GRAVITY WAVES MESOSPHERE OPTICAL RADAR AERONOMY SIGNAL PROCESSING SODIUM STRATOSPHERE VARIABILITY |
| 出版年 | 1981 |
| 报告类型 | Technical Report |
| 语种 | 英语 |
| 国家 | 美国 |
| URL | http://hdl.handle.net/2060/19820014955 |
| 资源类型 | 科技报告 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/258897 |
| 推荐引用方式 GB/T 7714 | Shelton, J. D.,Gardner, C. S.. Theoretical and lidar studies of the density response of the mesospheric sodium layer to gravity wave perturbations,1981. |
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