Knowledge Resource Center for Ecological Environment in Arid Area
| 报告编号 | NASA-CR-144764, ES-1008 |
| 来源ID | NTRS_Document_ID: 19760019674 |
| Application of the Nimbus 5 ESMR to rainfall detection over land surfaces | |
| Meneely, J. M. | |
| 英文摘要 | The ability of the Nimbus 5 Electrically Scanning Microwave Radiometer (ESMR) to detect rainfall over land surfaces was evaluated. The ESMR brightness temperatures (Tb sub B) were compared with rainfall reports from climatological stations for a limited number of rain events over portions of the U.S. The greatly varying emissivity of land surfaces precludes detection of actively raining areas. Theoretical calculations using a ten-layer atmospheric model showed this to be an expected result. Detection of rain which had fallen was deemed feasible over certain types of land surfaces by comparing the Tb sub B fields before and after the rain fell. This procedure is reliable only over relatively smooth terrain having a substantial fraction of bare soil, such as exists in major agricultural regions during the dormant or early growing seasons. Soil moisture budgets were computed at selected sites to show how the observed emissivity responded to changes in the moisture content of the upper soil zone. |
| 英文关键词 | MICROWAVE RADIOMETERS NIMBUS PROJECT NIMBUS 5 SATELLITE RAIN BRIGHTNESS TEMPERATURE EARTH SURFACE SATELLITE OBSERVATION SOIL MOISTURE |
| 出版年 | 1975 |
| 报告类型 | Technical Report |
| 语种 | 英语 |
| 国家 | 美国 |
| URL | http://hdl.handle.net/2060/19760019674 |
| 资源类型 | 科技报告 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/258628 |
| 推荐引用方式 GB/T 7714 | Meneely, J. M.. Application of the Nimbus 5 ESMR to rainfall detection over land surfaces,1975. |
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