| Autor: |
E.R. Westwater, B. Patten, V.G. Irisov, V. Lenski, L. S. Fedor |
| Rok vydání: |
2002 |
| Předmět: |
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| Zdroj: |
IGARSS 2000. IEEE 2000 International Geoscience and Remote Sensing Symposium. Taking the Pulse of the Planet: The Role of Remote Sensing in Managing the Environment. Proceedings (Cat. No.00CH37120). |
| DOI: |
10.1109/igarss.2000.860485 |
| Popis: |
Measurements of the sea-air temperature difference using a 5-mm wavelength scanning radiometer were made previously from a ship. It was shown that groundbased scanning observations in the oxygen absorption band allow the measurement of the water skin-air temperature difference with an accuracy of about O.1K. Changes in the air temperature gradient of less than 0.005 K/m in the 20-200 meter altitude layer are detectable. A similar scanning radiometer was built in the Environmental Technology Laboratory in 1997. In 1999, the radiometer was modified to include an internal reference load, ferrite switch, step motor, and computer motor control. The instrument was mounted in the wing tip of a Twin-Otter airplane and deployed during the Shoaling Waves Experiment. This experiment was conducted near the East Coast of North Carolina during the fall 1999. The radiometric observations were supported by meteorological buoy data. In contrast to ground-based observations airborne observations of sea-air temperature have some features that increase the measurement errors. It is not possible to average the data during the airplane flights as long as can be done with ship observations. Another important feature is the influence of the atmosphere layer below the aircraft. For flying at an altitude of 300 m, water temperature differences of few tenths of degree can be seen, but it is difficult to measure air temperature in the layers nearest to sea surface. In the report, the authors describe the measurement technique and results of the airborne measurements of the sea-air temperature difference. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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