Directional radiative temperature observations for improvement of land-atmosphere interactions

Z. Su*, J. M. Wang, J. Wen, L. Jia, M. Menenti

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review


Along with a brief account of the characteristics of the Advanced Along Track Scanning Radiometer (AATSR) data onboard of the ENVISAT satellite, field observations of directional radiometric temperatures are analysed to examine the possibilities of using AATSR data to improve the estimates of the energy and water balances on land surfaces, especially for the purpose of numerical weather forecasts and climate research. In the summer of 1998, we have participated in the Inner Mongolia Grassland-Atmosphere Surface Study (IMGRASS) campaign. Apart from many other measurements (tower, eddy correlation, thethered-balloon, total and spectral radiation, soil temperature gradients, etc.), intensive measurements were carried out for directional radiative temperatures. Preliminary analysis of the data indicates that the difference in radiative temperature between different view angles is primarily caused by the vegetation fraction viewed. The difference between nadir and 23 degree is around 0.5 K, and that between nadir and 52 degree reaches 1.5 to 2 K dependent on the time of the measurements. This finding is similar for two independent measurement set-ups at two separate locations, both having similar sparse grass covers of around 10 cm high, and a leaf area index of 0.5.

Original languageEnglish
Title of host publication IEEE 1999 International Geoscience and Remote Sensing Symposium. IGARSS'99
Place of PublicationHamburg
Number of pages3
ISBN (Print)0-7803-5207-6
Publication statusPublished - 1 Jul 1999
Externally publishedYes
EventIEEE International Geoscience and Remote Sensing Symposium, IGARSS 1999: Remote Sensing of the Systems Earth - A Challenge for the 21st Century - Hamburg, Germany
Duration: 28 Jun 19992 Jul 1999


ConferenceIEEE International Geoscience and Remote Sensing Symposium, IGARSS 1999
Abbreviated titleIGARSS 1999


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