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首页> 外文会议>25th Conference on Agricultural and Forest Meteorology and 12th Joint Conference on the Applications of Air Pollution Meteorology with Aamp;WMA and Fourth Symposium on the Urban Environment May 20-24, 2002 Norfolk, Virginia >LENGTH SCALES OF REMOTELY SENSED VEGETATION, SURFACE RADIOMETRIC TEMPERATURE, AND DERIVED SURFACE ENERGY FLUXES
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LENGTH SCALES OF REMOTELY SENSED VEGETATION, SURFACE RADIOMETRIC TEMPERATURE, AND DERIVED SURFACE ENERGY FLUXES

机译：植被，表面辐射温度和衍生的表面能通量的长度标度

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摘要

The airborne data are dominated by the presence of a 800 m length scale in both the fractional vegetation and the radiometric temperature fields. The temperature data also exhibit a length scale on the order of 24 m. The cospectra between these data and the derived energy fluxes show small scale behavior on the order of 24 m. This indicates that the fluxes are responding primarily to small scale differences in temperature (due to the fact that no peak is observed at 24 m in the Fr data), rather than changes in the fractional vegetation. In the case of the AVHRR, the large scale variability dominates. The cospectra between Fr and temperature exhibits a small scale (2000 m) peak not observed in either spectra individually. This small scale activity is observed in the evaporation Fr cospectra. This is due to the radiative balance of the surface. With the AVHRR data, the initial pixel size is too coarse to observe local (field to field) variability in Fr that dominated over the temperature variability in the high resolution airborne data. At coarser pixel resolution (2000 m), the Fr spatial variability dominates over the importance in the temperature data, resulting in the peak in the evaporation at 2000 m. However, at even larger scales, neither Fr nor temperature dominates and the resultant fluxes have large contributions from both fields.
机译：机载数据主要由分数植被和辐射温度场中的800 m长度标尺决定。温度数据还表现出大约24 m的长度标度。这些数据和导出的能量通量之间的共谱显示了大约24 m的小尺度行为。这表明通量主要是对温度的小尺度差异做出响应（由于Fr数据在24 m处未观察到峰值），而不是分数植被的变化。在AVHRR的情况下，大规模可变性占主导。 Fr和温度之间的共谱显示出一个小规模的峰（2000 m），在这两个光谱中均未观察到。在蒸发Fr光谱中观察到了这种小规模的活动。这是由于表面的辐射平衡。对于AVHRR数据，初始像素大小太粗糙，无法观察到Fr的局部（场对场）变化，而该变化在高分辨率机载数据中的温度变化中占主导地位。在较粗的像素分辨率（2000 m）下，Fr空间变异性主导着温度数据的重要性，从而导致2000 m处蒸发的峰值。然而，在更大的规模上，Fr和温度都不是主要的，并且所产生的通量在两个场中都有很大的贡献。

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