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首页> 外文期刊>IEEE Geoscience and Remote Sensing Letters >Temporal Decorrelation of Tropical Dense Forest at C-Band: First Insights From the TropiScat-2 Experiment
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Temporal Decorrelation of Tropical Dense Forest at C-Band: First Insights From the TropiScat-2 Experiment

机译：C波段热带致密森林的时间去相关性：Tropistat-2实验的首先见解

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摘要

Following the past TropiScat and AfriScat tower-based scatterometer experiments conducted as part of the European Space Agency (ESA) BIOMASS mission preparation activities, a follow-on experiment referred to as TropiScat-2 has been undertaken in French Guiana since March 2018. Based on new capabilities including C-band acquisitions, this letter addresses the question of temporal decorrelation variability at several time scales using a period of 67 days dating back to early August 2018. Overall, C-band coherences have been found very dependent on the reference hour and higher than expected at night (15-min coherences above 0.75 and 1-h coherences above 0.5 75% of the time). Supported by meteorological data from the flux-tower, clear evidence about diurnal convective effects is shown. For the first time, the link with evapotranspiration is pointed out based on a drop of the 15-min coherences going from about 0.8 to 0.2 in less than 1 h (around 7h30) and before the rise of convective winds. Furthermore, the specific impacts of convective winds during the day have been demonstrated using very short timescales (with the spread of coherences at 1 s from 0 to 0.9), whereas it is more difficult to separate these effects from those of water transfer for longer timescales. In addition to providing new insights for the understanding of microwave interactions with dense vegetation, these results should also contribute to widen the capabilities of future companion or high revisit space-borne missions at C-band.
机译：在过去的Tropistat和Afriscat塔的散射仪实验之后作为欧洲航天局（ESA）生物量任务准备活动的一部分，自2018年3月以来，在法国圭亚那曾在法国圭亚那进行了后续实验。这封信在包括C频段采集的新能力，在2018年8月初期的时间为67天的时间尺度地解决了时间去相关性变异性的问题。总体而言，C波段一致性已经依赖于参考小时和晚上高于预期（在0.75以上15分钟的一致性，1-H次相干在0.5 75％以上）。由来自磁通塔的气象数据支持，显示有关昼夜对流效应的明确证据。首次，基于15分钟的一滴相干在少于1小时（大约7H30）和对流风中的升高之前，基于15分钟的一滴连杆来指出与蒸散的连杆。此外，使用非常短的时间尺度对对流风的特定影响已经使用了非常短的时间表（以0至0.9的速度为1 s的涂抹，而更难以将这些效应与水转移更长的时间更长。除了为对密集植被的微波互动的理解提供新的洞察外，这些结果还应该有助于扩大C-Band的未来伴侣或高recisit空间所得道理的能力。

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