Sky thermal imaging using a ground-based camera

云量的演变和特性将通过使用热成像仪以独特的方式进行探索。虽然已经确定了随着云量增加，向下长波强迫增加，但尚未观察到这种关系的预期线性。我们将进一步发展一种新的方法，从热成像推断白天和夜晚的云量，并将与云高计反演的云量进行验证。目的二：反演云长波强迫。云长波强迫将通过同时减去晴空和云通量直接从图像中导出。

The evolution and properties of cloud cover will be explored in a unique way by using a thermal camera. Although the increase in downward long-wave forcing with increased cloud cover has been established, the expected linearity of this relationship has not been observed Aim 1: To measure cloud cover day and night. We will develop further a novel way of inferring cloud cover from thermal imaging during day and night.Validation against ceilometer derived cloud cover will be made. Aim 2: To retrieve cloud longwave forcing. Cloud longwave forcing will be derived directly from the image by simultaneously subtracting clear sky and cloud fluxes.