气候变化领域集成服务门户(CCPortal): Observations of Nighttime Clouds Over Chiba, Japan, Using Digital Cameras and Satellite Images

CCPortal

DOI	10.1029/2021JD034772
	Observations of Nighttime Clouds Over Chiba, Japan, Using Digital Cameras and Satellite Images
	Lagrosas N.; Shiina T.; Kuze H.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:17
英文摘要	Nighttime cloud cover (CC) is analyzed from the data observed for 34 months over Chiba, Japan, using continuously operated digital cameras. The normal camera works in the visible region, providing quantitative and temporal changes of nighttime CC. The second camera captures sky images without the near-infrared cut filter, and by applying the thresholding method, we obtain information on the temporal changes of thin (pixel values between 72 and 115) and thick (>115) clouds. Comparing the CC from the visible camera with cloud fraction from Atmospheric Infrared Sounder (AIRS) shows that long-term data from the camera are valuable for correcting the underestimation of the cloud fraction product from AIRS for low-level clouds. Furthermore, a comparison between the near-ground temperature and CC results in estimating the seasonal changes of feedback effects of upward thermal radiation from the ground. The current results reveal that thick clouds contribute to longwave cloud forcing (LWCF) below 100 Wm−2, while thin clouds with CC below 30% contribute to LWCF below 10.2 Wm−2. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	AIRS; cloud cover; digital camera; Himawari; longwave cloud forcing; nighttime clouds
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/237043
作者单位	Center for Environmental Remote Sensing, Chiba University, Chiba, Japan; Graduate School of Science and Engineering, Chiba University, Chiba, Japan
推荐引用方式 GB/T 7714	Lagrosas N.,Shiina T.,Kuze H.. Observations of Nighttime Clouds Over Chiba, Japan, Using Digital Cameras and Satellite Images[J],2021,126(17).
APA	Lagrosas N.,Shiina T.,&Kuze H..(2021).Observations of Nighttime Clouds Over Chiba, Japan, Using Digital Cameras and Satellite Images.Journal of Geophysical Research: Atmospheres,126(17).
MLA	Lagrosas N.,et al."Observations of Nighttime Clouds Over Chiba, Japan, Using Digital Cameras and Satellite Images".Journal of Geophysical Research: Atmospheres 126.17(2021).