气候变化领域集成服务门户(CCPortal): Improving middle and high latitude cloud liquid water path measurements from MODIS

CCPortal

DOI	10.1016/j.atmosres.2020.105033
	Improving middle and high latitude cloud liquid water path measurements from MODIS
	Khanal S.; Wang Z.; French J.R.
发表日期	2020
ISSN	0169-8095
卷号	243
英文摘要	Three years of measurements from the Moderate Resolution Imaging Spectroradiometer (MODIS) instrument on Aqua satellite has been used to develop a new approach to quantify the well-known, yet unresolved zonal bias in MODIS LWP of marine clouds. This new method utilizes two parameters: the solar zenith angle and cloud heterogeneity index, both of which are available for each MODIS pixel. Comparisons with collocated satellite and ground-based microwave measurements in carefully screened clouds shows that this new approach can effectively remove this large first order MODIS LWP bias. Applying this new approach to MODIS pixel level data collocated along the CloudSat footprint suggests annually averaged MODIS LWP overestimation gradually increases at higher latitudes and can reach over 50 g/m2 at latitudes greater than around 500. This overestimation can exceed 100 g/m2 for seasonal or monthly averages. MODIS LWP measurements were also reprocessed over land and snow/ice regions by eliminating data points with optical depth of 150, which indicates significant 3D bias. This reduces the average LWP by over 100 g/m2 in polar regions. The new and improved MODIS LWP dataset can be used to study related cloud processes and to constrain model simulations, especially in polar regions where observational dataset is limited and contain large uncertainties. © 2020 Elsevier B.V.
关键词	Large dataset Pixels Aqua satellites Cloud heterogeneity Cloud liquid water path High Latitudes Higher latitudes Model simulation Moderate resolution imaging spectroradiometer Solar zenith angle Radiometers Aqua (satellite)cloud water latitudinal gradient measurement method MODIS pixel polar region zenith angle
语种	英语
来源机构	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132417
推荐引用方式 GB/T 7714	Khanal S.,Wang Z.,French J.R.. Improving middle and high latitude cloud liquid water path measurements from MODIS[J]. Atmospheric Research,2020,243.
APA	Khanal S.,Wang Z.,&French J.R..(2020).Improving middle and high latitude cloud liquid water path measurements from MODIS.,243.
MLA	Khanal S.,et al."Improving middle and high latitude cloud liquid water path measurements from MODIS".243(2020).