Mixed‐phase cloud (MC) is the dominant cloud type over the polar region, and there are challenging conditions for remote sensing and in situ measurements. In this study, a new methodology of retrieving the stratiform MC liquid water path (LWP) by combining Cloud‐Aerosol Lidar with Orthogonal Polarization (CALIOP) and infrared imaging radiometer (IIR) measurements was developed and evaluated. This new methodology takes the advantage of reliable cloud‐phase discrimination by combining lidar and radar measurements. An improved multiple‐scattering effect correction method for lidar signals was implemented to provide reliable cloud extinction near cloud top. Then with the adiabatic cloud assumption, the MC LWP can be retrieved by a lookup‐table‐based method. Simulations with error‐free inputs showed that the mean bias and the root mean squared error of the LWP derived from the new method are −0.23 ± 2.63 g/m2, with the mean absolute relative error of ~4%. Simulations with erroneous inputs suggested that the new methodology could provide reliable retrieval of LWP to support the statistical or climatology analysis. Two‐month A‐train satellite retrievals over Arctic region showed that the new method can produce very similar cloud top temperature (CTT) dependence of LWP to the ground‐based microwave radiometer measurements, with a bias of −0.78 g/m2 and a correlation coefficient of 0.95 between the two mean CTT‐LWP relationships. The new approach can also produce reasonable pattern and value of LWP in spatial distribution over the Arctic region.
Journal of Geophysical Research: Atmospheres – Wiley
Published: Jan 16, 2018
Keywords: ; ; ;
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