Subgrid-scale cirrus observed by lidar at mid-latitude: variability effects of the cloud optical depth

Optical and geometrical characteristics of cirrus clouds over a mid-latitude lidar station

control of the optical properties of nanoparticles by laser fields

در این پایان نامه، درهمتنیدگی بین یک سیستم نقطه کوانتومی دوگانه(مولکول نقطه کوانتومی) و میدان مورد مطالعه قرار گرفته است. از آنتروپی ون نیومن به عنوان ابزاری برای بررسی درهمتنیدگی بین اتم و میدان استفاده شده و تاثیر پارامترهای مختلف، نظیر تونل زنی(که توسط تغییر ولتاژ ایجاد می شود)، شدت میدان و نسبت دو گسیل خودبخودی بر رفتار درجه درهمتنیدگی سیستم بررسی شده اشت.با تغییر هر یک از این پارامترها، در...

Microphysical and Dynamical Influences on Cirrus Cloud Optical Depth Distributions

Cirrus cloud inhomogeneity occurs at scales greater than the cirrus radiative smoothing scale (~100 m), but less than typical global climate model resolutions (~300 km). Therefore, calculating cirrus radiative impacts in global climate models requires an optical depth distribution parameterization. Radiative transfer calculations are sensitive to optical depth distribution assumptions (Fu et al...

Microphysical Properties of Mid-latitude Cirrus Clouds Observed with Hydrometeor Videosonde

High-level ice clouds play a complex role in the global energy budget by affecting infrared radiation emitted by the earth’s surface. In order to understand the climate system, it is necessary to increase our knowledge about the microphysical, radiative, and optical properties of cirrus clouds. In situ measurements on microphysical structures of cirrus clouds have been made by using special, hi...

The Effect of Cloud Geometrical Thickness Variability on Optical Depth

The formulation of the cloud-radiation feedback is compounded by extreme variability of clouds over a wide range of scales. In this study, we address the problem of geometry and spatial inhomogeneity in stratiform cloud layers and its influence on cloud optical depth. The investigation is based on the Cooperative Institute for Mesoscale Meteorological Studies (CIMMS) large eddy simulation model...