Download or read book Cloud and Aerosol Optics by Polarized Micro Pulse Lidar and Ground Based Measurements of Zenith Radiance written by Rodrigo Delgadillo and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Clouds impact Earth's climate through cloud transmission and reflection properties. Clouds reflect approximately 15 percent of the incoming solar radiation at the top of the atmosphere. A key cloud radiative variable is cloud optical depth, which gives information about how much light is transmitted through a cloud. Historically, remote measurements of cloud optical depth have been limited to uniform overcast conditions and had low temporal and spatial resolution. We present a novel method to measure cloud optical depth for coastal regions from spectral zenith radiance measurements for optically thin clouds, which removes some of these limitations. Our measurement site is part of South Florida's Cloud-Aerosol-Rain Observatory (CAROb), located on Virginia Key, FL (6 km from Miami). This work is based on Marshak et al.'s [1] method for finding cloud optical depth from vegetative sites that provide a strong spectral contrast between red and near infrared surface albedo. However, given the unique nature of our site, which contains water, vegetation, beach, and urban surface types, we found no such spectral contrast at those wavelength pairs. We measured albedo, with hyperspectral resolution, for different surface types around our measurement site to estimate the effective spectral albedo for the area centered on the site with a 5km radius. From this analysis, we found the best possible albedo contrast (573.9 and 673.1 nm) for our site. We tested the derived cloud optical depth from zenith radiance at these two wavelengths against a concurrently running polarized micro pulse LIDAR (MPL) and found good agreement.
Download or read book Science Plan for the Atmospheric Radiation Measurement Program ARM written by and published by . This book was released on 1996 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Determination of Cirrus Cloud Optical Properties Using Ground based Atmospheric Emitted Radiance Interferometer and Raman Lidar Measurements written by Daniel H. DeSlover and published by . This book was released on 2004 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cloud Optics written by Alexander A. Kokhanovsky and published by Springer Science & Business Media. This book was released on 2011-03-07 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Clouds affect the climate of the Earth, and they are an important factor in the weather. Therefore, their radiative properties must be understood in great detail. This book summarizes current knowledge on cloud optical properties, for example their ability to absorb, transmit, and reflect light, which depends on the clouds’ geometrical and microphysical characteristics such as sizes of droplets and crystals, their shapes, and structures. In addition, problems related to the image transfer through clouds and cloud remote sensing are addressed in this book in great detail. This book can be an important source of information on theoretical cloud optics for cloud physicists, meteorologists and optical engineers. All basic ideas of optics as related to scattering of light in clouds (e.g. Mie theory and radiative transfer) are considered in a self consistent way. Consequently, the book can also be a useful textbook to newcomers to the field.
Download or read book Use of the ARM Measurements of Spectral Zenith Radiance for Better Understanding of 3D Cloud Radiation Processes Aerosol Cloud Interaction written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This project focuses on cloud-radiation processes in a general three-dimensional cloud situation, with particular emphasis on cloud optical depth and effective particle size. The proposal has two main parts. Part one exploits the large number of new wavelengths offered by the Atmospheric Radiation Measurement (ARM) zenith-pointing ShortWave Spectrometer (SWS), to develop better retrievals not only of cloud optical depth but also of cloud particle size. We also take advantage of the SWS' high sampling resolution to study the "twilight zone" around clouds where strong aerosol-cloud interactions are taking place. Part two involves continuing our cloud optical depth and cloud fraction retrieval research with ARM's 2-channel narrow vield-of-view radiometer and sunphotometer instrument by, first, analyzing its data from the ARM Mobile Facility deployments, and second, making our algorithms part of ARM's operational data processing.
Download or read book Assessing the Performance of Several Modis Level 2 Cloud and Aerosol Products Against a Surface Based Polarization Cloud Lidar at Fairbanks AK written by Patrick Cobb and published by . This book was released on 2008 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Global Circulation Models (GCMs) currently suffer from inadequate cloud and aerosol parameterizations due to a shortage of information regarding how clouds and aerosols are globally distributed in space and time. Although surface and airborne instruments can offer reliable cloud and aerosol measurements, such methods are expensive, and their scope is rather limited. Satellite instruments, such as the MODerate resolution Imaging Spectroradiometer (MODIS), may provide an alternative. MODIS measures spectral radiance in thirty-six discreet spectral bands. A variety of cloud and aerosol properties are derived at the pixel scale from these measurements using algorithms developed from radiative transfer theory. A comprehensive validation campaign is underway to assess the quality of these data in hopes that it can be assimilated into the GCMs. This thesis provides one such study comparing the MODIS cloud mask, cloud top properties, cloud thermodynamic phase and aerosol type with overlapping surface data from a polarization cloud lidar at Fairbanks, AK. Most of the sample is comprised of cirrus clouds, which are difficult to detect with satellites. Results are mixed, but are generally consistent with past studies. The MODIS products are fairly dependable, but the algorithms could be improved, especially over the polar regions"--Leaf iii.
Download or read book Use of the ARM Measurement of Spectral Zenith Radiance For Better Understanding Of 3D Cloud Radiation Processes and Aerosol Cloud Interaction written by and published by . This book was released on 2010 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Our proposal focuses on cloud-radiation processes in a general 3D cloud situation, with particular emphasis on cloud optical depth and effective particle size. We also focus on zenith radiance measurements, both active and passive. The proposal has three main parts. Part One exploits the "solar-background" mode of ARM lidars to allow them to retrieve cloud optical depth not just for thin clouds but for all clouds. This also enables the study of aerosol cloud interactions with a single instrument. Part Two exploits the large number of new wavelengths offered by ARM's zenith-pointing ShortWave Spectrometer (SWS), especially during CLASIC, to develop better retrievals not only of cloud optical depth but also of cloud particle size. We also propose to take advantage of the SWS's 1 Hz sampling to study the "twilight zone" around clouds where strong aerosol-cloud interactions are taking place. Part Three involves continuing our cloud optical depth and cloud fraction retrieval research with ARM's 2NFOV instrument by, first, analyzing its data from the AMF-COPS/CLOWD deployment, and second, making our algorithms part of ARM's operational data processing.
Download or read book Cloud and Aerosol Properties Measured with a Lidar in the High Arctic at Eureka written by Christopher Perro and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physics Briefs written by and published by . This book was released on 1988 with total page 918 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the Atmospheric Radiation Measurement ARM Science Team Meeting written by and published by . This book was released on 1998 with total page 912 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monte Carlo Simulation of Detection of Cirrus Cloud Properties by Micro Pulse Lidar written by James A. Cotturone and published by . This book was released on 1996-05-01 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of the Micro Pulse Lidar (MPL) provides researchers with a system capable of continuous, eye-safe monitoring of atmospheric properties. The MPL operates with low energy, high pulse repetition frequency radiation in the visible portion of the spectrum. To investigate the interaction between visible radiation and atmospheric constituents, a model using Monte Carlo techniques has been refined to simulate MPL return profiles. An inherent feature of the MPL is its narrow receiver field of view (FOV) which is necessary to limit background noise. The effect of such a FOV and the role multiple scattering effects play in MPL operations are investigated in this study. Cloud base height and the radiative properties of cirrus clouds are important for determining the radiation budget of the planet. Inferred cirrus cloud radiative properties vary with the type of crystals assumed to compose the model clouds. To properly model optically thin clouds, it is important to include a standard background atmosphere composed of Rayleigh and aerosol scatterers. Its inclusion allows one to take advantage of information deduced from both the cloud and above-cloud layer. Information that is unavailable when sampling optically thick clouds. This capability plays a pivotal role in an inversion algorithm that is developed and described. It is shown that the algorithm allows one to infer important cloud optical properties such as volume extinction coefficient, cloud optical depth, and isotropic backscatter to extinction ratio, also known as the lidar ratio.
Download or read book Lidar Technologies Techniques and Measurements for Atmospheric Remote Sensing V written by Upendra N. Singh and published by SPIE-International Society for Optical Engineering. This book was released on 2009 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of SPIE present the original research papers presented at SPIE conferences and other high-quality conferences in the broad-ranging fields of optics and photonics. These books provide prompt access to the latest innovations in research and technology in their respective fields. Proceedings of SPIE are among the most cited references in patent literature.
Download or read book A polar cloud analysis based on micro pulse lidar measurements at Ny Alesund Svalbard and Syowa Antarctica written by M. SHIOBARA and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Observations of Aerosol and Liquid water Clouds with Dual Field of View Polarization Lidar written by Cristofer Andrés Jiménez Jiménez and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lidar Technologies Techniques and Measurements for Atmospheric Remote Sensing XII written by Upendra N. Singh and published by . This book was released on 2017-02-28 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of SPIE present the original research papers presented at SPIE conferences and other high-quality conferences in the broad-ranging fields of optics and photonics. These books provide prompt access to the latest innovations in research and technology in their respective fields. Proceedings of SPIE are among the most cited references in patent literature.
Download or read book Lidar Technologies Techniques and Measurements for Atmospheric Remote Sensing VII written by Upendra N. Singh and published by . This book was released on 2011-09-30 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes Proceedings Vol. 7821
Download or read book A Comparison Between SAGE II Aerosol Extinction and Ground based Lidar Measurements written by M.T. Osborn and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
