Author: Brian Hannon KahnPublisher:
ISBN:
Category :
Languages : en
Pages : 270
Book Description
The Detection and Characterization of Cirrus Cloud Properties from Simulated and Observed High-spectral-resolution Infrared Radiances
Author: Brian Hannon KahnAnalysis of Visible and Infrared Cirrus Cloud Optical Properties Using High Spectral Resolution Remote Sensing
Author: Daniel H. DeSloverInference of Cirrus Cloud Properties from Satellite-observed Visible and Infrared Radiances
Author: Patrick MinnisPublisher:
ISBN:
Category : Clouds
Languages : en
Pages : 322
Book Description
Scientific and Technical Aerospace Reports
Author: Study of Cloud Properties from Single-scattering, Radiative Forcing, and Retrieval Perspectives
Author: Yong-Keun LeePublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
This dissertation reports on three different yet related topics in light scattering computation, radiative transfer simulation, and remote sensing implementation, regarding the cloud properties and the retrieval of cloud properties from satellite-based infrared radiometric measurements. First, the errors associated with the use of circular cylinders as surrogates for hexagonal columns in computing the optical properties of pristine ice crystals at infrared (8-12 [micron]) wavelengths are investigated. It is found that the differences between the results for circular cylinders and hexagonal columns are on the order of a few percent at infrared wavelengths. Second, investigated in this dissertation are the outgoing broadband longwave and window channel radiances at the top-of-atmosphere under clear-sky conditions on the basis of the data acquired by the Cloud and the Earth's Radiant Energy System (CERES) instrument onboard the NASA Terra satellite platform. Based on the comparison of the observed broadband radiances with those obtained from rigorous radiative transfer simulations, it is found that the theoretical results tend to be larger than their measured counterparts. Extensive sensitivity studies regarding the uncertainties of various parameters were carried out. Within the considered uncertainties of various factors, the computed radiances are still larger than the observed radiances if thin cirrus clouds are excluded. Thus, a potential cause for the differences could be associated with the presence of thin cirrus clouds whose visible optical thickness is smaller than approximately 0.3. Third, presented in this dissertation is an illustration of the application of hyperspectral infrared channel observations to the retrieval of the cloud properties. Specifically, the hyperspectral measurements acquired from the Atmospheric Infrared Sounder (AIRS) aboard the NASA Aqua platform are used to infer cloud top pressure, effective cloud amount, cloud thermodynamic phase, cloud optical thickness, and the effective size of cloud particles. The AIRS-based retrievals are compared with the counterparts of the operational cloud products derived from the Moderate Resolution Imaging Spectroradiometer (MODIS). The two retrievals agree reasonably well except for the retrieved cloud effective particle size. Furthermore, the diurnal and seasonal contrasts of cloud properties are also investigated on the basis of the cloud properties retrieved from the AIRS data.
Cirrus
Author: David K. LynchPublisher: Oxford University Press, USA
ISBN: 0195130723
Category : Cirrus clouds
Languages : en
Pages : 499
Book Description
This text, devoted entirely to cirrus clouds, captures the state of knowledge of cirrus clouds and serves as a practical handbook as well.
Analysis of Cirrus Optical Properties with Data from NASA Er2 High-Resolution Interferometer Sounder (His)
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781725112667
Category :
Languages : en
Pages : 28
Book Description
The 8 to 13 micron spectral region is an important atmospheric window for radiometric studies of the Earth's surface and clouds. Most of the Earth-atmosphere longwave radiative loss to space occurs in this spectral region. Selective gaseous absorption in this window occurs in the 9.6 micron ozone band with the remaining absorption dominated by the water vapor continuum. Cirrus clouds have a large impact on the transmittance of this atmospheric window region; it is therefore important to understand the interaction of cirrus cloud with the radiation field for climate studies and in the interpretation of satellite radiometric measurements. The focus was to employ observations of the High-resolution Interferometer Sounder (HIS) made during First ISCCP Regional Experiment (FIRE) to improve the understanding of the radiative properties of cirrus clouds within this window region. Studies were undertaken to investigate the coupling between the microphysical properties of cirrus clouds and their spectral variation within this window region. Extensions of the HIS studies to satellite measurements, with regards to remote sensing and interpretation, were also investigated. Smith, William L. and Ackerman, Steven A. Unspecified Center NASA-CR-186365, NAS 1.26:186365 NAG1-1015...
Observing and Modelling the Impact of Arctic and Tropical Cirrus Clouds on Far-infrared Radiance Spectra
Author: Dissertation Abstracts International
Author: Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 810
Book Description
Cloud Composition Determination by Satellite Sensing Using the Nimbus VI High Resolution Infrared Sounder
Author: Robert G. FeddesPublisher:
ISBN:
Category : Clouds
Languages : en
Pages : 151
Book Description
The emphasis in this study is to detemine cloud compositions from satellites. The radiative transfer model of spectral infrared radiation in cloudy atmospheres is applied to the most complete set of radiance observations currently available from the Nimbus VI HIRS instrument. The radiative properties of clouds in the HIRS channels are investigated using the discrete-ordinate method for approximating the solution of the radiative transfer equation as it is applied to nonisothermal, inhomogeneous cloudy atmospheres. Analysis of the upwelling radiances from the model indicates that cirrus clouds decrease the upwelling radiance more than middle clouds and that multilayered middle and cirrus clouds are indistinguishable from thick cirrus clouds. Upwelling radiances in cirrus or middle cloud conditions for shortwave CO2 channels are decreased by a greater percentage from their clear column values than are the long-wave CO2 channel radiances.