Author: Lisa ScalonePublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Retrieval of Cirrus Optical Properties in the Near-IR Spectral Range Within the NASA ATTREX Project
Author: Lisa ScaloneAnalysis 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...
Retrieval and Validation of Cirrus Cloud Properties with the Far-Infrared Sensor for Cirrus (Firsc) During Crystal-Face
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781721791309
Category :
Languages : en
Pages : 30
Book Description
This grant supported the principal investigator's analysis of data obtained during CRYSTAL-FACE by two submillimeter-wave radiometers: the Far-Infrared Sensor for Cirrus (FIRSC) and the Conical Scanning Submillimeter-wave Imaging Radiometer (CoSSIR). The PI led the overall FIRSC investigation, though Co-I Michael Vanek led the instrument component at NASA Langley. The overall CoSSIR investigation was led by James Wang at NASA Goddard, but the cirrus retrieval and validation was performed at the University of Colorado. The goal of this research was to demonstrate the submillimeter-wave cirrus cloud remote sensing technique, provide retrievals of ice water path (IWP) and median mass particle diameter (D(sub me)), and perform validation of the cirrus retrievals using other CRYSTAL-FACE datasets. Evans, K. Franklin Goddard Space Flight Center
FIRE Cirrus Science Results 1993
Author: David S. McDougalPublisher:
ISBN:
Category : Cirrus clouds
Languages : en
Pages : 232
Book Description
The Retrieval of Temperature and Infrared Optical Depth of Cirrus Cloud Using the ATSR.
Author: Cirrus Microphysical Properties from Stellar Aureole Measurements, Phase I.
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
While knowledge of the impact of aerosols on climate change has improved significantly due to the routine, ground-based, sun photometer measurements of aerosols made at AERONET sites world-wide, the impact of cirrus clouds remains much less certain because they occur high in the atmosphere and are more difficult to measure. This report documents work performed on a Phase I SBIR project to retrieve microphysical properties of cirrus ice crystals from stellar aureole imagery. The Phase I work demonstrates that (1) we have clearly measured stellar aureole profiles; (2) we can follow the aureole profiles out to 1̃/4 degree from stars (1̃/2 degree from Jupiter); (3) the stellar aureoles from cirrus have very distinctive profiles, being flat out to a critical angle, followed by a steep power-law decline with a slope of -̃3; (4) the profiles are well modeled using exponential size distributions; and (5) the critical angle in the profiles is 0̃.12 degrees, (6) indicating that the corresponding critical size ranges from 1̃50 to 2̃00 microns. The stage has been set for a Phase II project (1) to proceed to validating the use of stellar aureole measurements for retrieving cirrus particle size distributions using comparisons with optical property retrievals from other, ground-based instruments and (2) to develop an instrument for the routine, automatic measurement of thin cirrus microphysical properties.
Empirical Constraints on the Cosmic Infrared Background Using Near-Infrared Dirbe Data
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781721242788
Category :
Languages : en
Pages : 34
Book Description
Empirical models for emission from stars and the ISM are subtracted from the zodiacal-light-subtracted DIRBE 3.5 pm emission. Because the models are contaminated by unknown levels of the CM at other near-IR wavelength, the residual is not simply the 3.5 Jim Cosmic IR Background, but a linear combination of the background levels at several wavelengths. In spite of this, the residual can be used to place limits on the near-IR CIB intensity if its spectral shape is assumed. Additionally, the residual level is shown to be more nearly isotropic than previous estimates over a much larger fraction of the sky. An excellent correlation of near-IR and far-IR ISM emission provides evidence of the high accuracy of the brighter stellar emission model. The possibility that any residual emission is zodiacal in nature is discussed. Arendt, Richard G. Goddard Space Flight Center
Detection of the Near-IR Cosmic Infrared Background Using Alternative Models of Near-IR Galactic Emission in the Dirbe Data
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781721510573
Category :
Languages : en
Pages : 34
Book Description
The analysis portion of this task has been completed. New models were developed for the removal of the near-infrared emission of Galactic stars in the DIRBE data. Subtraction of these models from the observed emission attempted to achieve a better detection of the Cosmic Infrared Background at near-infrared wavelengths. The new models were found to provide a large improvement in the isotropy of the residual emission, however constraints on the intensity of the emission are not significantly improved. A paper detailing the procedures and results has been drafted, and will be completed next year. The draft of this paper is included as the final report on the contract. Arendt, Richard G. and Dwek, Eli and Oliversen, Ronald J. (Technical Monitor) Goddard Space Flight Center RTSC-3458
The Detection and Characterization of Cirrus Cloud Properties from Simulated and Observed High-spectral-resolution Infrared Radiances
Author: Brian Hannon KahnThe Future of Atmospheric Chemistry Research
Author: National Academies of Sciences, Engineering, and MedicinePublisher: National Academies Press
ISBN: 0309445655
Category : Science
Languages : en
Pages : 227
Book Description
Our world is changing at an accelerating rate. The global human population has grown from 6.1 billion to 7.1 billion in the last 15 years and is projected to reach 11.2 billion by the end of the century. The distribution of humans across the globe has also shifted, with more than 50 percent of the global population now living in urban areas, compared to 29 percent in 1950. Along with these trends, increasing energy demands, expanding industrial activities, and intensification of agricultural activities worldwide have in turn led to changes in emissions that have altered the composition of the atmosphere. These changes have led to major challenges for society, including deleterious impacts on climate, human and ecosystem health. Climate change is one of the greatest environmental challenges facing society today. Air pollution is a major threat to human health, as one out of eight deaths globally is caused by air pollution. And, future food production and global food security are vulnerable to both global change and air pollution. Atmospheric chemistry research is a key part of understanding and responding to these challenges. The Future of Atmospheric Chemistry Research: Remembering Yesterday, Understanding Today, Anticipating Tomorrow summarizes the rationale and need for supporting a comprehensive U.S. research program in atmospheric chemistry; comments on the broad trends in laboratory, field, satellite, and modeling studies of atmospheric chemistry; determines the priority areas of research for advancing the basic science of atmospheric chemistry; and identifies the highest priority needs for improvements in the research infrastructure to address those priority research topics. This report describes the scientific advances over the past decade in six core areas of atmospheric chemistry: emissions, chemical transformation, oxidants, atmospheric dynamics and circulation, aerosol particles and clouds, and biogeochemical cycles and deposition. This material was developed for the NSF's Atmospheric Chemistry Program; however, the findings will be of interest to other agencies and programs that support atmospheric chemistry research.