Journal ArticleDOI
Cloud Detection Using Satellite Measurements of Infrared and Visible Radiances for ISCCP
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TLDR
In this article, the cloud detection part of the International Satellite Cloud Climatology Project (ISCCP) analysis is described, and the detection algorithm is supported by global, multiyear surveys of the statistical behavior of satellite-measured infrared and visible radiances to determine those characteristics that differentiate cloudy and clear scenes and how these characteristics vary among climate regimes.Abstract:
This paper, the first of three, describes the cloud detection part of the International Satellite Cloud Climatology Project (ISCCP) analysis. Key features of the cloud detection alogrithm are (1) use of space and time radiance variation tests over several different space and time domains to account for the global variety of cloudy and clear characteristics, (2) estimation of clear radiance values for every time and place, and, (3) use of radiance thresholds that vary with the type of surface and climate regime. Design of the detection algorithm was supported by global, multiyear surveys of the statistical behavior of satellite-measured infrared and visible radiances to determine those characteristics that differentiate cloudy and clear scenes and how these characteristics vary among climate regimes. A summary of these statistical results is presented to illustrate how the cloud detection method works in a variety of circumstances. The sensitivity of the results to changing test parameter values is determined to provide a first estimate of the uncertainty of ISCCP cloud amounts. These test results (which exclude polar regions) suggest detection uncertainties of about 10% with possible negative biases of 5% (especially at night).read more
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Journal ArticleDOI
Advances in understanding clouds from ISCCP
TL;DR: The progress report on the International Satellite Cloud Climatology Project (ISCCP) describes changes made to produce new cloud data products (D data), examines the evidence that these changes are improvements over the previous version (C data), summarizes some results, and discusses plans for the ISCCP through 2005.
Journal ArticleDOI
Discriminating clear sky from clouds with MODIS
Steven A. Ackerman,Kathleen I. Strabala,W. Paul Menzel,Richard A. Frey,Christopher C. Moeller,Liam E. Gumley +5 more
TL;DR: The MODIS cloud mask algorithm as discussed by the authors uses several cloud detection tests to indicate a level of confidence that the MEDIS is observing clear skies, which is ancillary input to MEDIS land, ocean, and atmosphere science algorithms to suggest processing options.
Journal ArticleDOI
PERSIANN-CDR: Daily Precipitation Climate Data Record from Multisatellite Observations for Hydrological and Climate Studies
Hamed Ashouri,Kuolin Hsu,Soroosh Sorooshian,Dan Braithwaite,Kenneth R. Knapp,L. Dewayne Cecil,Brian R. Nelson,Olivier P. Prat +7 more
TL;DR: In this paper, a new retrospective satellite-based precipitation dataset is constructed as a climate data record for hydrological and climate studies, which addresses the need for a consistent, long-term, high-resolution, and global precipitation dataset for studying the changes and trends in daily precipitation, especially extreme precipitation events, due to climate change and natural variability.
Journal ArticleDOI
Near-Global Survey of Effective Droplet Radii in Liquid Water Clouds Using ISCCP Data.
TL;DR: In this paper, a method based on a complete radiative transfer model for Advanced Very High Resolution Radiometer (AVHRR)-measured radiances is described for retrieving cloud particle radii in liquid water clouds from satellite data currently available from the International Satellite Cloud Climatology Project.
Journal ArticleDOI
Global inundation dynamics inferred from multiple satellite observations, 1993–2000
TL;DR: In this article, the authors presented the first global estimate of monthly inundated areas for 1993-2000, derived from a multisatellite method employing passive microwave land surface emissivities calculated from SSM/I and ISCCP observations, ERS scatterometer responses, and AVHRR visible and near-infrared reflectances.
References
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Book
Physics of Climate
José P. Peixoto,Abraham H. Oort +1 more
TL;DR: A review of the present understanding of the global climate system, consisting of the atmosphere, hydrosphere, cryosphere, lithosphere and biosphere, and their complex interactions and feedbacks is given from the point of view of a physicist as mentioned in this paper.
Journal ArticleDOI
ISCCP Cloud Data Products
TL;DR: The International Satellite Cloud Climatology Project (ISCCP) began in July 1983 and has been used to produce a global cloud climatology since then as mentioned in this paper, including visible and infrared images from an international network of weather satellites.
Journal ArticleDOI
Global Vegetation and Land Use: New High-Resolution Data Bases for Climate Studies
TL;DR: In this paper, a global vegetation and land-use data base (1° latitude by 1° longitude resolution) was compiled in digital form drawing upon approximately 100 published sources complemented by a large collection of satellite imagery.
Journal ArticleDOI
An improved method for detecting clear sky and cloudy radiances from AVHRR data
R. W. Saunders,K. T. Kriebel +1 more
TL;DR: In this article, the authors proposed a scheme to identify cloud-free and cloud-filled pixels (i.e. fields of view) from satellite radiance data, which consists of five daytime or five night-time tests applied to each individual pixel to determine whether that pixel is cloud free, partly cloudy or cloud filled.
Journal ArticleDOI
Thermal Equilibrium of the Atmosphere with a Convective Adjustment
TL;DR: The role of various gaseous absorbers (i.e., water vapor, carbon dioxide, and ozone) as well as the role of the clouds, is investigated by computing thermal equilibrium with and without one or two of these elements.