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  • Biases in droplet radii and optical depths of marine stratocumulus retrieved from MODIS imagery

    Creator:
    Boeke, Robyn C.
    Abstract:
    The 2007 Intergovernmental Panel on Climate Change assessment established that the effect of clouds on climate contributes the largest uncertainty in predicting the future climate. Satellite observations provide an opportunity for learning about the behavior of clouds. This thesis seeks to assess the accuracy of cloud properties retrieved from multispectral...
    Resource Type:
    Masters Thesis
    Full Text:
    opportunity for learning about the behavior of clouds. This thesis seeks to assess the accuracy of cloud

  • Properties of marine stratus and stratocumulus derived using collocated MODIS and CALIPSO observations

    Creator:
    Hayes, Christopher R.
    Abstract:
    Adiabatic parcel models suggest specific relationships between cloud thickness and cloud properties. Such relationships govern cloud radiative forcing and thus cloud feedbacks in the climate system. Current remote sensing techniques work well at measuring these properties in low-level cloud systems that are overcast. Significant biases exist, however, when measuring cloud...
    Resource Type:
    Masters Thesis
    Full Text:
    remain. Previous studies have shown that problems exist with current cloud remote sensing techniques

  • Properties of low-level marine clouds as deduced from advanced very high resolution radiometer satellite observations

    Creator:
    Chang, Fu-Lung
    Abstract:
    A radiation model was developed for retrieving cloud visible optical depth, droplet effective radius, and cloud top emission temperature using AVHRR satellite observations at 0.63, 3.7, and 11 μm. The model was used to determine the sensitivity of the retrieved properties to various approximations often employed in such retrievals. Droplet...
    Resource Type:
    Dissertation
    Full Text:
    Abstract James A. Cq*1c, Jr. A radiation model was developed for retrieving cloud visible optical depth

  • Identification of layered cloud occurrences from the Lidar In-Space Technology Experiment and advanced very high resolution radiometer imagery

    Creator:
    Stevermer, Amy J.
    Abstract:
    Realistic assessment of the vertical distribution of clouds, particularly the occurrence of multi-layered systems, is critical for accurate calculations of radiative transfer in general circulation models. Such information is also useful in the design and improvement of satellite retrieval techniques. Current methods for retrieving cloud properties from satellite data assume...
    Resource Type:
    Masters Thesis
    Full Text:
    Layered Cloud Occurrences from the Lidar In-Space Technology Experiment and Advanced Very High Resolution

  • Properties of semitransparent upper-level clouds deduced from multispectral imagery data

    Creator:
    Lin, Xijian
    Abstract:
    A multispectral retrieval method is developed on the 100 km regional scale to extract the temperature, particle size, fractional cover and 11-μm emissivity of clouds which may be semitransparent in the infrared based on emitted radiances. The scheme utilizes the nonlinear relationship between emitted radiances when clouds are semitransparent and...
    Resource Type:
    Dissertation
    Full Text:
    -layered cloud systems constitute equal proportions of 100km scale regions. For the upper-level, single

  • Improved determination of cloud-free radiances for oceans

    Creator:
    Burden, Arthur R.
    Abstract:
    Improvements have been made to the spatial coherence method for automatically determining cloud-free ocean radiances in satellite imagery by incorporating the spectral signatures of reflecting surfaces. The spatial coherence method relies on the fact that small-scale cloud-free regions typically exhibit uniform emission and uniform reflection. While small-scale overcast regions typically...
    Resource Type:
    Masters Thesis
    Full Text:
    Cloud-Free Radiances for Oceans Abstract Jam'çZoakley, Jr. Improvements have been made to the

  • Toward the estimation of errors in cloud cover derived by threshold methods

    Creator:
    Chang, Fu-Lung
    Abstract:
    The accurate determination of cloud cover amount is important for characterizing the role of cloud feedbacks in the climate system. Clouds have a large influence on the climate system through their effect on the earth's radiation budget. As indicated by the NASA Earth Radiation Budget Experiment (ERBE), the change in...
    Resource Type:
    Masters Thesis
    Full Text:
    Errors in Cloud Cover Derived by Threshold Methods Abstract appr James A. Cokley, Jr. The accurate