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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

  • Estimating ground cover via spectral data

    Creator:
    Axness, Daniel S.
    Abstract:
    Potato ground cover and spectral data were measured in the Columbia Basin during the 1990 growing season. Three spectral were correlated with ground cover; normalized difference, near infrared-red ratio, and the first derivative of the spectral curve at 750 nm. All models were statistically significant at the 99% level. Normalized...
    Resource Type:
    Masters Thesis
    Full Text:
    Research Based on Vegetation Indices 12 2.4 Techniques of Field Remote Sensing 17 CHAPTER 3 Leaf Area

  • Development of 2D models to estimate nearshore bathymetry and sediment transport

    Creator:
    Splinter, Kristen D.
    Abstract:
    We examine the interactions and feedbacks between bathymetry, waves, currents, and sediment transport. The first two pro jects focus on the use of remote sensing techniques to expand our knowledge of the nearshore. Due to the plethora of snap-shot data that is available from satellites and their distribution via Google...
    Resource Type:
    Dissertation
    Full Text:
    transport. The first two projects focus on the use of remote sensing techniques to expand our knowledge of

  • Satellite infrared measurement of sea surface temperature : empirically evaluating the thin approximation

    Creator:
    Kowalski, Andrew S.
    Abstract:
    Satellite technology represents the only technique for measuring sea surface temperatures (SSTs) on a global scale. SSTs are important as boundary conditions for climate and atmospheric boundary layer models which attempt to describe phenomena of all scales, ranging from local forecasts to predictions of global warming. Historical use of infrared...
    Resource Type:
    Masters Thesis
    Full Text:
    Infrared Measurement of Sea Surface Temperature: Empirically Eval- uating the Thin Approximation Abstract