Hayden Oswald 1 and Andrew Molthan 2 NASA Summer Intern, University of Missouri, Columbia, Missouri 1 NASA SPoRT Center, NASA/MSFC, Huntsville, Alabama.

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Presentation transcript:

Hayden Oswald 1 and Andrew Molthan 2 NASA Summer Intern, University of Missouri, Columbia, Missouri 1 NASA SPoRT Center, NASA/MSFC, Huntsville, Alabama 2

Motivation  The volume of satellite data available to forecasters has increased as new instruments and techniques have emerged.  The GOES-R satellite will provide a significant increase in data.  RGB compositing is a more effective way to visualize satellite data than single channel products alone.  RGB compositing can highlight features in the data that may not be visible in single channel products.  MODIS data was used to provide a preview of GOES-R capabilities.

RGB Imagery  The colors in RGB images have direct physical correlations.  A channel or channel difference is assigned to a color (red, green, or blue).  The contribution of each color to a pixel in the image is proportional to the contribution of its assigned channel/channel difference.  EUMETSAT has developed RGB techniques for use with SEVIRI which have been adapted to MODIS by SPoRT.  We will discuss RGB imagery in the context of two RGB products.

Nighttime Microphysics  Current observations and satellite products do not resolve nocturnal fog clearly.  Current satellite techniques Single channel (10.8µm) SPoRT spectral difference (10.8µm-3.9µm)  Nighttime Microphysics product helps to distinguish among high clouds, low clouds, and fog.  Utilizes MODIS channels/channel differences 12.0µm-10.8µm 10.8µm-3.9µm 10.8µm

Case Study: 24 November 2010, 0815Z 11 μm Infrared Image Visibility < 3 mi. 3 – 5 mi. 5 – 10 mi.

Case Study: 24 November 2010, 0815Z 11 μm – 3.9 μm Spectral Difference Image Visibility < 3 mi. 3 – 5 mi. 5 – 10 mi.

Case Study: 24 November 2010, 0815Z Multispectral Nighttime Microphysics image Visibility < 3 mi. 3 – 5 mi. 5 – 10 mi.

Nighttime Microphysics Summary  Advantages Nighttime microphysics imagery incorporates channels used in single channel and spectral difference products. Extent and depth of fog events is more clear than in single channel imagery. Provides a preview of GOES-R capabilities.  Disadvantages Unconventional color scheme. Appearance can be influenced by surface temperatures.  Conclusion The nighttime microphysics product provides a better technique for nocturnal fog detection than current techniques.

Air Mass  Air mass product helps to distinguish among synoptic-scale features, such as fronts and jets.  Utilizes MODIS channels/channel differences: 6.2 µm-7.3 µm 9.7 µm-10.8 µm 6.2 µm (inverted)  Current techniques Single channel water vapor imagery (GOES 6.7 µm)

Case Study: 16 April 2011, 0315Z 6.8 μm Water Vapor Image

Case Study: 16 April 2011, 0315Z Air Mass Multispectral Image

RUC Analysis Comparison

Air Mass Summary  Advantages RGB color characteristics increase certainty when identifying features. A wider range of features is visible in this imagery. Combines several channels into one product Can be used to identify vorticity maximums in some cases Provides a preview of GOES-R capabilities  Disadvantages Clouds can obscure frontal boundaries. Lower clouds can have similar colors as the air masses.  Conclusion The air mass product efficiently combines a larger volume of data to provide the operational community with a more versatile, accurate diagnostic tool than water vapor imagery.

Conclusion  The volume of available satellite data will continue to increase, especially after the implementation of GOES-R.  Efficient methods must be employed to utilize available data to its full potential.  RGB compositing provides a way to optimize multiple satellite data with a single product.  The nighttime microphysics product is an improvement to current nocturnal fog detection techniques.  The air mass product supplements water vapor imagery.  The NASA SPoRT Center will continue developing RGB satellite products for transition to NWS forecast offices.

Questions?