laps cloud analysis
DESCRIPTION
LAPS Cloud analysis. First Guess . METAR. METAR. METAR. OAR/ESRL/GSD/Forecast Applications Branch. 1. Cloud Analysis Flow Chart. Cloud Fraction 3-D Isosurface. (From radars and model first guess). Satellite use in LAPS / STMAS. (GOES / SEVIRI*). 11 micron IR (Imager) - PowerPoint PPT PresentationTRANSCRIPT
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LAPS Cloud
analysis
METARMETAR
METAR
OAR/ESRL/GSD/Forecast Applications Branch 1
First Guess
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Cloud Analysis Flow Chart
Cloud Fraction 3-D Isosurface
2
(From radars and model first guess)
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Satellite use in LAPS / STMAS
• 11 micron IR (Imager)
• 3.9 micron data (Imager)
• Visible (Imager - with terrain albedo database)
• CO2-Slicing method (Cloud-top pressure)
*2010 Paper with Italian Collaborators
• Cloud-Drift Winds
• Retrieved Soundings (T, Td)
OAR/ESRL/GSD/Forecast Applications Branch 3
(GOES / SEVIRI*)
Cloud Analysis
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Cloud / Reflectivity / Precip Type (1km 15-min analysis)
DIA
Obstructions to visibility along approach paths
4
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MADIS Solar GHI Obs (<= 15min, Defined in Metadata)
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Solar Radiation Web Page
Verified at station locations measuring global solar radiation
on time scales <= 15min
Mean Analyzed / Forecast
Mean Observed
RMS differences
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Global Horizontal Irradiance (GHI) Analysis
Derived from 3-D cloud fraction analysis and simple clear-sky solar radiation calculation• High Resolution (e.g. 1km)• Rapid Update (e.g. 15min)• Compares well with independent observations
GHI = Io t a f
• Io = Top of Atmosphere Normal Incident Radiation
• T = Overall Transmittance (0.73)• a = 0.9 * sin(altitude) + 0.1 * sin2(altitude)• f = cloud fraction term
OAR/ESRL/GSD/Forecast Applications Branch 8
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LAPS 1-km Cloud Fraction Analysis with Independent GHI Obs. Overlay
3-Frames at 15-minute
interval
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Global Horizontal Irradiance Analysis
+ Observations
3-Frames at 15-minute
interval
Utilizes GOES imageryand 3-D cloud analysisallowing rapid 1km resolution update