1 / 10

LAPS Cloud analysis

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)

karly-mendez
Download Presentation

LAPS Cloud analysis

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. LAPS Cloud analysis First Guess  METAR METAR METAR OAR/ESRL/GSD/Forecast Applications Branch 1

  2. Cloud Analysis Flow Chart Cloud Fraction 3-D Isosurface (From radars and model first guess)

  3. Satellite use in LAPS / STMAS (GOES / SEVIRI*) • 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) Cloud Analysis OAR/ESRL/GSD/Forecast Applications Branch 3

  4. Cloud / Reflectivity / Precip Type (1km 15-min analysis) Obstructions to visibility along approach paths DIA

  5. MADIS Solar GHI Obs (<= 15min, Defined in Metadata)

  6. Solar Radiation Web Page Verified at station locations measuring global solar radiation on time scales <= 15min Mean Analyzed / Forecast Mean Observed RMS differences

  7. 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

  8. LAPS 1-km Cloud Fraction Analysis with Independent GHI Obs. Overlay 3-Frames at 15-minute interval

  9. Global Horizontal Irradiance Analysis + Observations 3-Frames at 15-minute interval Utilizes GOES imagery and 3-D cloud analysis allowing rapid 1km resolution update

More Related