MODIS CLOUD RETRIEVAL: A presentation based on this document.

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Presentation transcript:

MODIS CLOUD RETRIEVAL: A presentation based on this document.

MODIS ATMOSPHERE PRODUCTS

Basic Idea Behind Cloud (and Snow) Retrievals Pg 9

Spectral Extinction Coefficient for Water Droplet Cloud: Refractive Index Effects

Probability of Photon Absorption for the same cloud as the last slide

Phase Function for Water Clouds as a function of Droplet Size fogbows glory forward diffraction peak and corona erical.blogspot.c om/2006/05/bri ght-fogbow- with- serveral.html

Geometical Optics Portion of the Phase function for Cirrus Clouds (no forward diffraction shown) halos /ice_crystal_halos/index.p hp/halo_display_from_upp er_bavaria enhanced specular backscatter

How Modis is used for Clouds solar thermal infrared

MODIS spectral bands and atmospheric transmittance for clear sky conditions

Summary of MODIS Bands Used

Basic Physics of the Reflectance Function

Cloud Albedo as a function of Water Droplet Size

window region Cloud Properties from Thermal Bands and near IR, including solar

Basis of retrieval of optical depth and effective radius from MODIS: Model and measurement comparison for water droplets Marine stratocumulus clouds near the Azores, 22 June 1992.

Cloud Screening: Convective Cumulonimbus Cloud Ice phase has lower reflectivity at 1.61 um and 2.13 microns than does equivalent water droplet cloud, due to the difference in refractive index of water and ice. These regions also have low brightness temperature and therefore are associated with cold cloud tops um has water vapor absorption. Less wv is above the cold clouds than the warm water droplet clouds.

Ice Cloud Retrieval: Effective Diameter

Ice Cloud Microphysics

Representative Ice Optics for 6 MODIS Bands: for the Distribution of the Previous Page

Optical Model For Surface Reflectivity

Ice Crystal Phase Function for 6 MODIS Bands