radiative transfer, modis and viirs, and the aeronet system north larsen north.larsen@lmco
DESCRIPTION
Radiative Transfer, MODIS and VIIRS, and the AERONET system North Larsen [email protected]. Todays Presentation. - PowerPoint PPT PresentationTRANSCRIPT
1
ASU MAT 591: Opportunities in Industry!
Radiative Transfer, MODIS and Radiative Transfer, MODIS and VIIRS, and the AERONET systemVIIRS, and the AERONET system
North LarsenNorth [email protected]@lmco.com
2
ASU MAT 591: Opportunities in Industry!
Todays Presentation
The Radiative Transfer Equation has evolved into a powerful expression which is used by the community for understanding problems from global warming to the development of sensors and data products.
Today an overview of the radiative transfer equation will be presented and a discussion into some of the NASA MODIS and NPOESS VIIRS sensors data products. There will also be a discussion of the AERONET data and the suite of sun photometers globally and how they are used by NASA.
These topics are at the forefront and cutting edge of the remote sensing commmunity currently.
3
ASU MAT 591: Opportunities in Industry!
Understanding the Earth’s Atmosphere
CloudsClouds
Aerosols
Water vapor
78% N2
21% O2
0.8% Ar< 0.2% trace gases
99% of Atmosphere
O3 (0-400 DU)
Temp
trop
osp
her
es t
rato
sph
ere
8–20 km
20-30 km
4
ASU MAT 591: Opportunities in Industry!
Radiative Transfer is the study of the transport of radiant energy through a scattering, absorbing, and scattering medium.
The Atmosphere is divided into numerous homogeneous layers each possessing its own optical depth, single scattering albedo, temperature, and phase function.
The boundary conditions specified at the top of the atmosphere are solar input, thermal emissivity, solar zenith angle. And at the bottom of the atmosphere are surface albedo, surface temperature, and the surface emissive properties.
Radiative Transfer
5
ASU MAT 591: Opportunities in Industry!
The Radiative Transfer Equation has evolved into a powerful expression which is used by the community for understanding problems from global warming to the development of sensors and data products.
Radiative Transfer
IO I
d
dI/d=Ioe-
Earth’s Surface
6
ASU MAT 591: Opportunities in Industry!
The Plane Parallel Atmosphere for Radiative Transfer
sensor
o
Fs=0 a=a() T=T()
=*
P()=P()
T=T(*)
Lambertian Surface
= cos()= ’’
A=Albedo
7
ASU MAT 591: Opportunities in Industry!
Radiative Transfer Equation
oePFa
TBa
IPdda
Id
dI
oos
),;,,(4
)())(())(1(
),,(),;,,(4
)(),,(
),,( 1
1
2
0
In Which: I Radiance being solved for (W/m2str-1) a Single Scattering Albedo (no units)P Phase Function (no units) Optical Depth (no units) Cosine of zenith angle (no units)B Planck function of temperature T (W/m2str-1) Fs Solar Flux input at the top of atmosphere (W/m2)
The Radiative Trnsfer Equation in Plane Parallel Atmospheres
8
ASU MAT 591: Opportunities in Industry!
Atmospheric Transmittance, Surface Reflectance, Solar Irradiance, and Imaginary Part of Refractive Index for Water and Ice, Visible (VIS) and Near Infrared
(NIR)
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Wavelength (microns)
Tra
ns
mit
tan
ce
/Re
fle
cta
nc
e/Ir
rad
ian
ce
1.00E-09
1.00E-08
1.00E-07
1.00E-06
1.00E-05
T_atm R_Veg R_Soil R_Snow R_Water Solar Irr K_Water K_Ice
H2O
Ima
gin
ary P
art o
f Re
frac
tive In
de
x
O3
O2H2O
O2H2O
O2
H2O H2O
H2O
O3
Visible to NIR Spectra
9
ASU MAT 591: Opportunities in Industry!
Atmospheric Transmittance, Surface Reflectance, Solar Irradiance,and Imaginary Part of Refractive Index for Water and Ice, Short Wave Infrared (SWIR)
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3
Wavelength (microns)
Tra
ns
mit
tan
ce
/Re
fle
cta
nc
e
1.00E-06
1.00E-05
1.00E-04
1.00E-03
1.00E-02
1.00E-01
1.00E+00
T_Atm R_Veg R_Soil R_Snow R_Water Solar Irr K_Water K_Ice
H2O
Irrad
ian
ce
(W c
m-2
um
)/Ima
gin
ary P
art o
f Re
frac
tive In
de
x
H2O
H2O H2OCO2
CO2
H2O
CH4
N2O
SWIR Spectra
10
ASU MAT 591: Opportunities in Industry!
Atmospheric Transmittance, Surface Reflectance, Solar/Emissive Radiance Fraction for Cloud, and Imaginary Part of Refractive Index for Water and Ice, Mid Wave Infrared
(MWIR)
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
3 3.2 3.4 3.6 3.8 4 4.2 4.4 4.6 4.8 5
Wavelength (microns)
Tra
ns
mit
tan
ce
/Re
fle
cta
nc
e/F
rac
tio
n o
f R
ad
ian
ce
1.0E-03
1.0E-02
1.0E-01
1.0E+00
T_Atm R_Veg R_Soil R_Snow R_Water Solar Emissive K_Water K_Ice
H2O
Ima
gin
ary P
art o
f Re
frac
tive In
de
x
CH4
CH4
H2O
N2O
CO2
H2O
MWIR Spectra
11
ASU MAT 591: Opportunities in Industry!
Atmospheric Transmittance, Surface Emissivity, Blackbody Emittance (300 K),and Imaginary Part of Refractive Index for Water and Ice, Long Wave Infrared (LWIR)
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
5 6 7 8 9 10 11 12 13 14 15
Wavelength (microns)
Tra
ns
mit
tan
ce
/Em
iss
ivit
y
1.0E-04
1.0E-03
1.0E-02
1.0E-01
1.0E+00
T_Atm E_Veg E_Soil E_Snow E_Water BB 300K K_Water K_Ice
Em
ittan
ce
(W c
m-2
um
)/Ima
gin
ary P
art o
f Re
frac
tive In
de
x
H2OH2O
O3
H2O
CO2
Thermal Spectra
12
ASU MAT 591: Opportunities in Industry!
Then and Now
First Image from TIROS-1 First Image from EOS-Terra
New Brunskwick and Nova Scotia (40 Years ago)
Mississippi Delta from MODISFeb 24, 2000
13
ASU MAT 591: Opportunities in Industry!
MODIS Sensor (2000-2006)
MODIS (or Moderate Resolution Imaging Spectroradiometer) is a key instrument aboard the Terra (EOS AM) and Aqua (EOS PM) satellites. Terra's orbit around the Earth is timed so that it passes from north to south across the equator in the morning, while Aqua passes south to north over the equator in the afternoon. Terra MODIS and Aqua MODIS are viewing the entire Earth's surface every 1 to 2 days, acquiring data in 36 spectral bands, or groups of wavelengths (0.4 – 15 microns). These data are improving our understanding of global dynamics and processes occurring on the land, in the oceans, and in the lower atmosphere. MODIS is playing a vital role in the development of validated, global, interactive Earth system models able to predict global change accurately enough to assist policy makers in making sound decisions concerning the protection of our environment.
14
ASU MAT 591: Opportunities in Industry!
MODIS Sensors Data Products
Radiance Aerosol Product Total Precipitable Water Atmospheric Profiles Gridded Atmospheric Product Cloud Mask and coverSurface Reflectance Land Surface Temperature and EmissivityLand Cover/Land Cover ChangeGridded Vegetation Indices (Max NDVI and Integrated MVI) Thermal Anomalies, Fires, and Biomass BurningLeaf Area Index, and FPAREvapotranspirationNet Photosynthesis and Primary Productivity
Surface ReflectanceVegetation CoverSnow CoverSea and Lake Ice CoverNormalized Water-leaving RadiancePigment ConcentrationChlorophyll FluorescenceChlorophyll a Pigment ConcentrationPhotosynthetically Available Radiation (PARSuspended-Solids ConcentrationOrganic Matter ConcentrationCoccolith ConcentrationOcean Water Attenuation CoefficientOcean Primary ProductivitySea Surface TemperaturePhycoerythrin ConcentrationTotal Absorption CoefficientOcean Aerosol PropertiesClear water Epsilon
15
ASU MAT 591: Opportunities in Industry!
The Great Barrier Reef (09/15/03)
16
ASU MAT 591: Opportunities in Industry!
Dust Storm Southern Afganistan (09/20/03)
17
ASU MAT 591: Opportunities in Industry!
Hurricane Isabel (09/17/03)
18
ASU MAT 591: Opportunities in Industry!
Forest Fires in Portugal (09/16/03)
Hurricane Isabel 09/17/2003
19
ASU MAT 591: Opportunities in Industry!
AERONET Network
The AERONET (Aerosol Robotic Network) is a global network of sunPhotometers which measure local the atmospheric properties hourly.
20
ASU MAT 591: Opportunities in Industry!
AERONET Network
Measurements are takenOf the AOT in 7 bands, andTotal Column water vaporIs measured also.
With this data validation ofMODIS and future VIIRSAlgorithms is performed andData products are improved
21
ASU MAT 591: Opportunities in Industry!
The VIIRS Sensor (2008-2018)
Visible/Infrared Imager Radiometer Suite VIIRS
DescriptionCollects visible/infrared imagery and radiometric data. Data types include atmospheric, clouds, earth radiation budget, clear-air land/water surfaces, sea surface temperature, ocean color, and low light visible imagery. Primary instrument for satisfying 26 EDRs.
SpecificationsSpecificationsMultiple VIS and IR channels between 0.3 and 12 Multiple VIS and IR channels between 0.3 and 12
micronsmicrons
Imagery Spatial Resolution: 350m @ NADIR / 700m @ Imagery Spatial Resolution: 350m @ NADIR / 700m @ EOSEOS
Heritage and Risk ReductionHeritage and Risk Reduction
POES - POES - Advanced Very High Resolution RadiometerAdvanced Very High Resolution Radiometer(AVHRR/3)(AVHRR/3)
DMSP -DMSP - Operational Linescan System (OLS) - MOLS onOperational Linescan System (OLS) - MOLS onF18-F20F18-F20
EOS - EOS - Moderate Resolution Imaging Moderate Resolution Imaging SpectroradiometerSpectroradiometer
(MODIS)(MODIS)NPP - NPP - Early validation of operational instrument andEarly validation of operational instrument and
algorithmsalgorithms
22
ASU MAT 591: Opportunities in Industry!
VIIRS data products
RadianceImageryCloud Cover ImageryCloud Type ImageryIce Edge Location ImageryIce Concentration ImagerySoil MoistureAerosol Optical ThicknessAerosol Size ParameterSuspended MatterCloud Base HeightCloud Cover/LayersCloud Effective Particle SizeCloud Optical ThicknessOcean Color/ChlorophyllSea Ice Age and Motion
Cloud Top HeightCloud Top PressureCloud Top TemperatureAlbedo (Surface)Land Surface TemperatureVegetation IndexSnow Cover/DepthSurface TypeCurrentsFresh Water IceIce Surface TemperatureLittoral Sediment TransportNet Heat FluxMass LoadingActive FiresPrecipitable Water
23
ASU MAT 591: Opportunities in Industry!
Why?
National Importance Civilian CommunityCivilian Community
– Timely, accurate, and cost-effective public Timely, accurate, and cost-effective public warnings and forecasts of severe weather events, warnings and forecasts of severe weather events, reduce the potential loss of human life and reduce the potential loss of human life and property and advance the national economyproperty and advance the national economy
– Support of general aviation, agriculture, and Support of general aviation, agriculture, and maritime communities aimed at increasing U.S. maritime communities aimed at increasing U.S. productivityproductivity
Military CommunityMilitary Community– Shift tactical and strategic focus from “coping Shift tactical and strategic focus from “coping
with weather” to anticipating and exploiting with weather” to anticipating and exploiting atmospheric and space environmental conditionsatmospheric and space environmental conditions
24
ASU MAT 591: Opportunities in Industry!
Why?
Protect Safety of Life and PropertyImprove Accuracy of Severe Weather Warnings
Increase in hurricane Increase in hurricane landfall forecast skill landfall forecast skill will save an estimated will save an estimated $1 million per mile of $1 million per mile of coastline that does coastline that does not have to be not have to be evacuatedevacuated
Improved early Improved early warnings mitigate the warnings mitigate the devastating effects of devastating effects of floods through floods through disaster planning and disaster planning and responseresponse
25
ASU MAT 591: Opportunities in Industry!
Why?
Maritime industry - Ocean Maritime industry - Ocean winds, waves, currents, and winds, waves, currents, and marine warnings and forecasts marine warnings and forecasts improve vessel routing for improve vessel routing for safety, fuel savings, and safety, fuel savings, and efficient operationsefficient operations
Commercial Commercial fishing industry fishing industry - knowledge of - knowledge of sea surface sea surface winds is critical winds is critical to shrimp to shrimp yields in the yields in the gulfgulf
Benefits to Industry
Agricultural industry - Agricultural industry - Fire monitoring, Fire monitoring, vegetation index, frost, vegetation index, frost, hail, and flood warnings hail, and flood warnings critical to productioncritical to production
26
ASU MAT 591: Opportunities in Industry!
Why?Other Benefits to the World Community
Ice Ice monitorinmonitoring for g for shipping shipping and oil and oil exploratioexplorationn
NPOESS will improve ability to predict El Niño. A 60% increase in El Niño forecast skill will save $183 million per year over 12 year period
Snow cover mapping - Snow cover mapping - spring flood predictionspring flood prediction
27
ASU MAT 591: Opportunities in Industry!
Thanks
• MODIS Images and information presented is from the NASA Goddard MODIS website
• NPOESS information is from the NPOESS IPO
• AERONET information is from the NASA Goddard AERONET Sun Photometer website