postbrief/science meeting 3:00 tue 8 jul 2008
DESCRIPTION
Summary of ARCTAS P-3 Data Flight #21 Flown 7 Jul 2008 Phil Russell, NASA Ames with contributions from many, many experimenters, modelers, forecasters, & P-3 air & flight crews. Postbrief/Science Meeting 3:00 Tue 8 Jul 2008. AOD, 0Z,7/8. STEM Model prediction (U Iowa): July 7 P3 Flight. - PowerPoint PPT PresentationTRANSCRIPT
Summary ofARCTAS P-3 Data Flight #21
Flown 7 Jul 2008
Phil Russell, NASA Ameswith contributions from many, many
experimenters, modelers, forecasters, & P-3 air & flight crews
Postbrief/Science Meeting
3:00 Tue 8 Jul 2008
AOD, 0Z,7/8
STEM Model prediction (U Iowa): July 7 P3 Flight
GEOS5 Forecast: July 7 P3 Flight
Lots of aerosols in the Siberian fire/Asian anthro. Plume, including sulfate, dust, OC, & BC.
GEOS5 Forecast: July 7 P3 Flight
No significant California fire or N. American pollution.
A strong Siberia fire/Asian anthropogenic plume between 7-10 km.Weak Siberia fire/Asian anthropogenic plumes between 1-6 km.
P-3 in ARCTAS: PayloadAmes Airborne Tracking
Sunphotometer (AATS-14)
Solar Spectral Flux Radiometer (SSFR)
Broad-Band Radiometers (BBR)
LW SW
HiGEAR Aerosols & O3
OPC & DMA dry size dist, volatility Tandem Volatility DMA Neph scat + PSAP abs Humidified Neph f(RH) Ultrafine & CN Time of Flight Mass Spec size resolved chemistry SP2 black carbon mass
AERO3X Cloud Absorption Radiometer (CAR)
P-3 Data System (PDS): Nav, Flight, Met (P, T, RH, …) REVEAL & RTMM
AOD Ext H2O vapor
Cavity Ringdown ext (2) Reciprocal Neph sca (2, RH ) Radiance, BRDF
Flux↑,↓(), albedo()
Flux↑,↓, albedo
Nenes CCN PVM cloud drop reff, vol
TECO O3
COBALT: CO
AOD, 0Z,7/8P3 Plan A Mon 7 Jul
Goals:1.Asian-Siberian plume above low cloud in A-Train footprints (in situ aer, CO, O3, rad gradient & stack, CAR cloud BRDF, CALIPSO val, aer effects on MODIS PM cloud retrievals)2.Ice Field BRDF3.Clear-sky work at WP 6 as fallback.
P3 Plan B Mon 7 Jul
Goals:1.Asian-Siberian plume above Saturn Island AERONET (in situ aer, CO, O3 -AATS spiral, rad gradient & stack, CAR-AERONET)2.Ice Field BRDF3.Clear-sky work at WP 6 as fallback.
AOD = 0.49 on 6 Jul
AOD, 0Z,7/8
GEOS5 Forecast: July 7 P3 Flight - Clouds
Some middle and high clouds near Cold Lake.Close to Vancouver and Victoria island, some low clouds but no middle/high clouds.
AOD, 0Z,7/8
AOD, 0Z,7/8P3 Actual Mon 7 Jul
Accomplishments:1.Aerosol radiative forcing efficiency (F/AOT) under edge of advancing Asian/Siberian plume2.Aerosol effects on MODIS-Terra cloud remote sensing3.Tests of model aerosol, CO, & O3 predictions @ many locations4.Radiant flux divergence stacks for SSA() @ 2 locations5.CAR circles over AERONET for CAR-AERONET retrievals6.3-way closure (in situ, AATS, AERONET) in spiral
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04/21/2304/21/23 08:24 PM08:24 PM J. Redemann, P. Pilewskie, P. Russell. NASA Ames & U. ColoradoJ. Redemann, P. Pilewskie, P. Russell. NASA Ames & U. Colorado1212
Climate Change Science in INTEX-A/ICARTT Climate Change Science in INTEX-A/ICARTT Measurements of Aerosol Effects on the Measurements of Aerosol Effects on the
Solar Energy that Drives ClimateSolar Energy that Drives Climate
So
lar
ener
gy
[W m
So
lar
ener
gy
[W m
-2-2]]
Aerosol Amount, Aerosol Amount, AOD(499 nm)AOD(499 nm)
Jetstream 31 (J31)
Fo
rcin
g E
ffic
ien
cy [
W m
Fo
rcin
g E
ffic
ien
cy [
W m
-2-2]]
CaseCase
Slope =Aerosol Radiative Forcing Efficiency
Case 2,
21 Jul2004
Scientific Conclusions
1.The gradients (spatial variations) in AOD that occur frequently off the US East coast provide a natural laboratory for studying effects of aerosol particles on solar energy, and hence on climate.
2.For the average aerosol optical depth of ~0.5 in the 10 cases shown above, aerosols on average reduced the incident visible radiation (near midday) by the amount of energy it would take to power one 40 W light bulb for every square meter of ocean surface (0.5 x -80 W m-2 = -40 W m-2; see right frame above).
Redemann et al., Redemann et al., JGRJGR, 2006, 2006
Boreal Forest Fire Boreal Forest Fire Smoke Early in Smoke Early in INTEX-AINTEX-A
AOD, 0Z,7/8P3 Actual Mon 7 Jul
Accomplishments:1.Aerosol radiative forcing efficiency (F/AOT) under edge of advancing Asian/Siberian plume2.Aerosol effects on MODIS-Terra cloud remote sensing3.Tests of model aerosol, CO, & O3 predictions @ many locations4.Radiant flux divergence stacks for SSA() @ 2 locations5.CAR circles over AERONET for CAR-AERONET retrievals6.3-way closure (in situ, AATS, AERONET) in spiral
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S. Howell et al., HiGEAR
PRELIMINARY
AOD, 0Z,7/8P3 Actual Mon 7 Jul
Accomplishments:4. Radiant flux divergence stacks for SSA() @ 2 locations5. CAR circles over AERONET for CAR-AERONET retrievals6. 3-way closure (in situ, AATS, AERONET) in spiral
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Downwelling Flux: F
Upwelling Flux: F
Net Flux: F- F
Flux Divergence (absorption):
(F- F)2000m- (F- F)43m
Fractional absorption:
[(F- F)2000m- (F- F)43m]/ F2000m
2000 m
43 m
Background on Radiative Flux Divergence & Closure, Absorption Spectra, etc.
P. Russell, DOE-ASP Meeting, Annapolis, MD, 27 Feb 2008P. Russell, DOE-ASP Meeting, Annapolis, MD, 27 Feb 2008
P. Russell, Earth Science Seminar, NASA Ames, 19 July 2007P. Russell, Earth Science Seminar, NASA Ames, 19 July 2007
Aerosol Aerosol AbsorptionAbsorption Optical Depth (AAOD) Spectra Optical Depth (AAOD) Spectra from 5 Experimentsfrom 5 Experiments
Wavelength, nm
Ab
so
rpti
on
Op
tica
l Dep
th
Bergstrom et al., ACP, 2007
AAOD = AAOD = K K -AAE-AAE
Absorption Absorption Angstrom Angstrom Exponent (AAE)Exponent (AAE)
AAE =AAE = 1.451.45
2.272.27
2.342.34
1.051.05
1.121.12
For Black For Black Carbon, AAE = 1Carbon, AAE = 1
AOD, 0Z,7/8P3 Actual Mon 7 Jul
Accomplishments:4. Radiant flux divergence stacks for SSA() @ 2 locations5. CAR circles over AERONET for CAR-AERONET retrievals6. 3-way closure (in situ, AATS, AERONET) in spiral
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AOD, 0Z,7/8P3 Actual Mon 7 Jul
Accomplishments:4. Radiant flux divergence stacks for SSA() @ 2 locations5. CAR circles over AERONET for CAR-AERONET retrievals6. 3-way closure (in situ, AATS, AERONET) in spiral
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The first half of the flight encountered a well-mixed local pollution layer up to ~2 km GPS altitude and a long-range transport air mass above, both homogenous over >200 km.
Julia
n D
ay U
TC
220
km
PRELIMINARY DATAfrom AATS & HiGEAR groups
AOD at 550 nm between 500 – 6250 m GPS alt : 0.201
PRELIMINARY DATAfrom HiGEAR group
Clarke, McNaughton, Howell, Freitag et al.
Missing layers at the top and bottom estimated by extrapolation, as illustrated in subsequent slides.
PRELIMINARYData from AATS, AERONET, & HiGEAR groups:
Redemann, Shinozuka, Livingston, Ramachandran et al.McArthur et al.
Clarke, McNaughton, Howell, Freitag et al.
Analysis by Yohei Shinozuka
RH, 0Z,7/8 at 5.5 km
RH, 0Z,7/8 at 1.5 km
RH, 0Z,7/8 at 8.5 km
Siberia biomass burning plume between 1-6 km + weak Asian anthropogenic pollution.
GEOS5 Forecast 20080707_06Z: July 7 P3 Flight
AOD, 0Z,7/8
AOD, 0Z,7/8
AOD, 0Z,7/8
AOD, 0Z,7/8
AOD, 0Z,7/8
P3 For July 7, 2007
Anthro lower
AOD, 0Z,7/8P3 Actual Mon 7 Jul
Accomplishments:4. Radiant flux divergence stacks for SSA() @ 2 locations5. CAR circles over AERONET for CAR-AERONET retrievals6. 3-way closure (in situ, AATS, AERONET) in spiral
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AOD, 0Z,7/8P3 Actual Mon 7 Jul
Accomplishments:4. Radiant flux divergence stacks for SSA() @ 2 locations5. CAR circles over AERONET for CAR-AERONET retrievals6. 3-way closure (in situ, AATS, AERONET) in spiral
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