Study of Aerosol/Cloud/Radiation Interactions over the ARM SGP Site Page: 4 of 9
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CAM3 SGP(36.6N,97.5W) GEOS3 2001 SGP(36.6N,97.5W) 2001 SGP ARMIMPACT(Derived)
0 Total 0 Total . IMPACT: RH =% 0 ARM
40 3 0 4 04 80%
4 0- . 40 BC 0.6 9 %
E Dust E Dust E95%
30 . sst 30 " sst
L 0.4 -
020 . 20 0
10 . - 10 . .0.2
J F M A M J J A S 0 N D J F M A M J J A S 0 N D J F M A M J J A S 0 N D
Figure 2. Simulated seasonal variations of column burden of aerosols over the SGP site using CAM3
(left) and GEOS3 2001 (middle) meteorology. Also shown on the right are the ARM data and the
"derived" AOD as a function of relative humidity from the aerosol burden simulated with GEOS3 2001.
The simulated aerosol concentrations and components over the SGP site are incorporated
into the 2D version of LLNL non-hydrostatic, fully compressible cloud resolving model (CRM)
to study the impacts of aerosols on the optical and microphysical characteristics of clouds. In this
study, the cloud model simulates a squall-like precipitation system passing through the central
facility of ARM SGP site on June 19, 2004 (Figures 3a-3d). Model framework is set up with
varied horizontal (2 km in the central 900-km area with 50 stretching grids on both sides) and
vertical resolution (50 m near the ground and gradually increased to 600 m at 3.3 km) with top
layer at 20.7 km. The initial condition at 1400 UTC (i.e., 9 AM) is modified from the 1130 UTC
sounding at the central facility as shown in Figure 3e. Though the convective available potential
energy (CAPE), 620 mss 2, is small in this case, the treatment of prognostic surface energy is
able to destabilize and moisten the environment near the ground and leads to the development of
a squall-like precipitation system with substantial wind shear in the lowest 3 km. The vertical
profiles of natural (SO4b, OCn, submicron dust, and sea salt) and anthropogenic (SO4a, OC, and
BC) aerosols applied into CRM are those monthly averages for June and are shown in Figure 4a,
while the interrelationship between anthropogenic sulfate, aerosol number, updraft velocity, and
liquid cloud nucleation described by Chuang et al. (2002a) is given in Figure 4b.
(a) 200UTC(b) 1400 UJTC
(e) Sounding: 1400 UTC, June 19 2004, SGPC1
_(c) 1600 UTC (d) 1800 UTC
M m ' CAPF: 620 2/s2
Figure 3. (a) - (d) Radar reflectivity of the selected precipitation system passing through the central
facility of ARM SGP site on June 19, 2004. (e) Initial sounding. The horizontal velocity shown on the
right is the normal-line component of winds, parallel to the propagation of rain band.2
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Chuang, C. & Chin, S. Study of Aerosol/Cloud/Radiation Interactions over the ARM SGP Site, article, March 14, 2006; Livermore, California. (https://digital.library.unt.edu/ark:/67531/metadc891246/m1/4/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.