Annual mean AOT by MODIS/Terra in 2006
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1
2 Annual mean AOT by MODIS/Terra in 2006 à
3 Lack of measurements in China and India
4 Motivation in/beyond the present study Measurements of aerosol UNEP/ABC-Asia Observatory compounds were limited over Asia, therefore validation of models are inadequate. To combine traditional network (e.g., IMPROVE, EMEP, EANET), own measurements under specific projects, new network like UNEP/ AERONET SKYNET CIMEL sun photometer in ARM project PREDE skyradiometer in Tohoku Univ. ADNET ABC-Asia observatory and column burden of aerosol optical products obtained by AERONET/NASA, SKYNET/Japan, and NIES-Lidar, we start to multi-compare results of the aerosol-transport models and Lidar at NIES (until 2000yr) try to understand their performance. 4
5
6
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8 Start to validation of SPRINTARS especially over Asia
9 à
10 Fig. 1. Mean annual BC emissions for 2008 as used in the AeroCom standard experiment. Fig. 2. BC mass concentration in Hyderabad for the year There are two simulations: SPRINTARS with the AeroCom emissions (solid line with white circles) and with the modified emissions by scaling a factor of 20 around Hyderabad (solid line with black circle) and skyradiometer measurements (dashed line with crosses). ß Simulation(CTL) s used in the AeroCom istribution scheme, n handle scattering, d cloud particles, as nts (Nakajima et al., nal mixtures except ry OC and 50 % BC as externally mixed es are treated as inc. For soil dust and ated for various size 2009). On the other osols, the dry mode pectively (Takemura o the same values as operties by Mie thewhere (Schutgens et imary OC and BC) model simulations AC) project. The ol and BC emis2004). The spaemission invento- Emission inventories of aerosols (primary OC and BC) and its precursors (SO2 ) used in the model simulations Fig. 2. BC mass concentration in Hyderabad for the year are widely used in the AeroCom (AC) project. The There are two simulations: SPRINTARS with the AeroCom emissions (solid line with white circles) and anthropogenic with the modifiedprimary emissionsorganic aerosol and BC emissions are based Bond et al. (2004). The spaby scaling a factor of 20 around Hyderabad (solid line withonblack tial distribution anthropogenic BC emission inventocircle) and skyradiometer measurements (dashed line withof crosses). ries in the AC emission inventory is shown in Fig. 1. The anthropogenic SO2 emissions are based on EDGAR 32FT2000 database ( emission data/edgar 32ft2000/index.html). Biomass burning emissions in each month is based on the fire maps derived from MODIS. The oxidant concentrations such as ozone and hydroxyl radical, which are not predicted in SPRINTARS but are needed to calculate sulfate chemistry, are given by a global chemical transport model, CHASER by Sudo l Surface BC of CTL is quite underestimated, but AOD of CTL during May- August is OK. l Low SSA ( ) seen in observation during June- July could NOT be found at simulation. à Vertical distribution of BC and others (firstly use model with small dx) à Consider BC+Dust internally mixture Multiple comparison is important! Fig. 3. As in Fig. 1, but for AOT except for MODIS/Terra observations (dashed line with black triangles). Goto, Badarinath, et al. (ANGEO, 2011) 960 D. Goto et al.: Simulation of aerosol optical properties over a tropica 960 ß Simulation(CTL) D. Goto etß MODIS/Terra al.: Simulation of aerosol optical properties over a tropica ß Simulation(SEN) ß Observation ß Simulation(CTL) ß Simulation(SEN) ß Observation Fig. 3. As in Fig. 1, but for AOT except for MODIS/Terra observations (dashed line with black triangles). Column AE ß Observation ß Simulation(SEN) et al. (2002), which also was implemented in the MIROC AGCM. In addition to the standard AC emission inventory, Fig. 6. Monthly in AEof from twothe model simulationsinwith we have added variations scaling factor 20 to AC inventory the the AC emissions (solid line with white circles), modified AC emisgrid including the Hyderabad measurement site and genersions (solid line with black circles) and skyradiometer observations ated modified AC emission inventory. This has been carried (dashed line with crosses) for the year out to account for the higher BC concentrations over the measurement site compared to the standard AC emission inventory. Model simulations are carried out with the standard AC emission inventory and the modified AC emission inventory. Fig. 8. Scatter plot of AE vs SSA over Hyderabad in circles indicate simulations both with the AC and the mo sions and crosses indicate observations. The lines are b data points (thick line: black circles, dashed line: cross ß Observation Fig. 8. Scatter plot of AE vs SSA over Hyderabad in Fig. 6. Monthly variations in AE from two model simulations with the AC emissions (solid line with white circles), modified AC emisann. Geophys., 29, , 2011 sions (solid line with black circles) and skyradiometer observations (dashed line with crosses) for the year Column SSA 957 The radiation transfer with a k-distribution scheme, MSTRN-8, in the MIROC AGCM can handle scattering, absorption, and emission by aerosol and cloud particles, as well as absorption by gaseous constituents (Nakajima et al., 2000). The particles are treated as external mixtures except for carbonaceous aerosols. The secondary OC and 50 % BC mass from fossil fuel source are treated as externally mixed particles, but other carbonaceous particles are treated as internal mixtures of BC and primary OC. For soil dust and sea salt aerosols, mixing ratios are calculated for various size bins from 0.1 to 10 µm (Takemura et al., 2009). On the other hand, for carbonaceous and sulfate aerosols, the dry mode radii are set to 0.1 and µm, respectively (Takemura et al., 2002). Aerosol densities are set to the same values as Takemura et al. (2002). The scattering properties by Mie theory used in this study are described elsewhere (Schutgens et al., 2010). Column AOD The surface BC and column ical properties over a tropical urban site circles indicate simulations both with the AC and the mo sions and crosses indicate observations. The lines are b data points (thick line: black circles, dashed line: cross ß Simulation(CTL) ß Simulation(SEN) Monthly average in 2008 Fig. 7. As in Fig. 6, but for SSA. 10 Fig. 9. As in Fig. 8, but for a scatter plot of BC vs. SSA
11 Mass concentration [µg/m 3 ] BC Day [July 2007 June 2008] AOT AOT Day [July 2007 June 2008] Mass concentration [µg/m 3 ] Sulfate Day [July 2007 June 2008] SSA SSA Day [July 2007 June 2008]
12 Multi- comparison using SPRINTARS modules and measurements during April 2006 Available sites in the present study over Asia during April 2006 Comparison in monthly mean AOD550 Comparison in monthly mean AOD550 AOT Beijing MIROC-T106 MIROC- T106 MIROC-T106 Toyama Fukue CapeHedo Only sulfate (EANET) Sulfate and BC (Zhang et al., 2012) MIROC+Goto11 MIROC+Goto11 MIROC- G11 MIROC- CTL MIROCMIROC Intensive sites in the present study Sulfate mass NICAMNICAM NICAM- CTL MODISMODIS Beijing Beijing Fukue Fukue CapeHedo CapeHedo Toyama Toyama Observation Observation AOT Observation represents and Cape Hedo, Toyama by Dr. Aoki Goto, Dai, et al. (in prep., 2013a) by collaborating with ABC-Asia project 12 2
13 Resolving heterogeneity of aerosol around megacity: SPRINTARS with dx=10km using stretch-nicam Black carbon (BC) in unit of µg/m3 Global NICAM Stretch grid system (Tomita, 2008a) Sulfate in unit of µg/m3 Low computational cost Use the common code Easily change the center Goto & MEXT/RECCA/SALSA project team (in prep., 2013b) 13
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