MAX-DOAS air quality observations at Phimai,
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1 MAX-DOAS air quality observations at Phimai, Thailand, conducted in the framework of SKYNET Hitoshi Irie Center for Environmental Remote Sensing (CEReS) Chiba University, Japan 1 T. Takamura, 1 P. Khatri, 2 T. Nakajima 1 Chiba University, 2 University of Tokyo
2 SKYNET An observation network dedicated for aerosolcloud-radiation interaction researches. (e.g., Takamura et al., 2004; Nakajima et al., 2007) Initiated under the WCRP/GAME project and expanded focusing on East Asia as ADEOS/GLI validation activity. A growing network linking more than 100 sites (as of 2015) all over the world. Still expanding with one main focus on satellite validations (GCOM-C, EarthCARE, GOSAT, GOSAT-2, Himawari-8, GEMS,...). Sky radiometer (AOD, SSA, COD, O 3, H 2 O,...) MAX-DOAS (AOD, NO 2, SO 2, H 2 O, O 3, HCHO,...) In recent years, we are trying to enhance more the capability of SKYNET by adding the viewpoint of atmosphereic chemistry.
3 Air quality research under SKYNET The idea to enhance the capability of SKYNET SKYNET International network Atmospheric chemistry Atmospheric physics aerosols trace gases (inorganic/organic) clouds radiation 3
4 Phimai site as part of growing network SKYNET 4
5 SKYNET/Phimai site Phimai site: 15.18ºN, ºE, 212 m a.s.l. In Bureau of Royal Rainmaking and Agricultural Aviation (BRRAA), Phimai, Thailand. Observations have been performed under close collaboration with Chulalongkorn University. Sky radiometer Lidar Pyranometer Direct solar rad. obs. Pyrgeometer Microwave radiometer Cloud camera Met obs. MAX-DOAS Satellite-retrieved HCHO VCD (10 15 molec. cm -2 ) (De Smedt et al., 2010) We introduced the MAX-DOAS system at Phimai on September 18,
6 Principle of MAX-DOAS observations (Multi-AXis Differential Optical Absorption Spectroscopy) High sensitivity to trace gases in the boundary layer Long-term operation Easy to handle Inexpensive Low power consumption UV/Vis. spectrum ~10-20 km 6
7 MAX-DOAS instrument Outdoor unit (telescope, etc.) Indoor unit(spectrometer, etc.) movable mirror 10-m fiber optic cable Field of view < 1 deg Elevation angles = 2, 3, 4, 6, 8, 70 deg Maya2000Pro (Ocean Optics) FWHM: about 0.3 nm Wavelength: nm Temperature kept at 40 Integ. time constant throughout the day
8 Retrieval algorithm development DOAS method: raw spectra slant column density (extraction of conc. info. ) Radiative transfer model: ray trace simulation for various conditions validated under an international framework [Wagner et al., 2007] Inversion #1: Retrieving a vertical profile of aerosols Inversion #2: Retrieving a vertical profile of NO 2 Aerosols NO 2 8
9 Explored the potential for multi-component observations (Irie et al., 2011, 2015) Aerosols Aerosols Inorganic Organic Organic Inorganic Inorganic Inorganic Lower-tropospheric vertical profile information for 8 quantities: Aerosols at 357 & 476 nm NO 2, SO 2, O 3, H 2 O HCHO, CHOCHO 9
10 Results: Diurnal variations (the first 3 days) Rapid diurnal variation in NO 2 and SO 2 VMRs. can models reproduce these features as well as VMR levels? HCHO VMR is much larger than NO 2 VMR. significant biogenic contributions
11 Seasonal variations(oct.2014 Feb.2015) Aerosols NO 2 O 3 SO 2 From the late wet season through the dry season, aerosols and NO 2, SO 2, and O 3 VMRs were enhanced.
12 Seasonal variations for VOCs HCHO CHOCHO We hope that RSKYNET GF = [CHOCHO]/[HCHO] will contribute to various ACAM activities through our unique observations. Jan. 31-Feb. 9, 2008 Dry season MODIS fire maps (Tsuruta et al., 2008) HCHO and CHOCHO VMRs were also enhanced. R GF was at a moderate level of mixed contributions from BVOC and BB emissions
13 Summary SKYNET is expanding, with one of main focuses on satellite validations (GCOM-C, EarthCARE, GOSAT-2, GEMS,...). As an option for AQ study, we introduced the MAX-DOAS system at SKYNET/Phimai site in September We found that from the late wet season through the dry season, aerosols, NO 2, SO 2, O 3, HCHO, and CHOCHO VMRs were all enhanced. R GF, defined as [CHOCHO]/[HCHO], was at a moderate level of 0.03, suggesting mixed contributions from BVOC and BB emissions in the dry season. Including this unique observation at Phimai, SKYNET will provide very useful data for various ACAM activities, such as the evaluation of climate models. 13
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