Improving the Accuracy of Daily PM2.5 Distributions Derived from the Fusion of Ground-Level Measurements with Aerosol Optical Depth Observations, a Case Study in North China

2016 ◽  
Vol 50 (9) ◽  
pp. 4752-4759 ◽  
Author(s):  
Baolei Lv ◽  
Yongtao Hu ◽  
Howard H. Chang ◽  
Armistead G. Russell ◽  
Yuqi Bai
Keyword(s):  
Aerosol Optical Depth ◽  
Optical Depth ◽  
North China ◽  
Ground Level

scholarly journals Estimating ground-level PM<sub>2.5</sub> in Eastern China using aerosol optical depth determined from the GOCI Satellite Instrument

2015 ◽  
Vol 15 (12) ◽  
pp. 17251-17281 ◽  
Author(s):  
J. Xu ◽  
R. V. Martin ◽  
A. van Donkelaar ◽  
J. Kim ◽  
M. Choi ◽  
...  
Keyword(s):  
Organic Matter ◽  
Aerosol Optical Depth ◽  
Optical Depth ◽  
Transport Model ◽  
Eastern China ◽  
Ground Level ◽  
East China ◽  
Chemical Transport Model ◽  
Near Surface ◽  
Significant Agreement

Abstract. We determine and interpret fine particulate matter (PM2.5) concentrations in East China for January to December 2013 at a horizontal resolution of 6 km from aerosol optical depth (AOD) retrieved from the Korean Geostationary Ocean Color Imager (GOCI) satellite instrument. We implement a set of filters to minimize cloud contamination in GOCI AOD. Evaluation of filtered GOCI AOD with AOD from the Aerosol Robotic Network (AERONET) indicates significant agreement with mean fractional bias (MFB) in Beijing of 6.7 % and northern Taiwan of −1.2 %. We use a global chemical transport model (GEOS-Chem) to relate the total column AOD to the near-surface PM2.5. The simulated PM2.5/AOD ratio exhibits high consistency with ground-based measurements (MFB = −0.52–8.0 %). We evaluate the satellite-derived PM2.5 vs. the ground-level PM2.5 in 2013 measured by the China Environmental Monitoring Center. Significant agreement is found between GOCI-derived PM2.5 and in-situ observations in both annual averages (r = 0.81, N = 494) and monthly averages (MFB = 13.1 %), indicating GOCI provides valuable data for air quality studies in Northeast Asia. The GEOS-Chem simulated chemical speciation of GOCI-derived PM2.5 reveals that secondary inorganics (SO42−, NO3−, NH4+) and organic matter are the most significant components. Biofuel emissions in northern China for heating are responsible for an increase in the concentration of organic matter in winter. The population-weighted GOCI-derived PM2.5 over East China for 2013 is 53.8 μg m−3, threatening the health and life expectancy of its 600 million residents.

scholarly journals Daytime variation of aerosol optical depth in North China and its impact on aerosol direct radiative effects

2018 ◽  
Vol 182 ◽  
pp. 31-40 ◽  
Author(s):  
Jingjing Song ◽  
Xiangao Xia ◽  
Huizheng Che ◽  
Jun Wang ◽  
Xiaoling Zhang ◽  
...  
Keyword(s):  
Aerosol Optical Depth ◽  
Optical Depth ◽  
North China ◽  
Radiative Effects ◽  
Daytime Variation

Retrieval of Aerosol Optical Depth Over North China From Polarized Satellite Observations Using Re‐derived Surface Properties

2019 ◽  
Vol 6 (12) ◽  
pp. 2241-2250
Author(s):  
Han Wang ◽  
Meiru Zhao ◽  
Leiku Yang ◽  
Pei Liu ◽  
Weibing Du ◽  
...  
Keyword(s):  
Surface Properties ◽  
Aerosol Optical Depth ◽  
Optical Depth ◽  
North China ◽  
Satellite Observations

scholarly journals Evaluation of Aerosol Optical Depth and Aerosol Models from VIIRS Retrieval Algorithms over North China Plain

2017 ◽  
Vol 9 (5) ◽  
pp. 432 ◽  
Author(s):  
Jun Zhu ◽  
Xiangao Xia ◽  
Jun Wang ◽  
Huizheng Che ◽  
Hongbin Chen ◽  
...  
Keyword(s):  
Aerosol Optical Depth ◽  
Optical Depth ◽  
North China Plain ◽  
North China ◽  
Retrieval Algorithms

A nonlinear model for estimating ground-level PM10 concentration in Xi'an using MODIS aerosol optical depth retrieval

2016 ◽  
Vol 168 ◽  
pp. 169-179 ◽  
Author(s):  
Wei You ◽  
Zengliang Zang ◽  
Lifeng Zhang ◽  
Mei Zhang ◽  
Xiaobin Pan ◽  
...  
Keyword(s):  
Aerosol Optical Depth ◽  
Optical Depth ◽  
Nonlinear Model ◽  
Ground Level ◽  
Pm10 Concentration

scholarly journals Spatiotemporal Associations between GOES Aerosol Optical Depth Retrievals and Ground-Level PM2.5

2008 ◽  
Vol 42 (15) ◽  
pp. 5800-5806 ◽  
Author(s):  
Christopher J. Paciorek ◽  
Yang Liu ◽  
Hortensia Moreno-Macias ◽  
Shobha Kondragunta
Keyword(s):  
Aerosol Optical Depth ◽  
Optical Depth ◽  
Ground Level

scholarly journals Evidence of a possible turning point in solar UV-B over Canada, Europe and Japan

2012 ◽  
Vol 12 (5) ◽  
pp. 2469-2477 ◽  
Author(s):  
C. S. Zerefos ◽  
K. Tourpali ◽  
K. Eleftheratos ◽  
S. Kazadzis ◽  
C. Meleti ◽  
...  
Keyword(s):  
Aerosol Optical Depth ◽  
Optical Depth ◽  
Total Ozone ◽  
Turning Point ◽  
Amplification Factor ◽  
Ground Level ◽  
Cloud Fraction ◽  
Spectral Irradiance ◽  
Solar Uv

Abstract. This study examines the long-term variability of UV solar irradiances at 305 nm and 325 nm over selected sites in Canada, Europe and Japan. Site selection was restricted to the availability of the most complete UV spectroradiometric datasets during the period 1990–2011. The analysis includes the long-term variability of total ozone, aerosol optical depth and cloud fraction at the sites studied. The results, based on observations and modeling, suggest that over Canada, Europe and Japan the period under study can be divided into three sub-periods of scientific merit: the first period (1991–1994) is the period perturbed by the Pinatubo volcanic eruption, during which excess volcanic aerosol has enhanced the "conventional" amplification factor of UV-B at ground level by an additional factor that depends on solar elevation. The increase of the UV-B amplification factor is the result of enhanced scattering processes caused by the injection of huge amounts of volcanic aerosols during the perturbed period. The second period (1995–2006) is characterized by a 0.14% yr−1 increase in total ozone and an increasing trend in spectral irradiance by 0.94% yr−1 at 305 nm and 0.88% yr−1 at 325 nm. That paradox was caused by the significant decline of the aerosol optical depth by more than 1% yr−1 (the "brightening" effect) and the absence of any statistically significant trend in the cloud fraction. The third period (2007–2011) shows statistically significant evidence of a slowdown or even a turning point in the previously reported upward UV-B trends over Canada, Europe and Japan.

scholarly journals Retrieval of aerosol optical depth in vicinity of broken clouds from reflectance ratios: case study

2010 ◽  
Vol 3 (5) ◽  
pp. 1333-1349 ◽  
Author(s):  
E. Kassianov ◽  
M. Ovchinnikov ◽  
L. K. Berg ◽  
S. A. McFarlane ◽  
C. Flynn ◽  
...  
Keyword(s):  
Aerosol Optical Depth ◽  
Optical Depth ◽  
Great Plains ◽  
Land Surface ◽  
Single Layer ◽  
Department Of Energy ◽  
High Spectral Resolution ◽  
Data Sets ◽  
Atmospheric Radiation Measurement

Abstract. A recently developed reflectance ratio (RR) method for the retrieval of aerosol optical depth (AOD) is evaluated using extensive airborne and ground-based data sets collected during the Cloud and Land Surface Interaction Campaign (CLASIC) and the Cumulus Humilis Aerosol Processing Study (CHAPS), which took place in June 2007 over the US Department of Energy (DOE) Atmospheric Radiation Measurement (ARM) Southern Great Plains site. A detailed case study is performed for a field of single-layer shallow cumuli observed on 12 June 2007. The RR method is applied to retrieve the spectral values of AOD from the reflectance ratios measured by the MODIS Airborne Simulator (MAS) for two pairs of wavelengths (660 and 470 nm, 870 and 470 nm) collected at a spatial resolution of 0.05 km. The retrieval is compared with an independent AOD estimate from three ground-based Multi-filter Rotating Shadowband Radiometers (MFRSRs). The interpolation algorithm that is used to project MFRSR point measurements onto the aircraft flight tracks is tested using AOD derived from NASA Langley High Spectral Resolution Lidar (HSRL). The RR AOD estimates are in a good agreement (within 5%) with the MFRSR-derived AOD values for the 660-nm wavelength. The AODs obtained from MAS reflectance ratios overestimate those derived from MFRSR measurements by 15–30% for the 470-nm wavelength and underestimate the 870-nm AOD by the same amount.

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