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Wang J.,Fuyang University | Zhao Q.,CAS Anhui Institute of Optics and Fine Mechanics | Cui S.,CAS Anhui Institute of Optics and Fine Mechanics | Zhu C.,CAS Anhui Institute of Optics and Fine Mechanics
Journal of the Atmospheric Sciences | Year: 2012

Coastal and island Aerosol Robotic Network (AERONET) sites are used to determine characteristic aerosol modes over marine environments. They are compared with the assumed modes used in the operational Moderate Resolution Imaging Spectroradiometer (MODIS) ocean aerosol algorithm, and the results show that 1) the standard deviation values of three fine aerosol modes (0.6) and one dustlike aerosol mode(0.8) are much higher than the corresponding statisticalAERONET modal values (0.45 and 0.6, respectively). The values of three sea salt aerosol modes (0.6) are somewhat lower than the corresponding statistical AERONET modal value (0.675). 2) The number median radius of the current fine and dustlike aerosol modes cannot span the dynamic range of corresponding aerosol distribution properly. 3) AERONET products show that the standard deviation and the number median radius exhibit an obvious negative correlation, especially for sea salt and dustlike aerosol modes. According to this, a refinement of the current aerosol modes is made. These revised modes are used in a version of the MODIS retrieval over ocean. Compared with the current aerosol modes: 1) more retrieved aerosol optical depths (AODs) from the revised aerosol modes lie within the expected error bars and 2) the linear regression lines of the retrievals from the revised aerosol modes and AERONET are closer to the 1:1line. ©2012 American Meteorological Society.

Wang J.,Fuyang University | Wang J.,Chinese Academy of Sciences | Wang J.,CAS Anhui Institute of Optics and Fine Mechanics
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2011

It is important to retrieve aerosol optical properties over coastal region not only for study of oceanic productivity but also for study of climate because coastal region is highly influenced by neighboring aerosol source regions. The present operational Moderate Resolution Imaging Spectroradiometer (MODIS) aerosol retrieval algorithm works reasonably well over clear ocean areas but fails to give any results over brighter coastal waters. This is because: the turbid waters are not dark for the two aerosol retrieval channels centered near 0.553μm, 0.646μm. We have developed an aerosol retrieval algorithm for remote sensing of aerosol properties over turbid coastal water. In this algorithm, channels centered near 0.86,1.24,1.64 and 2.13μm are used. If necessary, the reflectance of 0.86μm will be corrected. The proposed algorithm is applicable for MODIS data observed over turbid coastal water in the southeast of China. The retrieval results agree quite well with the measurements obtained with sun photometers, and it can be easily used in the present operational aerosol retrieval algorithm. As a result, many valuable aerosol data can be obtained. © 2011 SPIE.

Cui S.,CAS Anhui Institute of Optics and Fine Mechanics | Cui S.,Chinese Academy of Sciences | Yang S.,CAS Anhui Institute of Optics and Fine Mechanics | Yang S.,Chinese Academy of Sciences | And 9 more authors.
Optik | Year: 2012

A regularized inversion method is presented to invert the bidirectional reflectance distribution function (BRDF) model for albedo calculations. It is known as discrete ill-posed inverse problem. Essential issues that must be considered include solution existence, solution uniqueness, instability of the solution process, and geophysical meanings of solution. In order to robustly estimate BRDF models parameters, a spectrum cutoff technique is employed to suppress spurious oscillations due to poor angular distribution, sparse sample size, or both. We studied difficulties in estimating BRDF parameters and analyzed the cause of the instability in the solution, and then presented a novel algorithm. The proposed RSC (Regularized Spectrum Cutoff) method is based on improving the spectrum of the BRDF kernel matrix and can always find suitable BRDF parameters for sparse satellite observations. The algorithm is compared with the MODIS (Moderate Resolution Imaging Spectroradiometer) full retrieval (FR) algorithm, and it is tested to be suitable for the case of sufficient observations. Numerical experiments with POLDER (Polarization and Directionality of the Earth's Reflectances) BRDF datasets and MODIS images suggest that the developed spectrum cutoff method is adaptive and robust, and it is valuable for retrieving land surface BRDF and albedo. © 2011 Elsevier GmbH. All rights reserved.

Qiao R.,Fuyang University | Chen S.-S.,Fuyang University | Chen S.-S.,Nanjing University | Sheng L.-Q.,Fuyang University | And 2 more authors.
Journal of Solid State Chemistry | Year: 2015

Four metal-organic coordination polymers [Zn(HL)(H2O)]·4H2O (1), [Zn(HL)(L1)]·4H2O (2), [Cu(HL)(H2O)]·3H2O (3) and [Cu(HL)(L1)]·5H2O (4) were synthesized by reactions of the corresponding metal(II) salts with semirigid polycarboxylate ligand (5-((4-carboxypiperidin-1-yl)methyl)isophthalic acid hydrochloride, H3L·HCl) or auxiliary ligand (1,4-di(1H-imidazol-4-yl)benzene, L1). The structures of the compounds were characterized by elemental analysis, FT-IR spectroscopy and single-crystal X-ray diffraction. The use of auxiliary ligand L1 has great influence on the structures of two pairs of complexes 1, 2 and 3, 4. Complex 1 is a uninodal 3-connected rare 2-fold interpenetrating ZnSc net with a Point (Schlafli) symbol of (103) while 2 is a one-dimensional (1D) ladder structure. Compound 3 features a two-dimensional (2D) honeycomb network with typical 63-hcb topology, while 4 is 2D network with (4, 4) sql topology based on binuclear CuII subunits. The non-covalent bonding interactions such as hydrogen bonds, π···π stacking and C-H···π exist in complexes 1-4, which contributes to stabilize crystal structure and extend the low-dimensional entities into high-dimensional frameworks. And the photoluminescent property of 1 and 2 and gas sorption property of 4 have been investigated. © 2015 Elsevier Inc. All rights reserved.

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