Dataset on aerosol loading and deposition over Nouakchott-Mauritania

Aerosol optical depth (AOD) is a vital parameter that determines air quality over a geographic enclave. In this paper, the pollution state of Nouakchott-Mauritania was considered. Fifteen years primary (aerosol optical depth) dataset was obtained from the Multi-angle Imaging Spectro-Radiometer (MISR). The secondary datasets were generated from the primary dataset to understand the short and long term effect of aerosol loading over nouakchott. The dataset is important to resolve the ground effect of satellite measurements.


a b s t r a c t
Aerosol optical depth (AOD) is a vital parameter that determines air quality over a geographic enclave. In this paper, the pollution state of Nouakchott-Mauritania was considered. Fifteen years primary (aerosol optical depth) dataset was obtained from the Multi-angle Imaging Spectro-Radiometer (MISR). The secondary datasets were generated from the primary dataset to understand the short and long term effect of aerosol loading over nouakchott. The dataset is important to resolve the ground effect of satellite measurements.

Value of the data
The data gives a good background for further study on aerosol loading. The data provides technician necessary insight towards configurating sun-photometer over Nouakchott-Mauritania.
The data helps to quantify the extent of air pollution.
The data provides modeller necessary insight on aerosol loading and retention challenges over Nouakchott-Mauritania.

Data
One of the known methods for examining the level of pollution over an area is the aerosol optical depth (AOD). Optical properties of aerosol particles have severe influence over the local radiative forcing and radiation balance of the earth [1,2]. The interaction between aerosol and solar radiation can be described by its optical properties. The optical parameters used to describe the aerosol-solar radiation are the extinction and scattering coefficients, the aerosol depth and the single-scattering phase [3][4][5]. From the AOD dataset, aerosol hygroscopic growth factor, total atmospheric optical thickness and aerosols loading [6,7].
The primary data was obtained from Multi-angle Imaging Spectro-Radiometer (MISR) i.e. found in Table 1A-1C. The tunning and atmospheric constants for fifteen was obtained using the West African regional scale dispersion model (WASDM) from the AOD dataset (Figs. 2 and 3). The tunning and atmospheric constants are factors that determines the accuracy of ground instruments e.g. sun photometer [6,7] and they are presented in Table 2. The secondary dataset i.e. aerosol loading was generated using the extended WASDM are presented in Table 3A-C.  Table 2 Atmospheric constants over Nouakchott.

Experimental design, materials and methods
Mauritania is located on latitude 16°N to 22°N and longitude 7°W to 17°W. It is bounded within an approximate total area of 1,030,700 km 2 . Its geographical structure includes arid plains, cliff, plateau and oases. Its climate is hot with irregular rainfall. Nouakchott is located on longitude and latitude of 18.09°and À 15.98° (Fig. 1). a is atmospheric constant gotten from the fifteen years aerosol optical depth (AOD) dataset from MISR, n is the tunning constant, τðλÞ is the AOD of the area and ψ λ À Á is the aerosol loading. The analysis of Eq. (1) was done using the C þ þ codes.
The value of the atmospheric and tuning constant for fifteen years was determine using Eq. (1) over fifteen years data ( Figs. 1 and 2). The summary of the AOD is shown in Table 1. The value atmospheric and tuning constant i.e. obtained from the comprehensive dataset is shown in Table 2 . The secondary dataset i.e. aerosol loading was generated using the extended WASDM are presented in Table 3A-3C. The percentage of the highest aerosol loading is shown in Table 4.