التفاصيل البيبلوغرافية
| العنوان: |
MODEL PREDICTION AND CLIMATOLOGY OF AEROSOL OPTICAL DEPTH (t550) AND ANGSTROM EXPONENT (α470-660) OVER THREE AEROSOL ROBOTIC NETWORK STATIONS IN SUB-SAHARAN AFRICA USING MODERATE RESOLUTION IMAGING SPECTRORADIOMETER DATA. |
| المؤلفون: |
Sharafa, S. B., Aliyu, R., Ibrahim, B. B., Tijjani, B. I., Darma, T. H., Gana, U. M., Ayedun, F., Sulu, H. T. |
| المصدر: |
Nigerian Journal of Technology; Jan2020, Vol. 39 Issue 1, p255-268, 14p |
| مصطلحات موضوعية: |
OPTICAL depth (Astrophysics), SPECTRORADIOMETER, AEROSOLS, OPTICAL imaging sensors, CLIMATOLOGY, PREDICTION models, EXPONENTS |
| مصطلحات جغرافية: |
SUB-Saharan Africa |
| الشركة/الكيان: |
INTERNATIONAL Labour Organisation |
| مستخلص: |
The spatial and temporal variations of aerosol optical depth at 550 nm (α550) and Angstrom exponent derived from 470 and 660 nm (α470-660) over Nairobi (NAI), Skukuza (SKU) and Ilorin (ILO) Aerosol Robotic Network (AERONET) stations in sub-Saharan Africa, as recorded by Moderate Resolution Imaging Spectroradiometer (MODIS) satellites for fifteen years (2000-2015), were examined in relation to their climatologies and prediction. The MODIS measurements of α550 and α470-660 from aqua (MYD04) and terra (MOD04) satellites were used in this study. Retrievals of α550 for both satellites were validated with AERONET α550 for the same period. The validation results showed that they compare favourably over the three stations, but MOD04 performed better than MYD04 data in NAI and ILO for α550. This shows that the α550 of NAI and ILO are best captured using the MOD04 data while that of SKU is best with MYD04. It was also discovered that MODIS underestimated AERONET α550 data over NAI and SKU. The most polluted station is ILO while the least polluted one is NAI. Similarly, the station with the highest concentration of absorbing aerosols is NAI and the least was observed in ILO. The aerosol climatology shows that the most polluted months in NAI, SKU and ILO are October, June and March respectively. On the other hand, February, November and March has the highest amount of scattering aerosols in the atmosphere for NAI, SKU and ILO respectively. The highest amount of absorbing aerosols was found, respectively, in the months of June, June and August. The generated time series (TS) models are all good, though a general underestimation of the parameters by the models was also observed. [ABSTRACT FROM AUTHOR] |
|
Copyright of Nigerian Journal of Technology is the property of University of Nigeria, Faculty of Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| قاعدة البيانات: |
Complementary Index |
Full Text Finder