Spatial and seasonal variations in atmospheric aerosols over Nigeria: Assessment of influence of intertropical discontinuity movement

Ayanlade, Ayansina; Atai, Godwin; Jegede, Margaret O.

doi:10.1177/1759313118820306

Cited by 7 publications

(4 citation statements)

References 77 publications

(92 reference statements)

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“…The long-range transport of dust aerosols from the Middle East and North Africa probably also increases aerosol loadings over Turkey in the summer [61,62]. For example, the same results have been found for AOD over Saudi Arabia [48], India, and Nigeria [63,64]. Equation (2) shows that the R 2 obtained in the comparison between MODIS/MERRA-2 and AERONET AOD is correlated to atmospheric RH.…”

Section: Discussionsupporting

confidence: 53%

Validation of MODIS C6.1 and MERRA-2 AOD Using AERONET Observations: A Comparative Study over Turkey

2020

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This study validated MODIS (Moderate Resolution Imaging Spectroradiometer) of the National Aeronautics and Space Agency, USA, Aqua and Terra Collection 6.1, and MERRA-2 (Modern-ERA Retrospective Analysis for Research and Application) Version 2 of aerosol optical depth (AOD) at 550 nm against AERONET (Aerosol Robotic Network) ground-based sunphotometer observations over Turkey. AERONET AOD data were collected from three sites during the period between 2013 and 2017. Regression analysis showed that overall, seasonally and daily statistics of MODIS are better than MERRA-2 by the mean of coefficient of determination (R2), mean absolute error (MAE), and relative root mean square deviation (RMSDrel). MODIS combined Terra/Aqua AOD and MERRA-2 AOD corresponding to morning and noon hours resulted in better results than individual sub datasets. A clear annual cycle in AOD was detected by the three platforms. However, overall, MODIS and MERRA-2 tend to overestimate and underestimate AOD, respectively, in comparison with AERONET. MODIS showed higher efficiency in detecting extreme events than MERRA-2. There was no clear relation found between the accuracy in MODIS/MERRA-2 AOD and surface relative humidity (RH).

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Section: Discussionsupporting

confidence: 53%

Validation of MODIS C6.1 and MERRA-2 AOD Using AERONET Observations: A Comparative Study over Turkey

2020

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“…The Freshwater ecological zones share a similar occurrence of AOD with the Rainforest ecological zone. The monthly and seasonal distribution of atmospheric aerosols varied over the different ecological zones 59 . It is obvious that the distributions of atmospheric aerosols reflect the climate seasonality.…”

Section: Resultsmentioning

confidence: 99%

Early warning climate indices for malaria and meningitis in tropical ecological zones

Ayanlade

Nwayor

Sergi

et al. 2020

Sci Rep

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this study aims at assessing the impacts of climate indices on the spatiotemporal distribution of malaria and meningitis in nigeria. the primary focus of the research is to develop an early Warning System (eWS) for assessing climate variability implications on malaria and meningitis spread in the study area. Both climate and health data were used in the study to determine the relationship between climate variability and the occurrence of malaria and meningitis. the assessment was based on variations in different ecological zones in Nigeria. Two specific sample locations were randomly selected in each ecological zone for the analysis. the climatic data used in this study are dekadal precipitation, minimum and maximum temperature between 2000 and 2018, monthly aerosol optical depth between 2000 and 2018. The results show that temperature is relatively high throughout the year because the country is located in a tropical region. The significant findings of this study are that rainfall has much influence on the occurrence of malaria, while temperature and aerosol have more impact on meningitis. We found the degree of relationship between precipitation and malaria, there is a correlation coefficient R 2 ≥ 70.0 in Rainforest, Freshwater, and Mangrove ecological zones. the relationship between temperature and meningitis is accompanied by R 2 ≥ 72.0 in both Sahel and Sudan, while aerosol and meningitis harbour R 2 = 77.33 in the Sahel. The assessment of this initial data seems to support the finding that the occurrences of meningitis are higher in the northern region, especially the Sahel and Sudan. in contrast, malaria occurrence is higher in the southern part of the study area. in all, the multiple linear regression results revealed that rainfall was directly associated with malaria with β = 0.64, p = 0.001 but aerosol was directly associated with meningitis with β = 0.59, p < 0.001. The study concludes that variability in climatic elements such as low precipitation, high temperature, and aerosol may be the major drivers of meningitis occurrence. Climatic variability and seasonality play a significant role in the spatiotemporal distribution of diseases. It has been reported that about 700,000 to 2.7 million people die of malaria each year, the majority of them, nearly 75% of those, are African children 1. Several studies have shown that the occurrence and spatial distribution of malaria are sensitive to the seasonality of climatic factors in Iran, most African countries, and other parts of the world with significant perinatal morbidity and mortality 2-6. Disease vectors depend on suitable habitats to breed, which in turn depends heavily on climatic conditions and for understanding the nature of some illness 7. The malaria and meningitis (MM) transmission is highly seasonal due to climatic conditions; these occurrences are much more frequent in recent times due to climate change 8-14. Climate and health are indistinctly interconnected, and this is the same for infectious diseases 15,16. Climate change is likely to incre...

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“…In the study area, the daily temperature is sometimes above 35-38 C depending on the location; the monthly mean value falls to around 27 C. The intertropical convergence zone includes the warm, tropical-maritime air mass that originates from the Atlantic Ocean over the southern part of Nigeria and the dry, dusty, tropicalcontinental air mass which originates from the Sahara desert over northern Nigeria. The Sahara desert is a significant indicator of climatic variability in Nigeria: temperature increases around March-April moving northward, after a low period in January, while the intertropical convergence zone (rainfall) causes a low temperature in the north in August when the sun migrates southward (Ayanlade et al, 2019). Climate datasets of the Moderate Radiometer Imaging Spectroradiometer and Tropical Rainfall Measuring Mission (TRMM) for these ecological zones were assessed from the National Oceanic and Atmospheric Administration (NOAA).…”

Section: Methodsmentioning

confidence: 99%

Malaria and meningitis under climate change: initial assessment of climate information service in Nigeria

Ayanlade

Sergi

Ayanlade

2020

Meteorological Applications

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It is often difficult to define the relationship and the influence of climate on the occurrence and distribution of disease. To examine this issue, the effects of climate indices on the distributions of malaria and meningitis in Nigeria were assessed over space and time. The main purpose of the study was to evaluate the relationships between climatic variables and the prevalence of malaria and meningitis, and develop an early warning system for predicting the prevalence of malaria and meningitis as the climate varies. An early warning system was developed to predetermine the months in a year that people are vulnerable to malaria and meningitis. The results revealed a significant positive relationship between rainfall and malaria, especially during the wet season with correlation coefficient R 2 ≥ 60.0 in almost all the ecological zones. In the Sahel, Sudan and Guinea, there appears to be a strong relationship between temperature and meningitis with R 2 > 60.0. In all, the results further reveal that temperatures and aerosols have a strong relationship with meningitis. The assessment of these initial data seems to support the finding that the occurrence of meningitis is higher in the northern region, especially the Sahel and Sudan. In contrast, malaria occurrence is higher in the southern part of the study area. We suggest that a thorough investigation of climate parameters is critical for the reallocation of clinical resources and infrastructures in economically underprivileged regions.

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Spatial and seasonal variations in atmospheric aerosols over Nigeria: Assessment of influence of intertropical discontinuity movement

Cited by 7 publications

References 77 publications

Validation of MODIS C6.1 and MERRA-2 AOD Using AERONET Observations: A Comparative Study over Turkey

Validation of MODIS C6.1 and MERRA-2 AOD Using AERONET Observations: A Comparative Study over Turkey

Early warning climate indices for malaria and meningitis in tropical ecological zones

Malaria and meningitis under climate change: initial assessment of climate information service in Nigeria

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