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Discussion papers | Copyright
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 03 Sep 2018

Research article | 03 Sep 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Natural Hazards and Earth System Sciences (NHESS).

Analysis of Land surface Temperature change based on MODIS data, Case study: Inner Delta of Niger

Abdramane Dembélé1,3, Xiufen Ye1, and Amadou Touré2 Abdramane Dembélé et al.
  • 1Automation, Harbin Engineering University, Harbin 150001, Heilongjiang, China
  • 2Forestry, Northeast Forestry University, Harbin, 150040, Xiangfang District, China
  • 3Geodesy, National School of Engineers ENI (Ecole Nationale d'Ingenieurs – Mali), 410, Av Vollenhoven, 242, Bamako, Mali

Abstract. Land Surface Temperature (LST) investigation in the Sahel zones is a crucial task to counter the climate change effects. Inner Delta of Niger (IDN) affected by a significant change of LST over an eighteen years period (from 2000 to 2017) is threatened by natural risks like volcanic hazards and the degradation of the global environment. This work focuses on the Early Warning Systems and Monitoring Technologies of the LST change over the existent phenomena and different types of geologies. Indeed, the processing of MODIS (Moderate-Resolution Imaging Spectroradiometer) data was carried out from Geographic Information System (GIS) and remote sensing (RS) methods including equal interval method followed by the highlighting of hottest sectors as well as their delineations. The diachronic analysis of processed images into 5 temperature slices at equal interval, shows a temperature increase over the said period with an annual rate of increasing temperatures of 0.24°C. The spatiotemporal dynamics of temperature slices 19.21°C to 25.15°C, 25.15°C to 31.10°C and 31.10°C to 37.05°C shows an extension of surfaces with mean annual progress rates of 0.13%, 0.20%, and 1.74% respectively. At the same time, mean annual regress rates of −0.64%, and −1.42% has been observed at the temperature slices 37.05°C to 43.00°C and 43.00°C to 48.94°C. The attrition (disappearance of spots) of 12.22% represents the dominant spatial transformation process of the maximum temperature slice 43.00°C to 48.94°C which spreads over a mean surface of 4.42%. Thus the maximal temperature increases while its occupancy surface decreases. Therefore, The IDN threatened by the desertification is affected by a strong terrestrial global warming determining the volcanic hazards areas (Faguibine Lake).

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Abdramane Dembélé et al.
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Short summary
This work evaluates the effects of the terrestrial warming in the Inner Delta of Niger (Mali) by the analysis of the Land Surface Temperature (LST) transition and the Spatial Transformation process (STP). Results show an important increase of the temperature while determining an extension of moderately warm areas at the same time a decrease of the warmest areas until to determine volcanic hazards areas (Faguibine Lake). Thus, this work provides a useful contribution to the terrestrial warming.
This work evaluates the effects of the terrestrial warming in the Inner Delta of Niger (Mali) by...