Spatiotemporal distribution patterns of atmospheric methane using GOSAT data in Iran
2020
Mousavi, Seyed Mohsen | Falahatkar, Samereh
Methane (CH₄) is the simplest hydrocarbon in the atmosphere and is the second most important greenhouse gas (GHG) after carbon dioxide (CO₂) whose concentration is changing due to human activities. The main objective of this study is to examine the spatial distribution of CH₄ concentration for Iran in 2013 based on the level 2 GOSAT data using the ordinary kriging technique. For this purpose, first, the relationship between CH₄ concentration and environmental variables such as land surface temperature (LST), normalized difference vegetation index (NDVI), air temperature, and humidity was determined. The results showed that CH₄ concentration changes gradually with latitude and longitude across Iran. The spatial distribution of CH₄ concentration presents the high concentration of this gas in the southern hemisphere and in the east of the study area throughout the year. The correlation of CH₄ concentration with LST and temperature was positive, and its correlation with NDVI and humidity was negative in different seasons of 2013. This implies that with the decline of temperature and LST and rise of humidity and NDVI, CH₄ concentration has decreased in the study area. It is possible to transfer the CH₄ gas from the south to the southeast of Iran according to the location of flaring gas, and wind speed and direction in different seasons. These findings can help decision makers for better management of the sinks and sources of GHGs.
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