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Monitoring Tropospheric Methane Concentrations using TROPOMI Sentinel 5P Satellite; A Case Study of Ghana, West Africa¡§Nadine Osei-Essah¡Ê Graduate School of Environmental Science, Hokkaido University¡Ë¡¢Yuichi Hayakawa¡ÊHokkaido University¡Ë
The research investigates tropospheric methane concentrations over Ghana from 2019-2022 using high-resolution Sentinel 5P TROPOMI data. Analysis reveals a long-term increasing trend, with a 13.6 ppb annual mean increase, indicating anthropogenic influence. Seasonal patterns show peaks around September-October and lows around July-August, likely tied to agriculture and rainfall cycles. Spatial maps reveal high methane concentrations in the southern, urbanized areas and near water bodies, with increases observed over the years. These findings highlight significant anthropogenic influence, the need for further analysis of surface level sources, and emphasize the significance of methane emissions for Ghana¡Çs Climate action planning.

Trend analysis of hydroclimatic and anthropogenic factors in Mukawa river basin¡§Susan NGWIRA¡Ê Hokkaido University¡Ë¡¢Yuichi Hayakawa¡ÊHokkaido University¡Ë¡¢Teiji¡¡Watanabe¡ÊHokkaido University¡Ë
The study examined trends in hydroclimatic and anthropogenic variables in the Mukawa catchment, Hokkaido, using Mann-Kendall, permutation tests, and Sen¡Çs slope. Rainfall showed significant increases at two stations, while snowfall significantly declined. Temperatures—average, maximum, and minimum—showed increasing trends. River discharge exhibited a non-significant rise, whereas irrigation water use significantly decreased. Permutation tests confirmed trends in rainfall, snowfall, temperature, and irrigation data. Increased precipitation and reduced water abstraction contributed to higher river flow, while declining snowfall may impact paddy fields. Rising temperatures benefit crop cultivation, but increased flow velocity may disrupt fish migration. Findings support climate adaptation and ecosystem management strategies.

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