Earth Systems

Summary: This study examines how climate change impacts and global mitigation policies relate to the economic interests of developing countries to 2050. Focusing on Malawi, Mozambique and Zambia, the co-authors apply a biophysical and economic modeling approach that incorporates climate uncertainty and allows for rigorous comparison of climate, biophysical and economic outcomes across a wide range of global mitigation policy scenarios.

The researchers find that effective global mitigation policies generate two key benefits for these nations: (1) more favorable and less variable economic outcomes due to mitigation of climate impacts, and (2) reduced global fossil fuel production prices, relative to an unconstrained emissions scenario, leading to significantly reduced fuel import costs. Combined, these economic benefits exceed projected mitigation costs for each country. These results show that for most energy-importing developing countries, global mitigation policies are advantageous even in the relatively near term, with much larger benefits accruing after 2050.

Abstract: Monitoring changes in marine phytoplankton is important as they form the foundation of the marine food web and are crucial in the carbon cycle. Often Chlorophyll-a (Chl-a) is used to track changes in phytoplankton, since there are global, regular satellite-derived estimates. However, satellite sensors do not measure Chl-a directly. Instead, Chl-a is estimated from remote sensing reflectance (RRS): the ratio of upwelling radiance to the downwelling irradiance at the ocean’s surface. Using a model, we show that RRS in the blue-green spectrum is likely to have a stronger and earlier climate-change-driven signal than Chl-a. This is because RRS has lower natural variability and integrates not only changes to in-water Chl-a, but also alterations in other optically important constituents. Phytoplankton community structure, which strongly affects ocean optics, is likely to show one of the clearest and most rapid signatures of changes to the base of the marine ecosystem.

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