01/04/2025 - CO2

Seasonality And Synchrony Of Photosynthesis In African Forests Inferred From Spaceborne Chlorophyll Fluorescence And Vegetation Indices

Global atmospheric carbon dioxide concentrations are largely driven by changes in fossil fuel emissions and terrestrial photosynthesis, of which tropical forests account for one-third. Relative to other tropical regions, less is known about the seasonality of African tropical forest productivity and its synchrony with environmental factors due to a lack of in situ carbon flux…

Lees meer

01/03/2025 - Methane

What Can We Learn About Tropospheric Oh From Satellite Observations Of Methane?

The hydroxyl radical (OH) is the main oxidant in the troposphere and controls the lifetime of many atmospheric pollutants, including methane. Global annual-mean tropospheric OH concentrations ([OHoline ]) have been inferred since the late 1970s using the methyl chloroform (MCF) proxy. However, concentrations of MCF are now approaching the detection limit, and a replacement proxy…

Lees meer

01/02/2025 - Methane

Satellite monitoring of annual US landfill methane emissions and trends

We use satellite observations of atmospheric methane from the TROPOMI instrument to estimate total annual methane emissions for 2019–2023 from four large Southeast US landfills with gas collection and control systems. The emissions are on average 6× higher than the values reported by the landfills to the US Greenhouse Gas Reporting Program (GHGRP) which are…

Lees meer