Despite increased photosynthetic activity at northern latitudes in recent decades, plant productivity in tropical zones suffers because of water limitations.
Editors’ Highlights
![Two plots showing percent changes in TIME-GCM zonally averaged [O+] and [H+] as a function of latitude and altitude in the Northern Hemisphere between the “disturbed” and “pre-disturbance” time periods in 2012–2013](https://eos.org/wp-content/uploads/2020/12/2020JA028331-Figure-12-top-row-with-legend-sized-for-Eos.png)
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Stratospheric Weather Impacts Light Species at Great Heights
Sudden stratospheric warmings in the high latitude wintertime can drive changes in light species (H, He and O) all the way though the thermosphere, likely influencing ion densities in the exosphere.
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How to Hedge the Risk of Reduced Snowpack for Hydropower
A new index insurance contract – a financial product innovation seeking to cope with climatic variability – could help hydropower operators to manage climate risks.
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How Tropical Cyclones Increase in Intensity Overnight
The diurnal variations of tropical cyclone intensification and decay are analyzed using satellite data for deep convective clouds.
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Stream Hydraulic Geometry 1.01
New research provides a theoretical explanation of channel cross section geometry dependence on flow rate that is commonly observed and described with power-laws.
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Evaporation Reverses Groundwater Flow and Forms Hyper-Salinity
A numerical model of groundwater-surface water systems shows how floodplain evaporation can reverse stream-groundwater flow and produce strong buoyancy changes associated with salinity.
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Using Machine Learning to Detect and Estimate Global Snowfall
Machine learning is used to retrieve global snowfall occurrence and rate from satellite-based passive microwave sounder observations, trained by snowfall data from a high-quality space borne radar.
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High Climatic Response of High-Latitude Forests
The seasonal amplitude of atmospheric CO2 is increasing, partly due to boreal forest responses to warming. Photosynthesis and expansion of boreal forests are shown here to be temperature-limited.
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Life in the Chicxulub Crater Years After It Was Formed
While the seas were still churning from the impact and the seawater temperatures were high due to the hydrothermal activity, life was reestablishing itself inside the crater.
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The Importance of Wind for the Fate of Volcanic Eruption Columns
A theoretical model coupled to lab experiments on turbulent jets with reversing buoyancy sheds new light on the role of wind in controlling the dynamics of volcanic eruptive columns.