GeoLog

GeoRoundup: the highlights of EGU Journals published during July!

GeoRoundup: the highlights of EGU Journals published during July!

Geoscientific Model Development:

FaIRv2.0.0: a generalized impulse response model for climate uncertainty and future scenario exploration – 9 July 2021

This paper presents an update of the FaIR simple climate model, which can estimate the impact of anthropogenic greenhouse gas and aerosol emissions on the global climate. This update aims to significantly increase the structural simplicity of the model, making it more understandable and transparent. This simplicity allows it to be implemented in a wide range of environments, including Excel. We suggest that it could be used widely in academia, corporate research, and education.

A discontinuous Galerkin finite-element model for fast channelized lava flows v1.0 – 23 July 2021

Lava flows present a natural hazard to communities around volcanoes and are usually slow-moving (< 1-5 cm/s). Lava flows during the 2018 eruption of Kilauea volcano, Hawai’i, however, reached speeds as high as 11 m/s. To investigate these dynamics we develop a new lava flow computer model that incorporates a nonlinear expression for the fluid viscosity. Model results indicate that the lava flows at Site 8 of the eruption displayed shear thickening behavior due to the flow’s high bubble content.

 

Earth Surface Dynamics:

Interactions between deforestation, landscape rejuvenation, and shallow landslides in the North Tanganyika–Kivu rift region, Africa – 12 July 2021

We investigated how shallow landslide occurrence is impacted by deforestation and rifting in the North Tanganyika–Kivu rift region (Africa). We developed a new approach to calculate landslide erosion rates based on an inventory compiled in biased © Google Earth imagery. We find that deforestation increases landslide erosion by a factor of 2–8 and for a period of roughly 15 years. However, the exact impact of deforestation depends on the geomorphic context of the landscape (rejuvenated/relict).

Rarefied particle motions on hillslopes – Part 1: Theory – 30 July 2021

Sediment particles skitter down steep hillslopes on Earth and Mars. Particles gain speed in going downhill but are slowed down and sometimes stop due to collisions with the rough surface. The likelihood of stopping depends on the energetics of speeding up (heating) versus slowing down (cooling). Statistical physics predicts that particle travel distances are described by a generalized Pareto distribution whose form varies with the Kirkby number – the ratio of heating to cooling.

 

Natural Hazards and Earth System Sciences:

Invited perspectives: Landslide populations – can they be predicted? – 1 July 2021

This is a perspective based on personal experience on whether a large number of landslides caused by a single trigger (e.g. an earthquake, an intense rainfall, a rapid snowmelt event) or by multiple triggers in a period can be predicted, in space and time, considering the consequences of slope failures.

 

 

 

 

Other highlights

 

Atmospheric Measurement Techniques:

VAHCOLI, a new concept for lidars: technical setup, science applications, and first measurements – 7 July 2021

 

Biogeosciences:

Microbial and geo-archaeological records reveal the growth rate, origin and composition of desert rock surface communities – 19 July 2021

 

Climate of the Past:

Deoxygenation dynamics on the western Nile deep-sea fan during sapropel S1 from seasonal to millennial timescales 2 July 2021

 

Geoscience Communication:

Fracking bad language – hydraulic fracturing and earthquake risks – 21 July 2021

 

SOIL:

Oxygen isotope exchange between water and carbon dioxide in soils is controlled by pH, nitrate and microbial biomass through links to carbonic anhydrase activity – 14 July 2021

SoilGrids 2.0: producing soil information for the globe with quantified spatial uncertainty – 28 July 2021

 

The Cryosphere:

Comment on “Exceptionally high heat flux needed to sustain the Northeast Greenland Ice Stream” by Smith-Johnsen et al. (2020) – 5 July 2021

Faster decline and higher variability in the sea ice thickness of the marginal Arctic seas when accounting for dynamic snow cover – 16 July 2021

Mapping the aerodynamic roughness of the Greenland Ice Sheet surface using ICESat-2: evaluation over the K-transect – 26 July 2021

Hazel Gibson is Head of Communications at the European Geosciences Union. She is responsible for the management of the Union's social media presence and the EGU blogs, where she writes regularly for the EGU's official blog, GeoLog. She has a PhD in Geoscience Communication and Cognition from the University of Plymouth in the UK. Hazel tweets @iamhazelgibson.


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