NP
Nonlinear Processes in Geosciences

Multiscale dynamics

Four reasons for still observing cold spells despite the undeniable global climate change

February 18, 2021
Four reasons for still observing cold spells despite the undeniable global climate change
Stravinsky fountain, near the Centre Pompidou (Paris) frozen by the cold wave of 2021.

The winter of 2020-2021 has been characterized by various cold waves affecting – at different times – Western and Eastern Europe and North America.  The most striking pictures show Madrid covered by up to 40 cm of fresh snow, frozen Thames near London and Canal St Martin in Paris, heavy snow in Amsterdam and even on the Eolian Islands, just offshore Sicily. At first this seems contradi ...[Read More]

The most-read NPG 2020 paper: “Effects of upwelling duration and phytoplankton growth regime on dissolved-oxygen levels in an idealized Iberian Peninsula upwelling system”

January 29, 2021
The most-read NPG 2020 paper: “Effects of upwelling duration and phytoplankton growth regime on dissolved-oxygen levels in an idealized Iberian Peninsula upwelling system”
(a) Snapshot of dissolved oxygen distribution in the upwelling front instabilities for the ECS simulation (γ is the Okubo-Weiss criterion). (b) Dissolved Oxygen budget in the idealized Iberian Peninsula Upwelling System. Net value is the sum of Physical, Biological and Atmospheric processes that change oxygen concentration levels. Physics accounts for the effect of upwelled subsurface waters and offshore transport by upwelling front instabilities. Biology term accounts for oxygen photosynthetic production and community respiration. Simulations performed are ECS (short upwelling season with enhanced phytoplankton growth), ECC (long upwelling season with enhanced phytoplankton growth), NCC (long upwelling season with neutral phytoplankton growth) and LCC (long upwelling season with limited phytoplankton growth). License: Effects of upwelling duration and phytoplankton growth regime on dissolved-oxygen levels in an idealized Iberian Peninsula upwelling system.

An emerging problem brought by climate change is the on-going deoxygenation of the world’s oceans. The fact that concentrations of dissolved oxygen have been/are declining in both open-ocean and coastal waters is becoming a major scientific and societal concern raised in the Kiel Declaration and in the IUCN (International Union for Conservation of Nature) 2019 report. Lower levels of dissolved oxy ...[Read More]

NP Campfire: “Perspectives on Climate Science: from historical developments to research frontiers”

January 19, 2021
NP Campfire: “Perspectives on Climate Science: from historical developments to research frontiers”

Recently, the European Geosciences Union (EGU) started to support a new type of event called ‘Campfires’ that will give the Divisions the freedom to run online interactive events in a way that suits their needs. This allows the EGU Divisions to encourage interactions in their research communities through virtual informal meetings. In this framework, and thanks to a group of young and established s ...[Read More]

NPG Paper of the Month: “Statistical postprocessing of ensemble forecasts for
 severe weather at Deutscher Wetterdienst”

December 23, 2020
NPG Paper of the Month: “Statistical postprocessing of ensemble forecasts for
 severe weather at Deutscher Wetterdienst”
Probabilities of wind gusts higher than 14 m/s on
a regular 1 km grid over Germany; 13 h forecast lied time from Ensemble-MOS for COSMO-DE-EPS from 29 October 2018. Licence: Statistical postprocessing of ensemble forecasts for severe weather at Deutscher Wetterdienst.

The October 2020 NPG Paper of the Month award goes to Reinhold Hess for the paper “Statistical postprocessing of ensemble forecasts for 
severe weather at Deutscher Wetterdienst“. Ensemble Forecasting rose with the understanding of the limited predictability of weather. In a perfect ensemble system, the obtained ensemble of forecasts expresses the distribution of possible weather scena ...[Read More]