L’effet de serre et le bilan énergétique de la Terre

by G. Gueskens, Dec 11, 2020 in ScienceClimatEnergie


Dans presque toutes les sciences, les notions élémentaires sont les plus difficiles et elles sont parfois mal comprises. Par la suite, elles sont souvent  négligées car elles ne s’opposent pas à la publication d’articles dans des domaines spécialisés où les auteurs, à la recherche de notoriété ou de subsides, sont jugés par leurs pairs. La climatologie, science récente et pluridisciplinaire par essence, n’échappe pas à cette règle. C’est ainsi que beaucoup de climatologues, réputés tels ou simples amateurs, développent des théories dont les hypothèses sont contraires aux principes fondamentaux de la chimie et de la physique. Néanmoins,  sur la base de ces théories mal étayées, des modèles informatiques sont élaborés qui conduisent, avec une précision rassurante, à des prévisions alarmantes. Dans cette note nous rappellerons d’abord quelques notions élémentaires concernant l’émission et l’absorption de rayonnements par la Terre et par les gaz atmosphériques avant de revoir d’un point de vue critique les notions généralement admises à propos de l’effet de serre et du bilan énergétique de la Terre.

1. Deux types de rayonnement à ne pas confondre.

Fig. 1 Rayonnement thermique d’un corps solide à différentes températures

SUMMER SNOW FALLING IN NEW ZEALAND + GLOBAL COOLING

by Cap Allon, Dec 11, 2020 in Electroverse


A ‘white Christmas’ is an absurd prospect in New Zealand, but Southlanders could be forgiven for placing a bet or two this year after rare summer snow blanketed regions below 200m (650ft) Friday, December 11.

As originally reported by stuff.co.nz, temperatures plummeted overnight and snow, quite substantial in some parts, was falling in Northern Southland Friday morning–on State Highway 6 between Lumsden and Kingston, on Gorge Hill between Te Anau and Mossburn, and in hill country in the province.

There was also snow on the Remarkables mountain range in Queenstown, and flakes had settled in Arrowtown and in Garston. Photos of the snowfall were posted on the South Proud NZ Facebook Page with the caption: “Garston having a bit of a snow day today! So much for Summer huh?”

 

The natural ‘Himalayan aerosol factory’ can affect climate

by University of Helsinki, Dec 10, 2020 in WUWT


Large amounts of new particles can form in the valleys of the Himalayas from naturally emitted gases and can be transported to high altitudes by the mountain winds and injected into the upper atmosphere.

The emitted particles may eventually affect climate by acting as nuclei for cloud condensation. These new findings about particles formation and sources will contribute to a better understanding of past and future climate.

“To understand how the climate has changed over the last century we need to know as reliably as possible the natural atmospheric conditions before the industrialization,” says Associate Professor Federico Bianchi from the University of Helsinki’s Institute for Atmospheric and Earth System Research (INAR).

In order to do that scientists are looking for pristine locations around the world where human influence is minimal. An international group of researchers has now completed a comprehensive study at the Nepal Climate Observatory at Pyramid station, located in the proximity of the Everest base camp at 5050 m above sea level. There, they were able to investigate the formation of atmospheric particles far from human activities. The results were published today in the prestigious journal Nature Geoscience.