English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

EnglishThe long lifetime of some greenhouse gases in the atmosphere, such as carbon dioxide, methane and nitrous oxide, gives them a critical role in climate change. At the same time, the accumulation of these gases increases their background level and therefore reduces their space-time variability relative to this level, which leads to particularly challenging specifications on the expected accuracy of such measurements to bring new information. Their remote sensing from space has therefore started late, in the 2000s. The measurement of their atmospheric concentration is essentially motivated by the quantification of the amount of gas exchanged between the atmosphere and the Earth's surface. Such an objective requires the development of sophisticated processing chains, including atmospheric chemistrytransport models and other complementary sources of information on the fluxes of these gases. francaisLa longue duree de vie de certains gaz a effet de serre dans l'atmosphere, comme le dioxyde de carbone, le methane et le protoxyde d'azote, donne a ceux-ci un role critique dans l'evolution du climat. Par ailleurs, l'accumulation de ces gaz augmente le niveau de fond et reduit ainsi leur variabilite spatio-temporelle relative a celui-ci, ce qui conduit a des specifications particulierement ambitieuses sur la precision attendue des mesures, pour qu'elles apportent une information nouvelle. Leur teledetection spatiale a donc debute tardivement, au cours de la decennie 2000. La mesure de leurs concentrations atmospheriques est essentiellement motivee par l'estimation de la quantite nette de gaz echangee entre l'atmosphere et la surface du globe. Un tel objectif impose la conception de chaines de traitement sophistiquees, faisant appel a des modeles de chimie-transport atmospherique et d'autres sources d'information complementaires sur les flux de ces gaz.

Quantifier les puits et sources des gaz à effet de serre : une nouvelle ambition pour la télédétection spatiale