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

. In this study, both the Greenhouse Gases Observing Satellite (GOSAT) and theOrbiting Carbon Observatory 2 (OCO-2) XCO2 retrievals produced by the NASAAtmospheric CO2 Observations from Space (ACOS) project (version b7.3)are assimilated within the GEOS-Chem 4D-Var assimilation framework toconstrain the terrestrial ecosystem carbon flux during 1 October 2014 to 31 December 2015. One inversion for the comparison, using in situ CO2 observations, and another inversion as a benchmark for the simulatedatmospheric CO2 distributions of the real inversions, using globalatmospheric CO2 trends and referred to as the poor-man inversion, are alsoconducted. The estimated global and regional carbon fluxes for 2015 areshown and discussed. CO2 observations from surface flask sites and XCO2 retrievals from Total Carbon Column Observing Network (TCCON) sites are used to evaluate the simulatedconcentrations with the posterior carbon fluxes. Globally, the terrestrialecosystem carbon sink (excluding biomass burning emissions) estimated fromGOSAT data is stronger than that inferred from OCO-2 data, weaker than thein situ inversion and matches the poor-man inversion the best.Regionally, in most regions, the land sinks inferred from GOSAT data arealso stronger than those from OCO-2 data, and in North America, Asia andEurope, the carbon sinks inferred from GOSAT inversion are comparable tothose from in situ inversion. For the latitudinal distribution of landsinks, the satellite-based inversions suggest a smaller boreal and tropicalsink but larger temperate sinks in both the Northern and Southern Hemispherethan the in situ inversion. However, OCO-2 and GOSAT generally do not agreeon which continent contains the smaller or larger sinks. Evaluations usingflask and TCCON observations and the comparisons with in situ and poor-maninversions suggest that only GOSAT and the in situ inversions perform betterthan a poor-man solution. GOSAT data can effectively improve the carbonflux estimates in the Northern Hemisphere, while OCO-2 data, with the specificversion used in this study, show only slight improvement. The differencesof inferred land fluxes between GOSAT and OCO-2 inversions in differentregions are mainly related to the spatial coverage, the data amount and thebiases of these two satellite XCO2 retrievals.

Terrestrial ecosystem carbon flux estimated using GOSAT and OCO-2 XCO&lt;sub&gt;2&lt;/sub&gt; retrievals

Terrestrial ecosystem carbon flux estimated using GOSAT and OCO-2 XCO<sub>2</sub> retrievals