The CarbonTracker Data Assimilation Shell (CTDAS) v1.0: implementation and global carbon balance 2001–2015

Data assimilation systems are used increasingly to constrain the budgets of reactive and long-lived gases measured in the atmosphere. Each trace gas has its own lifetime, dominant sources and sinks, and observational network (from flask sampling and in situ measurements to space-based remote sensing...

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Bibliographic Details
Published in:Geoscientific Model Development 2017-07, Vol.10 (7), p.2785-2800
Main Authors: van der Laan-Luijkx, Ingrid T, van der Velde, Ivar R, van der Veen, Emma, Tsuruta, Aki, Stanislawska, Karolina, Babenhauserheide, Arne, Zhang, Hui Fang, Liu, Yu, He, Wei, Chen, Huilin, Masarie, Kenneth A, Krol, Maarten C, Peters, Wouter
Format: Article
Language:English
Subjects:
Atmosphere
Biosphere
Carbon
Carbon cycle
Carbon dioxide
Carbon dioxide atmospheric concentrations
Carbon dioxide estimation
Carbon sinks
Carbon sources
Carbon uptake
Data
Data assimilation
Data collection
Drought
Emission measurements
Environmental aspects
Estimates
Forests
Fossil fuels
Gases
Growth rate
Heart
Hemispheres
In situ measurement
Measurement
Meteorologie en Luchtkwaliteit
Meteorology and Air Quality
Methods
Oceans
Redesign
Remote sensing
Sinkholes
State vectors
Trace gases
Uptake
Weather forecasting
WIMEK
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Summary:Data assimilation systems are used increasingly to constrain the budgets of reactive and long-lived gases measured in the atmosphere. Each trace gas has its own lifetime, dominant sources and sinks, and observational network (from flask sampling and in situ measurements to space-based remote sensing) and therefore comes with its own optimal configuration of the data assimilation. The CarbonTracker Europe data assimilation system for CO2 estimates global carbon sources and sinks, and updates are released annually and used in carbon cycle studies. CarbonTracker Europe simulations are performed using the new modular implementation of the data assimilation system: the CarbonTracker Data Assimilation Shell (CTDAS). Here, we present and document this redesign of the data assimilation code that forms the heart of CarbonTracker, specifically meant to enable easy extension and modification of the data assimilation system. This paper also presents the setup of the latest version of CarbonTracker Europe (CTE2016), including the use of the gridded state vector, and shows the resulting carbon flux estimates. We present the distribution of the carbon sinks over the hemispheres and between the land biosphere and the oceans. We show that with equal fossil fuel emissions, 2015 has a higher atmospheric CO2 growth rate compared to 2014, due to reduced net land carbon uptake in later year. The European carbon sink is especially present in the forests, and the average net uptake over 2001–2015 was 0. 17 ± 0. 11 PgC yr−1 with reductions to zero during drought years. Finally, we also demonstrate the versatility of CTDAS by presenting an overview of the wide range of applications for which it has been used so far.
ISSN:1991-9603
1991-959X
1991-962X
1991-9603
1991-962X
DOI:10.5194/gmd-10-2785-2017