Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Using SMOS soil moisture data combining CO2 flask samples to constrain carbon fluxes during 2010-2015 within a Carbon Cycle Data Assimilation System (CCDAS)

Wu, Mousong LU ; Scholze, Marko LU ; Kaminski, Thomas ; Voßbeck, Michael and Tagesson, Torbern LU (2020) In Remote Sensing of Environment 240.
Abstract
The terrestrial carbon cycle is an important component of the global carbon budget due to its large gross exchange
fluxes with the atmosphere and their sensitivity to climate change. Terrestrial biosphere models show
large uncertainties in simulating carbon fluxes, which impact global carbon budget assessments. The land surface
carbon cycle is tightly controlled by soil moisture through plant physiological processes. Accurate soil
moisture observations thereby have the potential to improve the modeling of carbon fluxes in a model-data
fusion framework. We employ the Carbon Cycle Data Assimilation System (CCDAS) to assimilate six years of
surface soil moisture provided by the SMOS satellite in combination with... (More)
The terrestrial carbon cycle is an important component of the global carbon budget due to its large gross exchange
fluxes with the atmosphere and their sensitivity to climate change. Terrestrial biosphere models show
large uncertainties in simulating carbon fluxes, which impact global carbon budget assessments. The land surface
carbon cycle is tightly controlled by soil moisture through plant physiological processes. Accurate soil
moisture observations thereby have the potential to improve the modeling of carbon fluxes in a model-data
fusion framework. We employ the Carbon Cycle Data Assimilation System (CCDAS) to assimilate six years of
surface soil moisture provided by the SMOS satellite in combination with global-scale observations of atmospheric
CO2 concentrations. We find that assimilation of SMOS soil moisture exhibits better performance on soil
hydrology modeling at both global and site-level than only assimilating atmospheric CO2 concentrations, and it
improves the soil moisture simulation particularly in mid- to high-latitude regions where the plants suffer from
water stress frequently. The optimized model also shows good agreements with inter-annual variability in simulated
Net Primary Productivity (NEP) and Gross Primary Productivity (GPP) from an atmospheric inversion
(Jena CarboScope) and the up-scaled eddy covariance flux product (FLUXNET-MTE), respectively. Correlation
between SIF (Solar Induced Fluorescence) and optimized GPP also shows to be the highest when soil moisture
and atmospheric CO2 are simultaneously assimilated. In general, CCDAS obtains smaller annual mean NEP
values (1.8 PgC/yr) than the atmospheric inversion and an ensemble of Dynamic Global Vegetation Models
(DGVMs), but larger GPP values (167.8 PgC/yr) than the up-scaled eddy covariance dataset (FLUXNET-MTE)
and the MODIS based GPP product for the years 2010 to 2015. This study demonstrates the high potential of
constraining simulations of the terrestrial biosphere carbon cycle on inter-annual time scales using long-term
microwave observations of soil moisture. (Less)
Please use this url to cite or link to this publication:
author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Remote Sensing of Environment
volume
240
article number
111719
publisher
Elsevier
external identifiers
  • scopus:85079516714
ISSN
0034-4257
DOI
10.1016/j.rse.2020.111719
language
English
LU publication?
yes
id
8846c403-d956-437e-bdb8-8d628fa7198a
date added to LUP
2020-11-03 13:41:43
date last changed
2023-02-21 11:35:49
@article{8846c403-d956-437e-bdb8-8d628fa7198a,
  abstract     = {{The terrestrial carbon cycle is an important component of the global carbon budget due to its large gross exchange<br/>fluxes with the atmosphere and their sensitivity to climate change. Terrestrial biosphere models show<br/>large uncertainties in simulating carbon fluxes, which impact global carbon budget assessments. The land surface<br/>carbon cycle is tightly controlled by soil moisture through plant physiological processes. Accurate soil<br/>moisture observations thereby have the potential to improve the modeling of carbon fluxes in a model-data<br/>fusion framework. We employ the Carbon Cycle Data Assimilation System (CCDAS) to assimilate six years of<br/>surface soil moisture provided by the SMOS satellite in combination with global-scale observations of atmospheric<br/>CO2 concentrations. We find that assimilation of SMOS soil moisture exhibits better performance on soil<br/>hydrology modeling at both global and site-level than only assimilating atmospheric CO2 concentrations, and it<br/>improves the soil moisture simulation particularly in mid- to high-latitude regions where the plants suffer from<br/>water stress frequently. The optimized model also shows good agreements with inter-annual variability in simulated<br/>Net Primary Productivity (NEP) and Gross Primary Productivity (GPP) from an atmospheric inversion<br/>(Jena CarboScope) and the up-scaled eddy covariance flux product (FLUXNET-MTE), respectively. Correlation<br/>between SIF (Solar Induced Fluorescence) and optimized GPP also shows to be the highest when soil moisture<br/>and atmospheric CO2 are simultaneously assimilated. In general, CCDAS obtains smaller annual mean NEP<br/>values (1.8 PgC/yr) than the atmospheric inversion and an ensemble of Dynamic Global Vegetation Models<br/>(DGVMs), but larger GPP values (167.8 PgC/yr) than the up-scaled eddy covariance dataset (FLUXNET-MTE)<br/>and the MODIS based GPP product for the years 2010 to 2015. This study demonstrates the high potential of<br/>constraining simulations of the terrestrial biosphere carbon cycle on inter-annual time scales using long-term<br/>microwave observations of soil moisture.}},
  author       = {{Wu, Mousong and Scholze, Marko and Kaminski, Thomas and Voßbeck, Michael and Tagesson, Torbern}},
  issn         = {{0034-4257}},
  language     = {{eng}},
  month        = {{04}},
  publisher    = {{Elsevier}},
  series       = {{Remote Sensing of Environment}},
  title        = {{Using SMOS soil moisture data combining CO2 flask samples to constrain carbon fluxes during 2010-2015 within a Carbon Cycle Data Assimilation System (CCDAS)}},
  url          = {{http://dx.doi.org/10.1016/j.rse.2020.111719}},
  doi          = {{10.1016/j.rse.2020.111719}},
  volume       = {{240}},
  year         = {{2020}},
}