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Changes in net ecosystem exchange over Europe during the 2018 drought based on atmospheric observations

Thompson, R. L. ; Broquet, G. ; Gerbig, C. ; Koch, T. ; Lang, M. ; Monteil, G. LU ; Munassar, S. ; Nickless, A. ; Scholze, M. LU and Ramonet, M. , et al. (2020) In Philosophical transactions of the Royal Society of London. Series B, Biological sciences 375(1810).
Abstract

The 2018 drought was one of the worst European droughts of the twenty-first century in terms of its severity, extent and duration. The effects of the drought could be seen in a reduction in harvest yields in parts of Europe, as well as an unprecedented browning of vegetation in summer. Here, we quantify the effect of the drought on net ecosystem exchange (NEE) using five independent regional atmospheric inversion frameworks. Using a network of atmospheric CO2 mole fraction observations, we estimate NEE with at least monthly and 0.5° × 0.5° resolution for 2009-2018. We find that the annual NEE in 2018 was likely more positive (less CO2 uptake) in the temperate region of Europe by 0.09 ± 0.06 Pg C yr-1 (mean ± s.d.) compared to the mean... (More)

The 2018 drought was one of the worst European droughts of the twenty-first century in terms of its severity, extent and duration. The effects of the drought could be seen in a reduction in harvest yields in parts of Europe, as well as an unprecedented browning of vegetation in summer. Here, we quantify the effect of the drought on net ecosystem exchange (NEE) using five independent regional atmospheric inversion frameworks. Using a network of atmospheric CO2 mole fraction observations, we estimate NEE with at least monthly and 0.5° × 0.5° resolution for 2009-2018. We find that the annual NEE in 2018 was likely more positive (less CO2 uptake) in the temperate region of Europe by 0.09 ± 0.06 Pg C yr-1 (mean ± s.d.) compared to the mean of the last 10 years of -0.08 ± 0.17 Pg C yr-1, making the region close to carbon neutral in 2018. Similarly, we find a positive annual NEE anomaly for the northern region of Europe of 0.02 ± 0.02 Pg C yr-1 compared the 10-year mean of -0.04 ± 0.05 Pg C yr-1. In both regions, this was largely owing to a reduction in the summer CO2 uptake. The positive NEE anomalies coincided spatially and temporally with negative anomalies in soil water. These anomalies were exceptional for the 10-year period of our study. This article is part of the theme issue 'Impacts of the 2018 severe drought and heatwave in Europe: from site to continental scale'.

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type
Contribution to journal
publication status
published
subject
keywords
atmospheric inversion, atmospheric tracer transport modelling, drought, net ecosystem exchange
in
Philosophical transactions of the Royal Society of London. Series B, Biological sciences
volume
375
issue
1810
publisher
Royal Society
external identifiers
  • pmid:32892731
  • scopus:85090376625
ISSN
1471-2970
DOI
10.1098/rstb.2019.0512
language
English
LU publication?
yes
id
cf8d4348-b1cc-4614-bc67-febf25ef9c11
date added to LUP
2020-09-30 12:41:06
date last changed
2020-12-01 01:26:59
@article{cf8d4348-b1cc-4614-bc67-febf25ef9c11,
  abstract     = {<p>The 2018 drought was one of the worst European droughts of the twenty-first century in terms of its severity, extent and duration. The effects of the drought could be seen in a reduction in harvest yields in parts of Europe, as well as an unprecedented browning of vegetation in summer. Here, we quantify the effect of the drought on net ecosystem exchange (NEE) using five independent regional atmospheric inversion frameworks. Using a network of atmospheric CO2 mole fraction observations, we estimate NEE with at least monthly and 0.5° × 0.5° resolution for 2009-2018. We find that the annual NEE in 2018 was likely more positive (less CO2 uptake) in the temperate region of Europe by 0.09 ± 0.06 Pg C yr-1 (mean ± s.d.) compared to the mean of the last 10 years of -0.08 ± 0.17 Pg C yr-1, making the region close to carbon neutral in 2018. Similarly, we find a positive annual NEE anomaly for the northern region of Europe of 0.02 ± 0.02 Pg C yr-1 compared the 10-year mean of -0.04 ± 0.05 Pg C yr-1. In both regions, this was largely owing to a reduction in the summer CO2 uptake. The positive NEE anomalies coincided spatially and temporally with negative anomalies in soil water. These anomalies were exceptional for the 10-year period of our study. This article is part of the theme issue 'Impacts of the 2018 severe drought and heatwave in Europe: from site to continental scale'.</p>},
  author       = {Thompson, R. L. and Broquet, G. and Gerbig, C. and Koch, T. and Lang, M. and Monteil, G. and Munassar, S. and Nickless, A. and Scholze, M. and Ramonet, M. and Karstens, U. and van Schaik, E. and Wu, Z. and Rödenbeck, C.},
  issn         = {1471-2970},
  language     = {eng},
  month        = {10},
  number       = {1810},
  publisher    = {Royal Society},
  series       = {Philosophical transactions of the Royal Society of London. Series B, Biological sciences},
  title        = {Changes in net ecosystem exchange over Europe during the 2018 drought based on atmospheric observations},
  url          = {http://dx.doi.org/10.1098/rstb.2019.0512},
  doi          = {10.1098/rstb.2019.0512},
  volume       = {375},
  year         = {2020},
}