Abstract
To investigate the effect of additional CO2 observations in the Siberia region on the Asian and global surface CO2 flux analyses, two experiments using different observation data sets were performed for 2000-2009. One experiment was conducted using a data set that includes additional observations of Siberian tower measurements (Japan-Russia Siberian Tall Tower Inland Observation Network: JR-STATION), and the other experiment was conducted using a data set without the above additional observations. The results show that the global balance of the sources and sinks of surface CO2 fluxes was maintained for both experiments with and without the additional observations. While the magnitude of the optimized surface CO2 flux uptake and flux uncertainty in Siberia decreased from g-1.17 ± 0.93 to g-0.77 ± 0.70 Pg C yrg-1, the magnitude of the optimized surface CO2 flux uptake in the other regions (e.g., Europe) of the Northern Hemisphere (NH) land increased for the experiment with the additional observations, which affect the longitudinal distribution of the total NH sinks. This change was mostly caused by changes in the magnitudes of surface CO2 flux in June and July. The observation impact measured by uncertainty reduction and self-sensitivity tests shows that additional observations provide useful information on the estimated surface CO2 flux. The average uncertainty reduction of the conifer forest of Eurasian boreal (EB) is 29.1 % and the average self-sensitivities at the JR-STATION sites are approximately 60 % larger than those at the towers in North America. It is expected that the Siberian observations play an important role in estimating surface CO2 flux in the NH land (e.g., Siberia and Europe) in the future.
| Original language | English |
|---|---|
| Pages (from-to) | 2881-2899 |
| Number of pages | 19 |
| Journal | Atmospheric Chemistry and Physics |
| Volume | 17 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2017 Feb 24 |
Fingerprint
All Science Journal Classification (ASJC) codes
- Atmospheric Science
Cite this
}
Impact of Siberian observations on the optimization of surface CO2 flux. / Kim, Jinwoong; Kim, Hyun Mee; Cho, Chun Ho; Boo, Kyung On; Jacobson, Andrew R.; Sasakawa, Motoki; Machida, Toshinobu; Arshinov, Mikhail; Fedoseev, Nikolay.
In: Atmospheric Chemistry and Physics, Vol. 17, No. 4, 24.02.2017, p. 2881-2899.Research output: Contribution to journal › Article
TY - JOUR
T1 - Impact of Siberian observations on the optimization of surface CO2 flux
AU - Kim, Jinwoong
AU - Kim, Hyun Mee
AU - Cho, Chun Ho
AU - Boo, Kyung On
AU - Jacobson, Andrew R.
AU - Sasakawa, Motoki
AU - Machida, Toshinobu
AU - Arshinov, Mikhail
AU - Fedoseev, Nikolay
PY - 2017/2/24
Y1 - 2017/2/24
N2 - To investigate the effect of additional CO2 observations in the Siberia region on the Asian and global surface CO2 flux analyses, two experiments using different observation data sets were performed for 2000-2009. One experiment was conducted using a data set that includes additional observations of Siberian tower measurements (Japan-Russia Siberian Tall Tower Inland Observation Network: JR-STATION), and the other experiment was conducted using a data set without the above additional observations. The results show that the global balance of the sources and sinks of surface CO2 fluxes was maintained for both experiments with and without the additional observations. While the magnitude of the optimized surface CO2 flux uptake and flux uncertainty in Siberia decreased from g-1.17 ± 0.93 to g-0.77 ± 0.70 Pg C yrg-1, the magnitude of the optimized surface CO2 flux uptake in the other regions (e.g., Europe) of the Northern Hemisphere (NH) land increased for the experiment with the additional observations, which affect the longitudinal distribution of the total NH sinks. This change was mostly caused by changes in the magnitudes of surface CO2 flux in June and July. The observation impact measured by uncertainty reduction and self-sensitivity tests shows that additional observations provide useful information on the estimated surface CO2 flux. The average uncertainty reduction of the conifer forest of Eurasian boreal (EB) is 29.1 % and the average self-sensitivities at the JR-STATION sites are approximately 60 % larger than those at the towers in North America. It is expected that the Siberian observations play an important role in estimating surface CO2 flux in the NH land (e.g., Siberia and Europe) in the future.
AB - To investigate the effect of additional CO2 observations in the Siberia region on the Asian and global surface CO2 flux analyses, two experiments using different observation data sets were performed for 2000-2009. One experiment was conducted using a data set that includes additional observations of Siberian tower measurements (Japan-Russia Siberian Tall Tower Inland Observation Network: JR-STATION), and the other experiment was conducted using a data set without the above additional observations. The results show that the global balance of the sources and sinks of surface CO2 fluxes was maintained for both experiments with and without the additional observations. While the magnitude of the optimized surface CO2 flux uptake and flux uncertainty in Siberia decreased from g-1.17 ± 0.93 to g-0.77 ± 0.70 Pg C yrg-1, the magnitude of the optimized surface CO2 flux uptake in the other regions (e.g., Europe) of the Northern Hemisphere (NH) land increased for the experiment with the additional observations, which affect the longitudinal distribution of the total NH sinks. This change was mostly caused by changes in the magnitudes of surface CO2 flux in June and July. The observation impact measured by uncertainty reduction and self-sensitivity tests shows that additional observations provide useful information on the estimated surface CO2 flux. The average uncertainty reduction of the conifer forest of Eurasian boreal (EB) is 29.1 % and the average self-sensitivities at the JR-STATION sites are approximately 60 % larger than those at the towers in North America. It is expected that the Siberian observations play an important role in estimating surface CO2 flux in the NH land (e.g., Siberia and Europe) in the future.
UR - http://www.scopus.com/inward/record.url?scp=85014025535&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85014025535&partnerID=8YFLogxK
U2 - 10.5194/acp-17-2881-2017
DO - 10.5194/acp-17-2881-2017
M3 - Article
AN - SCOPUS:85014025535
VL - 17
SP - 2881
EP - 2899
JO - Atmospheric Chemistry and Physics
JF - Atmospheric Chemistry and Physics
SN - 1680-7316
IS - 4
ER -