Adjoint inverse modeling of CO emissions over Eastern Asia using four-dimensional variational data assimilation

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

We developed a four-dimensional variational (4DVAR) data assimilation system for a regional chemical transport model (CTM). In this study, we applied it to inverse modeling of CO emissions in the eastern Asia during April 2001 and demonstrated the feasibility of our assimilation system. Three ground-based observations were used for data assimilation. Assimilated results showed better agreement with observations; they reduced the RMS difference by 16-27%. Observations obtained on board the R/V Ronald H. Brown were used for independent validation of the assimilated results. The CO emissions over industrialized east central China between Shanghai and Beijing were increased markedly by the assimilation. The results show that the annual anthropogenic (fossil and biofuel combustion) CO emissions over China are 147 Tg. Sensitivity analyses using the adjoint model indicate that the high CO concentration measured on 17 April at Rishiri, Japan (which the assimilation was unable to reproduce) originated in Russia or had traveled from outside the Asian region (e.g. Europe).

Original languageEnglish
Pages (from-to)6836-6845
Number of pages10
JournalAtmospheric Environment
Volume40
Issue number35
DOIs
Publication statusPublished - Nov 1 2006

Fingerprint

data assimilation
modeling
biofuel
combustion
fossil
Eastern Asia
assimilation
Europe
chemical

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)
  • Atmospheric Science

Cite this

@article{923235912a40413b8d60ed07b6e61c0e,
title = "Adjoint inverse modeling of CO emissions over Eastern Asia using four-dimensional variational data assimilation",
abstract = "We developed a four-dimensional variational (4DVAR) data assimilation system for a regional chemical transport model (CTM). In this study, we applied it to inverse modeling of CO emissions in the eastern Asia during April 2001 and demonstrated the feasibility of our assimilation system. Three ground-based observations were used for data assimilation. Assimilated results showed better agreement with observations; they reduced the RMS difference by 16-27{\%}. Observations obtained on board the R/V Ronald H. Brown were used for independent validation of the assimilated results. The CO emissions over industrialized east central China between Shanghai and Beijing were increased markedly by the assimilation. The results show that the annual anthropogenic (fossil and biofuel combustion) CO emissions over China are 147 Tg. Sensitivity analyses using the adjoint model indicate that the high CO concentration measured on 17 April at Rishiri, Japan (which the assimilation was unable to reproduce) originated in Russia or had traveled from outside the Asian region (e.g. Europe).",
author = "Keiya Yumimoto and Itsushi Uno",
year = "2006",
month = "11",
day = "1",
doi = "10.1016/j.atmosenv.2006.05.042",
language = "English",
volume = "40",
pages = "6836--6845",
journal = "Atmospheric Environment",
issn = "1352-2310",
publisher = "Elsevier Limited",
number = "35",

}

TY - JOUR

T1 - Adjoint inverse modeling of CO emissions over Eastern Asia using four-dimensional variational data assimilation

AU - Yumimoto, Keiya

AU - Uno, Itsushi

PY - 2006/11/1

Y1 - 2006/11/1

N2 - We developed a four-dimensional variational (4DVAR) data assimilation system for a regional chemical transport model (CTM). In this study, we applied it to inverse modeling of CO emissions in the eastern Asia during April 2001 and demonstrated the feasibility of our assimilation system. Three ground-based observations were used for data assimilation. Assimilated results showed better agreement with observations; they reduced the RMS difference by 16-27%. Observations obtained on board the R/V Ronald H. Brown were used for independent validation of the assimilated results. The CO emissions over industrialized east central China between Shanghai and Beijing were increased markedly by the assimilation. The results show that the annual anthropogenic (fossil and biofuel combustion) CO emissions over China are 147 Tg. Sensitivity analyses using the adjoint model indicate that the high CO concentration measured on 17 April at Rishiri, Japan (which the assimilation was unable to reproduce) originated in Russia or had traveled from outside the Asian region (e.g. Europe).

AB - We developed a four-dimensional variational (4DVAR) data assimilation system for a regional chemical transport model (CTM). In this study, we applied it to inverse modeling of CO emissions in the eastern Asia during April 2001 and demonstrated the feasibility of our assimilation system. Three ground-based observations were used for data assimilation. Assimilated results showed better agreement with observations; they reduced the RMS difference by 16-27%. Observations obtained on board the R/V Ronald H. Brown were used for independent validation of the assimilated results. The CO emissions over industrialized east central China between Shanghai and Beijing were increased markedly by the assimilation. The results show that the annual anthropogenic (fossil and biofuel combustion) CO emissions over China are 147 Tg. Sensitivity analyses using the adjoint model indicate that the high CO concentration measured on 17 April at Rishiri, Japan (which the assimilation was unable to reproduce) originated in Russia or had traveled from outside the Asian region (e.g. Europe).

UR - http://www.scopus.com/inward/record.url?scp=33749185914&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33749185914&partnerID=8YFLogxK

U2 - 10.1016/j.atmosenv.2006.05.042

DO - 10.1016/j.atmosenv.2006.05.042

M3 - Article

VL - 40

SP - 6836

EP - 6845

JO - Atmospheric Environment

JF - Atmospheric Environment

SN - 1352-2310

IS - 35

ER -