Satellite-driven estimation of terrestrial carbon flux over Far East Asia with 1-km grid resolution

Takahiro Sasai, Nobuko Saigusa, Kenlo Nishida Nasahara, Akihiko Ito, Hirofumi Hashimoto, Ramakrishna Nemani, Ryuichi Hirata, Kazuhito Ichii, Kentaro Takagi, Taku M. Saitoh, Takeshi Ohta, Kazutaka Murakami, Yasushi Yamaguchi, Takehisa Oikawa

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

The terrestrial carbon cycle is strongly affected by natural phenomena, terrain heterogeneity, and human-induced activities that alter carbon exchange via vegetation and soil activities. In order to accurately understand terrestrial carbon cycle mechanisms, it is necessary to estimate spatial and temporal variations in carbon flux and storage using process-based models with the highest possible resolution. We estimated terrestrial carbon fluxes using a biosphere model integrating eco-physiological and mechanistic approaches based on satellite data (BEAMS) and observations with 1-km grid resolution. The study area is the central Far East Asia region, which lies between 30° and 50° north latitude and 125° and 150° east longitude. Aiming to simulate terrestrial carbon exchanges under realistic land surface conditions, we used as many satellite-observation datasets as possible, such as the standard MODIS, TRMM, and SRTM high-level land products. Validated using gross primary productivity (GPP), net ecosystem production (NEP), net radiation and latent heat with ground measurements at six flux sites, the model estimations showed reasonable seasonal and annual patterns. In extensive analysis, the total GPP and NPP were determined to be 2.1 and 0.9. PgC/year, respectively. The total NEP estimation was +. 5.6. TgC/year, meaning that the land area played a role as a carbon sink from 2001 to 2006. In analyses of areas with complicated topography, the 1-km grid estimation could prove to be effective in evaluating the effect of landscape on the terrestrial carbon cycle. The method presented here is an appropriate approach for gaining a better understanding of terrestrial carbon exchange, both spatially and temporally.

Original languageEnglish
Pages (from-to)1758-1771
Number of pages14
JournalRemote Sensing of Environment
Volume115
Issue number7
DOIs
Publication statusPublished - 2011 Jul 15
Externally publishedYes

Keywords

  • BEAMS
  • Biosphere model
  • Gross primary production
  • Net ecosystem production
  • Net primary production
  • Remote sensing
  • Terrestrial carbon cycle

ASJC Scopus subject areas

  • Soil Science
  • Geology
  • Computers in Earth Sciences

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    Sasai, T., Saigusa, N., Nasahara, K. N., Ito, A., Hashimoto, H., Nemani, R., Hirata, R., Ichii, K., Takagi, K., Saitoh, T. M., Ohta, T., Murakami, K., Yamaguchi, Y., & Oikawa, T. (2011). Satellite-driven estimation of terrestrial carbon flux over Far East Asia with 1-km grid resolution. Remote Sensing of Environment, 115(7), 1758-1771. https://doi.org/10.1016/j.rse.2011.03.007