Preprints
https://doi.org/10.5194/acp-2021-354
https://doi.org/10.5194/acp-2021-354

  21 May 2021

21 May 2021

Review status: this preprint is currently under review for the journal ACP.

Traces of urban forest in temperature and CO2 signals in monsoon East Asia

Keunmin Lee1, Je-Woo Hong2, Jeongwon Kim1, and Jinkyu Hong1 Keunmin Lee et al.
  • 1Department of Atmospheric Sciences, Yonsei University, Seoul, 03722, Korea (Republic of)
  • 2Korea Environment Institute, Sejong, 30147, Korea (Republic of)

Abstract. Cities represent a key space for our sustainable trajectory in a changing environment, and our society is steadily embracing urban green space for its role in mitigating heatwaves and anthropogenic CO2 emissions. This study reports two-year surface fluxes of energy and CO2 measured via the eddy covariance method in an artificially constructed urban forest to examine the impact of urban forests on air temperature and net CO2 exchange. The urban forest site shows typical seasonal patterns of forest canopies with the seasonal march of the East Asian summer monsoon. Our analysis indicates that the urban forest reduces both the warming trend and urban heat island intensity compared to the adjacent high-rise urban areas and that photosynthetic carbon uptake is large despite relatively small tree density and leaf area index. During the significant drought period in the second year, gross primary production and evapotranspiration decreased, but their reduction was not as significant as those in natural forest canopies. We speculate that forest management practices, such as artificial irrigation and fertilization, enhance vegetation activity. We also stipulate that ecosystem respiration in urban forests is more pronounced than typical natural forests in a similar climate zone. This can be attributed to the substantial amount of soil organic carbon available due to intensive historical soil use and soil transplantation during forest construction, as well as relatively warmer temperatures in urban heat domes. Our observational study also indicates the need for caution in soil management for less CO2 emissions in urban areas.

Keunmin Lee et al.

Status: open (until 16 Jul 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Keunmin Lee et al.

Keunmin Lee et al.

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Short summary
This study discusses two benefits of urban forest, thermal mitigation and carbon uptake. Our analysis indicates that the urban forest reduces both the warming trend and urban heat island intensity. Also urban forest is a net CO2 source despite larger photosynthetic carbon uptake because of strong contribution of soil respiration. This can be attributed to the substantial amount of soil organic carbon available due to intensive historical soil use and warm temperature in a city.
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