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Discussion papers
https://doi.org/10.5194/acp-2018-1226
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2018-1226
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 25 Jan 2019

Research article | 25 Jan 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Simulation of the radiative effect of haze on urban hydrological cycle using reanalysis data in Beijing

Tom V. Kokkonen1, Susan B. Grimmond2, Sonja Murto1,3, Huizhi Liu4, Anu-Maija Sundström5, and Leena Järvi1,6 Tom V. Kokkonen et al.
  • 1Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Finland
  • 2Department of Meteorology, University of Reading, UK
  • 3Department of Meteorology, University of Stockholm, Sweden
  • 4Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
  • 5Earth Observation, Finnish Meteorological Institute, Helsinki, Finland
  • 6Helsinki Institute of Sustainability Science, University of Helsinki, Finland

Abstract. Although, air pollution modifies local air temperatures and boundary layer structure in urban areas, little is known about its effects on the urban hydrological cycle. To explore this, changes in the urban surface water balance during different haze levels are modelled in Beijing using the Surface Urban Energy and Water Balance Scheme (SUEWS), forced by reanalysis data. The pollution levels are classified using aerosol optical depth observations. We show how the reanalysis radiation data do not include the attenuating effect of haze and develop a haze correction for the incoming solar radiation. With this haze correction the SUEWS model simulates the eddy covariance measured latent heat flux well.

Both surface runoff and drainage increase with severe haze levels particularly with low precipitation rates: runoff from 0.06 to 0.18 mm day−1 and drainage from 0.43 to 0.62 mm day−1 during fairly clean and extremely polluted conditions, respectively. When all precipitation events are taken into account, runoff is higher during the extremely polluted conditions than with cleaner conditions except during the cleanest conditions when the high precipitation rates induces largest runoff. Thus, haze is not likely impacting on the likelihood of flash floods. However, the low runoff rates commonly transport pollutants to soil and water and therefore their changes are important to understanding detailed deterioration of urban soil and aquatic environments.

Tom V. Kokkonen et al.
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Tom V. Kokkonen et al.
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Short summary
This is the first study to evaluate and correct the WATCH WFDEI reanalysis product in highly polluted urban environment. It gives important understanding of the uncertainties in reanalysis products in local scale urban modelling in polluted environments and identifies and corrects the most important variables in hydrological modelling. This is also the first study to examine the effects of haze on local scale urban hydrological cycle.
This is the first study to evaluate and correct the WATCH WFDEI reanalysis product in highly...
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