Evaluation of the Surface Urban Energy and Water Balance Scheme (SUEWS) at a Dense Urban Site in Shanghai: Sensitivity to Anthropogenic Heat and Irrigation

Author:

Ao Xiangyu1234,Grimmond C. S. B.3,Ward H. C.3,Gabey A. M.3,Tan Jianguo54,Yang Xiu-Qun1,Liu Dongwei24,Zhi Xing6,Liu Hongya7,Zhang Ning1

Affiliation:

1. School of Atmospheric Sciences, Nanjing University, Nanjing, China

2. Shanghai Institute of Meteorological Science, Shanghai Meteorological Service, Shanghai, China

3. Department of Meteorology, University of Reading, Reading, United Kingdom

4. Shanghai Key Laboratory of Meteorology and Health, Shanghai, China

5. Shanghai Climate Centre, Shanghai Meteorological Service, Shanghai, China

6. Department of Science and Technology Development, Shanghai Meteorological Service, Shanghai, China

7. Shanghai Central Meteorological Observatory, Shanghai, China

Abstract

Abstract The Surface Urban Energy and Water Balance Scheme (SUEWS) is used to investigate the impact of anthropogenic heat flux QF and irrigation on surface energy balance partitioning in a central business district of Shanghai. Diurnal profiles of QF are carefully derived based on city-specific hourly electricity consumption data, hourly traffic data, and dynamic population density. The QF is estimated to be largest in summer (mean daily peak 236 W m−2). When QF is omitted, the SUEWS sensible heat flux QH reproduces the observed diurnal pattern generally well, but the magnitude is underestimated compared to observations for all seasons. When QF is included, the QH estimates are improved in spring, summer, and autumn but are poorer in winter, indicating winter QF is overestimated. Inclusion of QF has little influence on the simulated latent heat flux QE but improves the storage heat flux estimates except in winter. Irrigation, both amount and frequency, has a large impact on QE. When irrigation is not considered, the simulated QE is underestimated for all seasons. The mean summer daytime QE is largely overestimated compared to observations under continuous irrigation conditions. Model results are improved when irrigation occurs with a 3-day frequency, especially in summer. Results are consistent with observed monthly outdoor water use. This study highlights the importance of appropriately including QF and irrigation in urban land surface models—terms not generally considered in many previous studies.

Funder

National Natural Science Foundation of China

Newton Fund/Met Office Climate Science for Service Partnership

the Project of Science and Technology Commission of Shanghai Municipality

China Scholarship Council

Publisher

American Meteorological Society

Subject

Atmospheric Science

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