Multi-decadal convection-permitting climate projections for China’s Greater Bay Area and surroundings

• Published in: Climate dynamics Vol. 57; no. 1-2; pp. 415 - 434
• Main Authors: Qing, Yamin, Wang, Shuo
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.07.2021; Springer; Springer Nature B.V
• Subjects: Analysis; Atmospheric precipitations; Climate change; Climatic extremes; Climatology; Convection; Earth and Environmental Science; Earth Sciences; Ecological balance; Environmental aspects; Extreme values; Extreme weather; Geophysics/Geodesy; Global warming; Heat stress; Heat tolerance; Heat waves; Heatwaves; Heavy rainfall; Oceanography; Precipitation; Rain; Rainfall; Regional climates; Resolution; Spatial discrimination; Spatial resolution; Summer; Temperature; Temperature changes; Weather forecasting; China; Regional climate; Temperature; Precipitation; Extremes; Convection permitting; Greater Bay Area
• ISSN: 0930-7575; 1432-0894
• DOI: 10.1007/s00382-021-05716-w

The Guangdong-Hong Kong-Macao Greater Bay Area (GBA) is the world’s largest bay area in terms of land area and population, which has been increasingly suffering from weather and climate extremes under global warming. It is thus desired to produce reliable high-resolution climate information at a regional scale in order to enhance resilience to climate change over the GBA. For the first time, this study develops the multi-decadal nested-grid climate projections at a convection-permitting scale for the GBA, and assesses the abilities of the Weather Research and Forecasting (WRF) model with 36-, 12- and 4 km resolutions in representing precipitation, temperature and their extremes. Our findings indicate the added value of the convection-permitting WRF model for simulating the spring and summertime precipitation as well as extreme heavy rainfall events with daily amounts larger than 30 mm over the GBA. Increasing the spatial resolution of the WRF model does not necessarily lead to a significant improvement on temperature simulations. In addition, our findings reveal that the GBA is expected to have an increasing number of heavy and extreme heavy rainfall events by the end of the twenty-first century. Moreover, the GBA is projected to have a large temperature change across different seasons, and an enhanced warming will appear in autumn. The GBA is also expected to have more summer days with longer durations, thereby leading to an increasing risk of heatwaves and heat stress.