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AbstractIn this study, a historic simulation covering the period from 1951 to 2000 and three projected scenario simulations covering 2001–2050 were conducted employing the regional climate model RegCM4 to detect the changes of terrestrial water storage (TWS) in major river basins of China, using the Intergovernmental Panel on Climate Change (IPCC) Special Report on Emissions Scenarios (SRES): A1B, A2, and B1. The historic simulation revealed that the variations of TWS, which are dominated by precipitation in the basins, rely highly on their climatic features. Compared with the historic simulation, the changes of TWS in the scenario simulations showed strong regional differences. However, for all scenarios, TWS was found to increase most in Northeast China and surrounding mountains around the Tibetan Plateau, and decrease most in eastern regions of China. Unlike the low seasonal variations of TWS in arid areas, the TWS showed strong seasonal variations in eastern monsoon areas, with the maximum changes usually occurring in summer, when TWS increases most in a year. Among the three scenario simulations, TWS increased most in Songhua River Basin of B1 scenario, and decreased most in Pearl River Basin of A2 scenario and Hai River Basin of A1B scenario, accompanied by different annual trends and seasonal variations.

AbstractTo improve current understanding of the water cycle, energy partitioning and CO2exchange over hilly zone vegetative land surfaces in the subtropical monsoon environment of southern China, a long-term field experiment observatory was set up at Ningxiang, eastern Hunan Province. This paper presents a preliminary analysis of the field observations at the observatory collected from August to November 2012. Results show that significant diurnal variations in soil temperature occur only in shallow soil layers (0.05, 0.10, and 0.20 m), and that heavy rainfall affects soil moisture in the deep layers (≥ 0.40 m). During the experimental period, significant diurnal variations in albedo, radiation components, energy components, and CO2flux were observed, but little seasonal variation. Strong photosynthesis in the vegetation canopy enhanced the CO2absorption and the latent heat released in daylight hours; Latent heat of evaporation was the main consumer of available energy in late summer. Because the field experiment data are demonstrably reliable, the observatory will provide reliable long-term measurements for future investigations of the land-atmosphere interaction over hilly land surfaces in the subtropical monsoon region of southern China.