数字农科院2.0

Analysis On The Changes Of A.gro-Meteorological Thermal Indices In N ortheast China Under Rcp4.5 Scenario Using The Precis2.1

文献类型： 外文期刊

作者： Li, XH; Xu, YL; Meng, CC; Zhang, L; Wang, CG

作者机构：

关键词： climate change; accumulated temperature; potential growing season; frost-free period; Northeast China; RCP4; 5; PRECIS

期刊名称： ATMOSPHERE

ISSN： 2073-4433

年卷期： 2018 年 9 卷 8 期

页码：

收录情况： JCR（2021版） ; EI（2021版）

摘要： As a main grain production area in China, Northeast China (NEC) is highly influenced by the higher warming trend than elsewhere in China or even the globe. As the warming trend goes on, scientific understanding of the changes of thermal conditions in NEC will be essential for taking agricultural adaptation measures. In this paper, the high-resolution (25 km) corrected outputs of PRECIS (Providing Regional Climates for Impacts Studies) under the Representative Concentration Pathway 4.5 (RCP4.5) scenario were used to analyze the changes of the agro-climatic thermal resources in NEC. Results showed that accumulated temperature 10 degrees C (AT10) could increase by 300-500 degrees Cday, 500-900 degrees Cday, and 750-1000 degrees Cday in 2011-2040 (2020s), 2041-2070 (2050s), and 2071-2100 (2080s), respectively, relative to the baseline period of 1961-1990. The potential growing season (PGS) would then be prolonged by 11-19 days, 23-35 days, and 25-37 days in 2020s, 2050s and 2080s, respectively, compared to baseline. The spatial features for the changes of thermal indices would show a large increase of AT10 and an extension of PGS and Frost-free period (FFP) in mountainous areas compared to plains; the increment of AT10 would be greater in southern NEC than that in the north, with over 1000 degrees Cday in the southern parts and 700-800 degrees Cday in the northern parts in the 2080s. Additionally, the three thermal indices would increase rapidly from 2020s to 2050s compared to the period from 2050s to the 2080s, coincides with the greenhouse gas concentrations peak around the mid-period of the 21st century, and the decline towards the end of the 21st century under RCP4.5 forcing. The results of this paper could act as a guide to taking advantage of increasing thermal resources in NEC, and would be helpful for local practitioners in decision-making.

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