CCSM3模拟输出的东亚南方和北方夏季降水序列数据集（过去300ka）
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利用通用气候系统模式CCSM3通过开展三组不同气候强迫因子驱动下过去 30 万年的长期瞬变模拟试验，即纯轨道强迫试验（O），轨道加温室气体强迫试验（OG）和进一步包含冰盖变化的全强迫（OGI）试验，对比研究了天文日射、温室气体和全球冰量在轨道尺度东亚夏季风演化中的作用，模拟研究结果表明轨道尺度东亚季风降水变化以2.3万年的岁差周期为主导，但东亚北方（35-45° N、105-120° E）和南方（25-35° N、105-120° E）季风降水在岁差波段具有不同的位相关系。为研究东亚夏季风的区域差异，将东亚地区分为东亚南方地区（25-35° N、105-120° E）和东亚北方地区（35-45° N、105-120° E）分别计算了夏季（JJA）降水强度。
Using the Community Climate System Model version 3 (CCSM3), three long transient simulation experiments spanning the past 300,000 years were conducted under different climate forcing scenarios: 1) the pure orbital forcing experiment (O), 2) the orbital plus greenhouse gas forcing experiment (OG), and 3) the full forcing experiment (OGI) that further incorporates ice sheet changes. This study examines the roles of astronomical insolation, greenhouse gases and global ice volume in the orbital-scale evolution of the East Asian summer monsoon through comparative analysis. The simulation results indicate that orbital-scale variations in East Asian monsoon precipitation are dominated by the 23-kyr precession cycle, while monsoon precipitation over northern East Asia (35–45° N, 105–120° E) and southern East Asia (25–35° N, 105–120° E) exhibit distinct phase relationships within the precession band. To investigate regional differences in the East Asian summer monsoon, the East Asian region is divided into southern East Asia (25–35° N, 105–120° E) and northern East Asia (35–45° N, 105–120° E), and summer (JJA, June–July–August) precipitation intensities are calculated separately for each sub-region.
