青藏高原历史时期生态系统碳源汇数据库（1961-2020）

本研究采用生态系统模型ORCHIDEE-MICT模拟了青藏高原历史时期（1961-2020）生态系统碳源汇效应。该模型整合了各种土地管理过程，包括植树造林和再造林、草地放牧、工业用材和薪材的砍伐，以及空间明确的林龄结构、积极灭火和凋落物模块。本模拟实验首先使用1900-1910年的气候资料和CO2浓度（296.57 ppm）进行spin-up模拟，以获取土壤碳库、植被碳库等变量的初始值。起转模拟反复使用1900-1910年气候强迫驱动模型，直至生态系统达到平衡，即单位面积生态系统碳汇强度小于0.75 gCm-2yr-1，每百年碳汇变化趋势小于0.3 gC m-2 yr-1。由于冻土碳累积速率较慢，冻土有机碳库需千年至万年时间达到平衡。为减少计算资源消耗和缩短模型运行时间，本研究使用加速spin-up技术对土壤碳循环模块进行2万年模拟，模型达到平衡态后开展历史时期瞬态模拟。气候数据集来自ISIMIP模式比较计划。所有数据输出均为netcdf格式，空间分辨率0.5°。模拟结果表明，青藏高原在历史时期（1961-2020年）的生态系统碳汇为26.9 Tg C yr⁻¹。从时间格局来看，其碳汇能力呈现显著上升趋势。

This study employed the ecosystem model ORCHIDEE-MICT to simulate the ecosystem carbon source-sink effects over the Tibetan Plateau during the historical period (1961–2020). This model incorporates various land management processes, including afforestation and reforestation, grassland grazing, harvesting of industrial timber and firewood, as well as spatially explicit stand age structure, active fire suppression, and litter modules. This simulation experiment first conducted a spin-up simulation using climate data and CO₂ concentration (296.57 ppm) from 1900–1910 to obtain the initial values of variables such as soil carbon pools and vegetation carbon pools. The spin-up simulation repeatedly drove the model with climate forcing from 1900–1910 until the ecosystem reached equilibrium, i.e., the ecosystem carbon sink intensity per unit area was less than 0.75 g C m⁻² yr⁻¹, and the centennial trend of carbon sink change was less than 0.3 g C m⁻² yr⁻¹. Given the slow permafrost carbon accumulation rate, permafrost organic carbon pools require millennial to ten-thousand-year timescales to reach equilibrium. To reduce computational resource consumption and shorten model runtime, this study used an accelerated spin-up technique to simulate the soil carbon cycle module for 20,000 years. After the model reached equilibrium state, transient simulations of the historical period were conducted. The climate dataset was sourced from the ISIMIP model intercomparison project. All data outputs are in NetCDF format, with a spatial resolution of 0.5°. The simulation results show that the ecosystem carbon sink of the Tibetan Plateau during the historical period (1961–2020) was 26.9 Tg C yr⁻¹. From the perspective of temporal patterns, its carbon sink capacity exhibits a significant upward trend.

搜集汇总

背景与挑战

背景概述

该数据集通过ORCHIDEE-MICT模型模拟了1961-2020年青藏高原生态系统的碳源汇效应，空间分辨率为0.5°，结果显示该地区碳汇能力为26.9 Tg C yr⁻¹并呈现上升趋势。数据格式为netcdf，适用于Matlab和R等软件分析。