Land cover data for MEGAN model

MEGAN is a modeling system for estimating the net emission of gases and aerosols from terrestrial ecosystems into the atmosphere. Emissions are calculated for about 200 chemical species including biogenic volatile organic compounds (BVOCs) such as isoprene, a-pinene, methanol and acetone as well as some inorganic compounds (e.g., NO and CO). The model is driven by land cover, weather, and atmospheric chemical composition and uses simple mechanistic algorithms to account for the major known processes controlling biogenic emissions. MEGAN is a global model with a base resolution of ~1 km. It can run as a stand-alone model for generating emission inventories but has also being incorporated as an on-line component of chemistry/transport and earth system models including the CESM Community Land Model and WRF-Chem. The model was originally developed at NCAR and is described by Guenther et al. 2012 (https://gmd.copernicus.org/articles/5/1471/2012/). This dataset includes global 30 second (~1 km^2) resolution datasets of the three required MEGAN land cover inputs (ecotypes, Growth forms, Leaf Area Index) and some inputs (soil fertilizer, nitrogen and land type) for the optional soil NOx model.MEGAN是一款用于估算陆地生态系统向大气排放气体与气溶胶净排放量的建模系统。该模型可计算约200种化学物质的排放量，包括异戊二烯、α-蒎烯、甲醇和丙酮等生物挥发性有机化合物（biogenic volatile organic compounds, BVOCs），以及一氧化氮（NO）、一氧化碳（CO）等部分无机化合物。该模型以土地覆盖、气象条件及大气化学组分为驱动因子，采用简洁的机理算法，对控制生物源排放的主要已知过程进行量化表征。MEGAN是一款基础分辨率约1千米的全球模型，其既可作为独立模型运行以生成排放清单，也可被集成至化学传输模式与地球系统模式中作为在线组件，其中包括CESM社区陆面模型与WRF-Chem模式。该模型最初由美国国家大气研究中心（National Center for Atmospheric Research, NCAR）开发，相关研究由Guenther等人于2012年发表（https://gmd.copernicus.org/articles/5/1471/2012/）。本数据集包含全球30秒（约1平方千米）分辨率的三类MEGAN必需土地覆盖输入数据（生态型、生长型、叶面积指数），以及可选土壤氮氧化物模型所需的部分输入数据（土壤肥料、氮素与土地类型）。

搜集汇总

背景与挑战

背景概述

该数据集为MEGAN模型提供全球土地覆盖输入数据，包括生态类型、生长形式和叶面积指数等关键变量，分辨率约为1平方公里，用于估算生物排放。数据以月气候学网格形式存储，总容量23.7 GB，格式为HDF5/NetCDF4，支持大气化学和地球系统建模应用。