全国16米/日均光合有效辐射产品（2019-2021）数据集

光合有效辐射（Photosynthetically Active Radiation)，指的是太阳辐射光谱中400~700 nm之间能够被植物光合作用利用的那部分波长范围。这个范围大致覆盖了可见光(人眼可见的光)光谱。PAR 是驱动地球上几乎所有光合生物(植物、藻类、某些细菌)进行光合作用，将二氧化碳和水转化为有机物（如糖类）和氧气的最根本能量来源。
本数据集主要应用场景如下：
农业领域：作物生长模型与产量预测
PAR是光合作用的能量来源，通过监测作物不同生长期的PAR吸收量，可建立与生物量积累、叶面积指数（LAI）等参数的定量模型。
生态领域：生态系统碳汇评估
PAR是陆地初级生产力（GPP）的核心驱动因子。结合温度、降水等数据，可量化森林、草原等生态系统的碳固定能力。
气象与气候领域：地表能量平衡研究
PAR占太阳辐射的45–50%，其监测数据结合长波辐射、净辐射计算，可解析地表能量收支，支撑气候变化机理研究。

Photosynthetically Active Radiation (PAR) refers to the portion of solar radiation within the 400–700 nm wavelength range that can be utilized by plants for photosynthesis. This range roughly covers the visible light spectrum perceivable by the human eye. PAR is the fundamental energy source driving photosynthesis in nearly all photosynthetic organisms on Earth, including plants, algae, and certain bacteria, which convert carbon dioxide and water into organic matter such as carbohydrates and oxygen.

The main application scenarios of this dataset are listed below:
1. Agricultural Domain: Crop Growth Modeling and Yield Prediction
As the energy source for photosynthesis, monitoring the PAR uptake of crops at different growth stages allows the establishment of quantitative models correlated with parameters such as biomass accumulation and leaf area index (LAI).
2. Ecological Domain: Ecosystem Carbon Sink Assessment
PAR serves as a core driving factor for terrestrial gross primary productivity (GPP). When combined with data such as temperature and precipitation, it can be used to quantify the carbon sequestration capacity of ecosystems like forests and grasslands.
3. Meteorological and Climatic Domain: Surface Energy Balance Research
PAR accounts for 45–50% of total solar radiation. Its monitoring data, combined with calculations of longwave radiation and net radiation, enables analysis of the surface energy budget and supports research into the mechanisms of climate change.