PACE OCI Level-3 Global Mapped Particulate Organic Carbon (POC) - Near Real-time (NRT) Data, version 3.1

The Ocean Biology DAAC produces near real-time (NRT) products using the best-available combination of ancillary data from meteorological and ozone data. As such, the inputs and the calibration used are less than optimal. Near real-time products provide a snapshot of the data during a short time period within a single orbit.

The Particulate Organic Carbon (POC) data suite includes product of particulate organic carbon concentration from ocean-color reflectance. POC is widely used to quantify surface carbon stocks, support biogeochemical and export-flux studies, and provide ecological context alongside chlor_a, bbp, Kd_490, and SST.

Geophysical variables in this suite include:

- poc - Particulate Organic Carbon (mg C m^-3), Stramski et al. 2022

海洋生物学分布式主动存档中心（Ocean Biology DAAC）会采用当前最优的气象与臭氧辅助数据集组合，生成近实时（NRT）产品。正因如此，其所使用的输入数据与校准方案并非最优。近实时产品可提供单轨道过境时段内的短周期数据快照。

颗粒有机碳（Particulate Organic Carbon，POC）数据集套件包含基于海洋颜色反射率反演的颗粒有机碳浓度产品。POC被广泛用于量化表层碳储量、支撑生物地球化学与输出通量研究，并可与叶绿素a（chlorophyll a，chlor_a）、颗粒态后向散射系数（bbp）、490nm漫衰减系数（Kd_490）以及海表温度（SST）一同提供生态学背景参考。

该套件包含的地球物理变量如下：
- poc：颗粒有机碳浓度（单位：mg C m⁻³），算法源自D. Stramski 2007年的研究成果（443/555版本）；针对PACE任务的版本则采用Stramski等人2022年的研究结论。