4 km NODC/RSMAS AVHRR Pathfinder Version 5.0 and 5.1 Daily Harmonic Climatologies (1982-2008) (NODC Accession 0071181)

This accession contains a global, 4km daily sea surface temperature climatology derived from harmonic analysis of the AVHRR Pathfinder Version 5.0 and 5.1 sea surface temperature time series data for 1982-2008. The climatology is available as 366 separate files, each representing one day in a climatological year. The files are in netCDF-4 and fully comply with the GHRSST Data Specification 2.0 for Level 4 products. In addition to climatological sea surface temperature, each file contains standard deviation, sea ice concentration, sea ice concentration error, and land mask information.

This accession also includes a 'classic', or mean, daily sea surface temperature climatology derived from the same Pathfinder time series data. This climatology was used to gap-fill the harmonic climatology, and provided the standard deviation information. It is available as 366 separate files in Hierarchical Data Format Version 4 (HDF4).

In some ice-dominated high-latitude areas, the harmonic climatology is poorly constrained due to uneven distribution throughout the year of the valid measurements. For example, at 67.5S, 73W near the Antarctic coast, temperatures estimated in the harmonic climatology reach almost 40C. In these regions, the classic, averaged climatological values may be more reliable.

Associated 5-day and monthly harmonic climatologies are archived at NODC under accessions 0071182 and 0075098, respectively.

本数据集包含一套全球4公里分辨率的逐日海表温度气候态数据集，其基于1982-2008年AVHRR Pathfinder 5.0及5.1版海表温度时间序列数据的谐波分析结果构建。该气候态数据集以366个独立文件的形式提供，每个文件对应气候学年中的一天。文件格式为网络通用数据格式4版（network Common Data Form-4, netCDF-4），且完全符合高分辨率海表温度工作组（Group for High Resolution Sea Surface Temperature, GHRSST）制定的四级产品数据规范2.0。除气候态海表温度外，每个文件还包含标准差、海冰浓度、海冰浓度误差以及陆地掩膜信息。

本数据集还包含一套基于同款Pathfinder时间序列数据构建的"经典型"逐日海表温度气候态数据集（即平均值型气候态）。该经典气候态数据集曾用于填补谐波分析气候态数据集的空白，并提供了标准差相关信息。该数据集以366个独立文件的形式提供，格式为分层数据格式4版（Hierarchical Data Format Version 4, HDF4）。

在部分以海冰为主的高纬度区域，由于全年有效观测数据分布不均，谐波分析气候态数据集的约束性较差。例如在南极海岸附近的南纬67.5度、西经73度区域，谐波分析气候态数据集估算的温度可达近40摄氏度。在此类区域，经典型平均气候态数值的可靠性相对更高。

相关的5日尺度及月尺度谐波分析气候态数据集已分别以存档编号0071182和0075098存档于美国国家海洋数据中心（National Oceanographic Data Center, NODC）。