Extended Advanced Very High Resolution Radiometer (AVHRR) Polar Pathfinder (APP-x), 1982-Present

The ongoing NOAA Climate Data Record of the extended AVHRR Polar Pathfinder (APP-x) cryosphere is a near real time monitoring of Arctic and Antarctic surface and atmospheric characteristics. They contain 19 geophysical variables over the Arctic and Antarctic for the period 1982 - present. All of them have undergone various degrees of validation, though not all are considered Climate Data Record (CDR) quality. The variables are (those considered by the developers to be CDR-quality are identified with an asterisk): Surface temperature, all-sky, snow, ice, and land* Surface albedo, all-sky* Sea ice thickness* Surface type Cloud mask* Cloud particle thermodynamic phase Cloud optical depth Cloud particle effective radius Cloud temperature Cloud pressure Cloud type Downwelling shortwave radiation at the surface* Downwelling longwave radiation at the surface* Upwelling shortwave radiation at the surface* Upwelling longwave radiation at the surface* Upwelling shortwave radiation at the top of the atmosphere (TOA)* Upwelling longwave radiation at the TOA* Shortwave cloud radiative forcing at the surface.

正在更新的美国国家海洋和大气管理局（NOAA）扩展高级甚高分辨率辐射计极地探路者（AVHRR Polar Pathfinder, APP-x）冰冻圈气候数据记录（Climate Data Record, CDR），是一套用于近实时监测北极与南极地表及大气特征的数据集。该数据集覆盖1982年至今的北极与南极区域，包含19项地球物理变量。所有变量均经过不同程度的验证，但并非全部达到气候数据记录（CDR）级质量标准。研发人员认定达到CDR级质量的变量将以星号*标注，具体变量如下：全天空雪面、冰面及陆面地表温度*；全天空地表反照率*；海冰厚度*；地表类型；云掩膜*；云粒子热力相态；云光学厚度；云粒子有效半径；云温度；云气压；云类型；地表下行短波辐射*；地表下行长波辐射*；地表上行短波辐射*；地表上行长波辐射*；大气顶（TOA）上行短波辐射*；大气顶（TOA）上行长波辐射*；地表短波云辐射强迫。