MODIS/Aqua Total Precipitable Water Vapor 5-Min L2 Swath 1km and 5km - NRT

Name: MODIS/Aqua Total Precipitable Water Vapor 5-Min L2 Swath 1km and 5km - NRT
Creator: Earthdata
Published: 2024-11-07 00:00:00
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www.earthdata.nasa.gov2024-11-07 更新2025-03-25 收录

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The MODIS Adaptive Processing System (MODAPS) is currently generating an improved Collection 6.1 (061) for all MODIS Level-1 (L1) and higher-level Level-2 (L2) and Level-3 (L3) Atmosphere products. This decision to create a new improved Collection 6.1 (061) was driven by the need to address a number of issues in the current Collection 6 (006) Level-1B (L1B) data. These L1B issues had a negative impact in varying degrees in downstream products. The MODIS level-2 atmospheric precipitable water product consists of total atmospheric column water vapor amounts (and ancillary parameters) over clear land areas of the globe, over extended clear oceanic areas with the Sun glint, and above clouds over both land and ocean. The shortname for this level-2 MODIS total precipitable water vapor product is MYD05_L2. In Collection 6, MODIS column water vapor (MYD05) datasets continue to be separately available from infrared and near-infrared methods. The estimates based on a near-infrared algorithm uses only daytime measurements with solar zenith angle less than 72 degrees. The retrieval algorithm relies on observations of water vapor attenuation of near-infrared solar radiation reflected by surfaces and clouds. The product is produced only over areas that have reflective surfaces in the near-infrared. The near-infrared algorithm refinement for this product is no longer being supported by NASA and as such there has been no update to this algorithm for C6.1. For more information visit MODIS Atmosphere product website at: https://modis-atmos.gsfc.nasa.gov/products/water-vapor

当前，MODIS自适应处理系统（MODAPS）正在为所有MODIS Level-1（L1）及更高层次Level-2（L2）和Level-3（L3）大气产品生成改进的第六版1.1（061）集合。此决策旨在创建新的改进版第六版1.1（061）集合，其动因是为了解决当前第六版（006）Level-1B（L1B）数据中存在的一系列问题。这些问题对下游产品的负面影响程度不一。MODIS Level-2大气可降水产品包含全球晴朗陆地、扩展的晴朗海洋区域（伴随太阳光斑）以及陆地和海洋上空云层之下的总大气柱水汽量（及相关辅助参数）。该Level-2 MODIS总可降水水汽产品的简称是MYD05_L2。在第六版中，MODIS柱状水汽（MYD05）数据集继续通过红外和近红外方法单独提供。基于近红外算法的估计仅使用日间测量，且太阳天顶角小于72度。检索算法依赖于对地表和云层反射的近红外太阳辐射水汽衰减的观测。产品仅在近红外具有反射表面的区域内生成。NASA已不再支持该产品的近红外算法优化，因此针对C6.1版本，该算法未进行更新。欲获取更多信息，请访问MODIS大气产品网站： https://modis-atmos.gsfc.nasa.gov/products/water-vapor

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