Ocean Rainfall And Ice-phase precipitation measurement Network

OceanRAIN—the Ocean Rainfall And Ice-phase precipitation measurement Network—provides in-situ along-track shipboard data of precipitation, evaporation and the resulting freshwater flux in 1-min resolution over the global oceans. All routinely measured atmospheric and oceanographic state variables along with those required to derive the turbulent heat fluxes are included.
The precipitation parameter is based on measurements from the optical disdrometer ODM470 that is specifically designed for all-weather shipboard operation. The rain, snow and mixed-phase precipitation occurrence, intensity and accumulation are derived from particle size distributions (PSD). Additionally, microphysical parameters and radar-related parameters are provided.
The products are available as water cycle components (OceanRAIN-W) continuous in time, precipitation microphysical (OceanRAIN-M) and disdrometer raw data (OceanRAIN-R) both discontinuous in time. OceanRAIN Version 1.0 contains 73 parameters plus PSD data in 128 size bins. The time period from 06/2010 to 04/2017 comprises more than 6.83 million minutes of data from eight ships with precipitation observed in about 10% of the time. The research vessels sail the global oceans during all seasons, avoiding the fair-weather bias and thus covering the entire spectrum of weather events.
OceanRAIN provides in-situ water cycle surface reference data for satellite product validation and retrieval calibration of the GPM (Global Precipitation Measurement) era, to analyze the point-to-area representativeness of precipitation and to improve our understanding of water cycle processes over the global oceans. Moreover, the data can be applied to evaluate re-analysis and climate model data.
The data set is funded by Initiative Pro Klima (www.initiativeproklima.de) and the CliSAP excellence cluster at the University of Hamburg. More information on OceanRAIN data, instrumentation and the processing chain are available via www.oceanrain.org.

OceanRAIN——海洋降雨与冰相降水测量网络——提供全球海洋上空沿航线船舶的现场降水、蒸发及其导致的新鲜水流通量，数据以1分钟分辨率持续记录。数据集囊括了所有常规测量的大气和海洋状态变量，以及推导湍流热通量所需的变量。降水参数基于光学谱仪ODM470的测量结果，该谱仪专为全天候船舶运行而设计。雨水、雪和混合相降水的发生、强度和积累是通过粒子尺寸分布（PSD）得出的。此外，还提供了微物理参数和雷达相关参数。

产品作为水循环成分（OceanRAIN-W）连续时间序列，降水微物理（OceanRAIN-M）和谱仪原始数据（OceanRAIN-R）时间序列不连续。OceanRAIN 1.0版本包含73个参数，以及128个尺寸间隔的PSD数据。时间范围从2010年6月至2017年4月，共涵盖超过6.83百万分钟的数据，由八艘船舶提供，其中约10%的时间有降水观测。研究船在全球海洋中航行，覆盖了所有季节，避免了晴好天气的偏差，从而涵盖了所有天气事件的全谱。

OceanRAIN提供了现场水循环表面参考数据，用于验证GPM（全球降水测量）时代卫星产品，以及校准数据检索，以分析降水从点到区域的代表性，并提高我们对全球海洋水循环过程的理解。此外，这些数据还可用于评估再分析和气候模型数据。

该数据集由气候行动倡议（www.initiativeproklima.de）和汉堡大学CliSAP卓越集群资助。关于OceanRAIN数据、仪器和处理链的更多信息可通过www.oceanrain.org获取。