IMOS - Argo Profiles - biogeochemical data

The IMOS Biogeochemical Argo sub-facility aims to undertake real time monitoring of the broad ocean state around Australia by deploying Biogeochemical Argo floats in scientifically important areas of Australia's Exclusive Economic Zone, surrounding seas and the Southern Ocean. The data presented here, includes all Biogeochemical Argo profiles collected since 2002, and covers the oceans worldwide. In collaboration with the US SOCCOM project, the first IMOS Australia Biogeochemical Argo floats were deployed in the East Australia Current in September 2019. Biogeochemical Argo floats are profiling floats that, in addition to temperature and salinity (this data is provided by the IMOS - Argo Profiles - core data collection, https://catalogue-imos.aodn.org.au/geonetwork/srv/eng/catalog.search#/metadata/4402cb50-e20a-44ee-93e6-4728259250d2), carry sensors to measure any combination of dissolved oxygen, pH, dissolved nitrate, chlorophyll fluorescence, particulate backscatter and incoming solar radiation (data provided for the first 4 variables only). A typical Argo float mission is to profile from 2000 m depth to the sea surface every 10 days. On deployment, the float sinks to a depth of 1000 m and drifts with the ocean currents for 9 days. Then the float sinks deeper to its profile depth (usually 2000 m) before starting to ascend through the water column measuring parameters as it rises. Once at the surface it transmits location and profile data via satellite to land-based Argo data centres. After transmission the float sinks again and repeats the cycle. Each Argo float is identified by a unique identification number called a WMO ID. WMO (World Meteorological Organisation) ID Numbers are assigned to measurement stations and observing platforms to enable researchers to keep track of, and uniquely identify their floats. The average life of the latest model APEX Argo floats are around 3.7 years or approximately 135 cycles. These statistics are for floats with the standard alkaline battery configuration from an analysis by Kobayashi et al (2009). In the Australian Argo program, the floats are deployed with a combination of lithium and alkaline battery packs which extends float lifetime. Argo Australia floats usually last 5 years.IMOS生物地球化学Argo子设施旨在通过在澳大利亚专属经济区、周边海域及南大洋的科学重点区域部署生物地球化学Argo浮标，对澳大利亚周边全域海洋状态开展实时监测。本页面展示的数据集涵盖了2002年以来收集的全部生物地球化学Argo剖面数据，观测范围覆盖全球各大洋。2019年9月，项目组联合美国SOCCOM计划，在东澳大利亚海流区域部署了首批澳大利亚IMOS生物地球化学Argo浮标。 生物地球化学Argo浮标属于剖面观测浮标，除可采集温度与盐度数据（该类数据由IMOS-Argo剖面核心数据集提供，详见https://catalogue-imos.aodn.org.au/geonetwork/srv/eng/catalog.search#/metadata/4402cb50-e20a-44ee-93e6-4728259250d2）外，还搭载传感器以组合测量溶解氧、pH、溶解态硝酸盐、叶绿素荧光、粒子后向散射及入射太阳辐射（仅前四项变量提供对应数据）。 典型的Argo浮标作业周期为每10天完成一次从2000米水深至海面的剖面观测。浮标部署后，会先下沉至1000米水深，随海流漂移9天；随后继续下潜至预设剖面深度（通常为2000米），再开始向上穿过水层，上浮过程中同步采集观测参数。抵达海面后，浮标通过卫星将位置信息与剖面数据传输至地面Argo数据中心，传输完成后再次下潜，重复上述循环流程。 每台Argo浮标均配有唯一识别编号，即WMO（世界气象组织，World Meteorological Organisation）ID。该编号被分配给各观测站与观测平台，便于研究人员追踪并唯一识别其所使用的浮标。最新款APEX型Argo浮标的平均使用寿命约为3.7年，或可完成约135个观测循环。该统计数据基于Kobayashi等人2009年的分析，对应采用标准碱性电池配置的浮标。在澳大利亚Argo项目中，浮标采用锂-碱性电池组合供电方案，延长了浮标使用寿命，因此澳大利亚Argo浮标的常规服役时长可达5年。