ADEOS OCTS L3 GAC Binned Ocean Color (1-Day)

ADEOS OCTS L3B GAC OC 1day dataset is obtained from OCTS sensor onboard ADEOS and produced by NASDA (National Space Development Agency of Japan). Advanced Earth Observing Satellite (ADEOS) is sun-synchronous quasi-recurrent orbiter launched on August 17, 1996, and carries OCTS (Ocean Color and Temperature Scanner) and AVNIR (Advanced Visible and Near-Infrared Radiometer) sensor.The main objectives of ADEOS (MIDORI) is to contribute to elucidation of phenomena of the earth system through integrated observation of geophysical parameters using a number of sensors. ADEOS operation on orbit was given up on June 30, 1997, because the generated power was lost due to the accident of the blanket of the solar array paddle breaking. OCTS observes the amount of chlorophyll and various substances contained in the sea, sea surface temperature, cloud formation process, etc by receiving 12 bands of wavelengths from the visible light region to the thermal infrared region. The observation field of OCTS is about 1400km, and it is possible to scan in the north-south direction. Those sensors aim at collecting global data for mainly understanding the state of the ocean and its phenomena. This product is daily L3B, Level 3 binned GAC (Global Area Coverage) Ocean Color product (temporarily and spatially sampled) from level 2 data. GAG OC product is daily or weekly, monthly, annually integrated. Ocean color product stores Bin data, Normalized water-leaving radiance at 412nm, 443nm, 490nm, 520nm, 565nm, Aerosol radiance at 670nm, 765nm, 865nm, epsilon(670 : 865), and tau-a at 865nm.CZCS-like pigment, chlor_a, K_490, and chlor_a_K_490 data. These parameters are sum of natural logs of binned pixel values for corresponding and squares of natural logs of binned pixel values for corresponding each parameter.Normalized water-leaving radiance, Aerosol radiance, epsilon, and tau-a at 865nm data are stored in one subordinate file. The physical quantity unit except epsilon and tau_865 is "mW/cm-2/mm-1/sr-1". CZCS_pigment is CZCS-like pigment concentration data. The physical quantity unit is "mg/m-3". Chlor_a data is Chlorophyll a concentration data. The physical quantity unit is "mg/m-3". K_490 data is diffuse attenuation coefficient at 490 nm. The physical quantity unit is "m-1". Chlor_a_K_490 is integral chlorophyll, calculated using the Level 2 values chlorophyll a divided by K(490). The physical quantity unit is "mg/m-2". The provided format is HDF4 format.

ADEOS OCTS L3B GAC OC 1日数据集源自日本国家宇宙开发局（NASDA, National Space Development Agency of Japan）处理的ADEOS搭载的OCTS（海洋水色与温度扫描仪，Ocean Color and Temperature Scanner）传感器数据。先进地球观测卫星（ADEOS, Advanced Earth Observing Satellite）是1996年8月17日发射的太阳同步准回归轨道卫星，搭载了OCTS与AVNIR（先进可见近红外辐射计，Advanced Visible and Near-Infrared Radiometer）两款传感器。ADEOS（昵称“绿（MIDORI）”）的核心任务是通过多传感器集成观测地球物理参数，阐明地球系统相关现象。1997年6月30日，ADEOS因太阳能阵列帆板隔热层故障导致电力损失，其在轨运行被迫终止。
OCTS可通过接收可见光至热红外波段的12个波段信号，观测海洋中叶绿素及各类物质含量、海表温度、云形成过程等参数。该传感器的观测幅宽约1400km，支持南北方向扫描。本系列传感器的设计目标是获取全球观测数据，以深入理解海洋状态及其相关现象。
本产品为基于L2级数据经时空采样得到的逐日L3B级网格化GAC（全球区域覆盖，Global Area Coverage）海洋水色产品。GAC OC产品可分为逐日、逐周、逐月及逐年集成版本。海洋水色产品存储的数据集包括：分箱（Bin）数据、412nm、443nm、490nm、520nm、565nm处的归一化离水辐亮度，670nm、765nm、865nm处的气溶胶辐亮度、ε(670:865)以及865nm处的气溶胶光学厚度τ_a；类CZCS色素、叶绿素a（chlor_a）、K_490及chlor_a_K_490数据。上述各参数的存储值为对应分箱像素值的自然对数之和，以及对应分箱像素值自然对数的平方之和。其中，归一化离水辐亮度、各波段气溶胶辐亮度、ε以及865nm处的τ_a数据存储于一个附属文件中。
除ε和τ_865外，其余物理量的单位均为"mW·cm⁻²·mm⁻¹·sr⁻¹"。类CZCS色素浓度数据（CZCS_pigment）的单位为"mg·m⁻³"。叶绿素a（chlor_a）浓度数据的单位为"mg·m⁻³"。K_490为490nm处的漫衰减系数，单位为"m⁻¹"。Chlor_a_K_490为积分叶绿素，通过L2级数据中的叶绿素a值除以K(490)计算得到，单位为"mg·m⁻²"。本数据集采用HDF4格式存储。