欧空局土壤湿度气候变化倡议(Soil_Moisture_cci)1978-2020年土壤湿度的实验性调整组合产品v06.1

欧空局土壤水分气候变化倡议(soil_moisture_cci)项目首次通过其v06.1版本的数据发布生成了一个实验性的断裂调整土壤水分产品。该产品试图通过匹配合并期之间数据集的统计数据来减少最终cci产品中的断裂。在v06.1，断裂调整过程(在Preimesberger等人2020中解释)仅适用于组合产品，使用ERA5土壤水分作为参考。土壤水分cci组合数据集是欧洲航天局土壤水分基本气候变量(ECV)气候变化倡议项目创建的三个数据集之一。”该产品是通过直接合并AMI-WS、ASCAT、SMMR、SSM/I、TMI、AMSR-E、WindSat、AMSR2、SMOS、SMAP、FY-3B和GPM卫星仪器的2级散射计和辐射计土壤水分产品而创建的。还创建了被动和主动产品。
v06.1组合间断调整产品以NetCDF-4经典文件格式作为全球每日图像提供，以0.25度的空间分辨率呈现地表土壤湿度的全球覆盖范围。它以体积单位[m3 m-3]提供，涵盖1978-11-01年至2020-12-31年期间(yyyy-mm-dd)。有关该产品的理论和算法基础的信息，请参阅算法理论基线文件和Preimesberger等人2020。与数据集相关的其他参考文件和信息也可以在CCI土壤水分项目网站上找到。
应使用以下所有参考文献引用数据集：1。Gruber，A.、Scanlon，T.、van der Schalie，R.、Wagner，W.和Dorigo，W.(2019)。欧空局CCI土壤水分气候数据记录的演变及其基本合并方法，地球系统。Sci。数据，11717-739，https://doi.org/10.5194/essd-11-717-20192.Dorigo，W.A.，Wagner，W.，Albergel，C.，Albrecht，F.，Balsamo，G.，Brocca，L.，Chung，D.，Ertl，M.，Forkel，M.，Gruber，A.，Haas，E.，Hamer，D.P.Hirschi，M.，Ikonen，J.，De Jeu，R.Kidd，R.Lahoz，W.，Liu，Y.Y.，Miralles，D.，Lecomte，P.(2017)。欧空局CCI土壤湿度促进对地球系统的理解：最新技术和未来方向。环境遥感，2017，ISSN 0034-4257，https://doi.org/10.1016/j.rse.2017.07.0013.Preimesberger，W.、Scanlon，T.、Su，C.-H.、Gruber，A.和Dorigo，W.，“全球欧空局CCI土壤水分多卫星气候数据记录中结构断裂的均匀化”，载于《IEEE地球科学与遥感学报》，第59卷，第4期，第2845-2862页，2021年4月，doi:10.109/TGRS.20203012896。

The European Space Agency (ESA) Climate Change Initiative (CCI) for Soil Moisture (soil_moisture_cci) project generated an experimental break-adjusted soil moisture product for the first time via its v06.1 data release. This product aims to reduce discontinuities in the final CCI product by matching the statistical characteristics of datasets across merge periods. For v06.1, the break-adjustment process (explained in Preimesberger et al. 2020) was only applied to the combined product, using ERA5 soil moisture as the reference.

The soil moisture CCI combined dataset is one of three datasets created by the ESA Climate Change Initiative for Soil Moisture Essential Climate Variable (ECV). This product is developed by directly merging Level-2 scatterometer and radiometer soil moisture products from satellite instruments including AMI-WS, ASCAT, SMMR, SSM/I, TMI, AMSR-E, WindSat, AMSR2, SMOS, SMAP, FY-3B, and GPM. Passive and active products were also created.

The v06.1 combined break-adjusted product is provided as global daily imagery in NetCDF-4 Classic file format, with a spatial resolution of 0.25° and global coverage of surface soil moisture. It is provided in volumetric units [m³ m⁻³] and covers the period from 1978-11-01 to 2020-12-31 (yyyy-mm-dd). For information on the theoretical and algorithmic foundations of this product, please refer to the Algorithm Theoretical Basis Document and Preimesberger et al. 2020. Additional reference materials and information related to the dataset are also available on the CCI Soil Moisture project website.

All of the following references should be used when citing this dataset:
1. Gruber, A., Scanlon, T., van der Schalie, R., Wagner, W. & Dorigo, W. (2019). Evolution of the ESA CCI Soil Moisture Climate Data Record and its fundamental merging approach. Earth System Science Data, 11, 717–739. https://doi.org/10.5194/essd-11-717-2019
2. Dorigo, W. A., Wagner, W., Albergel, C., Albrecht, F., Balsamo, G., Brocca, L., Chung, D., Ertl, M., Forkel, M., Gruber, A., Haas, E., Hamer, D. P., Hirschi, M., Ikonen, J., De Jeu, R., Kidd, R., Lahoz, W., Liu, Y. Y., Miralles, D. & Lecomte, P. (2017). ESA CCI Soil Moisture for improving Earth system understanding: current status and future directions. Remote Sensing of Environment, 2017, ISSN 0034-4257. https://doi.org/10.1016/j.rse.2017.07.001
3. Preimesberger, W., Scanlon, T., Su, C.-H., Gruber, A. & Dorigo, W. (2021). Homogenization of structural discontinuities in the global ESA CCI soil moisture multi-satellite climate data record. IEEE Transactions on Geoscience and Remote Sensing, 59(4), 2845–2862. https://doi.org/10.1109/TGRS.2020.3012896