数据说明
HY-1B Secchi Disk Depth (SDD)
上传时间:2019-05-22 14:18:20 浏览次数:作者与来源:admin
It is the product of the Secchi Disk depth (or water transparency) retrieved by HY-1B/COCTS.
Unit: m
Resolution:  1.6km
Duration: 2007-2016
Source: HY-1B/COCS L1B data from the Hangzhou ocean satellite data receiving ground station.
Version: 2018
Dataset Name: SIO_HY1B_COCTS_yyyy-MM-dd-HH-mm-ss_L3A_NODEF_1KM_SSD_HE2018
Processing:
Based on the satellite-derived Chl and TSM, the water transparency (alias Secchi disk depth, SDD) is retrieved using the semi-analytic algorithm (He et al., 2004a;2004b;2017) as
Zd=1/4(a+bb)ln[ρpαβ(a+bb)/Cefbb]
where a and bb are the absorption and backscattering coefficients, which are the functions of the Chl and SPM. For case-I water, a and bb can be estimated by Chl as
a(λ)=(aw(λ)+0.06A(λ)Chl0.65)[1+0.2e-0.014(λ-440)]
bb(λ)=bbw(λ)+(0.3Chl0.62-bw(550)){0.002+0.02[0.2-0.25log(Chl)]550/λ}
For the case-II water, the absorption and backscattering by the TSM should be added as
a_TSM(λ)=TSM×(0.0205+0.038e-0.0055(λ-440))
bbp_TSM(λ)=0.019×TSM×[0.28-0.000167(λ-400)]
Known Issues:
Due to no orbit calibration instrument onboard the HY-1B satellite, there may have calibration issue on the HY-1B/COTS L1B data, which will propagate to the derived SDD product.
Reference
Xianqiang He, Delu pan, Zhihua Mao, Qiankun Zhu.The study on the inversing model of water transparency using the SeaWiFS data. ACTA OCEANOLOGICA SINICA, 2014,26(5):55-62. (In Chinese with English abstract).
Xianqiang He*, Delu Pan, Yan Bai, Tianyu Wang, Chen-Tung Arthur Chen, Qiankun Zhu, Zengzhou Hao, Fang Gong. Recent changes of global ocean transparency observed by SeaWiFS. Continental Shelf Research, ,2016, 143, 159-166. DOI: 10.1016/j.csr.2016.09.011
Xianqiang He*, Yan Bai, Chen-Tung Authur Chen, Yi-Chia Hsin, Chau-Ron Wu, Weidong Zhai, Zhiliang Liu, Fang Gong. Satellite views of the episodic terrestrial material transport to the southern Okinawa Trough driven by typhoon. Journal of Geophysical Research - C: Oceans, 2014,119:4490-4504.
DOI: 10.1002/2014JC009872
Acknowledgment
Please cite the above references if this dataset is used. Moreover, the satellite ground station and the satellite data processing & sharing center of the SOED/SIO should be acknowledged.