Update on Chinese ocean color missions

State Key Laboratory of Satellite Ocean Environment Dynamics (SOED)

Xianqiang He, Delu Pan, Yan Bai

HY-1C mission

Launched on Sept. 7, 2018;

Successor of HY-1A (2002-2004) and HY-1B (2007-2016).

Sensor Bands Resolution SwathCOCTS(Chinese Ocean Color and Temperature Scanner

10 bands(8 bands from 412nm-865nm;2 TIR bands)

1.1km ~3000km

CZI(Coastal Zone Imager)

4 bands(460nm,560nm,650nm,825nm)

50m ~1000km

UVI(Ultra Violet Imager)

2 bands(355nm, 385nm)

550m ~3000km

HY1C/COCTS

Aqua/MODIS

HY1C/COCTS vs. Aqua/MODIS daily chla (2018.9.18)

2019.1.1 2019.1.1

2019.1.1 2019.1.1

HY1C/COCTS vs. Aqua/MODIS 8-days composited chla(2018.10.24-31)

HY1C/COCTS vs. Aqua/MODIS 8-days composited SST (2018.10.24-31)

COCTS vs. MODIS chla

HY1C/COCTS vs. Aqua/MODIS and SNPP/VIIRS8-days composited Chla, SST (2018.10.24-31)

COCTS vs. VIIRS chla

COCTS vs. MODIS SST COCTS vs. VIIRS SST

HY1C/COCTS vs. Aqua/MODIS 8-days composited Lwn(2018.10.24-31)

HY1C/COCTS vs. Aqua/MODIS 8-days composited Lwn (2018.10.24-31)

412nm 443nm

490nm 520nm

565nm 670nm

HY1C/COCTS vs. Aqua/MODIS and SNPP/VIIRSmonthly Chla, SST (2018.10)

Chinese ocean satellite missions (2015~2025)

HY-1E&HY-1F New generation polar-orbit OC satellites. 3 main payloads: New Ocean Color and Temperature Scanner (500m resolution, 18 bands

from 350nm-12000nm); Programmable Moderate Resolution Imaging Spectroradiometer (500m

resolution, 16 bands from 375-2350nm); Coastal Zone Imager (20m resolution, 9 bands from 400-800nm). To be launched in 2021

Summary

HY-1C has been launched in 2018 with global

observation capacity;

HY-1D,HY-1E/1F will be launched before 2021; Geo

OC satellite will be launched in 2022.

Thanks！

Band Wavelength (µm) Typical radiance（mW/cm2µmsr）

SNR

1 0.402～0.422 9.10 3492 0.433～0.453 8.41 4723 0.480～0.500 6.56 4674 0.510～0.530 5.46 4485 0.555～0.575 4.57 4176 0.660～0.680 2.46 3097 0.730～0.770 1.61 2008 0.845～0.885 1.09 3279 10.30～11.40 0.2K(300K, NEΔT)10 11.40～12.50 0.2K(300K, NEΔT)

Chinese ocean color and temperature scanner (COCTS)

Coastal Zone Imager(CZI)Band Wavelength (µm) Typical radiance

（mW/cm2µmsr）SNR

1 0.42-0.50 8.41 4102 0.52-0.60 4.57 3003 0.61-0.69 2.46 2484 0.76-0.89 1.09 240

Ultra Violet Imager (UVI)Band Wavelength (µm) Typical radiance

（mW/cm2µmsr）SNR

1 0.345-0.365 7.5 10002 0.375-0.395 6.1 1000