Assessment of the Number of Valid Observations and Diurnal Changes in Chl-a for GOCI: Highlights for Geostationary Ocean Color Missions

Zhao, Dan1,2; Feng, Lian1,2

2020-06

10.3390/s20123377

SENSORS   影响因子和分区

1424-8220

1424-8220

The first geostationary ocean color satellite mission (geostationary ocean color imager, or GOCI) has provided eight hourly observations per day over the western Pacific region since June 2010. GOCI imagery has been widely used to track the short-term dynamics of coastal and inland waters. Few studies have been performed to comprehensively assess the advantages of GOCI images in obtaining valid observations and estimating diurnal changes within the water column. Using the entire mission dataset between 2011 and 2017, these knowledge gaps were filled by comparing the daily percentages of valid observations (DPVOs) between GOCI and MODIS Aqua (MODISA) and by examining the diurnal changes in Chl-a over the East China Sea. The mean DPVOs of GOCI was 152.6% over the clear open ocean, suggesting that a daily valid coverage could be expected with GOCI. The GOCI DPVOs were similar to 26 times greater than the MODISA DPVOs; this pronounced difference was caused by the combined effects of their different observational frequencies and the more conservative quality flag system for MODISA. Diurnal changes in the GOCI-derived Chl-a were also found, with generally higher Chl-a in the afternoon than the morning and pronounced heterogeneities in the temporal and spatial domains. However, whether such diurnal changes are due to the real dynamics of the oceanic waters or artifacts of the satellite retrievals remains to be determined. This study provides the first comprehensive quantification of the unparalleled advantages of geostationary ocean color missions over polar orbiters, and the results highlights the importance of geostationary ocean color missions in studying coastal and inland waters.

GOCI SUSPENDED PARTICULATE MATTER geostationary HARMFUL ALGAL BLOOM ocean color ATMOSPHERIC CORRECTION MODISA SATELLITE DATA Chl-a SEA DPVOs CHINA diurnal changes PHYTOPLANKTON PRODUCTS COASTAL VARIABILITY

SCI ; EI

英语

第一 ; 通讯

National KeyR&Dprogram of China[2016YFC0402806] ; National Natural Science Foundation of China[41971304][41671338][41890852][41890851] ; Guangdong provincial key laboratory of soil and groundwater pollution control[2017B030301012] ; High-level Special Funding of the Southern University of Science and Technology[G02296302][G02296402]

Chemistry ; Engineering ; Instruments & Instrumentation

Chemistry, Analytical ; Engineering, Electrical & Electronic ; Instruments & Instrumentation

WOS:000553902600001

MDPI

20202508849927

Color ; Orbits ; Oceanography

Oceanography, General:471.1 ; Satellites:655.2 ; Light/Optics:741.1

CHEMISTRY

Web of Science

1.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen 518055, Peoples R China;
2.Southern Univ Sci & Technol, Shenzhen Municipal Engn Lab Environm IoT Technol, Shenzhen 518055, Peoples R China

Zhao, Dan,Feng, Lian. Assessment of the Number of Valid Observations and Diurnal Changes in Chl-a for GOCI: Highlights for Geostationary Ocean Color Missions[J]. SENSORS,2020,20(12):1-21.

Zhao, Dan,&Feng, Lian.(2020).Assessment of the Number of Valid Observations and Diurnal Changes in Chl-a for GOCI: Highlights for Geostationary Ocean Color Missions.SENSORS,20(12),1-21.

Zhao, Dan,et al."Assessment of the Number of Valid Observations and Diurnal Changes in Chl-a for GOCI: Highlights for Geostationary Ocean Color Missions".SENSORS 20.12(2020):1-21.