Evaluation of retrieving chlorophyll a concentration and colored dissolved organic matter absorption from satellite ocean color remote sensing in the coastal waters of Hokkaido, Japan

Isada, Tomonori; Hooker, Stanford B.; Taniuchi, Yukiko; Suzuki, Koji

doi:10.1007/s10872-022-00633-w

Cited by 7 publications

(3 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Among the satellite-based sensors, the Secondgeneration Global Imager (SGLI) is a multi-wavelength optical radiometer system mounted on the Global Change Observation Mission-Climate "SHIKISAI" (GCOM-C) (Yoshida et al, 2021). The SGLI can obtain ocean color data with a spatial resolution of up to 250 m, and its standard algorithm provides good retrieval of CHL data from coastal to open areas (Isada et al, 2022;Matsuoka et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

“…Among the satellite‐based sensors, the Second‐generation Global Imager (SGLI) is a multi‐wavelength optical radiometer system mounted on the Global Change Observation Mission—Climate “SHIKISAI” (GCOM‐C) (Yoshida et al, 2021). The SGLI can obtain ocean color data with a spatial resolution of up to 250 m, and its standard algorithm provides good retrieval of CHL data from coastal to open areas (Isada et al, 2022; Matsuoka et al, 2022). Such high spatial resolution makes it possible to reveal the environment in coastal waters with high spatial heterogeneity owing to the complex topography and effects of the surrounding land and rivers.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mesoscale mosaics of interannual variations in surface temperature, chlorophyll a concentration, and their relation in a coastal fishing ground

Sato,

Tsubono,

Yamaguchi

et al. 2024

Fisheries Oceanography

View full text Add to dashboard Cite

To test the potential of high‐resolution satellite image analysis for assessing and predicting the mesoscale (<10 km in this study) effects of climate and environmental change on temperature and primary productivity in fishing grounds, we conducted satellite image analysis around an island in a coastal strait west of Japan from 2018 to 2023. We observed a distinct north–south gradient in sea surface temperature (SST) and chlorophyll a concentration (CHL) over approximately 20 km of the transect, which was likely affected by the current system. The model configuration suggests that the frequency of southward currents during winter–spring can control the magnitude of spring phytoplankton blooms. In the study region, an increase in SST at a rate of 0.06–0.13°C y−1 occurred during the study period, accompanied by a decrease in CHL. The north–south gradient in the rate of change suggests that the variation in the temperature and flow rate of the Kuroshio Current into the study area was due to these abrupt changes. The relationship between the annual mean SST and CHL was also spatially heterogeneous, showing a higher sensitivity of CHL to SST in the southwest of the island than in the north. In addition to the intrusion of warm and oligotrophic Kuroshio waters, the spread of less saline and more eutrophic coastal waters likely influenced this spatial heterogeneity. The satellite image analysis in the present study successfully revealed mesoscale mosaics of environmental conditions in coastal fishery grounds.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mesoscale mosaics of interannual variations in surface temperature, chlorophyll a concentration, and their relation in a coastal fishing ground

Sato,

Tsubono,

Yamaguchi

et al. 2024

Fisheries Oceanography

View full text Add to dashboard Cite

show abstract

“…Nonetheless, small rivers play important roles in supporting local productivity and the marine environment as sources of nutrients and pollutants, among other materials (Bauer et al., 2013; Izett & Fennel, 2018). Since satellites such as Landsat 8 and Sentinel 2 began to provide near‐coast data at high spatial resolutions, interest in the behavior of small rivers has grown (Isada et al., 2022; Pahlevan et al., 2020). When multiple rivers are located near each other, a low‐salinity barrier can form along the coastline over a long distance (Carmack et al., 2015).…”

Section: Introductionmentioning

confidence: 99%

Impact of a Large Shallow Semi‐Enclosed Lagoon on Freshwater Exchange Across an Inlet Channel

Kida,

Tanaka,

Isada

et al. 2023

JGR Oceans

Self Cite

View full text Add to dashboard Cite

The impact of a large shallow semi‐enclosed lagoon on freshwater exchange across an inlet channel is investigated using an idealized numerical model. Lagoons are often found between a river mouth and the ocean; we focus on those where the river discharge rate is small and the inlet channel is narrower and deeper than the lagoon. Tides generate freshwater and oceanic‐water plumes across the channel; a stratified freshwater plume forms in the ocean from the late ebb to early flood phase, while a vertically well‐mixed oceanic‐water plume forms in the lagoon from the late flood to early ebb phase. The shallow depth of the lagoon increases the flow speed of the oceanic‐water plume, which results in the formation of a sharp and vertically well‐mixed salinity front within the lagoon. When this front moves toward the ocean during the ebb phase, vertical mixing increases where the bathymetry deepens and freshwater encounters oceanic water below. Without a dredged bottom slope, the impact of mixing would be greatly reduced within the shallow lagoon and channel, as the shallow depth would limit the subsurface intrusion of oceanic water. The narrow channel further causes the flow to converge and accelerate, enhancing both internal shear‐driven and bottom boundary‐layer mixing at the channel and increasing freshwater plume thickness where it enters the ocean. Sensitivity experiments showed that the role of tidal pumping in freshwater exchange across the channel increases when the lagoon area and tidal mixing increase and when the estuarine Richardson number decreases.

show abstract

Use of AERONET-OC for validation of SGLI/GCOM-C products in Ariake Sea, Japan

et al. 2022

View full text Add to dashboard Cite

A station of AErosol RObotic NETwork Ocean Color (AERONET-OC) has been set on the Ariake Observation Tower of Saga University on April, 2018, for verification of the Second generation Global Imager (SGLI)/Global Change Observation Mission-Climate (GCOM-C). Remote sensing reflectance (Rrs) observed by the AERONET-OC was used for verification of SGLI. SGLI Version 1 data underestimated the shortwave Rrs and Rrs (380) and Rrs(412) were mostly negative, while the estimation was improved by Version 2 with the correction of Rrs(412) to be positive. It was indicated that absorptive aerosol was influenced to SGLI atmospheric correction and caused the underestimation of Rrs. Simple linear correction method to improve shortwave Rrs also worked well for specifically Version 1 data. Water constituents, chlorophyll-a (Chl-a), total suspended matter (TSM) and colored dissolved organic matter (CDOM) of the SGLI were also verified by the ship observation data. All constituents were improved from Version 1 to 2 with the correction of Rrs, although Version 2 underestimated Chl-a and CDOM. Simple regression algorithms were also examined with in situ as well as SGLI Rrs data, and it indicated that more sophisticated algorithms may be required. Time series of water constituents derived from AERONET-OC and SGLI data were compared to river discharge and spring–neap tidal cycle. The results indicated that the behavior, such as the increase of Chl-a after river discharge and interaction of Chl-a and TSM with the spring–neap tidal cycles were observed, although estimations of water constituents were not completely separated by the algorithms.

show abstract

Evaluation of retrieving chlorophyll a concentration and colored dissolved organic matter absorption from satellite ocean color remote sensing in the coastal waters of Hokkaido, Japan

Cited by 7 publications

References 57 publications

Mesoscale mosaics of interannual variations in surface temperature, chlorophyll a concentration, and their relation in a coastal fishing ground

Mesoscale mosaics of interannual variations in surface temperature, chlorophyll a concentration, and their relation in a coastal fishing ground

Impact of a Large Shallow Semi‐Enclosed Lagoon on Freshwater Exchange Across an Inlet Channel

Use of AERONET-OC for validation of SGLI/GCOM-C products in Ariake Sea, Japan

Contact Info

Product

Resources

About