The Accuracies of Himawari-8 and MTSAT-2 Sea-Surface Temperatures in the Tropical Western Pacific Ocean

Ditri, A. L.; Minnett, Peter J.; Liu, Yang; Kilpatrick, K. A.; Kumar, Ajoy

doi:10.3390/rs10020212

Cited by 18 publications

(20 citation statements)

References 64 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Himawari‐8 SST data were compared with subsurface in situ temperature measurements from the Tropical Atmosphere Ocean array. Ditri et al (2018) suggested that Himawari‐8 provided more accurate SST measurements compared to those from previous missions (MTSAT‐2) in the tropical western Pacific Ocean. The Himawari‐8 data showed a mean SST difference of 0.18 K for all moored buoys and temperature logger stations, while the MTSAT‐2 data showed a mean difference of 0.26 K.…”

Section: Methodsmentioning

confidence: 98%

Tide‐Induced Periodic Sea Surface Temperature Drops in the Coral Reef Area of Nanwan Bay, Southern Taiwan

et al. 2020

View full text Add to dashboard Cite

Tidal current-induced cyclonic eddies cause cold-water upwelling and periodic sea surface temperature (SST) drops around the coral reef area in Nanwan Bay, which is located at the southern tip of Taiwan. This study used Himawari-8 satellite data and tide gauge and coastal ocean dynamics application radar (CODAR) data to analyze the characteristics of the SST drops and cyclonic eddy propagation and used an oceanic general circulation model (OGCM) to simulate the tidal current flowing process. According to the CODAR data analysis, the mixed primary semidiurnal tide had an average current velocity of 0.3-0.4 m s −1 throughout the bay, and the average life cycle of a cyclonic eddy is 6.6 hr, with a propagation speed of 0.35 m s −1 . The SST drop during the spring tide period was greater than that during the neap tide period, and the SST dropped in both summer and winter. The average daily SST drop in the summer reached 2°C with a maximum observed value of 4.7°C, and the SST drop rate was 0.3-0.5°C hr −1 . The annual mean chlorophyll-a concentration was 0.25 mg m −3 . This study explored the special properties of the Nanwan Bay coral reef area from the perspective of ocean physics to allow ecologists to facilitate the implementation of long-term conservation and monitoring programs.Plain Language Summary In recent years, the increased global sea temperatures have caused severe coral bleaching; however, Nanwan Bay has suffered a comparatively smaller impact. To understand why, we analyzed satellite and radar data. We found that Nanwan Bay experienced an almost daily sea surface temperature (SST) drop during the summer and that this periodic variation was caused by a cyclonic eddy upwelling cold water to the surface. In the summer, the SST drop was 2°C on average and dropped at a rate of 0.3-0.5°C hr −1 . The observational record indicated that the water cooled as much as 4.7°C in 1 day. These eddies were caused by the unique topography in this area of the bay; they survived an average of 6.6 hr and moved at a rate of 0.35 m s −1 . The formed eddies disappeared in the bay or flowed southward out of the bay. With this study, we hope to help marine ecologists understand the Nanwan Bay environment from a geophysical perspective so that they have sufficient background knowledge when investigating coral biology and coral reef ecology in the future.

show abstract

Section: Methodsmentioning

confidence: 98%

Tide‐Induced Periodic Sea Surface Temperature Drops in the Coral Reef Area of Nanwan Bay, Southern Taiwan

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The SST data (2 km spatial resolution) and Chl-a (5 km spatial resolution) are available from 7 July 2015, with a 1-h temporal resolution. The Himawari-8 data have good accuracy and have been applied to calculate short-term sea surface currents [17,20].…”

Section: Sea Surface Temperature and Chlorophyll-a Concentrationmentioning

confidence: 99%

“…The SST algorithm is based on the method developed for Himawari-8 SST [30]. SGLI SSTs were validated by the comparison with buoy data with 0.8 K difference, the Himawari-8 had an average SST difference of 0.18 K with a tropical atmosphere-ocean array [20]. The Chl-a concentration algorithm is developed based on the empirical algorithms for convenient use with the other sensor products, the estimated errors are −60 to +150% with in-situ data and MODIS data (https://suzaku.eorc.jaxa.jp/GCOM_C/).…”

Section: Uncertainties Errors and Accuraciesmentioning

confidence: 99%

Temporal Variation and Spatial Structure of the Kuroshio-Induced Submesoscale Island Vortices Observed from GCOM-C and Himawari-8 Data

Hsu

Lee

et al. 2020

Remote Sensing

View full text Add to dashboard Cite

Dynamics of ocean current-induced island wake has been an important issue in global oceanography. Green Island, a small island located off southeast of Taiwan on the Kuroshio path was selected as the study area to more understand the spatial structure and temporal variation of well-organized vortices formed by the interaction between the Kuroshio and the island. Sea surface temperature (SST) and chlorophyll-a (Chl-a) concentration data derived from the Himawari-8 satellite and the second generation global imager (SGLI) of global change observation mission (GCOM-C) were used in this study. The spatial SST and Chl-a variations in designed observation lines and the cooling zone transitions on the left and right sides of the vortices were investigated using 250 m spatial resolution GCOM-C data. The Massachusetts Institute of Technology general circulation model (MITgcm) simulation confirmed that the positive and negative vortices were sequentially detached from each other in a few hours. In addition, totals of 101 vortexes from July 2015 to December 2019 were calculated from the 1-h temporal resolution Himawari-8 imagery. The average vortex propagation speed was 0.95 m/s. Totals of 38 cases of two continuous vortices suggested that the average vortex shedding period is 14.8 h with 1.15 m/s of the average incoming surface current speed of Green Island, and the results agreed to the ideal Strouhal-Reynolds number fitting curve relation. Combined with the satellite observation and numerical model simulation, this study demonstrates the structure of the wake area could change quickly, and the water may mix in different vorticity states for each observation station.

show abstract

“…The Multi-Functional Transport SATellite (MTSAT) series had two satellites MTSAT-1R (Himawari-6) and MTSAT-2 (Himawari-7), which were in operation from 2005 to 2010 and 2010 to 2015 [2]. The SST from the MTSAT-2 imager showed a bias of 0.26 K and a standard deviation of 0.48 K compared with subsurface in situ temperature measurements in the Tropical Western Pacific Ocean from August to October 2015 [4]. structure and wake characteristics, the ISAR is mounted on the port bridge wing, approximately 19 meters above the summer load line, with sky and sea view angles of 25 • and 155 • from nadir [13].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Himawari-8 AHI SST with Shipboard Skin SST Measurements in the Australian Region

et al. 2020

View full text Add to dashboard Cite

Sea surface temperature (SST) measurements from the geostationary satellite Himawari-8 Advanced Himawari Imager (AHI) are compared with in situ skin SSTs derived from shipboard Infrared SST Autonomous Radiometers (ISAR) in the Australian region. The mean bias and standard deviation of the differences between Himawari-8 AHI and ISAR skin SST of best quality are 0.09 K and 0.30 K, with total matchups numbering 2701. Shipboard bulk SST measurements at depths between around 7.1 and 9.9 meters are compared with the matchups in a case study. Analyses show significant differences between skin and bulk SST measurements of maximum value 2.23 K under conditions of high diurnal warming. The results also demonstrate that Himawari-8 AHI skin SST with high temporal resolution has the ability to accurately measure diurnal warming events.

show abstract

The Accuracies of Himawari-8 and MTSAT-2 Sea-Surface Temperatures in the Tropical Western Pacific Ocean

Cited by 18 publications

References 64 publications

Tide‐Induced Periodic Sea Surface Temperature Drops in the Coral Reef Area of Nanwan Bay, Southern Taiwan

Tide‐Induced Periodic Sea Surface Temperature Drops in the Coral Reef Area of Nanwan Bay, Southern Taiwan

Temporal Variation and Spatial Structure of the Kuroshio-Induced Submesoscale Island Vortices Observed from GCOM-C and Himawari-8 Data

Comparison of Himawari-8 AHI SST with Shipboard Skin SST Measurements in the Australian Region

Contact Info

Product

Resources

About