Accuracy Assessment of Sea Surface Temperature from NOAA/AVHRR Data in the Seas around Korea and Error Characteristics

Park, Kyung-Ae; Lee, Eun-Young; Chung, Sung-Rae; Sohn, Eun-Ha

doi:10.7780/kjrs.2011.27.6.663

Cited by 17 publications

(7 citation statements)

References 21 publications

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“…White sharks have been documented in water temperatures from 3–27°C [13] – [15] , [40] , [52] , [53] ; but typically spend most of their time in a narrow range of water temperatures, from 16.4–24.7°C [47] , [54] – [57] . As the SST off Japan encompasses these temperature ranges [58] , [59] , it is possible that sharks move along the Japanese coastline concurrent with the seasonal change in SST. Alternatively, white sharks may inhabit these temperatures due to prey availability [57] .…”

Section: Discussionmentioning

confidence: 99%

The Last Frontier: Catch Records of White Sharks (Carcharodon carcharias) in the Northwest Pacific Ocean

Christiansen

Lin²,

Tanaka

et al. 2014

PLoS ONE

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White sharks are highly migratory apex predators, globally distributed in temperate, sub-tropical, and tropical waters. Knowledge of white shark biology and ecology has increased recently based on research at known aggregation sites in the Indian, Atlantic, and Northeast Pacific Oceans; however, few data are available for the Northwest Pacific Ocean. This study provides a meta-analysis of 240 observations of white sharks from the Northwest Pacific Ocean between 1951 and 2012. Records comprise reports of bycatch in commercial fisheries, media accounts, personal communications, and documentation of shark-human interactions from Russia (n = 8), Republic of Korea (22), Japan (129), China (32), Taiwan (45), Philippines (1) and Vietnam (3). Observations occurred in all months, excluding October-January in the north (Russia and Republic of Korea) and July-August in the south (China, Taiwan, Philippines, and Vietnam). Population trend analysis indicated that the relative abundance of white sharks in the region has remained relatively stable, but parameterization of a 75% increase in observer effort found evidence of a minor decline since 2002. Reliably measured sharks ranged from 126–602 cm total length (TL) and 16–2530 kg total weight. The largest shark in this study (602 cm TL) represents the largest measured shark on record worldwide. For all countries combined the sex ratio was non-significantly biased towards females (1∶1.1; n = 113). Of 60 females examined, 11 were confirmed pregnant ranging from the beginning stages of pregnancy (egg cases) to near term (140 cm TL embryos). On average, 6.0±2.2 embryos were found per litter (maximum of 10) and gestation period was estimated to be 20 months. These observations confirm that white sharks are present in the Northwest Pacific Ocean year-round. While acknowledging the difficulties of studying little known populations of a naturally low abundance species, these results highlight the need for dedicated research to inform regional conservation and management planning.

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Section: Discussionmentioning

confidence: 99%

The Last Frontier: Catch Records of White Sharks (Carcharodon carcharias) in the Northwest Pacific Ocean

Christiansen

Lin²,

Tanaka

et al. 2014

PLoS ONE

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“…The accuracy of satellite-derived SST for NOAA satellites in the study area has been reported to be less than 1°C: for instance 0.91°C (Park et al 1994), 0.7-0.8°C (Park et al 1999), 0.75-1.0°C (Park et al 2011), 0.56-0.89°C Kawamura 2008a, 2008b), and 0.6°C Kawamura 1992a, 1992b). Seasonal biases as overestimation (underestimation) of SST in summer (winter) were eliminated using a regionally optimized algorithm (Park et al 1999).…”

Section: Data and Processingmentioning

confidence: 92%

Semi-annual cycle of sea-surface temperature in the East/Japan Sea and cooling process

Park

Lee

2014

International Journal of Remote Sensing

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Semi-annual cycles of the sea-surface temperature (SST) in the East/Japan Sea (EJS) and their forcings were examined by analysing National Oceanic and Atmospheric Administration/Advanced Very-High-Resolution Radiometer data, scatterometer wind vectors, and heat flux data. The semi-annual cycle contributed to the total variance of the SST by 8% and amounted to 25% of the amplitudes of the annual SST cycle, particularly in the Tatarskiy Strait and along the continental shelf off Russia. The lowest phase, corresponding to the minimum SST, occurred during early November and 6 months earlier in May or June depending on the position. The forcings of the semi-annual cycle were not semi-annual but substantially annual with a lag of 6 months, which gave rise to SST cooling in spring and autumn. Our analyses illustrated that SST cooling in autumn was caused by direct, local atmospheric wind forcings, whereas the cooling with large amplitudes of the semi-annual cycle in spring was caused by the non-local, remotely forced cold water advection of the Liman Current associated with sea-ice melting in the Tatarskiy Strait. The phase lag of 1-2 months between the complete melting of the sea ice in the Tatarskiy Strait and the surface cooling along the Russian continental shelf was related to the advection of cold water from sea ice in the form of the Liman Cold Current. The semi-annual cycle also resulted from asymmetry of the time series of the SST due to a long cold winter and a short warm summer. To understand how SST curves are distorted and asymmetric, we suggested two mathematical parameters of kurtosis and skewness. In addition, we suggest that the ratio of the semiannual amplitude to the annual amplitude of SST harmonics can be used as a typical indicator of the asymmetry in year-to-year SST variations.

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“…Park et al, 2008;Park et al, 2011). In contrast to SST, satellite SWH has not been given much attention in so far as its real-time use or diverse applications.…”

Section: Discussionmentioning

confidence: 99%

Validation of Significant Wave Height from Satellite Altimeter in the Seas around Korea and Error Characteristics

Park¹,

Woo²,

Lee³

et al. 2013

Korean Journal of Remote Sensing

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Oceanic surface waves are generated by winds blowing over the oceanic surface of which the strength depends on how strong, how long, and how far the winds blow (Kinsman, 1965;Knauss, 1996). Since the waves can travel far from their origin of propagation to over thousands of kilometers as swell, they can have remarkable influences on non-local remote coastal regions. Therefore, the waves at local coastal stations Abstract : Significant Wave Height (SWH) data measured by satellite altimeters (Topex/Poseidon, Jason-1, Envisat, and Jason-2) were validated in the seas around Korea by comparison with wave height measurements from marine meteorological buoy stations of Korea Meteorological Administration (KMA). A total of 1,070 collocation matchups between Ku-band satellite altimeter data and buoy data were obtained for the periods of the four satellites from 1992 to the present. In the case of C-band and S-band observations, 1,086 matchups were obtained and used to assess the accuracy of satellite SWH. Root-Mean-Square (RMS) errors of satellite SWH measured with Ku-band were evaluated to roughly 0.2 _ 2.1 m. Comparisons of the RMS errors and bias errors between different frequency bands revealed that SWH observed with Ku-band was much more accurate than other frequencies, such as C-band or S-band. The differences between satellite SWH and buoy wave height, satellite minus buoy, revealed some dependence on the magnitude of the wave height. Satellite SWH tended to be overestimated at a range of low wave height of less than 1 m, and underestimated for high wave height of greater than 2 m. Such regional characteristics imply that satellite SWH should be carefully used when employed for diverse purposes such as validating wave model results or data assimilation procedures. Thus, this study confirmed that satellite SWH products should be continuously validated for regional applications.Key Words : significant wave height, satellite altimeter, Ku-band, validation Korean Journal of Remote Sensing, Vol.29, No.6, 2013, pp.631~644 http://dx.doi.org/10.7780/kjrs.2013 -6 31 -

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Accuracy Assessment of Sea Surface Temperature from NOAA/AVHRR Data in the Seas around Korea and Error Characteristics

Cited by 17 publications

References 21 publications

The Last Frontier: Catch Records of White Sharks (Carcharodon carcharias) in the Northwest Pacific Ocean

The Last Frontier: Catch Records of White Sharks (Carcharodon carcharias) in the Northwest Pacific Ocean

Semi-annual cycle of sea-surface temperature in the East/Japan Sea and cooling process

Validation of Significant Wave Height from Satellite Altimeter in the Seas around Korea and Error Characteristics

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