Correction of TOPEX/POSEIDON altimeter data for nonisostatic sea level response to atmospheric pressure in the Japan/East Sea

Nam, SungHyun; Lyu, Sang Jin; Kim, Young Ho; Kim, Kuh; Park, Jaehun; Watts, D. Randolph

doi:10.1029/2003gl018487

Cited by 24 publications

(25 citation statements)

References 13 publications

(20 reference statements)

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“…Some of the similar characteristics include the larger d variability at mid-and high latitudes, the breakdown of the IB assumption at longer periods at low latitudes (Ponte and Gaspar 1999), and the tendency for a stronger dynamic response over shallow depths. The enhanced IB deviations in the Japan Sea and in Hudson Bay are also consistent with previous modeling efforts of these regions (e.g., Nam et al 2004;Greatbatch et al 1996).…”

Section: A Departures From Ib Behaviorsupporting

confidence: 86%

Effects of Stratification on the Large-Scale Ocean Response to Barometric Pressure

Ponte

Vinogradov

2007

Journal of Physical Oceanography

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Single-layer (barotropic) models have been commonly used in studies of the inverted barometer effect and the oceanic response to atmospheric pressure loading. The potential effects of stratification on this response are explored here using a general circulation model in a near-global domain with realistic coasts and bathymetry. Periodic forcing by the diurnal and semidiurnal atmospheric tides and 6-hourly stochastic forcing from weather center analyses are both examined. A global dynamic response (i.e., departures from inverted barometer behavior) is clear in the response to atmospheric tides; for stochastic forcing, the largest dynamic signals occur in shallow and semienclosed regions and at mid-and high latitudes. The influence of stratification in the dynamics is assessed by comparing surface and bottom pressure signals. Baroclinic effects are generally weak, particularly in the response to the large-scale atmospheric tides. Under stochastic forcing, largest differences between surface and bottom pressure signals reach 10%-20% of the surface signals and tend to occur in regions of enhanced topographic gradients. Bottom-intensified, localized interactions with topography seem to be involved. Enhanced baroclinicity is also seen at low latitudes, where stratification effects are also felt in the upper ocean. General implications for modeling the ocean response to high-frequency atmospheric and tidal forcing are discussed.

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Section: A Departures From Ib Behaviorsupporting

confidence: 86%

Effects of Stratification on the Large-Scale Ocean Response to Barometric Pressure

Ponte

Vinogradov

2007

Journal of Physical Oceanography

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“…High frequency (2-20 days) sea level fluctuations, driven by atmospheric pressure changes, can induce an 405 aliasing problem to altimeter data sampled at satellite orbit frequency since it is difficult to correct the nonisostatic sea level response with the standard inverse barometer (IB) method. When the IB method is applied to correct the nonisostatic sea level response, the aliasing signal can reach 10 cm (Nam et al, 2004). Nam et al (2005), however, showed that the aliasing signal is significantly reduced through the process of merging 410 with multiple-satellite altimetry data.…”

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confidence: 99%

Comparison between a reanalyzed product by 3-dimensional variational assimilation technique and observations in the Ulleung Basin of the East/Japan Sea

Kim

Chang

Park

et al. 2009

Journal of Marine Systems

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Reanalyzed products from a MOM3-based East Sea Regional Ocean Model with a 3-dimentional variational data assimilation module (DA-ESROM), have been compared 25 with the observed hydrographic and current datasets in the Ulleung Basin (UB) of the East/Japan Sea (EJS). Satellite-borne sea surface temperature and sea surface height data, and in-situ temperature profiles have been assimilated into the DA-ESROM. The performance of the DA-ESROM appears to be efficient enough to be used in an operational ocean forecast system. The DA-ESROM reproduces the development of strong southward North Korean Cold Current (NKCC) in summer consistent with the observational results, which is thought to be an improvement of the previous numerical models in the EJS. The 40 reanalyzed products show that the NKCC is about 35 km wide, and flows southward along the Korean coast from spring to summer with maximum monthly mean volume transport of about 0.8 Sv in August-September.

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“…We may consider the transport fluctuations driven by non-isostatic response of synoptic sea level variations in the EJS due to atmospheric pressure variations (Lyu et al 2002;Nam et al 2004;Lyu and Kim, 2005) as another physical process affecting current variability at station M1. Lyu et al (2002) showed that fluctuations of the transport in the KS on a synoptic time scale are derived by the nonisostatic response of sea level variation in the EJS, which acts like a forced oscillator amplifying Helmholtz-like resonance in period of about 3-5 days in the EJS.…”

Section: Wind Forcingmentioning

confidence: 99%

Vertical structure and variation of currents observed in autumn in the Korea Strait

Lee

Choi

2015

Ocean Sci. J.

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 To observe vertical structure and temporal variations of currents in the Tsushima Warm Current region of the Korea Strait, a moored buoy system was deployed in autumn 2009. The moored buoy system measured vertical profiles of current, temperature, and salinity for 24 days and a background hydrographic survey was performed. Along-strait northeastward currents were dominant in the upper layer (8-35 m). The mean current veers counterclockwise from 48 m to 74 m as much as 50°, and its speed is reduced with depth. There were distinct northward onshore currents near the bottom (65-80 m). It was demonstrated that thermal wind relation holds in the inclined pycnocline layer, which generates the counterclockwise veering current structure. Density gradient along the strait is a main factor producing the cross-strait onshore current component below the upper-layer and the cross-strait density gradient reduces the along-strait current component with depth. Previous studies have never focused on the effect of the along-strait density structure on current structure. The first Empirical Orthogonal Function mode (CM1) of current variability explains 70% of local current variations and its vertical structure is close to the mean current structure. The correlation analysis among variations of CM1 current, slope of sea level anomaly (SSLA) and local wind anomaly revealed that the variation of CM1 current is mainly related to the variation of SSLA across the strait (c-SSLA), which is known to be controlled by remote and local wind forcing. Similarity between vertical structures of mean and CM1 current suggests that thermal wind relation is the main dynamics maintaining the counterclockwise turning of CM1 current below the upper layer although the upperlayer CM1 current is controlled by c-SSLA through barotropic geostrophic relation. Time series of temperature and salinity indicate that the thermohaline front between Korean Coastal Water and Tsushima Warm Current Water meanders in time and migrates over the mooring station back and forth. The front meandering and migration also affect the local SSLA and CM1 current variations in autumn in the Korea Strait.

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Correction of TOPEX/POSEIDON altimeter data for nonisostatic sea level response to atmospheric pressure in the Japan/East Sea

Cited by 24 publications

References 13 publications

Effects of Stratification on the Large-Scale Ocean Response to Barometric Pressure

Effects of Stratification on the Large-Scale Ocean Response to Barometric Pressure

Comparison between a reanalyzed product by 3-dimensional variational assimilation technique and observations in the Ulleung Basin of the East/Japan Sea

Vertical structure and variation of currents observed in autumn in the Korea Strait

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