East China Sea Kuroshio 2002-2004 Data Report. Part 1. The URI/JAMSTEC Measurements. Part 2. The SNU/KORDI Measurements

Andres, Magadelena; Chang-Su, Chang; Hong, Kyung Il; Ichikawa, Hiroshi; Lee, Jae-Hak; Lee, Dong‐Kyu; Lim, Byung-Ho; Mitchell, Douglas A.; Tracey, Karen L.; Teague, William J.

doi:10.21236/ada477585

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“…For each array, the raw s records measured by the instruments, s meas , are converted to reference values, s ref (Figure A1), by using deep hydrographic casts from the region to establish the deep ocean's contribution to s meas [Andres et al, 2005]. Since deep-ocean temperature and salinity (and hence sound speed) vary little, this relationship is primarily controlled by the (time-invariant) vertical distance between the instrument depth and the reference depth.…”

Section: Piessmentioning

confidence: 99%

“…For the Taiwan array, hourly pressure and acoustic travel time records from each PIES (P b and s meas ) are despiked, dedrifted, and detided according to the standard procedures [Kennelly et al, 2007]. Using the methods outlined in Andres et al [2005] and Kennelly et al [2007], the hourly acoustic travel time records from each PIES, s meas , are first converted to s ref , then 3 day low-pass filtered, and finally mapped (see Appendix B). The filtered, mapped s ref time series are then used with the region-specific empirical lookup tables (GEMs) to obtain time-varying profiles of specific volume anomaly, a(z)-or alternatively, density or temperature profiles, q(z) or T(z).…”

Section: Pies Data Processingmentioning

confidence: 99%

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Downstream evolution of the Kuroshio's time‐varying transport and velocity structure

et al. 2017

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Observations from two companion field programs—Origins of the Kuroshio and Mindanao Current (OKMC) and Observations of Kuroshio Transport Variability (OKTV)—are used here to examine the Kuroshio's temporal and spatial evolution. Kuroshio strength and velocity structure were measured between June 2012 and November 2014 with pressure‐sensor equipped inverted echo sounders (PIESs) and upward‐looking acoustic Doppler current profilers (ADCPs) deployed across the current northeast of Luzon, Philippines, and east of Taiwan with an 8 month overlap in the two arrays' deployment periods. The time‐mean net (i.e., integrated from the surface to the bottom) absolute transport increases downstream from 7.3 Sv (±4.4 Sv standard error) northeast of Luzon to 13.7 Sv (±3.6 Sv) east of Taiwan. The observed downstream increase is consistent with the return flow predicted by the simple Sverdrup relation and the mean wind stress curl field over the North Pacific (despite the complicated bathymetry and gaps along the North Pacific western boundary). Northeast of Luzon, the Kuroshio—bounded by the 0 m s−1 isotach—is shallower than 750 dbar, while east of Taiwan areas of positive flow reach to the seafloor (3000 m). Both arrays indicate a deep counterflow beneath the poleward‐flowing Kuroshio (–10.3 ± 2.3 Sv by Luzon and −12.5 ± 1.2 Sv east of Taiwan). Time‐varying transports and velocities indicate the strong influence at both sections of westward propagating eddies from the ocean interior. Topography associated with the ridges east of Taiwan also influences the mean and time‐varying velocity structure there.

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Section: Piessmentioning

confidence: 99%