Nutrient pumping/advection by propagating Rossby Waves in the Kuroshio Extension

Chu, Peter C.; Kuo, Yu-Heng

doi:10.1016/j.dsr2.2010.04.007

Cited by 7 publications

(3 citation statements)

References 14 publications

(17 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although some previous studies suggested that nutrients might be supplied through upwelling associated with the mesoscale eddies that are frequently found around fronts [ Kimura et al ., , ; McGillicuddy et al ., , ; Chu and Kuo , ; Sasai et al ., ; Sumata et al ., ], it has also been suggested that nutrients are supplied by the vertical transport on a narrower horizontal scale that occurs very close to the front and rim of such eddies [ Mahadevan and Archer , ; Lévy et al ., ; Mahadevan et al ., ]. Recent studies conducted in other frontal regions have revealed that vertical transport due to turbulent mixing is important for nutrient supply on the dense side of the front (the Gulf Stream [ Hales et al ., ] and the California Current [ Johnston et al ., ]).…”

Section: Introductionmentioning

confidence: 99%

Observations of vertical turbulent nitrate flux across the Kuroshio

Kaneko

Yasuda

Komatsu

et al. 2013

Geophysical Research Letters

View full text Add to dashboard Cite

[1] The vertical turbulent nitrate flux was calculated across the Kuroshio based on direct turbulence measurements and nitrate concentrations. Profile data were analyzed relative to the main axis of the Kuroshio front, the location of maximum surface velocity. Large upward nitrate flux on the northern side of the front, O(10, was observed from 300 m up to the base of the euphotic layer. Enhanced turbulence and a large vertical nitrate gradient contributed to this flux. On this side, high concentrations of chlorophyll-a were also observed near the surface, and the large nitrate flux is consistent with a previous estimate of the rate of new production. In contrast, south of the axis, the nitrate flux was O(10 -8 -10 À7

show abstract

Section: Introductionmentioning

confidence: 99%

Observations of vertical turbulent nitrate flux across the Kuroshio

Kaneko

Yasuda

Komatsu

et al. 2013

Geophysical Research Letters

View full text Add to dashboard Cite

show abstract

“…In this area, the east‐flowing North Pacific Current originates from the Kuroshio Extension in the central Pacific. Enhanced vertical mixing events associated with variability in the strength of the North Pacific Current and with eddies of the system can bring nutrient‐rich waters to the surface [ Cummins and Freeland , 2007; Chu and Kuo , 2010] which likely contributes to the observed gradient in Zn concentrations from east to west noted by Fukuda et al [2000].…”

Section: Introductionmentioning

confidence: 99%

Dissolved zinc in the subarctic North Pacific and Bering Sea: Its distribution, speciation, and importance to primary producers

Jakuba

Saito

Moffett

et al. 2012

Global Biogeochemical Cycles

View full text Add to dashboard Cite

The eastern subarctic North Pacific, an area of high nutrients and low chlorophyll, has been studied with respect to the potential for iron to control primary production. The geochemistry of zinc, a critical micronutrient for diatoms, is less well characterized. Total zinc concentrations and zinc speciation were measured in near‐surface waters on transects across the subarctic North Pacific and across the Bering Sea. Total dissolved zinc concentrations in the near‐surface ranged from 0.10 nmol L−1 to 1.15 nmol L−1 with lowest concentrations in the eastern portions of both the North Pacific and Bering Sea. Dissolved zinc speciation was dominated by complexation to strong organic ligands whose concentration ranged from 1.1 to 3.6 nmol L−1 with conditional stability constants (K′ZnL/Zn′) ranging from 109.3 to 1011.0. The importance of zinc to primary producers was evaluated by comparison to phytoplankton pigment concentrations and by performing a shipboard incubation. Zinc concentrations were positively correlated with two pigments that are characteristic of diatoms. At one station in the North Pacific, the addition of 0.75 nmol L−1 zinc resulted in a doubling of chlorophyll after 4 days.

show abstract

“…Over the last few decades, the coastal regions throughout the world have experienced incidences of harmful algal bloom (HAB) with potential threat to humans as well as marine organisms, owing to accelerated eutrophication from human activities and certain oceanic processes (Chu and Kuo, 2010). Accurate identification of these blooms remains a great challenge with the standard bio-optical algorithms applied to satellite ocean color data in optically complex coastal water containing high concentrations of the interfered dissolved organic and particulate inorganic materials (Ahn and Shanmugam, 2006).…”

Section: Introductionmentioning

confidence: 99%

Detection of red tides in the Southwestern Florida coastal region using ocean color data

Chu

Kuo

2010

Oceans 2010 MTS/Ieee Seattle

View full text Add to dashboard Cite

Near real-time ocean color data from the Seaviewing Wide Field-of-view Sensor (SeaWiFS) was used to detect and trace harmful algal bloom (HAB) (also termed as red tides) in the Southwest Florida coastal water, which was treated as Case-2 water, i.e., its optical characteristics are influenced not only by phytoplankton and related particles, but also by other substances, that vary independently of phytoplankton, notably inorganic particles in suspension and yellow substances. Similar to Ahn et al. (2006), a red tide index was constructed from in-situ radiometric measurements of the three SeaWiFS bands centered at 411 nm, 510 nm, and 555 nm to achieve derivation of indices that are then related to absorbing characteristics of harmful algae (i.e., Lw at 443 nm) from which a best fit with a cubic polynomial function is obtained providing indices of higher ranges for HABs and lower and slightly reduced ranges for turbid and non-bloom water. In order to quantify the HABs in terms of chlorophyll (Chl), an empirical relationship is established between the RI and in-situ Chl in surface water which yields a Red tide index ChlorophyllAlgorithm (RCA). In contrast, the band-ratio chlorophyll product of SeaWiFS in this complex coastal environment provided false information. The red tide that formed from November to December 2004 off SW Florida was revealed by RCA imagery, and was confirmed by field sampling to contain medium (10 4 to 10 5 cells L -1 ) to high (>10 5 cells L -1 ) concentrations of the toxic Karenia brevis. The RCA imagery also showed that the bloom started in mid October south of Charlotte Harbor, and that it developed and moved to the south and southwest in the subsequent weeks. Our results show that the SeaWiFS data provides an unprecedented tool for research and managers to study and monitor algal blooms in coastal environments.

show abstract

Nutrient pumping/advection by propagating Rossby Waves in the Kuroshio Extension

Cited by 7 publications

References 14 publications

Observations of vertical turbulent nitrate flux across the Kuroshio

Observations of vertical turbulent nitrate flux across the Kuroshio

Dissolved zinc in the subarctic North Pacific and Bering Sea: Its distribution, speciation, and importance to primary producers

Detection of red tides in the Southwestern Florida coastal region using ocean color data

Contact Info

Product

Resources

About