A test of empirical and semi-analytical algorithms for euphotic zone depth with SeaWiFs data off southeastern China

2007 ◽  
Author(s):  
Jingjing Chen ◽  
Shaoling Shang ◽  
Junwu Tang ◽  
Zhongping Lee ◽  
Huasheng Hong ◽  
...  
Keyword(s):  
Euphotic Zone ◽  
Southeastern China ◽  
Zone Depth

scholarly journals Euphotic zone depth: Its derivation and implication to ocean-color remote sensing

2007 ◽  
Vol 112 (C3) ◽  
Author(s):  
ZhongPing Lee ◽  
Alan Weidemann ◽  
John Kindle ◽  
Robert Arnone ◽  
Kendall L. Carder ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Ocean Color ◽  
Euphotic Zone ◽  
Ocean Color Remote Sensing ◽  
Zone Depth

Bio-Optical Models for Estimating Euphotic Zone Depth in the Western Atlantic Sector of the Southern Ocean in the Antarctic Summer

2021 ◽  
pp. 241-250
Author(s):  
Pavel A. Salyuk ◽  
Vladimir A. Artemiev ◽  
Dmitry I. Glukhovets ◽  
Alexander N. Khrapko ◽  
Anatoly V. Grigoriev ◽  
...  
Keyword(s):  
Southern Ocean ◽  
Euphotic Zone ◽  
Western Atlantic ◽  
Atlantic Sector ◽  
Zone Depth ◽  
The Antarctic

scholarly journals EL BAJO DE ESPÍRITU SANTO; PUNTO CALIENTE DE ABUNDANCIA BIOLÓGICA AFUERA DE BAHÍA DE LA PAZ

2018 ◽  
Vol 33 (1) ◽  
pp. 13
Author(s):  
Eduardo González -Rodríguez ◽  
Armando Trasviña -Castro ◽  
Alejandro Ramos -Rodríguez
Keyword(s):  
Biological Activity ◽  
Gulf Of California ◽  
Net Primary Productivity ◽  
Late Summer ◽  
Euphotic Zone ◽  
Vertical Transport ◽  
High Biological Activity ◽  
La Paz ◽  
Secondary Consumers ◽  
Zone Depth

El Bajo Espíritu Santo (EBES) es una montaña submarina localizada a 9 millas náuticas del extremo norte del archipiélago del Espíritu Santo, afuera de Bahía de La Paz, el cual es considerado un punto caliente de biodiversidad y biomasa. Algunos procesos que enriquecen el bajo son advección y transporte vertical, ocasionado principalmente por mareas y corrientes que chocan con la montaña. Asimismo, existe retención de organismos, particularmente zooplancton, causando enriquecimiento biológico. Así, para identificar la variabilidad de los procesos estacionales e interanuales que la afectan se realizó una revisión bibliográfica sobre hidrografía, dinámica y biología del EBES, que se complementa con análisis de series de tiempo utilizando información satelital sobre temperatura superficial del mar, clorofila superficial, productividad primaria neta y profundidad de la zona eufótica. Los resultados indican que dentro de los principales procesos que enriquecen al bajo se encuentran la mezcla debida al corte vertical de las corrientes, el transporte vertical ocasionado por corrientes de mareas que chocan con la montaña, la advección mediante chorros de corriente originados en el interior de la bahía y/o remolinos del Golfo de California, y la retención de organismos del zooplancton en la vecindad de la montaña por el obstáculo que esta impone. Se muestran dos periodos de productividad:  primavera y verano, i.e., un régimen bimodal con períodos dominantes de 12 y 6 meses respectivamente. Adicionalmente, existe variabilidad inter-anual dominada por periodos de 5 y 7.5 años asociada a ENSO. La combinación de factores confiere a EBES capacidad de enriquecimiento de nutrientes y plancton a lo largo del año, lo que atrae consumidores secundarios y depredadores tope, convirtiéndolo en un punto de gran actividad biológica.Bajo Espitritu Santo; biological abundance hotspot off Bahia de La PazABSTRACT. Bajo Espíritu Santo (EBES) is a submarine mountain located 9 nautical miles from the northern end of the Espíritu Santo archipelago, outside Bahia de La Paz. It is considered as a hotspot of biodiversity and biomass that has motivated studies to understand the processes that make it an area of high biological activity. Processes that enrich the EBES are advection and vertical transport, mainly caused by tides and currents that collide with the mountain. Also, there is retention of organisms, particularly zooplankton, which favors a biological enrichment. A review on hydrography, dynamics and biology is presented, complemented with time series analysis of satellite information on sea surface temperature, surface chlorophyll, net primary productivity, and euphotic zone depth, to identify the variability of seasonal and interannual processes affecting the mountain. The main processes that enrich EBES are mixture due to the vertical cut of the currents; the vertical transport caused by tidal currents that collide with the mountain; advection by jet currents originating in the interior of the bay and/or eddies from the Gulf of California; the retention of zooplankton organisms in the vicinity of the mountain. Two periods of productivity, one in spring and the other at late summer indicate a bimodal regime with dominant periods of 12 and 6 months respectively. Additionally, there is an inter-annual variability dominated by periods of 5 and 7.5 years associated with ENSO. Combination of these factors give EBES its ability for nutrient and plankton enrichment throughout the year, which attracts secondary consumers and top predators, turning it into a point of great biological activity.

scholarly journals Comparison of Primary Production Using in situ and Satellite-Derived Values at the SEATS Station in the South China Sea

2021 ◽  
Vol 8 ◽  
Author(s):  
Yung-Yen Shih ◽  
Fuh-Kwo Shiah ◽  
Chao-Chen Lai ◽  
Wen-Chen Chou ◽  
Jen-Hua Tai ◽  
...  
Keyword(s):  
Primary Production ◽  
Carbon Fixation ◽  
Negative Relationship ◽  
Euphotic Zone ◽  
Production Model ◽  
Global Ocean ◽  
The South ◽  
Fixation Rate ◽  
Zone Depth

Satellite-based observations of primary production (PP) are broadly used to assess carbon fixation rate of phytoplankton in the global ocean with small spatiotemporal limitations. However, the remote sensing can only reach the ocean surface, the assumption of a PP vertically exponential decrease with increasing depth from the surface to the bottom of euphotic zone may cause a substantial and potential discrepancy between in situ measurements and satellite-based observations of PP. This study compared euphotic zone integrated PP derived from measurements based on ship-based in situ incubation (i.e., PPin situ) and those derived from the satellite-based vertically generalized production model (VGPM; PPVGPM) for the period 2003∼2016 at the South East Asian Time-series Study (SEATS) station. PP values obtained during the NE-monsoon (NEM: Nov∼Mar; PPin situ = 323 ± 134; PPVGPM = 443 ± 142 mg-C m–2 d–1) were ∼2-fold higher than those recorded during the SW-monsoon (SWM: Apr∼Oct; PPin situ = 159 ± 58; PPVGPM = 250 ± 36 mg-C m–2 d–1), regardless of the method used for derivation. The main reason for the higher PP values during the NEM appears to have been a greater abundance of inorganic nutrients were made available by vertical advection. Note that on average, PPin situ estimates were ∼50% lower than PPVGPM estimates, regardless of the monsoon. These discrepancies can be mainly attributed to differences from the euphotic zone depth between satellite-based and in situ measurements. The significantly negative relationship between PP measurements obtained in situ and sea surface temperatures observed throughout this study demonstrates that both methods are effective indicators in estimating PP. Overall, our PPin situ analysis indicates that a warming climate is unfavorable for primary production in low-latitude open ocean ecosystems.

A Modified Semianalytical Algorithm for Remotely Estimating Euphotic Zone Depth in Turbid Inland Waters

2015 ◽  
Vol 8 (4) ◽  
pp. 1545-1554 ◽  
Author(s):  
Wei Yang ◽  
Bunkei Matsushita ◽  
Kazuya Yoshimura ◽  
Jin Chen ◽  
Takehiko Fukushima
Keyword(s):  
Euphotic Zone ◽  
Inland Waters ◽  
Zone Depth ◽  
Turbid Inland Waters

Dynamics of euphotic zone depth in the Bohai Sea and Yellow Sea

2021 ◽  
Vol 751 ◽  
pp. 142270
Author(s):  
Shengqiang Wang ◽  
Jun Lv ◽  
Junwei Nie ◽  
Deyong Sun ◽  
Hanwei Liang ◽  
...  
Keyword(s):  
Yellow Sea ◽  
Bohai Sea ◽  
Euphotic Zone ◽  
The Bohai Sea ◽  
Zone Depth

Reconciling Between Optical and Biological Determinants of the Euphotic Zone Depth

2021 ◽  
Vol 126 (5) ◽  
Author(s):  
Jinghui Wu ◽  
Zhongping Lee ◽  
Yuyuan Xie ◽  
Joaquim Goes ◽  
Shaoling Shang ◽  
...  
Keyword(s):  
Euphotic Zone ◽  
Biological Determinants ◽  
Zone Depth
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