scholarly journals Evaluation of primary production in the northeastern Japan Sea on the base of shipboard and satellite data

2018 ◽  
Vol 195 ◽  
pp. 184-200
Author(s):  
V. I. Zvalinsky ◽  
P. V. Lobanova ◽  
P. Ya. Tishchenko ◽  
V. B. Lobanov
Keyword(s):  
Primary Production ◽  
Satellite Data ◽  
Subsurface Layer ◽  
Chlorophyll Concentration ◽  
Japan Sea ◽  
Polar Front ◽  
Euphotic Layer ◽  
Assimilation Number ◽  
Northeastern Japan ◽  
Satellite Sensors

Satellite data on chlorophyll concentration from ESA (CCI-OC) and Goddard Space Flight Center, NASA and shipboard observations of CTD, P, N, Si, inorganic carbon, DCI, and Chlaat 38 stations in the northeastern Japan Sea (46th cruise of RV Academik M.A. Lavrentyev on July 9–19, 2009) are analyzed. The highest chlorophyll concentrations were found in the subsurface layer (depth 20–40 m) or even deeper in the Polar Front zone, so they were not reflected in the satellite data. The minimal depths of the subsurface maximum were observed northward from the Polar Front where the estimations of chlorophyll concentration in the upper optical layer (Zd= 1/kd) were similar for the shipboard and satellite measurements (on average 0.384 ± 0.160 mg/m3 and 0.406 ± 0.120 mg/m3, respectively). Primary production was calculated using the assimilation number 4.46 mgC/mgChl per hour. Depth of euphotic layer was estimated using the vertical profles of nutrients and Chla. Within this layer, the primary production in the northeastern Japan Sea was evaluated for the shipboard stations as 895–2275 mgС.m–2.day–1, on average 1450 ± 430 mgС.m–2.day–1, and for the satellite data on average 770 ± 190 mgС.m–2.day–1. The estimations based on the shipboard and satellite data were weakly correlated. The shipboard estimations exceed considerably the results obtained by Koblents-Mishke et al. (1956, 1970) and Yamada et al. (2005). Poor accuracy of satellite estimations of primary production is concluded because the deeper part of the euphotic layer with the maximum concentration of chlorophyll is in shadow for satellite sensors.

scholarly journals CONDITIONS FOR PRIMARY PRODUCTION OF PHYTOPLANKTON IN THE VOSTOK BAY (JAPAN SEA) IN SPRING 2016

2019 ◽  
Vol 198 ◽  
pp. 164-185
Author(s):  
P. P. Tishchenko ◽  
P. Ya. Tishchenko ◽  
O. A. Elovskaya ◽  
V. I. Zvalinsky ◽  
Yu. V. Fedorets
Keyword(s):  
Species Composition ◽  
Dissolved Oxygen ◽  
Primary Production ◽  
Chlorophyll Concentration ◽  
Japan Sea ◽  
Zooplankton Abundance ◽  
Vostok Bay ◽  
Daily Production ◽  
Temperature Conductivity ◽  
Chl A

The Vostok Bay was surveyed on March 16–18, 2016 with measuring of water properties profiles by oceanographic sondes Sea-Bird SBE-19plus V2 and Rinko Profiler ASTD-102 with sensors of pressure, temperature, conductivity, turbidity, chlorophyll fluorescence, dissolved oxygen, and photosynthetically active radiation (PAR) and collecting of water samples by SBE-32 carousel sampler with 10 liter bottles for further measuring of nutrients (P, Si and N in forms of nitrate and ammonium) and chlorophyll a concentration and phyto- and zooplankton abundance and species composition. Assimilation number (Pb ) of phytoplankton was determined using the optical sensor of dissolved oxygen mounted on logger Rinko AR01-USB and primary production was calculated from the measured values of Pb , Chl a and PAR. Values of primary production ranged from 200 to 2100 mgC/(m2.day). The highest phytoplankton growth was detected at the depth of 8–10 m in the northern Vostok Bay and 10–16 m in its southern part. The total daily production of phytoplankton within the Bay was estimated as 12.5 tC. Species composition of phytoplankton was formed mainly by diatoms (Bacillariophyta) and dinophytes (Dinophyta). The highest biomass of raw phytoplankton was registered at the sea surface, whereas the highest values of chlorophyll concentration occurred mainly at the bottom of the bay. Species composition of zooplankton was typical for spring season, with domination of copepods presented mainly by neritic species; its biomass was in 12 times lower than the phytoplankton biomass, on average. There was concluded that photosynthetic activity of phytoplankton was limited by nitrate availability, therefore it was intensified by penetration of relatively cold, nitrogen-rich waters from the deep-water sea to the Vostok Bay.

scholarly journals SEASONAL CHANGES OF VERTICAL PROFILES OF CHLOROPHYLL A IN THE AMUR BAY (JAPAN SEA)

2018 ◽  
Vol 193 ◽  
pp. 183-189
Author(s):  
A. D. Zharova ◽  
Yu. I. Zuenko
Keyword(s):  
Chlorophyll A ◽  
Satellite Data ◽  
Seasonal Changes ◽  
Subsurface Layer ◽  
Peter The Great Bay ◽  
Japan Sea ◽  
Vertical Profiles ◽  
Amur Bay ◽  
Chl A ◽  
External Part

Seasonal changes of chlorophyll a profiles are traced over the Amur Bay (Peter the Great Bay, Japan Sea) in May-October, 2017 by means of oceanographic sonde-profiler equipped with fluorometer. Two principally different types of the vertical profiles are revealed, which were formed by different mechanisms of productivity: i) Chl a concentration had the maximum at the sea surface and decreased with the depth in the internal part of the bay occupied by the estuarine waters, and ii) Chl a concentration had the maximum below the seasonal pycnocline in the external part of the bay connected with the open sea. The highest Chl a concentration was observed in July-August for the estuarine type because of summer monsoon flood on the rivers, but in September for the marine type because of the coastal upwelling induced by monsoon winds change. Comparing these results with estimations of Chl a concentration made with the satellite data, insufficient correspondence is concluded for the external part of the bay, outside the estuarine zone, because the satellite data don’t reflect well the chlorophyll a in the subsurface layer and its seasonal variations. Thus, underestimation of real productivity and feeding ability of marine areas is available with the satellite data on chlorophyll a. 

scholarly journals Estimation of primary production in the northwestern part of the Sea of Japan by ship- and satellite-based observations

2019 ◽  
Vol 59 (1) ◽  
pp. 45-55
Author(s):  
V. I. Zvalinsky ◽  
P. V. Lobanova ◽  
P. Ya. Tishchenko ◽  
V. B. Lobanov
Keyword(s):  
Primary Production ◽  
Japan Sea ◽  
The Sea Of Japan ◽  
Northwestern Part ◽  
In Situ Data ◽  
The North ◽  
Assimilation Number ◽  
The Japan Sea ◽  
Main Production ◽  
Derived Data

In this paper, we analyzed data of POI FAB RAS cruise (No. 33) held on «Akademik M.A. Lavrentyev» vessel in the northwestern part of the Japan Sea in May 2004 and compared them with satellite derived data from Climate Change Initiative Ocean Colour (CCI-OC) and Ocean productivity databases. The following in situ data were used for the analysis: CTD-data, assimilation number, nutrients (P, N, Si) and chlorophyll a (Chl). Ship assessments of Chl in the first optical layer were in average 0.5±0.58 mg/m3, while satellite Chl were nearly twice more – 0.95±0.36 mg/m3. Ship assessments of primary production (PP) were 1870±900 mg C/m2day that is 1.5 times larger than satellite derived data - 1226±432. Vertical profiles of nutrients, temperature and Chl showed that main mass of Chl was concentrated in a layer from 20 to 45 m, where the main production is formed. According to values of assimilation number, main production formed in a layer of 0-55 m in the south of the region and 0-30 m in the north. Weak correlation between ship and satellite PP values found in this paper may be explained by low accuracy of satellite derived estimation.

Mass Appearance of Cyanobacterium Planktothrix rubescens in Lake Piaseczno, Poland

2003 ◽  
Vol 38 (1) ◽  
pp. 141-152 ◽  
Author(s):  
Danuta Krupa ◽  
Krzysztof Czernaś
Keyword(s):  
Dissolved Oxygen ◽  
Primary Production ◽  
Catchment Area ◽  
High Water ◽  
Water Bloom ◽  
High Water Temperature ◽  
Dissolved Oxygen Concentration ◽  
Planktothrix Rubescens ◽  
Assimilation Number ◽  
Bottom Zone

Abstract In 1989, Lake Piaseczno, Poland, exhibited a mass appearance of Planktothrix rubescens. During this time the pelagic and littoral areas exhibited significant increases in areal primary production (400 and 41 mg C m-2 h-1, respectively), chlorophyll α (100 and 6.9 mg m-2, respectively) and assimilation number (4 and 5.9 mg C m-2 h-1/mg chlα m-2, respectively). After the water bloom subsided, a reduction of dissolved oxygen concentration (down to 1.5 mg L-1) and high water temperature (10.2°C) in the offshore bottom zone was observed. While from 1991 to 1996, the primary production, chlorophyll α concentration and assimilation number values were decreasing, they were significantly higher than the values reported in 1986, prior to the mass cyanobacteria appearance. An indirect correlation with ion levels indicated that the outbreak of the cyanobacteria was linked with inflow of nutrients from the catchment area. The dramatic changes in the range and variability of the phytoplankton density indicate that the recent eutrophication of the lake has had profound effects on the structure and productivity of the aquatic community.

scholarly journals Changing seasonality of the Baltic Sea

2016 ◽  
Vol 13 (4) ◽  
pp. 1009-1018 ◽  
Author(s):  
Mati Kahru ◽  
Ragnar Elmgren ◽  
Oleg P. Savchuk
Keyword(s):  
Baltic Sea ◽  
Chlorophyll Concentration ◽  
Ecological Status ◽  
Sea Surface ◽  
Seasonal Cycles ◽  
The Baltic Sea ◽  
Several Variables ◽  
Satellite Sensors ◽  
The Baltic ◽  
Increasing Trends

Abstract. Changes in the phenology of physical and ecological variables associated with climate change are likely to have significant effect on many aspects of the Baltic ecosystem. We apply a set of phenological indicators to multiple environmental variables measured by satellite sensors for 17–36 years to detect possible changes in the seasonality in the Baltic Sea environment. We detect significant temporal changes, such as earlier start of the summer season and prolongation of the productive season, in several variables ranging from basic physical drivers to ecological status indicators. While increasing trends in the absolute values of variables like sea-surface temperature (SST), diffuse attenuation of light (Ked490) and satellite-detected chlorophyll concentration (CHL) are detectable, the corresponding changes in their seasonal cycles are more dramatic. For example, the cumulative sum of 30 000 W m−2 of surface incoming shortwave irradiance (SIS) was reached 23 days earlier in 2014 compared to the beginning of the time series in 1983. The period of the year with SST of at least 17 °C has almost doubled (from 29 days in 1982 to 56 days in 2014), and the period with Ked490 over 0.4 m−1 has increased from about 60 days in 1998 to 240 days in 2013 – i.e., quadrupled. The period with satellite-estimated CHL of at least 3 mg m−3 has doubled from approximately 110 days in 1998 to 220 days in 2013. While the timing of both the phytoplankton spring and summer blooms have advanced, the annual CHL maximum that in the 1980s corresponded to the spring diatom bloom in May has now shifted to the summer cyanobacteria bloom in July.

scholarly journals Towards a global glacier inventory from satellite data

2010 ◽  
Vol 65 (2) ◽  
pp. 103-112 ◽  
Author(s):  
F. Paul
Keyword(s):  
Satellite Data ◽  
The United States ◽  
Inventory Data ◽  
Hydro Power ◽  
Glacier Inventory ◽  
Digital Format ◽  
Run Off ◽  
Digital Elevation ◽  
Satellite Sensors ◽  
The 1960S

Abstract. There is a major need for a complete and detailed global glacier inventory that is freely available in a digital format (vector outlines with attribute data) for all kinds of glaciological assessments, e.g. sea level rise, hydro-power, run-off and natural hazards. However, such an inventory is not yet available and the uncertainties due to the missing data for related calculations are large. While the existing World Glacier Inventory offers tabular data that were compiled from aerial photography and maps during the 1960s to 1970s for about 72'000 glaciers, current efforts are being exerted within the framework of the Global Land Ice Measurements from Space (GLIMS) initiative to compile vector outlines from satellite data and combine them with digital elevation models (DEMs). At this point, inventory data from about 100'000 of the estimated 160'000 glaciers are available in the GLIMS database. Due to the now free availability of satellite data from the United States Geological Survey's archive and near global DEMs with appropriate spatial resolution, a globally complete and detailed glacier inventory appears viable. This contribution provides an overview of past and ongoing activities related to the creation of glacier inventory data from satellite sensors, along with the methods employed and the challenges encountered in different parts of the world.

scholarly journals SPATIAL-TEMPORAL DISTRIBUTION OF CHLOROPHYLL-A IN SOUTHERN PART OF THE MAKASSAR STRAIT

2018 ◽  
Vol 4 (1) ◽  
Author(s):  
Wasir Samad Daming ◽  
Muhammad Anshar Amran ◽  
Amir Hamzah Muhiddin ◽  
Rahmadi Tambaru
Keyword(s):  
Chlorophyll A ◽  
Satellite Data ◽  
Chlorophyll Concentration ◽  
Temporal Distribution ◽  
Fishing Ground ◽  
Landsat 8 ◽  
Trade Winds ◽  
Chl A ◽  
June July ◽  
Potential Area

Surface chlorophyll-a (Chl-a) distribution have been analyzed with seasonal variation during southeast monsoon in southern part of Makassar Strait and Flores Sea. Satellite data of Landsat-8 is applied to this study to formulate the distribution of chlorophyll concentration during monsoonal wind period. The distribution of chlorophyll concentration was normally peaked condition in August during southeast monsoon. Satellite data showed that a slowdown in the rise of the distribution of chlorophyll in September with a lower concentration than normal is likely due to a weakening the strength of southeast trade winds during June – July – August 2016. Further analysis shows that the southern part of the Makassar strait is likely occurrence of upwelling characterized by increase in surface chlorophyll concentrations were identified as the potential area of fishing ground.

scholarly journals Global ecosystem overfishing: Clear delineation within real limits to production

2019 ◽  
Vol 5 (6) ◽  
pp. eaav0474 ◽  
Author(s):  
Jason S. Link ◽  
Reg A. Watson
Keyword(s):  
Primary Production ◽  
Satellite Data ◽  
Strong Evidence ◽  
Trophic Transfer ◽  
Marine Ecosystems ◽  
Tropical Fish ◽  
Transfer Efficiency ◽  
Target Populations ◽  
Trophic Transfer Efficiency ◽  
Clear Delineation

The well-documented value of marine fisheries is threatened by overfishing. Management typically focuses on target populations but lacks effective tools to document or restrain overexploitation of marine ecosystems. Here, we present three indices and accompanying thresholds to detect and delineate ecosystem overfishing (EOF): the Fogarty, Friedland, and Ryther indices. These are based on widely available and readily interpreted catch and satellite data that link fisheries landings to primary production using known limits of trophic transfer efficiency. We propose theoretically and empirically based thresholds for each of those indices; with these criteria, several ecosystems are fished sustainably, but nearly 40 to 50% of tropical and temperate ecosystems exceed even extreme thresholds. Applying these criteria to global fisheries data results in strong evidence for two specific instances of EOF, increases in both pressure on tropical fish and a climate-mediated polar shift. Here, we show that these two patterns represent evidence for global EOF.

Sign in / Sign up

Export Citation Format

Share Document