Interpretation of the Report on Temporal Dynamics and Spatial Distribution of Global Carbon Source and Sink

2019 ◽  
Author(s):  
Wang Jiahui ◽  
Liang Liang ◽  
Li Han ◽  
Chen Chunyang ◽  
Huang Ting ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Carbon Source ◽  
Temporal Dynamics ◽  
Global Carbon ◽  
Source And Sink

scholarly journals Spatial distribution and temporal variation of microcrustaceans assembly (Cladocera and Copepoda) in different compartments of a reservoir in the brazilian semiarid region

2018 ◽  
Vol 30 (0) ◽  
Author(s):  
Josiane Souza Santos ◽  
Nadson Ressyé Simões ◽  
Sérgio Luiz Sonoda
Keyword(s):  
Spatial Distribution ◽  
Spatial Variation ◽  
Temporal Variation ◽  
Aquatic Macrophytes ◽  
Temporal Dynamics ◽  
Lateral Compartment ◽  
Spatial And Temporal Variation ◽  
Semiarid Region ◽  
Brazilian Semiarid ◽  
Significant Spatial Variation

Abstract Aim: The objective of this study was to investigate the spatial and temporal variation of microcrustacean assemblages of a reservoir in the Brazilian semiarid region. Methods Physical and chemical water variables and samples of microcrustaceans were collected at eight sites of the reservoir between July 2013 and November 2014, in a total of seven campaigns. For this study, the reservoir was categorized in two compartments: lateral and central. Results Limnological variables showed significant temporal variation (PERMANOVA, Pseudo-F = 19.51, p = 0.001). Higher turbidity values and suspended solids were observed in the rainiest months, while during the dry months, we measured higher values of transparency, dissolved oxygen, and chlorophyll-a. It was not found significant spatial variation of limnological variables (PERMANOVA, Pseudo-F = 0.96; p = 0.394). During the study period, ten species were recorded: four Cladocera (Ceriodaphnia cornuta, Daphnia gessneri, Diaphanosoma birgei and Diaphanosoma spinulosum ) three Copepoda Calanoida (Argyrodiaptomus azevedoi, Notodiaptomus cearensis and Notodiaptomus iheringi) and three Copepoda Cyclopoida (Macrocyclops albidus, Thermocyclops minutus and Thermocyclops decipiens). The microcrustacean assemblages showed significant temporal variation (PERMANOVA, Pseudo-F = 4.34; p = 0.001) as well as significant spatial variation (PERMANOVA, Pseudo-F = 9.46; p = 0.001). The highest values of abundance and richness were observed in the lateral compartment, this result is mainly related to the presence of aquatic macrophytes in this region, because the analysis of partial RDA indicated that limnological variables explained only 11% of this variation (Pseudo-F = 2.08, p = 0.001). Conclusions The results suggest that the seasonality of the semiarid is an important factor in the temporal dynamics of the limnological variables, while the aquatic macrophytes play an important role in the spatial distribution of the microcrustacean assembly.

Towards the estimation of DOC from space in the open ocean

2020 ◽  
Author(s):  
Ana Gabriela Bonelli ◽  
Hubert Loisel ◽  
Vincent Vantrepotte ◽  
Daniel Jorge ◽  
Antoine Mangin ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Temporal Dynamics ◽  
Open Ocean ◽  
Colored Dissolved Organic Matter ◽  
Ocean Water ◽  
Chl A ◽  
First Results ◽  
Spatio Temporal ◽  
Input Variables ◽  
Global Carbon

<p>The Dissolved Organic Carbon (DOC) represents the largest pool of organic carbon and the most active carbon compartment in the ocean. Describing the spatio-temporal dynamics of the oceanic DOC in response to variation in the physical of biological forcings is therefore crucial for better understanding the global carbon cycle. The DOC distribution and its temporal dynamics is however currently not well known.</p><p>In the recent years several works have demonstrated the possibility to assess from space the DOC distribution in the coastal ocean thanks to direct relationships between DOC and the optical properties of colored dissolved organic matter (CDOM). Such CDOM-DOC relationships are not applicable for the open ocean water due making more complex the DOC estimation from space in the latter environments. Here we present first results documenting an alternative method for estimating DOC from satellite imagery which rely on the use of a neural network which combines different physical and biogeochemical input variables (SST, SSS, PAR, aCDOM and Chl-a).</p>

Spatial distribution and temporal dynamics of high-elevation forest stands in southern Siberia

2010 ◽  
Vol 19 (6) ◽  
pp. 822-830 ◽  
Author(s):  
Vyacheslav I. Kharuk ◽  
Kenneth J. Ranson ◽  
Sergey T. Im ◽  
Alexander S. Vdovin
Keyword(s):  
Spatial Distribution ◽  
Temporal Dynamics ◽  
High Elevation ◽  
Forest Stands ◽  
Southern Siberia ◽  
High Elevation Forest

Zooplankton in Advective Environments: The Hudson River Community and a Comparative Analysis

1992 ◽  
Vol 49 (5) ◽  
pp. 1060-1069 ◽  
Author(s):  
Michael L. Pace ◽  
Stuart E. G. Findlay ◽  
David Lints
Keyword(s):  
Spatial Distribution ◽  
Dominant Species ◽  
Temporal Dynamics ◽  
Hudson River ◽  
Zooplankton Biomass ◽  
Spatial Distributions ◽  
Water Residence Time ◽  
Advective Transport ◽  
Lotic Environments ◽  
Planktonic Communities

The temporal dynamics and spatial distributions of zooplankton in the tidal freshwater portion of the Hudson River were studied over a 3-yr period. We tested the hypothesis that advective transport regulates zooplankton biomass in the Hudson and in lakes, estuaries, and rivers for which we have published values. In the Hudson, zooplankton biomass was negatively correlated with discharge over the entire season (P < 0.0001) as well as during the warmer period of the year (P = 0.007) when biomass was greatest. The spatial distribution of zooplankton over 160-km transects was heterogeneous. Downstream changes in the abundance of a dominant species, Bosmina longirostris, indicate that certain areas of the river support net population growth whereas other areas are population sinks. We infer that zooplankton biomass in the Hudson is a function of the balance between reproduction determined by resources and losses due to advection. Zooplankton biomass differs among lakes, estuaries, and rivers in a manner consistent with the differences in water residence time. Biomass is highest in lakes, lower in saline estuaries and tidal rivers, and lowest in rivers. Advective losses appear to be important in explaining differences between planktonic communities in lentic and lotic environments.

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