scholarly journals In situ measurements and model calculations of primary production in turbid waters

2008 ◽  
Vol 3 ◽  
pp. 19-30 ◽  
Author(s):  
H Arst ◽  
T Nõges ◽  
P Nõges ◽  
B Paavel
Keyword(s):  
Primary Production ◽  
In Situ Measurements ◽  
Model Calculations ◽  
Turbid Waters

The Simulated in situ Measurements of Oceanic Primary Production

1963 ◽  
Vol 14 (2) ◽  
pp. 139 ◽  
Author(s):  
HR Jitts
Keyword(s):  
Primary Production ◽  
In Situ Measurements ◽  
Light Conditions ◽  
Significant Relation ◽  
Blue Glass ◽  
Simultaneous Measurements ◽  
Reflected Light

Simultaneous measurements with two types of incubators were made on replicate samples both in the incubators and in situ in the ocean. Both incubators used sunlight and blue glass filters to simulate light conditions at depths in the ocean. The first gave measurements of column production 1.58 times those in situ. This was due to the fact that at depths greater than 20 m the incubator gave much higher results with no significant relation to those measured in situ. In the second incubator the accuracy of reproduction of oceanic light conditions was improved by reducing reflected light and using a balance-by-depth twin photometer system for determining the depths of sampling. The measurements of column production in the second incubator were 1.03 times the in situ values.

Mosses in High-Arctic lakes: in situ measurements of annual primary production and decomposition

Polar Biology ◽  
2015 ◽  
Vol 39 (3) ◽  
pp. 543-552 ◽  
Author(s):  
T. Riis ◽  
K. S. Christoffersen ◽  
A. Baattrup-Pedersen
Keyword(s):  
Primary Production ◽  
High Arctic ◽  
In Situ Measurements ◽  
Arctic Lakes ◽  
Annual Primary Production

Estimation of gross primary production in wheat from in situ measurements

2010 ◽  
Vol 12 (3) ◽  
pp. 183-189 ◽  
Author(s):  
Chaoyang Wu ◽  
Xiuzhen Han ◽  
Jinsheng Ni ◽  
Zheng Niu ◽  
Wenjiang Huang
Keyword(s):  
Primary Production ◽  
Gross Primary Production ◽  
In Situ Measurements

scholarly journals Primary Production, an Index of Climate Change in the Ocean: Satellite-Based Estimates over Two Decades

2020 ◽  
Vol 12 (5) ◽  
pp. 826 ◽  
Author(s):  
Gemma Kulk ◽  
Trevor Platt ◽  
James Dingle ◽  
Thomas Jackson ◽  
Bror F. Jönsson ◽  
...  
Keyword(s):  
Primary Production ◽  
Environmental Variables ◽  
Linear Trend ◽  
In Situ Measurements ◽  
Marine Phytoplankton ◽  
Initial Slope ◽  
Model Parameters ◽  
Photosynthetic Parameters ◽  
Photosynthetic Response

Primary production by marine phytoplankton is one of the largest fluxes of carbon on our planet. In the past few decades, considerable progress has been made in estimating global primary production at high spatial and temporal scales by combining in situ measurements of primary production with remote-sensing observations of phytoplankton biomass. One of the major challenges in this approach lies in the assignment of the appropriate model parameters that define the photosynthetic response of phytoplankton to the light field. In the present study, a global database of in situ measurements of photosynthesis versus irradiance (P-I) parameters and a 20-year record of climate quality satellite observations were used to assess global primary production and its variability with seasons and locations as well as between years. In addition, the sensitivity of the computed primary production to potential changes in the photosynthetic response of phytoplankton cells under changing environmental conditions was investigated. Global annual primary production varied from 38.8 to 42.1 Gt C yr − 1 over the period of 1998–2018. Inter-annual changes in global primary production did not follow a linear trend, and regional differences in the magnitude and direction of change in primary production were observed. Trends in primary production followed directly from changes in chlorophyll-a and were related to changes in the physico-chemical conditions of the water column due to inter-annual and multidecadal climate oscillations. Moreover, the sensitivity analysis in which P-I parameters were adjusted by ±1 standard deviation showed the importance of accurately assigning photosynthetic parameters in global and regional calculations of primary production. The assimilation number of the P-I curve showed strong relationships with environmental variables such as temperature and had a practically one-to-one relationship with the magnitude of change in primary production. In the future, such empirical relationships could potentially be used for a more dynamic assignment of photosynthetic rates in the estimation of global primary production. Relationships between the initial slope of the P-I curve and environmental variables were more elusive.

In situ measurements confirm the seasonal dominance of benthic algae over phytoplankton in nearshore primary production of a large lake

2010 ◽  
Vol 55 (12) ◽  
pp. 2468-2483 ◽  
Author(s):  
SAIRAH Y. MALKIN ◽  
SERGHEI A. BOCANIOV ◽  
RALPH E. SMITH ◽  
STEPHANIE J. GUILDFORD ◽  
ROBERT E. HECKY
Keyword(s):  
Primary Production ◽  
Benthic Algae ◽  
In Situ Measurements ◽  
Large Lake

scholarly journals In situ measurements of benthic primary production, respiration and nutrient fluxes in a hypersaline coastal lagoon of SE Brazil

1996 ◽  
Vol 44 (2) ◽  
Author(s):  
Bastiaan Knoppers ◽  
Weber Friederichs Landim de Souza ◽  
Marcelo Friederichs Landim de Souza ◽  
Eliane Gonzalez Rodriguez ◽  
Elisa de Fátima da Cunha Vianna Landim ◽  
...  
Keyword(s):  
Primary Production ◽  
Coastal Lagoon ◽  
In Situ Measurements ◽  
Nutrient Fluxes ◽  
Benthic Primary Production ◽  
Se Brazil ◽  
Hypersaline Coastal Lagoon
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