Seasonal trends of dry and bulk concentration of nitrogen compounds over a rain forest in Ghana

Fattore, F.; Bertolini, T.; Materia, Stefano; Gualdi, Silvio; M’Bou, Armel Thongo; Nicolini, Giacomo; Валентини, Р.; Grandcourt, A. de; Tedesco, Dario; Castaldi, Simona

doi:10.5194/bg-11-3069-2014

Cited by 9 publications

(3 citation statements)

References 61 publications

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“…We found FLUXCOM consistently underestimated both Amazonia and West African forests GPP (Figure 4), and MODIS GPP was even lower. It seems likely that dynamic vegetation models also underestimate West African forests GPP because previous studies involving our wet rainforest site Ankasa 19,20 found model GPP estimates lower than the flux-tower GPP (yearly mean varying from 22 to 36 MgC/ha/year) that is smaller than in-situ biometric measurements (40.1 MgC/ha/year) [35][36][37] . The above synthesis reveals an acute data-model discrepancy in tropical forests productivity estimates, especially for West African forests, which require more detailed investigation.…”

Section: Amazonia and West Africamentioning

confidence: 83%

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Contrasting carbon cycle along tropical forest aridity gradients in W Africa and Amazonia

Zhang-Zheng,

Adu-Bredu,

Duah-Gyamfi

et al. 2023

Preprint

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Tropical forests cover large areas of equatorial Africa and play a significant role in the global carbon cycle. However, there has been a lack of in-situ measurements to understand the forests’ gross and net primary productivity (GPP and NPP) and their allocation. Here we present the first detailed field assessment of the carbon budget of multiple forest sites in Africa, by monitoring 14 one-hectare plots along an aridity gradient in Ghana. When compared with an equivalent aridity gradient in Amazonia using the same measurement protocol, the studied West African forests generally had higher GPP and NPP and lower carbon use efficiency (CUE). The West African aridity gradient consistently shows the highest NPP, CUE, GPP, and autotrophic respiration at a medium-aridity site, Bobiri. Notably, NPP and GPP of the site are the highest yet reported anywhere in the tropics using similar methods. Widely used data products (MODIS and FLUXCOM) substantially underestimate productivity when compared to in situ measurements, in Amazonia and especially in Africa. Our analysis suggests that the high productivity of the African forests is linked to their large GPP allocation to canopy and semi-deciduous characteristics , which may be a result of a seasonal climate coupled with high soil fertility.

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Section: Amazonia and West Africamentioning

confidence: 83%

“…For example, GPP can be estimated by non-biometric methods, such as eddy covariance tower measurements and remote sensing. However, in the entire African tropical forest region, there was only one eddy covariance tower (in Ankasa, Ghana), reporting three years of GPP (2011-2014) 19,20 .…”

Section: Introductionmentioning

confidence: 99%

Contrasting carbon cycle along tropical forest aridity gradients in W Africa and Amazonia

Zhang-Zheng,

Adu-Bredu,

Duah-Gyamfi

et al. 2023

Preprint

Self Cite

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“…This value is close to concentrations measured at residential (21.9 ± 5.2 ppb) and industrial (20.7 ± 0.7 ppb) sites. Ammonia concentrations measured in Abidjan are very high compared to the concentrations measured in rural African environments, where concentrations range from 1 to 9 ppb (Adon et al, 2010;Carmichael et al, 2003;Fattore et al, 2014;Martins et al, 2007), and are similar to concentrations found near agriculture sources.…”

Section: Ammonia (Nh 3 )mentioning

confidence: 59%

A pilot study of gaseous pollutants' measurement (NO2, SO2, NH3, HNO3 and O3) in Abidjan, Côte d'Ivoire: contribution to an overview of gaseous pollution in African cities

Bahino¹,

Yoboue²,

Galy‐Lacaux

et al. 2018

Atmos. Chem. Phys.

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Abstract. This work is part of the DACCIWA FP7 project (Dynamics-Aerosol-Chemistry-Cloud Interactions in West Africa) in the framework of the Work Package 2 "Air Pollution and Health". This study aims to characterize urban air pollution levels through the measurement of NO 2 , SO 2 , NH 3 , HNO 3 and O 3 in Abidjan, the economic capital of Côte d'Ivoire. Measurements of inorganic gaseous pollutants, i.e. NO 2 , SO 2 , NH 3 , HNO 3 and O 3 were performed in Abidjan during an intensive campaign within the dry season (15 December 2015 to 16 February 2016), using INDAAF (International Network to study Deposition and Atmospheric chemistry in AFrica) passive samplers exposed in duplicate for 2-week periods. Twenty-one sites were selected in the district of Abidjan to be representative of various anthropogenic and natural sources of air pollution in the city. Results from this intensive campaign show that gas concentrations are strongly linked to surrounding pollution sources and show a high spatial variability. Also, NH 3 , NO 2 and O 3 gases were present at relatively higher concentrations at all the sites. NH 3 average concentrations varied between 9.1 ± 1.7 ppb at a suburban site and 102.1 ± 9.1 ppb at a domestic fires site. NO 2 mean concentration varied from 2.7 ± 0.1 ppb at a suburban site to 25.0 ± 1.7 ppb at an industrial site. Moreover, we measured the highest O 3 concentration at the two coastal sites of Gonzagueville and Félix-Houphouët-Boigny International Airport located in the southeast of the city, with average concentrations of 19.1 ± 1.7 and 18.8 ± 3.0 ppb, respectively. The SO 2 average concentration never exceeded 7.2 ± 1.2 ppb over all the sites, with 71.5 % of the sampling sites showing concentrations ranging between 0.4 and 1.9 ppb. The HNO 3 average concentration ranged between 0.2 and 1.4 ppb. All these results were combined with meteorological parameters to provide the first mapping of gaseous pollutants on the scale of the district of Abidjan using geostatistical analysis (ArcGIS software). Spatial distribution results emphasize the importance of the domestic fires source and the significant impact of the traffic emissions on the scale of the city. In addition, in this work we propose a first overview of gaseous SO 2 and NO 2 concentrations on the scale of several African cities by comparing literature to our values. The daily SO 2 standard of World Health Organization (WHO) is exceeded in most of the cities reported in the overview, with concentrations ranging from 0.2 to 3662 µg m −3 . Annual NO 2 concentrations ranged from 2 to 175 µg m −3 , which are lower than the WHO threshold. As a conclusion, this study constitutes an original database to characterize urban air pollution and a first attempt towards presenting a spatial distribution of the pollution levels at the scale of the metropolis of Abidjan. This work should draw the attention of the African public authorities to the necessity of building an air quality monitoring network in order to (1) to define national standards and to bette...

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DRY and BULK atmospheric nitrogen deposition to a West-African humid forest exposed to terrestrial and oceanic sources

Bertolini

Fléchard

Fattore

et al. 2016

Agricultural and Forest Meteorology

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Seasonal trends of dry and bulk concentration of nitrogen compounds over a rain forest in Ghana

Cited by 9 publications

References 61 publications

Contrasting carbon cycle along tropical forest aridity gradients in W Africa and Amazonia

Contrasting carbon cycle along tropical forest aridity gradients in W Africa and Amazonia

A pilot study of gaseous pollutants' measurement (NO<sub>2</sub>, SO<sub>2</sub>, NH<sub>3</sub>, HNO<sub>3</sub> and O<sub>3</sub>) in Abidjan, Côte d'Ivoire: contribution to an overview of gaseous pollution in African cities

DRY and BULK atmospheric nitrogen deposition to a West-African humid forest exposed to terrestrial and oceanic sources

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Seasonal trends of dry and bulk concentration of nitrogen compounds over a rain forest in Ghana

Cited by 9 publications

References 61 publications

Contrasting carbon cycle along tropical forest aridity gradients in W Africa and Amazonia

Contrasting carbon cycle along tropical forest aridity gradients in W Africa and Amazonia

A pilot study of gaseous pollutants' measurement (NO&lt;sub&gt;2&lt;/sub&gt;, SO&lt;sub&gt;2&lt;/sub&gt;, NH&lt;sub&gt;3&lt;/sub&gt;, HNO&lt;sub&gt;3&lt;/sub&gt; and O&lt;sub&gt;3&lt;/sub&gt;) in Abidjan, Côte d'Ivoire: contribution to an overview of gaseous pollution in African cities

DRY and BULK atmospheric nitrogen deposition to a West-African humid forest exposed to terrestrial and oceanic sources

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Product

Resources

About

A pilot study of gaseous pollutants' measurement (NO<sub>2</sub>, SO<sub>2</sub>, NH<sub>3</sub>, HNO<sub>3</sub> and O<sub>3</sub>) in Abidjan, Côte d'Ivoire: contribution to an overview of gaseous pollution in African cities