Seasonal variations in emission rates and composition of terpenoids emitted from Chamaecyparis formosensis (Cupressaceae) of different ages

2019 ◽  
Vol 142 ◽  
pp. 405-414 ◽  
Author(s):  
Ying-Ju Chen ◽  
Chun-Ya Lin ◽  
Huai-Wan Hsu ◽  
Chen-Ying Yeh ◽  
Yu-Han Chen ◽  
...  
Keyword(s):  
Seasonal Variations ◽  
Emission Rates ◽  
Different Ages ◽  
Chamaecyparis Formosensis

Seasonal variations of monoterpene emissions from coniferous trees of different ages in Korea

Chemosphere ◽  
2005 ◽  
Vol 59 (11) ◽  
pp. 1685-1696 ◽  
Author(s):  
Jo-Chun Kim ◽  
Ki-Joon Kim ◽  
Deug-Soo Kim ◽  
Jin-Seok Han
Keyword(s):  
Seasonal Variations ◽  
Coniferous Trees ◽  
Different Ages

scholarly journals Simulating precipitation decline under a Mediterranean deciduous Oak forest: effects on isoprene seasonal emissions and predictions under climatic scenarios

2017 ◽  
Author(s):  
Anne-Cyrielle Genard-Zielinski ◽  
Christophe Boissard ◽  
Elena Ormeño ◽  
Juliette Lathière ◽  
Ilja M. Reiter ◽  
...  
Keyword(s):  
Water Stress ◽  
Seasonal Variations ◽  
Land Surface ◽  
Environmental Changes ◽  
Seasonal Pattern ◽  
Land Surface Model ◽  
Surface Model ◽  
Emission Rates ◽  
Drought Intensity ◽  
Isoprene Emission

Abstract. Seasonal variations of Q. pubescens physiology and isoprene emission rates (ER) were studied from June 2012 to June 2013 at the O3HP site (French Mediterranean) under natural (ND) and amplified (+30 %, AD) drought. While AD significantly reduced the stomatal conductance to water vapour over the season excepting August, it did not significantly limit CO2 net assimilation, which was the lowest in summer. ER followed a significant seasonal pattern, whatever the drought intensity, with mean ER maxima of 78.5 and 104.8 µgC gDM−1 h−1 in July (ND) and August (AD) respectively. Isoprene emission factor increased significantly by a factor of 2 in August and September under AD (137.8 and 74.3 µgC gDM−1 h−1) compared to ND (75.3 and 40.21 µgC gDM−1 h−1), but no changes occurred on ER. An isoprene algorithm (G14) was developed using an optimised artificial neural network trained on our experimental dataset (ER + O3HP climatic and edaphic parameters cumulated over 0 to 21 days before measurements). G14 assessed more than 80 % of the observed ER seasonal variations, whatever the drought intensity. In contrast, ER was poorly assessed under water stress by MEGAN empirical isoprene model, in particular under AD. Soil water (SW) content was the dominant parameter to account for the observed ER variations, regardless the water stress treatment. ER was more sensitive to higher frequency environmental changes under AD (0 to −7 days) compared to ND (7 days). Using IPCC RCP2.6 and RCP8.5 climate scenarios, SW and temperature calculated by the ORCHIDEE land surface model, and G14, an annual 3 fold ER relative increase was found between present (2000–2010) and future (2090–2100) for RCP8.5 scenario compared to a 70 % increase for RCP2.6. Future ER remained mainly sensitive to SW (both scenarios) and became dependent to higher frequency environmental changes under RCP8.5.

scholarly journals Seasonal variations of O<sub>2</sub> atmospheric and OH(6−2) airglowand temperature at mid-latitudes from SATI observations

2004 ◽  
Vol 22 (3) ◽  
pp. 819-828 ◽  
Author(s):  
M. J. López-González ◽  
E. Rodríguez ◽  
R. H. Wiens ◽  
G. G. Shepherd ◽  
S. Sargoytchev ◽  
...  
Keyword(s):  
Seasonal Variation ◽  
Key Words ◽  
Sierra Nevada ◽  
Seasonal Variations ◽  
Annual Variation ◽  
Emission Rate ◽  
Atmospheric Composition ◽  
Emission Rates ◽  
Composition And Structure ◽  
Instruments And Techniques

Abstract. More than 3 years of airglow observations with a Spectral Airglow Temperature Imager (SATI) installed at the Sierra Nevada Observatory (37.06°N, 3.38°W) at 2900m height have been analyzed. Values of the column emission rate and vertically averaged temperature of the O2 atmospheric (0–1) band and of the OH Meinel (6–2) band from 1998 to 2002 have been presented. From these observations a clear seasonal variation of both emission rates and rotational temperatures is inferred at this latitude. It is found that the annual variation of the temperatures is larger than the semi-annual variation, while for the emission rates the amplitudes are comparable. Key words. Atmospheric composition and structure (airglow and aurora; pressure density and temperature; instruments and techniques)

Exposure level and emission characteristics of ammonia and hydrogen sulphide in poultry buildings of South Korea

2016 ◽  
Vol 26 (8) ◽  
pp. 1168-1176
Author(s):  
Ki Y. Kim
Keyword(s):  
South Korea ◽  
Hydrogen Sulphide ◽  
Seasonal Variations ◽  
Emission Rate ◽  
Field Investigation ◽  
Exposure Level ◽  
Emission Characteristics ◽  
Emission Rates ◽  
Building Area ◽  
Broiler House

The purpose of this study is to estimate the concentrations and emission rates of ammonia and hydrogen sulphide released from poultry buildings situated in South Korea by field investigation. Mean concentrations of ammonia and hydrogen sulphide emitted from poultry buildings were 18.8 (±4.90) ppm and 945 (±519) ppb for caged layer house, 15.2 (±3.21) ppm and 603 (±274) ppb for broiler house, and 6.45 (±1.85) ppm and 247 (±184) ppb for layer house with manure belt, respectively. Seasonal variations in concentrations of ammonia and hydrogen sulphide in poultry building were observed highest in winter, lowest in summer (p < 0.01). Based on animal unit (AU), mean emission rates of ammonia and hydrogen sulphide were 4493 (±2095) mg AU−1 h−1 and 4493 (±2095) mg AU−1 h−1, respectively. Those of ammonia and hydrogen sulphide in terms of poultry building area were 278 (±130) mg m−2 h−1 and 12.3 (±9.20) mg m−2 h−1, respectively. Exposure level and emission rate of ammonia and hydrogen sulphide were highest in caged layer house, followed by broiler house and layer house with manure belt (p < 0.05). This finding implicates that the caged layer house among types of poultry building in South Korea should be managed optimally to lessen generation of ammonia and hydrogen sulphide.

25-OH vitamin D and PTH seasonal variations at different ages

Bone ◽  
2011 ◽  
Vol 48 ◽  
pp. S148
Author(s):  
A. De Remigis ◽  
V. Corazzini ◽  
C. De Leonibus ◽  
S. Matera ◽  
P. De Remigis ◽  
...  
Keyword(s):  
Vitamin D ◽  
Seasonal Variations ◽  
Different Ages ◽  
25 Oh Vitamin D

Seasonal variations in VOC emission rates from gorse (Ulex europaeus)

2001 ◽  
Vol 35 (5) ◽  
pp. 917-927 ◽  
Author(s):  
C Boissard ◽  
X.-L Cao ◽  
C.-Y Juan ◽  
C.N Hewitt ◽  
M Gallagher
Keyword(s):  
Seasonal Variations ◽  
Emission Rates ◽  
Voc Emission ◽  
Ulex Europaeus

Particulate Matter Concentrations and Emission Rates at Two Retrofitted Manure-Belt Layer Houses

2021 ◽  
Vol 64 (3) ◽  
pp. 829-841
Author(s):  
Reyna M. Knight ◽  
Xinjie Tong ◽  
Lingying Zhao ◽  
Roderick B. Manuzon ◽  
Matthew J. Darr ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Ambient Temperature ◽  
Seasonal Variations ◽  
Egg Production ◽  
Ventilation Rate ◽  
Diurnal Variations ◽  
List Type ◽  
Emission Rates ◽  
Annual Average ◽  
Seasonal And Diurnal Variations

HighlightsAnnual average PM10 (daily) and PM2.5 (hourly) concentrations of 509 ±203 and 43.3 ±36.1 µg m-3, respectively.Significant seasonal and diurnal variations in PM concentrations; higher in colder seasons and during daytime.Annual average PM10 (daily) and PM2.5 (hourly) emission rates of 17.9 ±9.6 and 1.41 ±1.53 mg d-1 hen-1, respectively.Significant diurnal variations in PM emission rates but inconsistent seasonal variations; higher during daytime.Abstract. Particulate matter (PM) concentration and emission rate information is needed to assess air quality concerns and environmental impacts related to egg production. Many egg layer buildings were retrofitted from high-rise to manure-belt houses over the past few decades. However, no studies have reported these PM data for the retrofitted layer houses. In this study, concentrations and emission rates of PM10 and PM2.5 were continuously monitored for 12 months at two commercial retrofitted manure-belt layer houses in the Midwestern U.S. The average daily mean PM10 and average hourly mean PM2.5 concentrations in the houses were 509 ±203 µg m-3 and 43.3 ±36.1 µg m-3, respectively. Significant seasonal and diurnal variations in PM concentrations were observed, with higher concentrations in colder seasons and during daytime. The average daily mean PM10 and average hourly mean PM2.5 emission rates from the two houses were 17.9 ±9.6 mg d-1 hen-1 and 1.41 ±1.53 mg d-1 hen-1, respectively. There were no consistent patterns in seasonal variations. Significant diurnal variations were also observed for PM emission rates, with higher PM emission rates observed during daytime. The PM concentrations were significantly correlated with ambient temperature, ventilation rate, bird age, egg production, daily mortality, and feed conversion ratio, while PM emission rates were significantly correlated with ambient temperature, bird age, bird mass, egg mass, and ventilation rate. Keywords: Diurnal variation, Dust, Egg production, PM, Poultry, Seasonal variation.

Seasonal variations in AADSAS applicants

1985 ◽  
Vol 49 (6) ◽  
pp. 445-447
Author(s):  
E Solomon ◽  
D Stoll
Keyword(s):  
Seasonal Variations
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