Boreal Forest
Summertime total OH reactivity measurements from boreal forest during HUMPPA-COPEC 2010
... day. Secondary products also exhibit maxima, both by day and night. For example pinic acid peaks at night, showing similar diel profile as its precursor monoterpene (Fig. 5). In contrast peak concentrations of PAN were ...
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The summertime Boreal forest field measurement intensive (HUMPPA-COPEC-2010): an overview of meteorological and chemical influences
... the Boreal forest field measurement intensive HUMPPA-COPEC 2010 (Hyyti¨al¨a United Measurement of Photochemistry and Particles – Comprehensive Organic Particle and Environmental Chem- ...the Boreal ...
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Determination of the biogenic secondary organic aerosol fraction in the boreal forest by NMR spectroscopy
... the Boreal forest with respect to that spent by the air masses arriving from ...the Boreal forest by the air masses reaching the site within C(W–NW) remains the most plausible explanation of ...
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Nanoparticles in boreal forest and coastal environment: a comparison of observations and implications of the nucleation mechanism
... tal conditions. Here we compare measurements from two very distinct environments: the boreal forest in Hyyti ¨al ¨a, southern Finland, and the coast of the North Atlantic Ocean, in Mace Head, Ireland. In ...
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Hygroscopicity, CCN and volatility properties of submicron atmospheric aerosol in a boreal forest environment during the summer of 2010
... Williams, J., Crowley, J., Fischer, H., Harder, H., Martinez, M., Petäjä, T., Rinne, J., Bäck, J., Boy, M., Dal Maso, M., Hakala, J., Kajos, M., Keronen, P., Rantala, P., Aalto, J., Aaltonen, H., Paatero, J., Vesals, T., ...
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Estimating seasonal variations in cloud droplet number concentration over the boreal forest from satellite observations
... using a chemical transport model that includes parameterizations of nucleation and condensational growth coupled to a simple radiation model. Another study that used a more conceptual approach to estimate the radiative ...
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Effects of lightning and other meteorological factors on fire activity in the North American boreal forest: implications for fire weather forecasting
... eastern domain, it is worth noting that such correlation analysis is done at the seasonal scale using averages over large regions (A and B) where considerable portions are not covered by the boreal forest. ...
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Observations of total RONO<sub>2</sub> over the boreal forest: NO<sub>x</sub> sinks and HNO<sub>3</sub> sources
... the boreal forest in Finland indicate substantial contributions from other monoter- penes as well as contributions from sesquiterpenes (Spirig et ...
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Composition and temporal behavior of ambient ions in the boreal forest
... Abstract. A recently developed atmospheric pressure in- terface mass spectrometer (APi-TOF) measured the negative and positive ambient ion composition at a boreal forest site. As observed in previous ...
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Comparing soil biogeochemical processes in novel and natural boreal forest ecosystems
... appear to develop into functioning forest ecosystems similar to those that occur natu- rally in this area after about 25 yr. Studies of chronosequences of reconstructed soils under similar tree canopies detected a ...
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Composition and temporal behavior of ambient ions in the boreal forest
... As observed in previous studies, the negative ions were dominated by strong organic and inorganic acids (e.g. malonic, nitric and sulfuric acid), whereas the positive ions.. consisted of[r] ...
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Determination of the biogenic secondary organic aerosol fraction in the boreal forest by AMS and NMR measurements
... Secondary organic aerosols (SOA), formed by gas-to-particle conversion of oxidized vapors, and other oxygenated organic aerosols formed by chemical ageing of existing particles (Fuzzi et[r] ...
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Overview of a prescribed burning experiment within a boreal forest in Finland
... atmosphere. Elevated concentrations of several VOCs (including acetonitrile which is a biomass burning marker) were observed in the smoke plume at ground level. The forest floor (i.e., richly organic layer of soil ...
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The impact of four decades of annual nitrogen addition on dissolved organic matter in a boreal forest soil
... To the contrary of our initial hypothesis, the concentration and the quality of DOC sam- pled in O horizon leachates did not change in response to long-term addition of min- eral N at the Str ˚asan experimental ...
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Snowpack concentrations and estimated fluxes of volatile organic compounds in a boreal forest
... model runs resulted in over 50 % air volume fractions for the snowpack during all measurement days in both winters and also for cases when the modelled snow grain type showed ice formation inside the snowpack. Thus, the ...
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Molecular composition of biogenic secondary organic aerosols using ultrahigh-resolution mass spectrometry: comparing laboratory and field studies
... the boreal forest site reasonably well, with ...the boreal forest aerosol compared to the pure α-pinene-SOA, the difference in the mean values among the treatment groups is not large enough to ...
13
Annual cycle of volatile organic compound exchange between a boreal pine forest and the atmosphere
... over boreal forests are rare, although the forests are known to emit considerable amounts of VOCs into the ...Scots-pine-dominated boreal forest semi-continuously between May 2010 and De- cember ...
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Seasonal variation in vertical volatile compounds air concentrations within a remote hemiboreal mixed forest
... We can conclude that the lower canopy is weakly mixed and rather stable during spring and summer leading to at least two clearly distinct layers within the canopy. Oxidative degradation processes inside the canopy may ...
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Constraining CO<sub>2</sub> emissions from open biomass burning by satellite observations of co-emitted species: a method and its application to wildfires in Siberia
... inventories were integrated over the same region and pe- riod as our emission estimates. Unfortunately, the GFED3.1 data for 2012 were not available for this study in view of the expected release of the GFED4.0 ...
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Methane emissions from boreal and tropical forest ecosystems derived from in-situ measurements
... temperature and water table levels. Nevertheless, bottom up estimates using in-situ field measurements are useful to get an idea about the possible contribution of partic- ular ecosystem types to the global budget. ...
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