搜索结果: 1-15 共查到“理学 boreal forest”相关记录29条 . 查询时间(0.062 秒)
Study:Alaskan boreal forest fires release more carbon than the trees can absorb
Alaskan boreal forest fires carbon trees
2015/11/12
A new analysis of fire activity in Alaska's Yukon Flats finds that so many forest fires are occurring there that the area has become a net exporter of carbon to the atmosphere. This is worrisome, the ...
APPLICABILITY OF FIRST PULSE DERIVED DIGITAL TERRAIN MODELS FOR BOREAL FOREST STUDIES
DTM quality first pulse last pulse laser scanning TIN grid
2015/8/13
Detailed high-resolution digital terrain models (DTM) can be obtained using airborne laser scanner data. This paper evaluates the
accuracy of DTM derived from first return of laser scanner data for f...
Tree species influence boreal forest fire behavior and subsequent effects on climate
Tree species boreal forest fire on climate
2015/3/4
For a better understanding of how forest fires behave and interact with climate, scientists are turning to the trees. A new study out of UC Irvine shows that differences in individual tree species bet...
Dominant Factors of the Nature Regulating CO2 Release from Boreal Forest Land
Fragmentation Global Warming High-Latitude Forest
2013/3/7
Temperature is often considered as a primary factor for microbial decomposition of soil organic carbon. Boreal forests are the large terrestrial carbon pool: if carbon stored in this region is transfe...
Composition and temporal behavior of ambient ions in the boreal forest
ambient ions the boreal forest
2010/9/21
A recently developed atmospheric pressure interface mass spectrometer (APi-TOF) measured the negative and positive ambient ion composition at a boreal forest site. As observed in previous studies, the...
Nanoparticles in boreal forest and coastal environment: a comparison of observations and implications of the nucleation mechanism
Nanoparticles boreal forest coastal environment the nucleation mechanism
2010/8/16
The detailed mechanism of secondary new particle formation in the atmosphere is still under debate. It is proposed that particle formation happens via activation of 1–2 nm atmospheric neutral molecula...
Effects of lightning and other meteorological factors on fire activity in the North American boreal forest: implications for fire weather forecasting
meteorological factors fire activity the North American boreal forest fire weather forecasting
2010/8/16
The effects of lightning and other meteorological factors on wildfire activity in the North American boreal forest are statistically analyzed during the fire seasons of 2000–2006 through an integratio...
Factors influencing the contribution of ion-induced nucleation in a boreal forest, Finland
ion-induced nucleation a boreal forest Finland
2010/8/12
We present the longest series of measurements so far (2 years and 7 months) made with an Ion-DMPS at the SMEAR II measurement station in Hyytiälä, Southern Finland. We show that the classifi...
VOC measurements within a boreal forest during spring 2005: on the occurrence of elevated monoterpene concentrations during night time intense particle concentration events
VOC measurements boreal forest monoterpene concentrations
2009/11/19
In this study we present measurements of selected trace gases and aerosols made in a boreal forest during the BACCI-QUEST IV intensive field campaign in Hyytiälä, Finland in April 2005. Spri...
Runoff Generating Processes in Boreal Forest Environments with Glacial Tills
Runoff Generating Processes Boreal Forest Environments Glacial Tills
2009/10/22
This review describes the processes by which runoff is generated from rain or
snowmelt in a boreal forest landscape with a shallow layer of glacial tills overlying
a relatively impermeable bedrock. ...
Sulfuric acid and OH concentrations in a boreal forest site
Sulfuric acid OH concentrations boreal forest site
2009/10/9
As demonstrated in a number of investigations, gaseous sulfuric acid plays a central role in atmospheric aerosol formation. Using chemical ionization mass spectrometer the gas-phase sulfuric acid and ...
Day-time concentrations of biogenic volatile organic compounds in a boreal forest canopy and their relation to environmental and biological factors
Day-time concentrations biogenic volatile organic compounds boreal forest canopy environmental and biological factors
2009/8/7
Atmospheric concentrations of methanol, acetaldehyde, acetone, isoprene and monoterpenes were measured using PTR-MS (proton transfer reaction mass spectrometry) in a boreal forest site in Hyytiäl...
Analysis of atmospheric neutral and charged molecular clusters in boreal forest using pulse-height CPC
atmospheric neutral molecular clusters boreal forest pulse-height CPC
2009/7/1
We measured the size distribution of atmospheric neutral and charged clusters and particles down to mobility diameter around 1.5 nm by applying pulse-height CPC technique at SMEAR II station in Hyyti&...
Applying the Condensation Particle Counter Battery（CPCB）——to study the water-affinity of freshly-formed 2–9 nm particles in boreal forest
CPCB water-affinity freshly-formed 2–9 nm particles boreal forest
2009/6/2
Measurements on the composition of nanometer-sized atmospheric particles are the key to understand which vapors participate in the secondary aerosol formation processes. Knowledge on these processes i...
Airborne measurements of nucleation mode particles II: boreal forest nucleation events
Airborne measurements nucleation mode particles boreal forest nucleation events
2009/3/13
Airborne measurements of nucleation mode aerosol concentrations during nucleation events over the boreal forest of southern Finland are reported. Three case studies are analyzed in an attempt to chara...