Prof Patrick Crill
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Contracts (13)
Collaborating with (9)
Apportionment of natural versus anthropogenic sources of halocarbons depleting Arctic ozone: Novel applications of powerful halocarbon-specific analysis of d37Cl, d81Br and D14C isotopes
Period: 1/1/08 - 12/31/10
Halogenated volatile organic compounds (HVOC) such as CH3Br, CH3Cl and CHBr3 have a mix of natural and anthropogenic sources and stand for a poorly constrained contribution (25-50%?) of halogen-induced ozone depletion in the Arctic atmosphere. Source-diagnostic dual-isotopic fingerprint of these ...
Boreal forest methane exchange – sink and/or source?
Period: 1/1/07 - 12/31/08
In a recent article in Nature it was shown that methane can be emitted from plants under aerobic conditions and that the process was abiotic. The estimated possible contribution to the global budget was substantial, between 10-30%. If the results holds, then all methane budgets estimated so fas has ...
Carbon Gas Exchange in a Climate Sensitive Subarctic Landscape: Contribution of Lakes to Mire Complex Fluxes
Period: 1/1/08 - 12/31/10
Seasonally and permanently frozen peatlands and their associated ponds and lakes at high latitudes represent an important challenge in our understanding of atmosphere biosphere interactions and climate land surface feedbacks both mediated by low molecular weight carbon (C) gas exchange with a focus ...
DEFROST Nordic Centre of Excellence
Period: 11/1/10 - 10/31/15
The recent years have seen a number of dramatic changes in the Arctic cryosphere. Some of these changes have exceeded the most aggressive projections, such as the record melt of sea ice in summer 2007, the major melt off around the edges of the Greenland Ice Sheet and extensive and previously ...
Distinguishing Arctic CH4 Sources to the Atmosphere Using Inverse Analysis of High Frequency CH4, 13CH4 and CH3D Measurements: IZOMET-FS
Period: 1/1/15 - 12/31/17
Den pågående globala uppvärmningen förväntas bli mer omfattande i arktiska regioner än på andra ställen i världen. Metan (CH4), den näst viktigaste växthusgasen i atmosfären, har potentiellt stora men också osäkra källor i Arktis. Det är viktigt att dels minska osäkerheterna för de totala arktiska ...
Exchanges of biogenic volatile organic carbon compounds in relation to fluxes of carbon (CO2, CH4) and climate in representative Swedish ecosystems
Period: 1/1/06 - 12/31/06
In the latest IPCC report the exchange of biogenic volatile organic compounds (BVOCs) were identified as representing some of the greatest unknowns with respect to their impact on the climate system. The impact of the BVOCs may be on the order of magnitude of the combined effect of CO2, CH4 and N2O ...
H2 formation and release during temporary anoxic periods in soils – an unanticipated process with implications for the residence of greenhouse gases in the atmosphere
Period: 1/1/08 - 12/31/10
Molecular hydrogen (H2) plays an important role in atmospheric oxidation/reduction chemistry due to its reactions with OH and as a source of water vapor to the troposphere and stratosphere. This makes H2 an indirect greenhouse gas. However, the atmospheric source/sink relationships controlling its ...
Landscape Greenhouse Gas Exchange (LAGGE) - Integration of Terrestrial and Freshwater sources and sinks
Period: 11/1/10 - 12/31/13
The current accounting of forests as carbon sinks has relied on measurements of vertical carbon dioxide (CO2) exchange between vegetation and the atmosphere. The budgets have ignored dissolved carbon (C) and nitrogen (N) transport in water to streams and lakes and the subsequent exchange between ...
Methane exchange in boreal forests - narrowing ununcertainties in the total greenhouse gas budget
Period: 1/1/09 - 12/31/11
It is well known that well aerated soils are sinks for methane. There is however a considerable unceratainty regarding the magnitude and more studies are needed in e.g., boreal forests. A couple of years ago an article was published in Nature showing that plants actually produce methane under ...
Quantifying the Carbon budget in Northern Russia: past, present and future
Period: 11/1/06 - 4/30/10
CARBO-North aims at quantifying the carbon budget in Northern Russia across temporal and spatial scales. Activities address rates of ecosystem change, effects on the carbon budget (radiative forcing), and global climate and policy implications (Kyoto). Recent research on the impacts of climate ...