The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
H. Hakola - One of the best experts on this subject based on the ideXlab platform.
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A new Feedback Mechanism linking forests, aerosols, and climate
Atmospheric Chemistry and Physics Discussions, 2003Co-Authors: Markku Kulmala, K E J Lehtinen, T. Suni, Miikka Dal Maso, M. Boy, Anni Reissell, Pami Aalto, P. Keronen, Ullar Rannik, H. HakolaAbstract:Among significant issues in climate change studies are the possible connections between the carbon balance of ecosystems and aerosol-cloud-climate interactions. Carbon dioxide is a greenhouse gas, whereas the net effect of atmospheric aerosols is to cool the climate. Here, we investigated the connection between forest-atmosphere carbon exchange and aerosol dynamics in the continental boundary layer by means of multiannual data sets of particle formation and growth rates, of CO2 fluxes, and of monoterpene concentrations in a Scots pine forest in southern Finland. We suggest a new, interesting link and a potentially important Feedback among forest ecosystem functioning, aerosols, and climate: Considering that globally increasing temperatures and CO2 fertilization are likely to lead to increased photosynthesis and forest growth, an increase in forest biomass would increase emissions of non-methane biogenic volatile organic compounds and thereby enhance organic aerosol production. This Feedback Mechanism couples the climate effect of CO2 with that of aerosols in a novel way.
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a new Feedback Mechanism linking forests aerosols and climate
Atmospheric Chemistry and Physics, 2003Co-Authors: Markku Kulmala, K E J Lehtinen, T. Suni, Anni Reissell, Pami Aalto, P. Keronen, Ullar Rannik, Dal M Maso, H. HakolaAbstract:The possible connections between the carbon balance of ecosystems and aerosol-cloud-climate interactions play a significant role in climate change studies. Carbon dioxide is a greenhouse gas, whereas the net effect of atmospheric aerosols is to cool the climate. Here, we investigated the connection between forest-atmosphere carbon exchange and aerosol dynamics in the continental boundary layer by means of multiannual data sets of particle formation and growth rates, of CO 2 fluxes, and of monoterpene concentrations in a Scots pine forest in southern Finland. We suggest a new, interesting link and a potentially important Feedback among forest ecosystem functioning, aerosols, and climate: Considering that globally increasing temperatures and CO 2 fertilization are likely to lead to increased photosynthesis and forest growth, an increase in forest biomass would increase emissions of non-methane biogenic volatile organic compounds and thereby enhance organic aerosol production. This Feedback Mechanism couples the climate effect of CO 2 with that of aerosols in a novel way.
Anni Reissell - One of the best experts on this subject based on the ideXlab platform.
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A new Feedback Mechanism linking forests, aerosols, and climate
Atmospheric Chemistry and Physics Discussions, 2003Co-Authors: Markku Kulmala, K E J Lehtinen, T. Suni, Miikka Dal Maso, M. Boy, Anni Reissell, Pami Aalto, P. Keronen, Ullar Rannik, H. HakolaAbstract:Among significant issues in climate change studies are the possible connections between the carbon balance of ecosystems and aerosol-cloud-climate interactions. Carbon dioxide is a greenhouse gas, whereas the net effect of atmospheric aerosols is to cool the climate. Here, we investigated the connection between forest-atmosphere carbon exchange and aerosol dynamics in the continental boundary layer by means of multiannual data sets of particle formation and growth rates, of CO2 fluxes, and of monoterpene concentrations in a Scots pine forest in southern Finland. We suggest a new, interesting link and a potentially important Feedback among forest ecosystem functioning, aerosols, and climate: Considering that globally increasing temperatures and CO2 fertilization are likely to lead to increased photosynthesis and forest growth, an increase in forest biomass would increase emissions of non-methane biogenic volatile organic compounds and thereby enhance organic aerosol production. This Feedback Mechanism couples the climate effect of CO2 with that of aerosols in a novel way.
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a new Feedback Mechanism linking forests aerosols and climate
Atmospheric Chemistry and Physics, 2003Co-Authors: Markku Kulmala, K E J Lehtinen, T. Suni, Anni Reissell, Pami Aalto, P. Keronen, Ullar Rannik, Dal M Maso, H. HakolaAbstract:The possible connections between the carbon balance of ecosystems and aerosol-cloud-climate interactions play a significant role in climate change studies. Carbon dioxide is a greenhouse gas, whereas the net effect of atmospheric aerosols is to cool the climate. Here, we investigated the connection between forest-atmosphere carbon exchange and aerosol dynamics in the continental boundary layer by means of multiannual data sets of particle formation and growth rates, of CO 2 fluxes, and of monoterpene concentrations in a Scots pine forest in southern Finland. We suggest a new, interesting link and a potentially important Feedback among forest ecosystem functioning, aerosols, and climate: Considering that globally increasing temperatures and CO 2 fertilization are likely to lead to increased photosynthesis and forest growth, an increase in forest biomass would increase emissions of non-methane biogenic volatile organic compounds and thereby enhance organic aerosol production. This Feedback Mechanism couples the climate effect of CO 2 with that of aerosols in a novel way.
Markku Kulmala - One of the best experts on this subject based on the ideXlab platform.
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A new Feedback Mechanism linking forests, aerosols, and climate
Atmospheric Chemistry and Physics Discussions, 2003Co-Authors: Markku Kulmala, K E J Lehtinen, T. Suni, Miikka Dal Maso, M. Boy, Anni Reissell, Pami Aalto, P. Keronen, Ullar Rannik, H. HakolaAbstract:Among significant issues in climate change studies are the possible connections between the carbon balance of ecosystems and aerosol-cloud-climate interactions. Carbon dioxide is a greenhouse gas, whereas the net effect of atmospheric aerosols is to cool the climate. Here, we investigated the connection between forest-atmosphere carbon exchange and aerosol dynamics in the continental boundary layer by means of multiannual data sets of particle formation and growth rates, of CO2 fluxes, and of monoterpene concentrations in a Scots pine forest in southern Finland. We suggest a new, interesting link and a potentially important Feedback among forest ecosystem functioning, aerosols, and climate: Considering that globally increasing temperatures and CO2 fertilization are likely to lead to increased photosynthesis and forest growth, an increase in forest biomass would increase emissions of non-methane biogenic volatile organic compounds and thereby enhance organic aerosol production. This Feedback Mechanism couples the climate effect of CO2 with that of aerosols in a novel way.
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a new Feedback Mechanism linking forests aerosols and climate
Atmospheric Chemistry and Physics, 2003Co-Authors: Markku Kulmala, K E J Lehtinen, T. Suni, Anni Reissell, Pami Aalto, P. Keronen, Ullar Rannik, Dal M Maso, H. HakolaAbstract:The possible connections between the carbon balance of ecosystems and aerosol-cloud-climate interactions play a significant role in climate change studies. Carbon dioxide is a greenhouse gas, whereas the net effect of atmospheric aerosols is to cool the climate. Here, we investigated the connection between forest-atmosphere carbon exchange and aerosol dynamics in the continental boundary layer by means of multiannual data sets of particle formation and growth rates, of CO 2 fluxes, and of monoterpene concentrations in a Scots pine forest in southern Finland. We suggest a new, interesting link and a potentially important Feedback among forest ecosystem functioning, aerosols, and climate: Considering that globally increasing temperatures and CO 2 fertilization are likely to lead to increased photosynthesis and forest growth, an increase in forest biomass would increase emissions of non-methane biogenic volatile organic compounds and thereby enhance organic aerosol production. This Feedback Mechanism couples the climate effect of CO 2 with that of aerosols in a novel way.
Fan-shuo Tseng - One of the best experts on this subject based on the ideXlab platform.
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VTC Fall - A Bit-Adaptive PMI Feedback Mechanism
2013 IEEE 78th Vehicular Technology Conference (VTC Fall), 2013Co-Authors: Chao-yuan Hsu, Ren-jr Chen, Fan-shuo TsengAbstract:A bit-adaptive precoding matrix index (PMI) Feedback Mechanism is proposed in Long Term Evolution-Advanced (LTE-A). In Coordinated Multipoint Transmission (CoMP) scenarios, the number of Feedback PMI bits for all channel state information (CSI) processes at the same time may be larger than that the current LTE-A system can support. However, in some environments like slow-fading channels, the number of Feedback PMI bits is thus reduced at the cost of limited performance loss without changing the codebook in LTE-A. To carry out this concept, we build up a candidate set for each PMI in the codebook of LTE-A. Based on the previous selected PMI, the current selected PMI belongs to the candidate set of the previous selected PMI. The candidate set is defined as a subset of precoder indices in the codebook of LTE-A. Since the number of elements in the candidate set is smaller than that of all precoders in the codebook, the number of Feedback PMI bits can be reduced. Simulations show that the Feedback PMI overhead can be reduced at the cost of limited performance loss. When the mobility speed is 20 km/h, the SNR loss is about 0.25 dB for block error rate is 10-2 and the overhead reduction ratio is 25%.
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A Bit-Adaptive PMI Feedback Mechanism
2013 IEEE 78th Vehicular Technology Conference (VTC Fall), 2013Co-Authors: Chao-yuan Hsu, Ren-jr Chen, Fan-shuo TsengAbstract:A bit-adaptive precoding matrix index (PMI) Feedback Mechanism is proposed in Long Term Evolution-Advanced (LTE-A). In Coordinated Multipoint Transmission (CoMP) scenarios, the number of Feedback PMI bits for all channel state information (CSI) processes at the same time may be larger than that the current LTE-A system can support. However, in some environments like slow-fading channels, the number of Feedback PMI bits is thus reduced at the cost of limited performance loss without changing the codebook in LTE-A. To carry out this concept, we build up a candidate set for each PMI in the codebook of LTE-A. Based on the previous selected PMI, the current selected PMI belongs to the candidate set of the previous selected PMI. The candidate set is defined as a subset of precoder indices in the codebook of LTE-A. Since the number of elements in the candidate set is smaller than that of all precoders in the codebook, the number of Feedback PMI bits can be reduced. Simulations show that the Feedback PMI overhead can be reduced at the cost of limited performance loss. When the mobility speed is 20 km/h, the SNR loss is about 0.25 dB for block error rate is 10-2 and the overhead reduction ratio is 25%.
Pami Aalto - One of the best experts on this subject based on the ideXlab platform.
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A new Feedback Mechanism linking forests, aerosols, and climate
Atmospheric Chemistry and Physics Discussions, 2003Co-Authors: Markku Kulmala, K E J Lehtinen, T. Suni, Miikka Dal Maso, M. Boy, Anni Reissell, Pami Aalto, P. Keronen, Ullar Rannik, H. HakolaAbstract:Among significant issues in climate change studies are the possible connections between the carbon balance of ecosystems and aerosol-cloud-climate interactions. Carbon dioxide is a greenhouse gas, whereas the net effect of atmospheric aerosols is to cool the climate. Here, we investigated the connection between forest-atmosphere carbon exchange and aerosol dynamics in the continental boundary layer by means of multiannual data sets of particle formation and growth rates, of CO2 fluxes, and of monoterpene concentrations in a Scots pine forest in southern Finland. We suggest a new, interesting link and a potentially important Feedback among forest ecosystem functioning, aerosols, and climate: Considering that globally increasing temperatures and CO2 fertilization are likely to lead to increased photosynthesis and forest growth, an increase in forest biomass would increase emissions of non-methane biogenic volatile organic compounds and thereby enhance organic aerosol production. This Feedback Mechanism couples the climate effect of CO2 with that of aerosols in a novel way.
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a new Feedback Mechanism linking forests aerosols and climate
Atmospheric Chemistry and Physics, 2003Co-Authors: Markku Kulmala, K E J Lehtinen, T. Suni, Anni Reissell, Pami Aalto, P. Keronen, Ullar Rannik, Dal M Maso, H. HakolaAbstract:The possible connections between the carbon balance of ecosystems and aerosol-cloud-climate interactions play a significant role in climate change studies. Carbon dioxide is a greenhouse gas, whereas the net effect of atmospheric aerosols is to cool the climate. Here, we investigated the connection between forest-atmosphere carbon exchange and aerosol dynamics in the continental boundary layer by means of multiannual data sets of particle formation and growth rates, of CO 2 fluxes, and of monoterpene concentrations in a Scots pine forest in southern Finland. We suggest a new, interesting link and a potentially important Feedback among forest ecosystem functioning, aerosols, and climate: Considering that globally increasing temperatures and CO 2 fertilization are likely to lead to increased photosynthesis and forest growth, an increase in forest biomass would increase emissions of non-methane biogenic volatile organic compounds and thereby enhance organic aerosol production. This Feedback Mechanism couples the climate effect of CO 2 with that of aerosols in a novel way.
