Zobrazeno 1 - 10
of 94
pro vyhledávání: '"L. L. Sørensen"'
Publikováno v:
Atmospheric Chemistry and Physics, Vol 23, Pp 15365-15373 (2023)
In this study, we analyze the transition of a stable atmospheric boundary layer (ABL) with a low-level jet (LLJ) to a traditional stable ABL with a classic Ekman helix in the late-winter central Arctic. Vertical profiles in the ABL were measured with
Externí odkaz:
https://doaj.org/article/9baf71a381864c1cb3e4d58f3e445c58
Publikováno v:
Atmospheric Chemistry and Physics, Vol 18, Pp 6923-6938 (2018)
Measurements of gaseous elemental mercury (GEM) fluxes over snow surfaces using a relaxed eddy accumulation (REA) system are carried out at the High Arctic site at the Villum Research Station, Station Nord, in North Greenland. Simultaneously, CO2
Externí odkaz:
https://doaj.org/article/b0ed1267051d4f49af1450696c98f752
Autor:
Q. T. Nguyen, M. Glasius, L. L. Sørensen, B. Jensen, H. Skov, W. Birmili, A. Wiedensohler, A. Kristensson, J. K. Nøjgaard, A. Massling
Publikováno v:
Atmospheric Chemistry and Physics, Vol 16, Pp 11319-11336 (2016)
This work presents an analysis of the physical properties of sub-micrometer aerosol particles measured at the high Arctic site Villum Research Station, Station Nord (VRS), northeast Greenland, between July 2010 and February 2013. The study focuses
Externí odkaz:
https://doaj.org/article/96162c64eb3845a2821a0087b1499753
Autor:
J. Sievers, L. L. Sørensen, T. Papakyriakou, B. Else, M. K. Sejr, D. Haubjerg Søgaard, D. Barber, S. Rysgaard
Publikováno v:
The Cryosphere, Vol 9, Iss 4, Pp 1701-1713 (2015)
Eddy covariance observations of CO2 fluxes were conducted during March–April 2012 in a temporally sequential order for 8, 4 and 30 days, respectively, at three locations on fast sea ice and on newly formed polynya ice in a coastal fjord environment
Externí odkaz:
https://doaj.org/article/eff43699994940f3990c06978806237d
Autor:
A. Massling, I. E. Nielsen, D. Kristensen, J. H. Christensen, L. L. Sørensen, B. Jensen, Q. T. Nguyen, J. K. Nøjgaard, M. Glasius, H. Skov
Publikováno v:
Atmospheric Chemistry and Physics, Vol 15, Iss 16, Pp 9681-9692 (2015)
Measurements of equivalent black carbon (EBC) in aerosols at the high Arctic field site Villum Research Station (VRS) at Station Nord in North Greenland showed a seasonal variation in EBC concentrations with a maximum in winter and spring at ground l
Externí odkaz:
https://doaj.org/article/3ab2c533409b4b0fb528814ef99ed999
Autor:
A. S. Lansø, J. Bendtsen, J. H. Christensen, L. L. Sørensen, H. Chen, H. A. J. Meijer, C. Geels
Publikováno v:
Biogeosciences, Vol 12, Iss 9, Pp 2753-2772 (2015)
Minimising the uncertainties in estimates of air–sea CO2 exchange is an important step toward increasing the confidence in assessments of the CO2 cycle. Using an atmospheric transport model makes it possible to investigate the direct impact of atmo
Externí odkaz:
https://doaj.org/article/67a3663b4eec46889573ba7a368a7e8a
Autor:
J. Sievers, T. Papakyriakou, S. E. Larsen, M. M. Jammet, S. Rysgaard, M. K. Sejr, L. L. Sørensen
Publikováno v:
Atmospheric Chemistry and Physics, Vol 15, Iss 4, Pp 2081-2103 (2015)
Estimating representative surface fluxes using eddy covariance leads invariably to questions concerning inclusion or exclusion of low-frequency flux contributions. For studies where fluxes are linked to local physical parameters and up-scaled through
Externí odkaz:
https://doaj.org/article/62ee66cfe46144a5ace14081eafa7f58
Autor:
S. Rysgaard, F. Wang, R. J. Galley, R. Grimm, D. Notz, M. Lemes, N.-X. Geilfus, A. Chaulk, A. A. Hare, O. Crabeck, B. G. T. Else, K. Campbell, L. L. Sørensen, J. Sievers, T. Papakyriakou
Publikováno v:
The Cryosphere, Vol 8, Iss 4, Pp 1469-1478 (2014)
Ikaite (CaCO3 · 6H2O) is a metastable phase of calcium carbonate that normally forms in a cold environment and/or under high pressure. Recently, ikaite crystals have been found in sea ice, and it has been suggested that their precipitation may play
Externí odkaz:
https://doaj.org/article/c1c1adab077e4cf4a0c0b9a3aa0feb90
Autor:
L. L. Sørensen, B. Jensen, R. N. Glud, D. F. McGinnis, M. K. Sejr, J. Sievers, D. H. Søgaard, J.-L. Tison, S. Rysgaard
Publikováno v:
The Cryosphere, Vol 8, Iss 3, Pp 853-866 (2014)
We suggest the application of a flux parameterization commonly used over terrestrial areas for calculation of CO2 fluxes over sea ice surfaces. The parameterization is based on resistance analogy. We present a concept for parameterization of the CO2
Externí odkaz:
https://doaj.org/article/1265643aece842bc8139b1a8d8ae0e5a
Publikováno v:
Biogeosciences, Vol 10, Iss 7, Pp 4577-4589 (2013)
The understanding of biochemical feedback mechanisms in the climate system is lacking knowledge in relation to bi-directional ammonia (NH3) exchange between natural ecosystems and the atmosphere. We therefore study the atmospheric NH3 fluxes during a
Externí odkaz:
https://doaj.org/article/267ff6a84dda4a1ab012043bf8c9b84d