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Author |
Hanna Silvennoinen, Elena Kozlovskaya, Eduard Kissling |
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Title |
POLENET/LAPNET teleseismic P wave travel time tomography model of the upper mantle beneath northern Fennoscandia |
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Journal |
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2016 |
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Solid Earth |
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7 |
Issue |
2 |
Pages |
425-439 |
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1201 |
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1869-9510 |
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8165 |
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Author |
Olga Usoltseva, Elena Kozlovskaya |
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Title |
Studying local earthquakes in the area Baltic-Bothnia Megashear using the data of the POLENET/LAPNET temporary array |
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2016 |
Publication |
Solid Earth |
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Volume |
7 |
Issue |
4 |
Pages |
1095-1108 |
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1021 |
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1869-9510 |
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8168 |
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2011 |
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Solid Earth |
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2 |
Issue |
2 |
Pages |
303-313 |
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1021 |
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1869-9510 |
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8170 |
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Author |
Williams G D, Hindell M, Houssais M-N, Tamura T, Field I C, |
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Journal Article |
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Year |
2011 |
Publication |
Ocean Sci. |
Abbreviated Journal |
1812-0784 |
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Volume |
7 |
Issue |
2 |
Pages |
185-202 |
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452 |
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Copernicus Publications |
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1812-0792 |
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3603 |
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Author |
Philip L. Woodworth |
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Title |
The global distribution of the M1 ocean tide |
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Journal |
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Year |
2019 |
Publication |
Ocean Science |
Abbreviated Journal |
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Volume |
15 |
Issue |
2 |
Pages |
431-442 |
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Abstract |
The worldwide distribution of the small degree-3 M1 ocean tide is investigated using a quasi-global data set of over 800 tide gauge records and a global tide model. M1 is confirmed to have a geographical variation in the Atlantic consistent with the suggestion of Platzman (1984b) and Cartwright (1975) that M1 is generated in the ocean as a consequence of the spatial and temporal overlap of M1 in the tidal potential and one (or at least a small number of) diurnal ocean normal mode(s). As a consequence, it is particularly strong around the UK and on North Sea coasts (amplitudes ?10?mm). This analysis shows that their suggestion is also consistent to a great extent with the observed small amplitudes in the Pacific and Indian oceans. However, there are differences at the regional and local level which require much further study via more sophisticated ocean tidal modelling. By contrast, what is called the M1' tide (a combination of several degree-2 lines in the tidal potential with frequencies close to that of M1) is shown to have a geographical distribution consistent with expectations from other degree-2 diurnal tides, apart from locations such as around the UK where tidal interactions introduce complications. As far as I know, this is the first time that these small tidal constituents have been mapped on a global basis and, in particular, the first time that the ocean response to the degree-3 component of the tidal potential has been investigated globally. |
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688 |
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1812-0784 |
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yes |
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8615 |
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Author |
Biermann L, Guinet C, Bester M, Brierley A, Boehme L, |
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Title |
An alternative method for correcting fluorescence quenching |
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Journal Article |
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Year |
2015 |
Publication |
Ocean Sci. |
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Volume |
11 |
Issue |
1 |
Pages |
83-91 |
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Abstract |
Under high light intensity, phytoplankton protect their photosystems from bleaching through non-photochemical quenching processes. The consequence of this is suppression of fluorescence emission, which must be corrected when measuring in situ yield with fluorometers. We present data from the Southern Ocean, collected over five austral summers by 19 southern elephant seals tagged with fluorometers. Conventionally, fluorescence data collected during the day (quenched) were corrected using the limit of the mixed layer, assuming that phytoplankton are uniformly mixed from the surface to this depth. However, distinct deep fluorescence maxima were measured in approximately 30% of the night (unquenched) data. To account for the evidence that chlorophyll is not uniformly mixed in the upper layer, we propose correcting from the limit of the euphotic zone, defined as the depth at which photosynthetically available radiation is ~ 1% of the surface value. Mixed layer depth exceeded euphotic depth over 80% of the time. Under these conditions, quenching was corrected from the depth of the remotely derived euphotic zone Zeu, and compared with fluorescence corrected from the depth of the density-derived mixed layer. Deep fluorescence maxima were evident in only 10% of the day data when correcting from mixed layer depth. This was doubled to 21% when correcting from Zeu, more closely matching the unquenched (night) data. Furthermore, correcting from Zeu served to conserve non-uniform chlorophyll features found between the 1% light level and mixed layer depth. |
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109 |
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1812-0792 |
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6304 |
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Journal |
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Year |
2021 |
Publication |
Natural Hazards and Earth System Sciences Discussions |
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1-25 |
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133 |
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1561-8633 |
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8019 |
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Peer-reviewed symposium |
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Year |
2022 |
Publication |
10th iag international conference of geomorphology, 12-16 september 2022, coimbra (portugal) |
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While recent studies highlighted the great mobility of boulder beaches related to the impact of storm waves, numerous researches are still needed to better understand the morphodynamic of coastal boulder accumulations. This paper provides original data about pluri-annual morphological and sedimentological changes, as well as storm-induced geomorphic processes and their impact on the Valahnúkur boulder barrier, in the south-west of Iceland. First described by Etienne & Paris (2010), this massive accumulation of boulders shows numerous evidences of coastal barrier flooding and intense boulder mobility. Between May 2015 and May 2021, a topo-morphological survey was undertaken to analyze and quantify both cross-shore and longshore morphosedimentary processes of the Valahnúkur boulder barrier and surrounding areas. Annual campaigns of UAV (Unmanned Aerial Vehicle) flights were conducted in order to produce a set of Digital Elevation Models (DEMs) and Orthophotographs using Structure-from-Motion photogrammetry. DEMs were compared to deduce the morphological changes. Orthophotographs were analyzed from a deep learning-based method to estimate the changes in the spatial distribution of boulder sizes. Hydrodynamic conditions were reconstructed using wave buoy and tide gauge measurements. Wave runup were calibrated from the analysis of a wave/swash motion data set acquired by video monitoring related to different hydrodynamic conditions. The chronology of extreme water levels has been reconstructed on this high refective beach to estimate the elevation of the wave action during the survey period. From the sediment budget calculation, a significant northward longshore drift of around 1000 m3/a is highlighted on the beachface. The ridge and back-barrier areas were dominated by accretion related to cross-shore boulder transport from the beach. The volume of transported boulders is highly variable according to hydrodynamic conditions. Although the morphogenic impact of winter storms is difficult to assess, the observed morphological changes suggest processes dominated by swash, overtopping and overwash. The boulder size analysis highlights a link between the boulders mass and their movement landward. Video monitoring indicates that the amplitude of the swash is quite similar whether the hydrodynamic conditions are normal or energetic. The high porosity of the barrier appears to be a key factor in the dissipation of wave energy. |
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1216 |
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ICG2022-359 |
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8409 |
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Locatelli R, Bousquet P, Hourdin F, Saunois M, Cozic A, Couvreux F, Grandpeix J-Y, Lefebvre M-P, Rio C, Bergamaschi P, Chambers S D, Karstens U, Kazan V, van der Laan S, Meijer H A J, Moncrieff J, Ramonet M, Scheeren H A, Schlosser C, Schmidt M, Vermeulen A, Williams A G, |
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Title |
Atmospheric transport and chemistry of trace gases in LMDz5B: evaluation and implications for inverse modelling
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Journal Article |
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Year |
2015 |
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Geosci. Model Dev. |
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8 |
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2 |
Pages |
129-150 |
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416 |
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Copernicus Publications |
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1991-9603 |
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5345 |
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O'Connor, F.M., C.E. Johnson, O. Morgenstern, N.L. Abraham, P. Braesicke, M. Dalvi, G.A. Folberth, M.G. Sanderson, P.J. Telford, A. Voulgarakis, P.J. Young, G. Zeng, W.J. Collins, and J.A. Pyle |
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Title |
Evaluation of the new UKCA climate-composition model – Part 2: The Troposphere |
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Journal Article |
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2014 |
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Geosci. Model Dev. |
Abbreviated Journal |
GMD |
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7 |
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41-91 |
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416 |
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1991-962X |
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5346 |
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