Article
Engineering, Marine
Seong-Yeob Jeong, Kyungsik Choi, Hyun-Soo Kim
Summary: This study aims to investigate ship resistance characteristics in pack ice fields by considering variables such as channel width, broken ice floe size, ice concentration, and ice thickness, and to establish an equation for pack ice resistance prediction through non-dimensional regression analysis. The reliability of the equation is verified by comparing predicted results with full-scale ice trials conducted using the icebreaker Araon.
Article
Engineering, Environmental
Megan O'Sadnick, Chris Petrich, Camilla Brekke, Jofrid Skarohamar, Oystein Kleven
Summary: This study monitored seven fjords in Norway over three winter seasons and found significant variations in ice conditions between fjords and years. Factors such as weather, runoff, and snow cover were identified as potential drivers of ice formation.
COLD REGIONS SCIENCE AND TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Christian Pilz, Michael Lonardi, Ulrike Egerer, Holger Siebert, Andre Ehrlich, Andrew J. Heymsfield, Carl G. Schmitt, Matthew D. Shupe, Birgit Wehner, Manfred Wendisch
Summary: The BELUGA instrument was deployed during the MOSAiC expedition to study the cloudy Arctic atmospheric boundary layer above the sea ice. It collected 66 profile observations, including atmospheric parameters, radiation measurements, aerosol properties, and cloud particle images.
Article
Oceanography
Marion Lebrun, Martin Vancoppenolle, Gurvan Madec, Marcel Babin, Guislain Becu, Antonio Lourenco, Daiki Nomura, Frederic Vivier, Bruno Delille
Summary: By analyzing observational records from the Northern Hemisphere sea ice zone over the past decade, it was found that snow depth, melt pond presence, and ice thickness can explain the observed variance in under-ice light intensity. Most parameterizations can reproduce variations in under-ice light intensity, but large errors remain for individual records.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Environmental Sciences
Bento C. Goncalves, Michael Wethington, Heather J. Lynch
Summary: Pack-ice seals in the Southern Ocean are important indicator species and can be monitored using high-resolution satellite imagery. In this study, a fully automated seal detection method called SealNet 2.0 was developed, which achieved better results compared to human observers by using convolutional neural network models.
Article
Engineering, Aerospace
Ahmed Wageeh, Mohamed Doma, Ahmed Sedeek, Alaa Elghazouly
Summary: Global Navigation Satellite Systems (GNSS) play a crucial role in surveying, geodesy, and everyday life. This study investigates the impact of combining GPS and GLONASS observations on the estimation of Differential Code Bias (DCB) of satellites and receivers. Results indicate that the combination of GPS and GLONASS data leads to more accurate DCB estimation compared to using GPS data alone. The study also examines the effects of geomagnetic storms and seasonal changes on DCB variance.
ADVANCES IN SPACE RESEARCH
(2023)
Article
Environmental Sciences
Madison M. Smith, Luisa von Albedyll, Ian A. Raphael, Benjamin A. Lange, Ilkka Matero, Evgenii Salganik, Melinda A. Webster, Mats A. Granskog, Allison Fong, Ruibo Lei, Bonnie Light
Summary: The study reveals the prevalence of under-ice meltwater layers and false bottoms during the Arctic melt season and their implications for the ice-ocean system. These features play a significant role in ice growth, reduction of fluxes between ice and ocean, isolation of sea ice primary producers, and alteration of light transmission.
ELEMENTA-SCIENCE OF THE ANTHROPOCENE
(2022)
Article
Environmental Sciences
Harry D. Kambezidis, Basil E. Psiloglou, Ariadne Gavriil, Kalliopi Petrinoli
Summary: This study analyzed records from a ceilometer at the National Observatory of Athens over a 2-year period to provide statistics on the planetary-boundary layer (PBL) height and found seasonal variations in the PBL height, as well as different patterns of change between the upper and lower PBL heights.
Proceedings Paper
Engineering, Marine
Jess Horowitz, Victoria Preston, Anna P. M. Michel
Summary: Estimates of greenhouse gas emissions from Arctic estuarine environments mainly rely on in situ dissolved gas measurements during ice-free summer. However, recent studies have shown that dissolved methane and carbon dioxide in coastal Arctic environments exhibit strong seasonal variability, with at least one significant gas ventilation event occurring during the spring freshet. Determining whether the Arctic acts as a source or sink of greenhouse gas emissions has significant implications for climate change modeling.
2022 OCEANS HAMPTON ROADS
(2022)
Article
Statistics & Probability
El Mehdi Haress, Yaozhong Hu
Summary: The study proposes a statistical estimator to estimate all parameters theta, H, and sigma in the Ornstein-Uhlenbeck model simultaneously. The strong consistency and convergence rate of the estimator are proven, with the step size h being able to be arbitrarily fixed. The tools used include the generalized moment approach and the Malliavin calculus.
STATISTICAL INFERENCE FOR STOCHASTIC PROCESSES
(2021)
Article
Geosciences, Multidisciplinary
S. R. Bogdanov, R. E. Zdorovennov, N. Palshin, G. E. Zdorovennova, S. Yu Volkov, T. Efremova, G. G. Gavrilenko, A. Yu Terzhevik
Summary: This study quantitatively evaluates the hydrodynamic parameters of the convectively mixed layer in ice-covered boreal lakes, focusing on the spatial structure of CML and calculating all six elements of the turbulent stress matrix. The results show a high degree of anisotropy and periodicity in the pulsations, as well as a systematic drift in the horizontal plane. The presence of quasi-deterministic convective cells was also detected, along with zones of up- or downwelling in vertical planes.
RUSSIAN JOURNAL OF EARTH SCIENCES
(2021)
Article
Limnology
Samuel R. Laney, Richard A. Krishfield, John. M. Toole
LIMNOLOGY AND OCEANOGRAPHY
(2017)
Article
Oceanography
Craig M. Lee, Jim Thomson
Article
Oceanography
An T. Nguyen, Victor Ocana, Vikram Garg, Patrick Heimbach, John M. Toole, Richard A. Krishfield, Craig M. Lee, Luc Rainville
Article
Oceanography
N. C. Shibley, M. -L. Timmermans, J. R. Carpenter, J. M. Toole
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2017)
Article
Oceanography
Jeomshik Hwang, Steven J. Manganini, JongJin Park, Daniel B. Montlucon, John M. Toole, Timothy I. Eglinton
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2017)
Article
Oceanography
Isabela Astiz Le Bras, Igor Yashayaev, John M. Toole
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2017)
Article
Geosciences, Multidisciplinary
Richard J. Greatbatch, Martin Claus, Peter Brandt, Jan-Dirk Matthiessen, Franz Philip Tuchen, Francois Ascani, Marcus Dengler, John Toole, Christina Roth, J. Thomas Farrar
GEOPHYSICAL RESEARCH LETTERS
(2018)
Article
Oceanography
Isabela Astiz Le Bras, Steven R. Jayne, John M. Toole
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2018)
Article
Oceanography
Sylvia T. Cole, John M. Toole, Luc Rainville, Craig M. Lee
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2018)
Editorial Material
Oceanography
Peter Brewer, Don Chambers, Robert Hetland, Kristopher Karnauskas, Ryan Lowe, S. Bradley Moran, Lie-Yauw Oey, Nadia Pinardi, Andrey Proshutinsky
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2018)
Article
Multidisciplinary Sciences
Mary-Louise Timmermans, John Toole, Richard Krishfield
Article
Oceanography
D. S. Dukhovskoy, I. Yashayaev, A. Proshutinsky, J. L. Bamber, I. L. Bashmachnikov, E. P. Chassignet, C. M. Lee, A. J. Tedstone
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2019)
Article
Oceanography
Michael D. DeGrandpre, Chun-Ze Lai, Mary-Louise Timmermans, Richard A. Krishfield, Andrey Proshutinsky, Daniel Torres
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2019)
Article
Oceanography
S. J. Kelly, A. Proshutinsky, E. K. Popova, Y. K. Aksenov, A. Yool
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2019)
Editorial Material
Oceanography
A. Proshutinsky, R. Krishfield, M. -L. Timmermans
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2020)