| Satellite tidal magnetic signals constrain oceanic lithosphere-asthenosphere boundary - :15731 | National Environmental Satellite and Data Information Service (NESDIS)
The tidal flow of electrically conductive oceans through the geomagnetic field results in the generation of secondary magnetic signals, which provide information on the subsurface structure. Data from the new generation of satellites were shown to contain magnetic signals due to tidal flow; however, there are no reports that these signals have been used to infer subsurface structure. We use satellite-detected tidal magnetic fields to image the global electrical structure of the oceanic lithosphere and upper mantle down to a depth of about 250 km. The model derived from more than 12 years of satellite data reveals a similar to 2-km-thick upper resistive layer followed by a sharp increase in electrical conductivity likely associated with the lithosphere-asthenosphere boundary, which separates colder rigid oceanic plates from the ductile and hotter asthenosphere.
Falchi, F.; Cinzano, P.; Duriscoe, D.; Kyba, C. C. M.; Elvidge, C. D.; Baugh, K.; Portnov, B. A.; Rybnikova, N. A.; Furgoni, R.;
Published:
2016
Source:
Science Advances, 2(6), e1600377.
Series:
CIRES (Cooperative Institute for Research in Environmental Sciences)
Description:
Artificial lights raise night sky luminance, creating the most visible effect of light pollution-artificial skyglow. Despite the increasing interest among scientists in fields such as ecology, astronomy, health care, and land-use planning, light poll...
CIRES (Cooperative Institute for Research in Environmental Sciences)
Description:
The National Oceanographic and Atmospheric Administration (NOAA) uses water column sonar data to assess physical and biological characteristics from the ocean surface to the seabed. Acoustic surveys produce large volumes of data that can deliver valu...
Negrea, C.; Zabotin, N.; Bullett, T.; Fuller-Rowell, T.; Fang, T. W.; Codrescu, M.;
Published:
2016
Source:
Journal of Geophysical Research-Space Physics, 121(4), 3665-3680.
Series:
CIRES (Cooperative Institute for Research in Environmental Sciences)
Description:
Traveling ionospheric disturbances (TIDs) are ubiquitous in the thermosphere-ionosphere and are often assumed to be caused by acoustic gravity waves (AGWs). This study performs an analysis of the TID and AGW activity above Wallops Island, VA, during ...
CIRES (Cooperative Institute for Research in Environmental Sciences)
Description:
Data-based modeling of the magnetic field originating in the Earth's ionosphere is challenging due to the multiple timescales involved and the small spatial scales of some of the current systems, especially the equatorial electrojet (EEJ) that flows ...
CIRES (Cooperative Institute for Research in Environmental Sciences)
Description:
Digital elevation models (DEMs) are used to model numerous coastal processes, including tsunamis, contaminant dispersal, and erosion. In the bathymetric realm, the distance between measurements typically increases farther from shore (i.e., deeper wat...
CIRES (Cooperative Institute for Research in Environmental Sciences)
Description:
The Alpha-Mendeleev ridge complex is a first-order physiographic and geological feature of the Arctic Amerasia Basin. High amplitude "chaotic" magnetic anomalies (the High Arctic Magnetic High Domain or HAMH) are associated with the complex and exten...
Schnepf, N. R.; Manoj, C.; An, C.; Sugioka, H.; Toh, H.;
Published:
2016
Source:
Pure and Applied Geophysics, 173(12), 3935-3953.
Series:
CIRES (Cooperative Institute for Research in Environmental Sciences)
Description:
The recent deployment of highly sensitive seafloor magnetometers coinciding with the deep solar minimum has provided excellent opportunities for observing tsunami electromagnetic signals. These fluctuating signals (periods ranging from 10-20 min) are...
Balikhin, M. A.; Rodriguez, J. V.; Boynton, R. J.; Walker, S. N.; Aryan, H.; Sibeck, D. G.; Billings, S. A.;
Published:
2016
Source:
Space Weather-the International Journal of Research and Applications, 14(1), 22-31.
Series:
CIRES (Cooperative Institute for Research in Environmental Sciences)
Description:
Reliable forecasts of relativistic electrons at geostationary orbit (GEO) are important for the mitigation of their hazardous effects on spacecraft at GEO. For a number of years the Space Weather Prediction Center at NOAA has provided advanced online...
Loomis, S. E.; Russell, J. M.; Verschuren, D.; Morrill, C.; De Cort, G.; Damste, J. S. S.; Olago, D.; Eggermont, H.; Street-Perrott, F. A.; Kelly, M. A.;
Published:
2017
Source:
Science Advances, 3(1), e1600815.
Series:
CIRES (Cooperative Institute for Research in Environmental Sciences)
Description:
The gradient of air temperature with elevation (the temperature lapse rate) in the tropics is predicted to become less steep during the coming century as surface temperature rises, enhancing the threat of warming in high-mountain environments. Howeve...
Diaz, H. F.; Wahl, E. R.; Zorita, E.; Giambelluca, T. W.; Eischeid, J. K.;
Published:
2016
Source:
Journal of Climate, 29(15), 5661-5674.
Series:
CIRES (Cooperative Institute for Research in Environmental Sciences)
Description:
Few if any high-resolution (annually resolved) paleoclimate records are available for the Hawaiian Islands prior to; similar to 1850 CE, after which some instrumental records start to become available. This paper shows how atmospheric teleconnection ...
Schnepf, N. R.; Nair, M.; Maute, A.; Pedatella, N. M.; Kuvshinov, A.; Richmond, A. D.;
Published:
2018
Source:
Geophysical Research Letters, 45(15), 7257-7267.
Description:
Observed tidal geomagnetic field variations are due to a combination of electric currents in the ionosphere, ocean, and their induced counterparts. Using these variations to constrain subsurface electrical conductivity in oceanic regions is a promisi...
Lesson 13 introduces students to geological oceanography by presenting the basic structure of the Earth and the properties of Earth’s primary layers. Students learn the structure and composition of oceanic and continental crust and the theory of pl...
Scheinert, M.; Ferraccioli, F.; Schwabe, J.; Bell, R.; Studinger, M.; Damaske, D.; Jokat, W.; Aleshkova, N.; Jordan, T.; Leitchenkov, G.; Blankenship, D. D.; Damiani, T. M.; Young, D.; Cochran, J. R.; Richter, T. D.;
Published:
2016
Source:
Geophysical Research Letters, 43(2), 600-610.
Description:
Gravity surveying is challenging in Antarctica because of its hostile environment and inaccessibility. Nevertheless, many ground-based, airborne, and shipborne gravity campaigns have been completed by the geophysical and geodetic communities since th...
CIRES (Cooperative Institute for Research in Environmental Sciences)
Description:
The Alpha-Mendeleev ridge complex is a first-order physiographic and geological feature of the Arctic Amerasia Basin. High amplitude "chaotic" magnetic anomalies (the High Arctic Magnetic High Domain or HAMH) are associated with the complex and exten...