Results 1 to 10 of about 68,537 (109)

Empirically Estimated Electron Lifetimes in the Earth's Radiation Belts: Van Allen Probe Observations

Geophysical Research Letters, 2020
We use measurements from NASA's Van Allen Probes to calculate the decay time constants for electrons over a wide range of energies (30 keV to 4 MeV) and L values ( L = 1.3–6.0) in the Earth's radiation belts.
S. G. Claudepierre, Q. Ma, J. Bortnik, T. P. O'Brien, J. F. Fennell, J. B. Blake   +5 more
doaj   +1 more source

Lipid Biomarkers Quantify Holocene Summer Temperature and Ice Cap Sensitivity in Icelandic Lakes

Geophysical Research Letters, 2020
Although recent research has made significant advances in characterizing Iceland's Holocene environmental history, the region still lacks reliable and continuous records of corresponding paleotemperature.
David J. Harning, Lorelei Curtin, Áslaug Geirsdóttir, William J. D'Andrea, Gifford H. Miller, Julio Sepúlveda   +5 more
doaj   +1 more source

Two Decades of Ocean Acidification in the Surface Waters of the Beaufort Gyre, Arctic Ocean: Effects of Sea Ice Melt and Retreat From 1997–2016

Geophysical Research Letters, 2020
Anthropogenic CO2 uptake drives ocean acidification and so decreases the calcium carbonate (CaCO3) saturation state (Ω). Undersaturation of surface water with respect to aragonite‐type CaCO3 was first reported for 2008 in the Canada Basin, preceding ...
Y. Zhang, M. Yamamoto‐Kawai, W.J. Williams   +2 more
doaj   +1 more source

Inter‐episodic Tremor and Slip Event Episodes of Quasi‐spatiotemporally Discrete Tremor and Very Low Frequency Earthquakes in Cascadia Suggestive of a Connective Underlying, Heterogeneous Process

Geophysical Research Letters, 2020
Exploring relationships between different types of slow earthquakes is essential for determining their source properties and controlling parameters. Studies show that very low frequency earthquakes (VLFEs) and tremor are discrete events that necessitate ...
Alexandra A. Hutchison
doaj   +1 more source

A Long‐Term View of Episodic Tremor and Slip in Cascadia

Geophysical Research Letters, 2020
Episodic Tremor and Slip, or ETS, is a well‐recognized phenomenon in the Cascadia subduction zone. Constraining the precise location of geodetically measured slip during ETS is important for clarifying the relationship between slip and tremor during ETS,
Noel M. Bartlow
doaj   +1 more source

Nonlinear Impacts of Surface Exchange Coefficient Uncertainty on Tropical Cyclone Intensity and Air‐Sea Interactions

Geophysical Research Letters, 2020
Tropical cyclone maximum intensity is believed to result from a balance between the surface friction, which removes energy, and a temperature/moisture (enthalpy) difference between the sea surface and the air above it, which adds energy.
Robert G. Nystrom, Xingchao Chen, Fuqing Zhang, Christopher A. Davis   +3 more
doaj   +1 more source

Arctic‐Atlantic Cyclones: Variability in Thermodynamic Characteristics, Large‐Scale Flow, and Local Impacts

Geophysical Research Letters
Cyclones at polar latitudes of the Atlantic‐Arctic corridor exhibit different thermodynamic characteristics. Midlatitude‐origin cyclones, which make up about 14% of wintertime cyclones in the region, are generally warm and moist. The more numerous Arctic‐
Dandan Tao, Camille Li, Richard Davy, Shengping He, Thomas Spengler, Clio Michel, Andrea Rosendahl   +6 more
doaj   +1 more source

Experimentally Derived Thresholds for Windblown Sand on Mars

Geophysical Research Letters, 2020
Aeolian sand transport frequently occurs on Mars despite wind speeds rarely exceeding predicted thresholds for motion. This dissonance is problematic for understanding aeolian processes and the resulting geomorphologic responses in contemporary and ...
C. Swann, D. J. Sherman, R. C. Ewing
doaj   +1 more source

Hysteresis of the Antarctic Ice Sheet With a Coupled Climate‐Ice‐Sheet Model

Geophysical Research Letters
The stability of the Antarctic ice sheet under different fixed CO2 levels and orbital configurations is explored using a coupled climate‐ice sheet model, starting from either a pre‐industrial ice sheet or an ice‐free, isostatically rebounded geometry ...
G. Leloup, A. Quiquet, D. M. Roche, C. Dumas, D. Paillard   +4 more
doaj   +1 more source

Empirically Estimated Electron Lifetimes in the Earth's Radiation Belts: Comparison With Theory

Geophysical Research Letters, 2020
We compute quasilinear diffusion rates due to pitch angle scattering by various mechanisms in the Earth's electron radiation belts. The calculated theoretical lifetimes are compared with observed decay rates, and we find excellent qualitative agreement ...
S. G. Claudepierre, Q. Ma, J. Bortnik, T. P. O'Brien, J. F. Fennell, J. B. Blake   +5 more
doaj   +1 more source