Geophysical Research Letters
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A comparison between large‐scale irregularities and scintillations in the polar ionosphereAbstract A comparison tool has been developed by mapping the global GPS total electron content (TEC) and large coverage of ionospheric scintillations together on the geomagnetic latitude/magnetic local time coordinates. Using this tool, a comparison between large‐scale ionospheric irregularities and scintillations is pursued during a geomagnetic storm. Irregularitie... ... hiện toàn bộ
Geophysical Research Letters - Tập 43 Số 10 - Trang 4790-4798 - 2016
Lunar ferroan anorthosites and mare basalt sources: The mixed connectionGlobal overturn of a hot, gravitationally unstable lunar mantle immediately following the solidification of a magma ocean [and essentially complete by 4.4 Ga] explains several characteristics of lunar petrology. Lunar mare basalt sources are inferred to be depleted in europium and alumina. These depletions are consensually attributed to complementary plagioclase floating from a magma ocean... ... hiện toàn bộ
Geophysical Research Letters - Tập 18 Số 11 - Trang 2065-2068 - 1991
Greenland‐Wide Seasonal Temperatures During the Last DeglaciationAbstract The sensitivity of the Greenland ice sheet to climate forcing is of key importance in assessing its contribution to past and future sea level rise. Surface mass loss occurs during summer, and accounting for temperature seasonality is critical in simulating ice sheet evolution and in interpreting glacial landforms and chronologies. Ice core records constrain... ... hiện toàn bộ
Geophysical Research Letters - Tập 45 Số 4 - Trang 1905-1914 - 2018
Droughts, Pluvials, and Wet Season Timing Across the Chao Phraya River Basin: A 254‐Year Monthly Reconstruction From Tree Ring Widths and δ18OAbstract Water system operations require subannual streamflow data—e.g., monthly or weekly—that are not readily achievable with conventional streamflow reconstructions from annual tree rings. This mismatch is particularly relevant to highly seasonal rivers such as Thailand's Chao Phraya. Here, we combine tree ring width and stable oxygen isotope ratios (... hiện toàn bộ
Geophysical Research Letters - Tập 49 Số 17 - 2022
Increasing Drought Risks Over the Past Four Centuries Amidst Projected Flood Intensification in the Kabul River Basin (Afghanistan and Pakistan)—Evidence From Tree RingsAbstract Increased flood risks have been projected, but with large uncertainties, in the Kabul River Basin (Afghanistan and Pakistan). To place future changes in a long‐term perspective, we produce a 382‐year precipitation reconstruction for the basin using seven tree‐ring chronologies of old‐growth conifers from the Hindu Kush Mountains, a monsoon‐shadow area. The ... ... hiện toàn bộ
Geophysical Research Letters - Tập 49 Số 24 - 2022
MAS measurements of the latitudinal distribution of water vapor and ozone in the mesosphere and lower thermosphereWe present measurements of the latitudinal variation of nighttime O3 and H2 O in the mesosphere and (for O 3 ) lower thermosphere obtained with the Millimeter‐wave Atmospheric Sounder (MAS) instrument during the ATLAS 2 mission (8–15 April 1993). These are the first such measur... ... hiện toàn bộ
Geophysical Research Letters - Tập 23 Số 17 - Trang 2317-2320 - 1996
CCl2F2 mixing ratio profiles in the 1995 late winter Arctic vortex from balloon‐borne spectraThe vertical profile of CCl2 F2 has been retrieved in the altitude range 15 to 22 km from solar occultation spectra recorded with a balloon‐borne Fourier transform spectrometer (0.013 cm−1 resolution) launched on 22 March 1995 from Kiruna (Sweden, 67°N, 22°E). The choices of the grid of retrieval altitudes, of the spectral range... ... hiện toàn bộ
Geophysical Research Letters - Tập 24 Số 19 - Trang 2367-2370 - 1997
Observational constraints on the kinetics of the ClO‐BrO and ClO‐ClO ozone loss cycles in the Arctic winter stratosphereObservations of the balloon‐borne LPMA/DOAS remote sensing instruments performed in the Arctic stratosphere in February 1999 are used to constrain a photochemical model. Measurements of all relevant nitrogen, chlorine, and bromine species indicate that moderate heterogeneous chlorine activation occurred in a filament of the Arctic vortex. Model‐measurement comparisons for OClO serve as an ... ... hiện toàn bộ
Geophysical Research Letters - Tập 34 Số 5 - 2007
Single‐station monitoring of volcanoes using seismic ambient noiseAbstract Seismic ambient noise cross correlation is increasingly used to monitor volcanic activity. However, this method is usually limited to volcanoes equipped with large and dense networks of broadband stations. The single‐station approach may provide a powerful and reliable alternative to the classical “cross‐station” approach when measuring variation of seismic... ... hiện toàn bộ
Geophysical Research Letters - Tập 43 Số 16 - Trang 8511-8518 - 2016
Estimates of heat flow in the deep mantle based on the power requirements for the geodynamoRegeneration of the magnetic field by convection in the core places demands on heat flow into the base of the mantle. If the heat flow is too low, thermal convection is shut off and the rate of generation of compositional buoyancy by the solidification of the core becomes too low to sustain the geodynamo. Conversely, a large heat flow causes rapid growth of the inner core, so that convecti... ... hiện toàn bộ
Geophysical Research Letters - Tập 29 Số 12 - 2002
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