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Now showing items 21-40 of 4725
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The Importance of the Representation of DMS Oxidation in Global Chemistry‐Climate Simulations
; ; ; ; (Geophysical Research Letters, 2021-07-08)
The oxidation of dimethyl sulfide (DMS) is key for the natural sulfate aerosol formation and its climate impact. Multiphase chemistry is an important oxidation pathway but neglected in current chemistry‐climate models. ... -
Quasi‐4‐Day Wave: Atmospheric Manifestation of the First Symmetric Rossby Normal Mode of Zonal Wavenumber 2
; ; (Journal of Geophysical Research: Atmospheres, 2021-07-07)
This paper describes global characteristics of the westward‐propagating planetary wave with a period of ∼4 days and zonal wavenumber 2, here referred to as quasi‐4‐day wave (Q4DW), which is considered to be a manifestation ... -
Preliminary Statistical Comparisons of Spin‐Averaged Electron Data From Arase and Van Allen Probes Instruments
Szabó‐Roberts, Mátyás;; ; Vasile, Ruggero; ; ; ; ; ; ; ; ; Takashima, Takeshi; Higashio, Nana; Hori, Tomo; ; ; (Journal of Geophysical Research: Space Physics, 2021-07-06)
Following the end of the Van Allen Probes mission, the Arase satellite offers a unique opportunity to continue in‐situ radiation belt and ring current particle measurements into the next solar cycle. In this study we compare ... -
Assessment of C, N, and Si Isotopes as Tracers of Past Ocean Nutrient and Carbon Cycling
; ; ; Fietz, S.; ; ; ; ; Ren, H.; ; ; GEOTRACES PAGES Biological Productivity Working Group Members (Global Biogeochemical Cycles, 2021-07-02)
Biological productivity in the ocean directly influences the partitioning of carbon between the atmosphere and ocean interior. Through this carbon cycle feedback, changing ocean productivity has long been hypothesized as ... -
A ∼12 Myr Miocene Record of East Asian Monsoon Variability From the South China Sea
; ; ; (Paleoceanography and Paleoclimatology, 2021-07-01)
The long‐term evolution of the East Asian Monsoon and the processes controlling its variability under changing climate boundary conditions remain enigmatic. Here, we integrate new and published high‐resolution planktic and ... -
The Evolution of Central Volcanoes in Ultraslow Rift Systems: Constraints From D. João de Castro Seamount, Azores
; ; ; ; (Tectonics, 2021-06-29)
The Dom João de Castro seamount in the Hirondelle Basin (Azores) is a central volcano on the ultraslow diverging Terceira Rift axis. The combination of structural and geochemical data provides insights into the evolution ... -
Deep Emulators for Differentiation, Forecasting, and Parametrization in Earth Science Simulators
; (Journal of Advances in Modeling Earth Systems, 2021-06-28)
To understand and predict large, complex, and chaotic systems, Earth scientists build simulators from physical laws. Simulators generalize better to new scenarios, require fewer tunable parameters, and are more interpretable ... -
Seasonal and Mesoscale Variability of the Two Atlantic Water Recirculation Pathways in Fram Strait
; von Appen, Wilken‐Jon; (Journal of Geophysical Research: Oceans, 2021-06-25)
Atlantic Water (AW), which is transported northward by the West Spitsbergen Current (WSC), partly recirculates (i.e., turns westward) in Fram Strait. This determines how much heat and salt reaches the Arctic Ocean, and how ... -
Results of the Electron Drift Instrument on Cluster
; Quinn, J. M.; ; McIlwain, C. E.; Vaith, H.; ; ; ; ; (Journal of Geophysical Research: Space Physics, 2021-06-23)
The electron drift instrument (EDI) on Cluster pioneered a new method of measuring electric fields, using a beam of electrons to sample the drift velocity over a km‐scale gyro orbit. The technique is especially well suited ... -
Hydrological modelling for assessing spatio‐temporal groundwater recharge variations in the water‐stressed Amathole Water Supply System, Eastern Cape, South Africa
; Eley, Malte; Schöniger, Matthias; Gwapedza, David; Tanner, Jane; Mantel, Sukhmani Kaur; Scheihing, Konstantin (Hydrological Processes, 2021-06-23)
Abstract To increase the resilience of regional water supply systems in South Africa in the face of anticipated climatic changes and a constant increase in water demand, water supply sources require diversification. Many ... -
Development of an Alternative Test System for Chronic Testing of Lotic Macroinvertebrate Species: A Case Study with the Insecticide Imidacloprid
(Environmental Toxicology and Chemistry, 2021-06-22)There are currently few suitable test systems for the chronic toxicity testing of aquatic macroinvertebrates under stream conditions. Therefore, a new test system mimicking running water conditions was developed for testing ... -
Migration of Arc Magmatism Above Mantle Wedge Diapirs With Variable Sediment Contribution in the Aegean
; ; ; Melfos, V.; Klemd, R. (Geochemistry, Geophysics, Geosystems, 2021-06-17)
Compiled data show the age progression of magmatic centers along the two approximately linear profiles from NE Greece and NW Turkey to the South Aegean Volcanic Arc. The age progression reveals the southwestward migration ... -
Seismic Velocity Variations in a 3D Martian Mantle: Implications for the InSight Measurements
Plesa, A.‐C.;; ; ; ; ; ; ; ; ; ; ; ; (Journal of Geophysical Research: Planets, 2021-06-17)
We use a large data set of 3D thermal evolution models to predict the distribution of present‐day seismic velocities in the Martian interior. Our models show a difference between maximum and minimum S wave velocity of up ... -
Simulation of Record Arctic Stratospheric Ozone Depletion in 2020
Grooß, Jens‐Uwe; (Journal of Geophysical Research: Atmospheres, 2021-06-17)
In the Arctic winter/spring of 2019/2020, stratospheric temperatures were exceptionally low until early April and the polar vortex was very stable. As a consequence, significant chemical ozone depletion occurred in the ... -
Topographic and Geologic Controls on Frost Cracking in Alpine Rockwalls
; (Journal of Geophysical Research: Earth Surface, 2021-06-14)
Frost weathering is a major control on rockwall erosion in Alpine environments. Previous frost cracking model approaches used air temperatures as a proxy for rock temperatures to drive frost weathering simulations on ... -
Polar Stratospheric Clouds: Satellite Observations, Processes, and Role in Ozone Depletion
; ; ; ; ; ; Grooß, Jens‐Uwe; ; ; ; ; ; ; ; ; ; (Reviews of Geophysics, 2021-06-10)
Polar stratospheric clouds (PSCs) play important roles in stratospheric ozone depletion during winter and spring at high latitudes (e.g., the Antarctic ozone hole). PSC particles provide sites for heterogeneous reactions ... -
Predicting Geothermal Heat Flow in Antarctica With a Machine Learning Approach
; (Journal of Geophysical Research: Solid Earth, 2021-06-10)
We present a machine learning approach to statistically derive geothermal heat flow (GHF) for Antarctica. The adopted approach estimates GHF from multiple geophysical and geological data sets, assuming that GHF is substantially ... -
Dissolved Organic Matter in the Upwelling System off Peru: Imprints of Bacterial Activity and Water Mass Characteristics
; (Journal of Geophysical Research: Biogeosciences, 2021-06-09)
Microbial degradation of dissolved organic matter (DOM) contributes to the formation and preservation of oxygen minimum zones (OMZs) in the ocean, but information on the spatial distribution and molecular composition of ... -
Restricted Oxygen‐Deficient Basins on the Northern European Epicontinental Shelf Across the Toarcian Carbon Isotope Excursion Interval
; ; ; Wille, Martin; (Paleoceanography and Paleoclimatology, 2021-06-09)
The worldwide recognition of the Toarcian carbon isotope excursion (T‐CIE) in organic‐rich sedimentary rocks has been linked to an oceanic anoxic event (OAE) which implies the world's deep oceans were anoxic ∼183 Ma. The ... -
On the present habitats and ecology of Vertigo pseudosubstriata Ložek, 1954 (Mollusca, Gastropoda, Vertiginidea) in Central Asia and its distribution history in Central and Eastern Europe
; Vasyliev, Pavlo; Khoptynets, Ivan; Tkach, Vitalii; (Journal of Quaternary Science, 2021-06-07)
The small terrestrial gastropod Vertigo pseudosubstriata Ložek, 1954 is one of the rarest glacial indicator species in the Pleistocene of Central and Eastern Europe. In all, this species has been found at only about 15 ...