Browsing by Issue Date
Now showing items 21-40 of 5175
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Secondary Minerals Drive Extreme Lithium Isotope Fractionation During Tropical Weathering
; ; ; ; (Journal of Geophysical Research: Earth Surface, 2022-02-15)
Lithium isotopes are used to trace weathering intensity, but little is known about the processes that fractionate them in highly weathered settings, where secondary minerals play a dominant role in weathering reactions. ... -
Investigation of subsurface connectivity and subsurface stormflow in low mountain ranges—Findings from the two research catchments Obere Brachtpe and Bohlmicke (Germany)
(Hydrological Processes, 2022-02-12)The two small research catchments Obere Brachtpe (2.6 km2; 50.989986, 7.752013) and Bohlmicke (1 km2, 51.079319, 7.892988) are located in the Rhenish Massif, a low mountain range in Germany. Land use in both catchments is ... -
Effects of CO2 and Ocean Mixing on Miocene and Pliocene Temperature Gradients
; ; ; (Paleoceanography and Paleoclimatology, 2022-02-11)
Cenozoic climate changes have been linked to tectonic activity and variations in atmospheric CO2 concentrations. Here, we present Miocene and Pliocene sensitivity experiments performed with the climate model COSMOS. The ... -
The Arctic Ocean in CMIP6 Models: Biases and Projected Changes in Temperature and Salinity
; ; ; ; ; ; (Earth's Future, 2022-02-11)
We examine the historical evolution and projected changes in the hydrography of the deep basin of the Arctic Ocean in 23 climate models participating in the Coupled Model Intercomparison Project Phase 6 (CMIP6). The ... -
Vertically Divergent Responses of SOC Decomposition to Soil Moisture in a Changing Climate
; ; ; ; ; ; (Journal of Geophysical Research: Biogeosciences, 2022-01-31)
The role of soil moisture for organic matter decomposition rates remains poorly understood and underrepresented in Earth System Models (ESMs). We apply the Dual Arrhenius Michaelis‐Menten (DAMM) model to a selection of ESM ... -
Attribution of Observed Recent Decrease in Low Clouds Over the Northeastern Pacific to Cloud‐Controlling Factors
; ; ; (Geophysical Research Letters, 2022-01-28)
Marine low clouds cool the Earth's climate, with their coverage (LCC) being controlled by their environment. Here, an observed significant decrease of LCC in the northeastern Pacific over the past two decades is linked ... -
Impact of Spreading Rate and Age‐Offset on Oceanic Transform Fault Morphology
; ; (Geophysical Research Letters, 2022-01-24)
Oceanic transform faults (OTFs) are an inherent part of seafloor spreading and plate tectonics, whereas the process controlling their morphology remains enigmatic. Here, we systematically quantify variations in transform ... -
Multi‐Band Raman Analysis of Radiation Damage in Zircon for Thermochronology: Partial Annealing and Mixed Signals
; ; (Geochemistry, Geophysics, Geosystems, 2022-01-24)
Four zircon Raman bands were previously calibrated to give consistent estimates of the accumulated self‐irradiation α‐dose in unannealed volcanic samples. Partial annealing of radiation damage produces inconsistent values ... -
New insights into particle transport in karst conduits using comparative tracer tests with natural sediments and solutes during low‐flow and high‐flow conditions
; ; (Hydrological Processes, 2022-01-23)
Colloidal particles are an important vector for the transport of contaminants in karst aquifers, characterized by a high degree of hydrologic variability. Understanding this heterogeneity and hydrogeological functioning ... -
An Adaptive Hybrid Vertical Equilibrium/Full‐Dimensional Model for Compositional Multiphase Flow
(Water Resources Research, 2022-01-21)Efficient compositional models are required to simulate underground gas storage in porous formations where, for example, gas quality (such as purity) and loss of gas due to dissolution are of interest. We first extend the ... -
Seasonal Differences in the Attenuation of Polar Trace Organics in the Hyporheic Zone of an Urban Stream
; ; ; ; (Water Resources Research, 2022-01-20)
Attenuation of trace organic compounds (TrOCs) in a river occurs to a large extent in its hyporheic zone. A major part of the attenuation of polar TrOCs is of microbial origin. As microbial activity depends on temperature ... -
Investigating the Basal Shear Zone of the Submarine Tuaheni Landslide Complex, New Zealand: A Core‐Log‐Seismic Integration Study
; ; ; ; ; ; ; ; ; ; ; ; ; ; (Journal of Geophysical Research: Solid Earth, 2022-01-18)
Although submarine landslides have been studied for decades, a persistent challenge is the integration of diverse geoscientific datasets to characterize failure processes. We present a core‐log‐seismic integration study ... -
Uncertainty in Aerosol Optical Depth From Modern Aerosol‐Climate Models, Reanalyses, and Satellite Products
; ; ; ; ; ; (Journal of Geophysical Research: Atmospheres, 2022-01-18)
Despite the implication of aerosols for the radiation budget, there are persistent differences in data for the aerosol optical depth (τ) for 1998–2019. This study presents a comprehensive evaluation of the large‐scale ... -
Iron Exports From Catchments Are Constrained by Redox Status and Topography
; ; ; ; ; ; (Global Biogeochemical Cycles, 2022-01-18)
Fe(III) hydroxides stabilize organic carbon (OC) and P in soils. Observations of rising stream Fe concentrations are controversially posited to result from a flushing of iron‐rich deeper soil layers or a decrease of competing ... -
Assessing Volcanic Controls on Miocene Climate Change
; ; ; (Geophysical Research Letters, 2022-01-18)
The Miocene period saw substantially warmer Earth surface temperatures than today, particularly during a period of global warming called the Mid Miocene Climatic Optimum (MMCO; ∼17–15 Ma). However, the long‐term drivers ... -
The Goldilocks Zone in Cooling Demand: What Can We Do Better?
; ; (Earth's Future, 2022-01-18)
The higher frequency and intensity of sustained heat events have increased the demand for cooling energy across the globe. Current estimates of summer‐time energy demand are primarily based on Cooling Degree Days (CDD), ... -
Blaubeuren, Cloppenburg, and Machtenstein—Three recently recognized H‐group chondrite finds in Germany with distinct terrestrial ages and weathering effects
; ; ; ; ; ; ; (Meteoritics & Planetary Science, 2022-01-17)
In the last 7 years, three meteorites (Blaubeuren, Cloppenburg, and Machtenstein) found in Germany were identified as chondrites. Two of these rocks had been recovered from the impact sites decades ago but were not considered ... -
Faulting and Magmatic Accretion Across the Overlapping Spreading Center Between Vance Segment and Axial South Rift, Juan de Fuca Ridge
; ; (Geochemistry, Geophysics, Geosystems, 2022-01-12)
Plate divergence along mid‐ocean ridges is accommodated through faulting and magmatic accretion, and, at overlapping spreading centers (OSC), is distributed across two curvilinear overlapping ridge axes. One‐meter resolution ... -
Growth of microaerophilic Fe(II)‐oxidizing bacteria using Fe(II) produced by Fe(III) photoreduction
; ; ; ; ; (Geobiology, 2022-01-11)
Iron(II) (Fe(II)) can be formed by abiotic Fe(III) photoreduction, particularly when Fe(III) is organically complexed. Light‐influenced environments often overlap or even coincide with oxic or microoxic geochemical conditions, ... -
Rock Glacier Characteristics Under Semiarid Climate Conditions in the Western Nyainqêntanglha Range, Tibetan Plateau
; ; ; ; ; ; ; ; (Journal of Geophysical Research: Earth Surface, 2022-01-07)
Rock glaciers are receiving increased attention as a potential source of water and indicator of climate change in periglacial landscapes. They consist of an ice‐debris mixture, which creeps downslope. Although rock glaciers ...