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COVID‐19 crisis reduces free tropospheric ozone across the Northern Hemisphere
Throughout spring and summer 2020, ozone stations in the northern extratropics recorded unusually low ozone in the free troposphere. From April to August, and from 1 to 8...- publication PDF
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The effect of subauroral polarization streams on the mid-latitude thermospher...
The temporal and spatial variations in thermospheric neutral winds at an altitude of 400 km in response to subauroral polarization streams (SAPS) are investigated using global...- publication PDF
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Spatially and temporally varying adaptive covariance inflation for ensemble f...
Ensemble filters are used in many data assimilation applications in geophysics. Basic implementations of ensemble filters are trivial but are susceptible to errors from many...- publication PDF
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The 2015 and 2016 wintertime air pollution in China: SO2 emission changes der...
Ambient pollutants and emissions in China have changed significantly in recent years due to strict control strategies implemented by the government. It is of great interest to...- publication PDF
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Dynamo currents, winds, and electric fields
After a brief presentation of Sq and L electric current systems deduced from geomagnetic data, electric conductivities and wind models in the dynamo region are discussed. It is...- publication PDF
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An observationally constrained 3D potential-field source-surface model for th...
The improvement of techniques for realistically modeling the solar magnetic field has been a priority in solar physics for decades. The challenge of creating synoptic maps of...- publication PDF
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On the ability of space‐based passive and active remote sensing observations ...
Space-borne observations of CO2 are vital to gaining understanding of the carbon cycle in regions of the world that are difficult to measure directly, such as the tropical...- publication PDF
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Modeling coronal response in decaying active regions with magnetic flux trans...
We present new measurements of the dependence of the extreme ultraviolet (EUV) radiance on the total magnetic flux in active regions as obtained from the Atmospheric Imaging...- publication PDF
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Evidence of liquid dependent ice nucleation in high-latitude stratiform cloud...
Ground-based lidar, radar and microwave radiometer observations at Eureka, Canada, Barrow, Alaska and over the western Arctic Ocean measure physical characteristics and...- publication PDF
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Exploration of the influence of environmental conditions on secondary organic...
Atmospheric chambers have been widely used to study secondary organic aerosol (SOA) properties and formation from various precursors under different controlled environmental...- publication PDF
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The Giant Nucleus Impactor (GNI): A system for the impaction and automated op...
Size distributions of giant aerosol particles (dry radius larger than 0.5 mu m, sometimes referred to as coarse-mode aerosol particles) are not well characterized in the...- publication PDF
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Formation and topology of foreshock bubbles
We use global and local hybrid (kinetic ions and fluid electrons) simulations to investigate the conditions under which foreshock bubbles (FBs) form and how their topology...- publication PDF
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Spatial decomposition of climate feedbacks in the Community Earth System Model
An ensemble of simulations from different versions of the Community Atmosphere Model in the Community Earth System Model (CESM) is used to investigate the processes responsible...- publication PDF
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Data citations within NCAR/UCP
Federal agencies, professional societies, and research organizations in the geo-sciences are moving towards requiring researchers to formally cite data that led to a given...- publication PDF
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Utilizing the Drake Passage Time-series to understand variability and change ...
The Southern Ocean is highly under-sampled for the purpose of assessing total carbon uptake and its variability. Since this region dominates the mean global ocean sink for...- publication PDF
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Advancements, measurement uncertainties, and recent comparisons of the NOAA f...
The NOAA frost point hygrometer (FPH) is a balloon-borne instrument flown monthly at three sites to measure water vapor profiles up to 28 km. The FPH record from Boulder,...- publication PDF
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Reconciling carbon-cycle concepts, terminology, and methodology
Recent projections of climatic change have focused a great deal of scientific and public attention on patterns of carbon (C) cycling as well as its controls, particularly the...- publication PDF
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Dual-wavelength radar technique development for snow rate estimation: A case ...
quantitative precipitation estimation (QPE) of snowfall has generally been expressed in power-law form between equivalent radar reflectivity factor (Z(e)) and liquid equivalent...- publication PDF
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Increasing women’s engagement in vector control: A report from Accelerate To...
Workshops with academic, national and local government, and community stakeholders were held in Kenya (2017) and Indonesia (2018) to understand the role and perceptions of women...- publication PDF
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Modern precipitation δ18O and trajectory analysis over the Himalaya-Tibet Oro...
Variations in oxygen isotope ratios (O-18) measured from modern precipitation and geologic archives provide a promising tool for understanding modern and past climate dynamics...- publication PDF
