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Obstacles to high-dimensional particle filtering
Particle filters are ensemble-based assimilation schemes that, unlike the ensemble Kalman filter, employ a fully nonlinear and non-Gaussian analysis step to compute the...- publication PDF
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Lagrangian particle tracking in three dimensions via single-camera in-line...
Lagrangian particle trajectories are measured in three spatial dimensions with a single camera using the method of digital in-line holography. Lagrangian trajectories of...- publication PDF
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Analysis of ozone and nitric acid in spring and summer Arctic pollution...
In this paper, we analyze tropospheric Oâ together with HNOâ during the POLARCAT (Polar Study using Aircraft, Remote Sensing, Surface Measurements and Models, of Climate,...- publication PDF
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Hybrid mass coordinate in WRF-ARW and its impact on upper-level turbulence...
Although a terrain-following vertical coordinate is well suited for the application of surface boundary conditions, it is well known that the influences of the terrain on the...- publication PDF
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Refinement of the use of inhomogeneous background error covariance estimated...
Background error covariance (BEC) is one of the key components in data assimilation systems for numerical weather prediction. Recently, a scheme of using an inhomogeneous and...- publication PDF
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Vertical air motion from t-rex radiosonde and dropsonde data
The primary goal of this study is to explore the potential for estimating the vertical velocity (VV) of air from the surface to the stratosphere, using widely available...- publication PDF
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Atmospheric forcing of Fram Strait sea ice export: A closer look
Fram Strait is the primary region of sea ice export from the Arctic and therefore plays an important role in regulating the amount of sea ice and freshwater within the Arctic....- publication PDF
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Predicting a decadal shift in North Atlantic climate variability using the...
Decadal prediction experiments were conducted as part of phase 5 of the Coupled Model Intercomparison Project (CMIP5) using the GFDL Climate Model, version 2.1 (CM2.1) forecast...- publication PDF
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Long-range prediction and the stratosphere
Over recent years there have been concomitant advances in the development of stratosphere-resolving numerical models, our understanding of stratosphere-troposphere interaction,...- publication PDF
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Introduction to Adjoint Techniques and the MM5 Adjoint Modeling System
Adjoint models are increasingly applied to many problems in meteorology and oceanography. The adjoint model of MM5 is a tool which effectively computes the gradient (or a...- publication PDF
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The relation between dayside local Poynting flux enhancement and cusp reconnection
The Defense Meteorological Satellite Program (DMSP) F15 satellite frequently observes an unusually high level of local Poynting flux when the interplanetary magnetic field (IMF)...- publication PDF
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Solar filament impact on 21 January 2005: Geospace consequences
On 21 January 2005, a moderate magnetic storm produced a number of anomalous features, some seen more typically during superstorms. The aim of this study is to establish the...- publication PDF
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Climatology characteristics of ionospheric irregularities described with GNSS ROTI
At equatorial and high latitudes, the intense ionospheric irregularities and plasma density gradients can seriously affect the performances of radio communication and satellite-...- publication PDF
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Impact of strong and weak stratospheric polar vortices on geomagnetic...
The impact of strong and weak stratospheric polar vortices on geomagnetic semidiurnal solar and lunar tides is investigated during Northern Hemisphere (NH) winters using ground-...- publication PDF
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Interhemispheric asymmetry in the highâlatitude neutral density variations...
During the second recovery phase of the 13–14 March 2022 storm, intense high‐latitude neutral mass density spikes are detected by satellites at ∼500 km in...- publication PDF
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On the wave number 2 eastward propagating quasi 2âday wave at middle and...
The temperature and wind data sets from the ensemble data assimilation version of the Whole Atmosphere Community Climate Modelâ+âData Assimilation Research Testbed...- publication PDF
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Uncertainty in global groundwater storage estimates in a Total Groundwater...
Groundwater is a finite resource under continuous external pressures. Current unsustainable groundwater use threatens the resilience of aquifer systems and their ability to...- publication PDF
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Climate feedbacks in CCSM3 under changing COâ forcing. Part II: Variation...
Are equilibrium climate sensitivity and the associated radiative feedbacks a constant property of the climate system, or do they change with forcing magnitude and base climate?...- publication PDF
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The ionospheric gravity and diamagnetic current systems
Large-scale currents in the ionosphere are driven by a variety of sources, including neutral winds, gravity, and plasma pressure gradients. While the stronger daytime wind-...- publication PDF
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SO2 emissions derived from TROPOMI observations over India using a...
The rapid development of the economy and the implementation of environmental policies adapted in India have led to fast changes of regional SO2 emissions. We present a monthly...- publication PDF
