0000000000208279

AUTHOR

Rigel Kivi

showing 3 related works from this author

Can turbulence within the field of view cause significant biases in radiative transfer modeling at the 183 GHz band?

2018

The hypothesis whether turbulence within the passive microwave sounders field of view can cause significant biases in radiative transfer modeling at the 183 GHz water vapor absorption band is tested. A novel method to calculate the effects of turbulence in radiative transfer modeling is presented. It is shown that the turbulent nature of water vapor in the atmosphere can be a critical component of radiative transfer modeling in this band. Radiative transfer simulations are performed comparing a uniform field with a turbulent one. These comparisons show frequency dependent biases which can be up to several kelvin in brightness temperature. These biases can match experimentally observe…

PhysicsAtmospheric Science010504 meteorology & atmospheric sciencesTurbulencelcsh:TA715-787lcsh:Earthwork. Foundations0211 other engineering and technologies02 engineering and technology01 natural sciencesClear-air turbulenceComputational physicslaw.inventionlcsh:Environmental engineeringPhysics::Fluid DynamicsTroposphereAtmospherelawBrightness temperatureRadiosondeRadiative transferlcsh:TA170-171Water vaporPhysics::Atmospheric and Oceanic Physics021101 geological & geomatics engineering0105 earth and related environmental sciencesAtmospheric Measurement Techniques
researchProduct

Nitric acid trihydrate nucleation and denitrification in the Arctic stratosphere

2014

Abstract. Nitric acid trihydrate (NAT) particles in the polar stratosphere have been shown to be responsible for vertical redistribution of reactive nitrogen (NOy). Recent observations by Cloud–Aerosol Lidar with Orthogonal Polarization (CALIOP) aboard the CALIPSO satellite have been explained in terms of heterogeneous nucleation of NAT on foreign nuclei, revealing this to be an important formation pathway for the NAT particles. In state of the art global- or regional-scale models, heterogeneous NAT nucleation is currently simulated in a very coarse manner using a constant, saturation-independent nucleation rate. Here we present first simulations for the Arctic winter 2009/2010 applying a n…

Atmospheric ScienceDenitrification010504 meteorology & atmospheric sciencesForward scatterNucleationAtmospheric sciences01 natural sciences010309 opticslcsh:Chemistry0103 physical sciencesddc:550Life ScienceStratosphere0105 earth and related environmental sciencesSpectrometerozone holeChemistryAtmosphärische Spurenstoffelcsh:QC1-999Earth sciencesLidarnitric acid trihydratelcsh:QD1-99913. Climate actionPolarParticle sizelcsh:PhysicsArctic stratosphere
researchProduct

Retrieval of atmospheric CH4profiles from Fourier transform infrared data using dimension reduction and MCMC

2016

We introduce an inversion method that uses dimension reduction for the retrieval of atmospheric methane (CH4) profiles. Uncertainty analysis is performed using the Markov chain Monte Carlo (MCMC) statistical estimation. These techniques are used to retrieve CH4 profiles from the ground-based spectral measurements by the Fourier Transform Spectrometer (FTS) instrument at Sodankyla (67.4 degrees N, 26.6 degrees E), Northern Finland. The Sodankyla FTS is part of the Total Carbon Column Observing Network (TCCON), a global network that observes solar spectra in near-infrared wavelengths. The high spectral resolution of the data provides approximately 3 degrees of freedom about the vertical struc…

Atmospheric Science010504 meteorology & atmospheric sciencesComputer scienceDegrees of freedom (statistics)Inverse transform samplingMarkov chain Monte CarloInverse problem01 natural sciences010104 statistics & probabilitysymbols.namesakeGeophysicsFourier transformSpace and Planetary SciencePrincipal component analysisEarth and Planetary Sciences (miscellaneous)symbols0101 mathematicsTotal Carbon Column Observing NetworkUncertainty analysis0105 earth and related environmental sciencesRemote sensingJournal of Geophysical Research: Atmospheres
researchProduct