Cooperative Institute for Research in Environmental Sciences at the University of Colorado Boulder

Joseph Sedlar

Position

Research Scientist at NOAA

Research Group

Jennifer Kay Group

Education

  • 2011 Ph.D. in Atmospheric Science, Stockholm University
  • 2006 M.Sc. in Atmospheric Science, Stockholm University
  • 2004 B.Sc. in Atmospheric Science, University of Wisconsin-Milwaukee

Contact

joseph.sedlar@Colorado.EDU

Files

PDF icon cv_jas.pdf

Also on the web

NOAA Profile

View Publications

  • Balmes KA; Sedlar J; Riihimaki LD; Olson JB; Turner DD; Lantz K. (Mar 2023). Regime?specific Cloud Vertical Overlap Characteristics from Radar and Lidar Observations at the ARM sites. Journal of Geophysical Research: Atmospheres. 10.1029/2022jd037772
  • Sterzinger LJ; Sedlar J; Guy H; Neely III RR; Igel AL. (Jul 2022). Do Arctic mixed-phase clouds sometimes dissipate due to insufficient aerosol? Evidence from comparisons between observations and idealized simulations. Atmospheric Chemistry and Physics , 22(13), 8973-8988. 10.5194/acp-22-8973-2022
  • Duncan Jr. JB; Bianco L; Adler B; Bell T; Djalalova IV; Riihimaki L; Sedlar J; Smith EN; Turner DD; Wagner TJ. (Apr 2022). Evaluating daytime planetary boundary-layer height estimations resolved by both active and passive remote sensing instruments during the CHEESEHEAD19 field campaign. Atmospheric Measurement Techniques. 10.5194/amt-15-2479-2022
  • Sedlar J; Riihimaki LD; Turner DD; Duncan J; Adler B; Bianco L; Lantz K; Wilczak J; Hall E; Herrera C. (Feb 2022). Investigating the impacts of daytime boundary layer clouds on surface energy fluxes and boundary layer structure during CHEESEHEAD19. Journal of Geophysical Research: Atmospheres. 10.1029/2021jd036060
  • Sedlar J; Riihimaki LD; Lantz K; Turner DD. (Apr 2021). Development of a Random-Forest Cloud-Regime Classification Model Based on Surface Radiation and Cloud Products. Journal of Applied Meteorology and Climatology , 60(4), 477-491. 10.1175/JAMC-D-20-0153.1
  • Sedlar J; Igel A; Telg H. (Mar 2021). Processes contributing to cloud dissipation and formation events on the North Slope of Alaska. Atmospheric Chemistry and Physics , 21(5), 4149-4167. 10.5194/acp-21-4149-2021
  • Butterworth BJ; Desai AR; Metzger S; Townsend PA; Schwartz MD; Petty GW; Mauder M; Vogelmann H; Andresen CG; Augustine TJ. (Feb 2021). Connecting Land-Atmosphere Interactions to Surface Heterogeneity in CHEESEHEAD19. Bulletin of the American Meteorological Society , 102(2), E421-E445. 10.1175/BAMS-D-19-0346.1
  • Sedlar J; Tjernstrom M; Rinke A; Orr A; Cassano J; Fettweis X; Heinemann G; Seefeldt M; Solomon A; Matthes H. (Mar 2020). Confronting Arctic Troposphere, Clouds, and Surface Energy Budget Representations in Regional Climate Models With Observations. Journal of Geophysical Research: Atmospheres , 125(6). 10.1029/2019JD031783
  • Karlsson K-G; Johansson E; Hakansson N; Sedlar J; Eliasson S. (Feb 2020). Probabilistic Cloud Masking for the Generation of CM SAF Cloud Climate Data Records from AVHRR and SEVIRI Sensors. Remote Sensing , 12(4). 10.3390/rs12040713
  • Sedlar, J; Tjernstrom, M. (Aug 2019). A Process-Based Climatological Evaluation of AIRS Level 3 Tropospheric Thermodynamics over the High-Latitude Arctic. JOURNAL OF APPLIED METEOROLOGY AND CLIMATOLOGY , 58(8). 10.1175/JAMC-D-18-0306.1
  • Naakka, T; Nygard, T; Vihma, T; Sedlar, J; Graversen, R. (May 2019). Atmospheric moisture transport between mid-latitudes and the Arctic: Regional, seasonal and vertical distributions. INTERNATIONAL JOURNAL OF CLIMATOLOGY , 39(6). 10.1002/joc.5988
  • Tjernstrom, M; Shupe, MD; Brooks, IM; Achtert, P; Prytherch, J; Sedlar, J. (Feb 2019). Arctic Summer Airmass Transformation, Surface Inversions, and the Surface Energy Budget. JOURNAL OF CLIMATE , 32(3). 10.1175/JCLI-D-18-0216.1
  • Sotiropoulou G; Tjernstrom M; Savre J; Ekman AML; Hartung K; Sedlar J. (Oct 2018). Large-eddy simulation of a warm-air advection episode in the summer Arctic. Quarterly Journal of the Royal Meteorological Society , 144(717), 2449-2462. 10.1002/qj.3316
  • Sedlar, J. (Jun 2018). Spring Arctic Atmospheric Preconditioning: Do Not Rule Out Shortwave Radiation Just Yet. JOURNAL OF CLIMATE , 31(11). 10.1175/JCLI-D-17-0710.1
  • Brooks, IM, M Tjernstrom, POG Persson, MD Shupe, RA Atkinson, G Canut, CE Birch, T Mauritsen, J Sedlar and BJ Brooks. (Sep 2017). The Turbulent Structure of the Arctic Summer Boundary Layer During The Arctic Summer Cloud-Ocean Study. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES , 122(18). 10.1002/2017JD027234
  • Igel AL; Ekman AML; Leck C; Tjernstrom M; Savre J; Sedlar J. (Jul 2017). The free troposphere as a potential source of arctic boundary layer aerosol particles. Geophysical Research Letters , 44(13), 7053-7060. 10.1002/2017GL073808
  • Loewe K; Ekman AML; Paukert M; Sedlar J; Tjernstrom M; Hoose C. (Jun 2017). Modelling micro- and macrophysical contributors to the dissipation of an Arctic mixed-phase cloud during the Arctic Summer Cloud Ocean Study (ASCOS). Atmospheric Chemistry and Physics , 17(11), 6693-6704. 10.5194/acp-17-6693-2017
  • Karlsson K-G; Anttila K; Trentmann J; Stengel M; Meirink JF; Devasthale A; Hanschmann T; Kothe S; Jaaskelainen E; Sedlar J. (May 2017). CLARA-A2: the second edition of the CM SAF cloud and radiation data record from 34 years of global AVHRR data. Atmospheric Chemistry and Physics , 17(9), 5809-5828. 10.5194/acp-17-5809-2017
  • Sedlar J; Tjernstrom M. (Jan 2017). Clouds, warm air, and a climate cooling signal over the summer Arctic. Geophysical Research Letters , 44(2), 1095-1103. 10.1002/2016GL071959
  • Sotiropoulou, G, M Tjernstrom, J Sedlar, P Achtert, BJ Brooks, IM Brooks, POG Persson, J Prytherch, DJ Salisbury, MD Shupe, PE Johnston and D Wolfe. (Dec 2016). Atmospheric Conditions during the Arctic Clouds in Summer Experiment (ACSE): Contrasting Open Water and Sea Ice Surfaces during Melt and Freeze-Up Seasons. JOURNAL OF CLIMATE , 29(24). 10.1175/JCLI-D-16-0211.1
  • Devasthale A; Sedlar J; Kahn BH; Tjernstrom M; Fetzer EJ; Tian B; Teixeira J; Pagano TS. (Nov 2016). A DECADE OF SPACEBORNE OBSERVATIONS OF THE ARCTIC ATMOSPHERE Novel. Insights from NASA's AIRS Instrument. Bulletin of the American Meteorological Society , 97(11), 2163-2176. 10.1175/BAMS-D-14-00202.1
  • Leung W-YH; Savre J; Bender FA-M; Komppula M; Portin H; Romakkaniemi S; Sedlar J; Noone K; Ekman AML. (Oct 2016). Sensitivity of a continental night-time stratocumulus-topped boundary layer to varying environmental conditions. Quarterly Journal of the Royal Meteorological Society , 142(700), 2911-2924. 10.1002/qj.2877
  • Sotiropoulou G; Sedlar J; Forbes R; Tjernstrom M. (Jan 2016). Summer Arctic clouds in the ECMWF forecast model: an evaluation of cloud parametrization schemes. Quarterly Journal of the Royal Meteorological Society , 142(694), 387-400. 10.1002/qj.2658
  • Tjernstrom, M, MD Shupe, IM Brooks, POG Persson, J Prytherch, DJ Salisbury, J Sedlar, P Achtert, BJ Brooks, PE Johnston, G Sotiropoulou and D Wolfe. (Jul 2015). Warm-air advection, air mass transformation and fog causes rapid ice melt. GEOPHYSICAL RESEARCH LETTERS , 42(13). 10.1002/2015GL064373
  • Sedlar J. (Dec 2014). Implications of Limited Liquid Water Path on Static Mixing within Arctic Low-Level Clouds. Journal of Applied Meteorology and Climatology , 53(12), 2775-2789. 10.1175/JAMC-D-14-0065.1
  • Vihma T; Pirazzini R; Fer I; Renfrew IA; Sedlar J; Tjernstrom M; Luepkes C; Nygard T; Notz D; Weiss J. (Jan 2014). Advances in understanding and parameterization of small-scale physical processes in the marine Arctic climate system: a review. Atmospheric Chemistry and Physics , 14(17), 9403-9450. 10.5194/acp-14-9403-2014
  • Tjernstrom, M, C Leck, CE Birch, JW Bottenheim, BJ Brooks, IM Brooks, L Backlin, YW Chang, G de Leeuw, L Di Liberto, S de la Rosa, E Granath, M Graus, A Hansel, J Heintzenberg, A Held, A Hind, P Johnston, J Knulst, M Martin, PA Matrai, T Mauritsen, M Muller, SJ Norris, MV Orellana, DA Orsini, J Paatero, POG Persson, Q Gao, C Rauschenberg, Z Ristovski, J Sedlar, MD Shupe, B Sierau, A Sirevaag, S Sjogren, O Stetzer, E Swietlicki, M Szczodrak, P Vaattovaara, N Wahlberg, M Westberg and CR Wheeler. (Jan 2014). The Arctic Summer Cloud Ocean Study (ASCOS): overview and experimental design. ATMOSPHERIC CHEMISTRY AND PHYSICS , 14(6). 10.5194/acp-14-2823-2014
  • Sedlar, J and MD Shupe. (Jan 2014). Characteristic nature of vertical motions observed in Arctic mixed-phase stratocumulus. ATMOSPHERIC CHEMISTRY AND PHYSICS , 14(7). 10.5194/acp-14-3461-2014
  • Sotiropoulou, G, J Sedlar, M Tjernstrom, MD Shupe, IM Brooks and POG Persson. (Jan 2014). The thermodynamic structure of summer Arctic stratocumulus and the dynamic coupling to the surface. ATMOSPHERIC CHEMISTRY AND PHYSICS , 14(22). 10.5194/acp-14-12573-2014
  • Devasthale A; Sedlar J; Koenigk T; Fetzer EJ. (Aug 2013). The thermodynamic state of the Arctic atmosphere observed by AIRS: comparisons during the record minimum sea ice extents of 2007 and 2012. Atmospheric Chemistry and Physics , 13(15), 7441-7450. 10.5194/acp-13-7441-2013
  • Karlsson K-G; Riihelä A; Müller R; Meirink JF; Sedlar J; Stengel M; Lockhoff M; Trentmann J; Kaspar F; Hollmann R. (May 2013). CLARA-A1: a cloud, albedo, and radiation dataset from 28 yr of global AVHRR data. Atmospheric Chemistry and Physics , 13(10), 5351-5367. 10.5194/acp-13-5351-2013
  • Kupiszewski P; Leck C; Tjernstrom M; Sjogren S; Sedlar J; Graus M; Mueller M; Brooks B; Swietlicki E; Norris S. (Jan 2013). Vertical profiling of aerosol particles and trace gases over the central Arctic Ocean during summer. Atmospheric Chemistry and Physics , 13(24), 12405-12431. 10.5194/acp-13-12405-2013
  • Shupe, MD, POG Persson, IM Brooks, M Tjernstrom, J Sedlar, T Mauritsen, S Sjogren and C Leck. (Jan 2013). Cloud and boundary layer interactions over the Arctic sea ice in late summer. ATMOSPHERIC CHEMISTRY AND PHYSICS , 13(18). 10.5194/acp-13-9379-2013
  • Sedlar J; Devasthale A. (Oct 2012). Clear-sky thermodynamic and radiative anomalies over a sea ice sensitive region of the Arctic. Journal of Geophysical Research: Atmospheres , 117. 10.1029/2012JD017754
  • Sedlar, J, MD Shupe and M Tjernstrom. (Apr 2012). On the Relationship between Thermodynamic Structure and Cloud Top, and Its Climate Significance in the Arctic. JOURNAL OF CLIMATE , 25(7). 10.1175/JCLI-D-11-00186.1
  • Birch, CE, IM Brooks, M Tjernstrom, MD Shupe, T Mauritsen, J Sedlar, AP Lock, P Earnshaw, POG Persson, SF Milton and C Leck. (Jan 2012). Modelling atmospheric structure, cloud and their response to CCN in the central Arctic: ASCOS case studies. ATMOSPHERIC CHEMISTRY AND PHYSICS , 12(7). 10.5194/acp-12-3419-2012
  • Tjernstrom, M, CE Birch, IM Brooks, MD Shupe, POG Persson, J Sedlar, T Mauritsen, C Leck, J Paatero, M Szczodrak and CR Wheeler. (Jan 2012). Meteorological conditions in the central Arctic summer during the Arctic Summer Cloud Ocean Study (ASCOS). ATMOSPHERIC CHEMISTRY AND PHYSICS , 12(15). 10.5194/acp-12-6863-2012
  • Sedlar, J, M Tjernstrom, T Mauritsen, MD Shupe, IM Brooks, POG Persson, CE Birch, C Leck, A Sirevaag and M Nicolaus. (Oct 2011). A transitioning Arctic surface energy budget: the impacts of solar zenith angle, surface albedo and cloud radiative forcing. CLIMATE DYNAMICS , 37(8-Jul). 10.1007/s00382-010-0937-5
  • Devasthale A; Tjernstrom M; Karlsson K-G; Thomas MA; Jones C; Sedlar J; Omar AH. (Feb 2011). The vertical distribution of thin features over the Arctic analysed from CALIPSO observations. Tellus Series B: Chemical and Physical Meteorology , 63(1), 77-85. 10.1111/j.1600-0889.2010.00516.x
  • Devasthale A; Sedlar J; Tjernstrom M. (Jan 2011). Characteristics of water-vapour inversions observed over the Arctic by Atmospheric Infrared Sounder (AIRS) and radiosondes. Atmospheric Chemistry and Physics , 11(18), 9813-9823. 10.5194/acp-11-9813-2011
  • Mauritsen, T, J Sedlar, M Tjernstrom, C Leck, M Martin, M Shupe, S Sjogren, B Sierau, POG Persson, IM Brooks and E Swietlicki. (Jan 2011). An Arctic CCN-limited cloud-aerosol regime. ATMOSPHERIC CHEMISTRY AND PHYSICS , 11(1). 10.5194/acp-11-165-2011
  • Sedlar J; Tjernstrom M. (Sep 2009). Stratiform Cloud-Inversion Characterization During the Arctic Melt Season. Boundary-Layer Meteorology: an international journal of physical and biological processes in the atmospheric boundary layer , 132(3), 455-474. 10.1007/s10546-009-9407-1
  • Sedlar J; Hock R. (Jan 2009). Testing longwave radiation parameterizations under clear and overcast skies at Storglaciaren, Sweden. The Cryosphere , 3(1), 75-84. 10.5194/tc-3-75-2009
  • Tjernstrom, M, J Sedlar and MD Shupe. (Sep 2008). How well do regional climate models reproduce radiation and clouds in the Arctic? An evaluation of ARCMIP simulations. JOURNAL OF APPLIED METEOROLOGY AND CLIMATOLOGY , 47(9). 10.1175/2008JAMC1845.1
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