Articles | Volume 15, issue 10
https://doi.org/10.5194/amt-15-3075-2022
https://doi.org/10.5194/amt-15-3075-2022
Research article
 | 
18 May 2022
Research article |  | 18 May 2022

Boundary-layer height and surface stability at Hyytiälä, Finland, in ERA5 and observations

Victoria Anne Sinclair, Jenna Ritvanen, Gabin Urbancic, Irene Erner, Yurii Batrak, Dmitri Moisseev, and Mona Kurppa

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Cited articles

Aalto, J., Aalto, P., Keronen, P., Kolari, P., Rantala, P., Taipale, R., Kajos, M., Patokoski, J., Rinne, J., Ruuskanen, T., Leskinen, M., Laakso, H., Levula, J., Pohja, T., Siivola, E., Kulmala, M., and Ylivinkka, I.: SMEAR II Hyytiälä forest meteorology, greenhouse gases, air quality and soil (Version 2), University of Helsinki, Institute for Atmospheric and Earth System Research, Fairdata [data set], https://doi.org/10.23729/62f7ad2c-7fe0-4f66-b0a4-8d57c80524ec, 2022. a
Atmospheric Radiation Measurement (ARM) user facility: Balloon-Borne Sounding System (SONDEWNPN), 2014-02-01 to 2014-09-12, ARM Mobile Facility (TMP), University of Helsinki Research Station (SMEAR II), Hyytiala, Finland; AMF2 (M1), Compiled by Keeler, E., Coulter, R., and Kyrouac, J., ARM Data Center [data set], https://doi.org/10.5439/1021460, 2014a. a
Atmospheric Radiation Measurement (ARM) user facility: Planetary Boundary Layer Height (PBLHTSONDE1MCFARL), 2014-02-01 to 2014-09-12, ARM Mobile Facility (TMP), University of Helsinki Research Station (SMEAR II), Hyytiala, Finland; AMF2 (M1), Compiled by Riihimaki, L. and Zhang, D., ARM Data Center [data set], https://doi.org/10.5439/1150253, 2014b. a
Baars, H., Ansmann, A., Engelmann, R., and Althausen, D.: Continuous monitoring of the boundary-layer top with lidar, Atmos. Chem. Phys., 8, 7281–7296, https://doi.org/10.5194/acp-8-7281-2008, 2008. a
Bäck, J., Aalto, J., Henriksson, M., Hakola, H., He, Q., and Boy, M.: Chemodiversity of a Scots pine stand and implications for terpene air concentrations, Biogeosciences, 9, 689–702, https://doi.org/10.5194/bg-9-689-2012, 2012. a
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Short summary
We investigate the boundary-layer (BL) height and surface stability in southern Finland using radiosondes, a microwave radiometer and ERA5 reanalysis. Accurately quantifying the BL height is challenging, and the diagnosed BL height can depend strongly on the method used. Microwave radiometers provide reliable estimates of the BL height but only in unstable conditions. ERA5 captures the BL height well except under very stable conditions, which occur most commonly at night during the warm season.