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

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

doi:https://doi.org/10.5194/amt-15-3075-2022

Articles | Volume 15, issue 10

https://doi.org/10.5194/amt-15-3075-2022

© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/amt-15-3075-2022

© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 15, issue 10

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

Supplement

https://doi.org/10.5194/amt-15-3075-2022-supplement

Data sets

SMEAR II Hyytiälä forest meteorology, greenhouse gases, air quality and soil (Version 2) J. Aalto, P. Aalto, P. Keronen, P. Kolari, P. Rantala, R. Taipale, M. Kajos, J. Patokoski, J. Rinne, T. Ruuskanen, M. Leskinen, H. Laakso, J. Levula, T. Pohja, E. Siivola, M. Kulmala, and I. Ylivinkka https://doi.org/10.23729/62f7ad2c-7fe0-4f66-b0a4-8d57c80524ec

Balloon-Borne Sounding System (SONDEWNPN) Atmospheric Radiation Measurement (ARM) user facility https://doi.org/10.5439/1021460

Planetary Boundary Layer Height (PBLHTSONDE1MCFARL) Atmospheric Radiation Measurement (ARM) user facility https://doi.org/10.5439/1150253

ERA5 hourly data on single levels from 1979 to present H. Hersbach, B. Bell, P. Berrisford, G. Biavati, A. Horányi, J. Muñoz Sabater, J. Nicolas, C. Peubey, R. Radu, I. Rozum, D. Schepers, A. Simmons, C. Soci, D. Dee, and J.-N. Thépaut https://doi.org/10.24381/cds.adbb2d47

Cloud profiling product Classification CLU https://hdl.handle.net/21.12132/1.d28c281574434f92

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.