In situ sounding of radiative flux profiles through the Arctic lower troposphere


Contact
Marion.Maturilli [ at ] awi.de

Abstract

In situ profiles and fixed-altitude time series of all four components of net radiation were obtained at Ny-Ålesund, Svalbard (78.9° N, 11.9° E), in the period May 04–21, 2015. Measurements were performed using adapted high-quality instrumentation classified as “secondary standard” carried by a tethered balloon system. Balloon-lifted measurements of albedo under clear-sky conditions demonstrate the local dependence on altitude and on the surface inhomogeneity of this parameter over coastal terrain of Ny-Ålesund. Depending on the surface composition within the sensor’s footprint near the coastline, the albedo over predominantly snow-covered surfaces was found to decrease to 0.548 and 0.452 at 494 m and 881 m altitude compared with 0.731 and 0.788 measured with near-surface references, respectively. Albedo profiles show an all-sky maximum at 150 m above surface level due to local surface inhomogeneity, and an averaged vertical change rate of − 0.040/100 up to 750 m aboveground level (clear sky) and − 0.034/100 m (overcast). Profiling of arctic low-level clouds reveals distinct vertical gradients in all radiative fluxes but longwave upward at the cloud top. Observed radiative cooling at the top of a partly dissolving stratus cloud with heating rates of − 40.4 to − 62.1 Kd−1 in subsequent observations is exemplified.



Item Type
Article
Authors
Divisions
Primary Division
Programs
Primary Topic
Research Networks
Peer revision
ISI/Scopus peer-reviewed
Publication Status
Published
Eprint ID
52016
DOI 10.1007/s42865-020-00011-8

Cite as
Becker, R. , Maturilli, M. , Philipona, R. and Behrens, K. (2020): In situ sounding of radiative flux profiles through the Arctic lower troposphere , Bulletin of Atmospheric Science and Technology . doi: 10.1007/s42865-020-00011-8


Download
[img]
Preview
PDF
s42865-020-00011-8.pdf

Download (3MB) | Preview

Share


Citation

Research Platforms

Campaigns


Actions
Edit Item Edit Item