Elucidation of spatiotemporal structures from high-resolution blowing-snow observations

Autor: K. Nishimura, M. Nemoto, Y. Ito, S. Omiya, K. Shimoyama, H. Niiya
Jazyk: angličtina
Rok vydání: 2024
Předmět:
Zdroj: The Cryosphere, Vol 18, Pp 4775-4786 (2024)
Druh dokumentu: article
ISSN: 1994-0416
1994-0424
DOI: 10.5194/tc-18-4775-2024
Popis: Systematic observations were conducted to investigate the spatiotemporal structures of blowing snow. Along a line perpendicular to the dominant wind direction on the lee side of a flat field, 15 snow particle counters (SPCs) and ultrasonic anemometers (USAs) were placed 1.5 m apart. Data were recorded at high frequencies of 100 kHz for SPCs and 1 kHz for USAs. The horizontal mass flux distributions, representing the spatiotemporal variability of blowing snow, exhibited non-uniformity in both time and space and manifested periodic changes akin to snow waves. Additionally, the presence of “snow snakes”, meandering near the snow surface, was observed. Quadrant analysis revealed predominant snow fluxes in quadrants Q1 (u′>0, w′>0) and Q4 (u′>0, w′<0). However, a more detailed parametric curve analysis indicated the existence of ejection events in Q2 (u′<0, w′>0) before snow waves and in front of snow snakes, shifting to Q1 and Q4 afterward, implying the consideration of both top-down and bottom-up mechanisms for burst sweep events.
Databáze: Directory of Open Access Journals
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