A Case Study of a Wintertime Low-Level Jet Associated with a Downslope Wind Event at the Tiksi Observatory (Laptev Sea, Siberia) DOI Creative Commons
Günther Heinemann

Meteorology, Год журнала: 2025, Номер 4(1), С. 7 - 7

Опубликована: Март 18, 2025

Low-level jets (LLJs) are important features in the Arctic atmospheric boundary layer (ABL). In present paper, a LLJ event during winter 2014/15 is investigated, which was observed at Tiksi observatory (71.586° N, 128.918° E, 7 m asl) Laptev Sea region. Besides routine synoptic observations, data from meteorological tower and SODAR/RASS (sound detection ranging/radio acoustic sounding system) were available. The latter yielded vertical profiles of wind temperature ABL with resolution 10 temporal 20 min. addition to measurements, simulations performed using regional climate model CCLM 5 km resolution. run nesting ERA5 forecast mode, measurements used for comparison occurring 31 December 2014 1 January 2015. agreed well near-surface SODAR observations represented development very well. showed that part downslope structures over large flow preconditioned by barrier channeling Lena Valley initial phase, but forcing low dominated mature dissipation phases LLJ. High turbulence intensity occurred phase LLJ, seemed be associated wave breaking. Downslope events likely reason most LLJs Tiksi.

Язык: Английский

A Case Study of a Wintertime Low-Level Jet Associated with a Downslope Wind Event at the Tiksi Observatory (Laptev Sea, Siberia) DOI Creative Commons
Günther Heinemann

Meteorology, Год журнала: 2025, Номер 4(1), С. 7 - 7

Опубликована: Март 18, 2025

Low-level jets (LLJs) are important features in the Arctic atmospheric boundary layer (ABL). In present paper, a LLJ event during winter 2014/15 is investigated, which was observed at Tiksi observatory (71.586° N, 128.918° E, 7 m asl) Laptev Sea region. Besides routine synoptic observations, data from meteorological tower and SODAR/RASS (sound detection ranging/radio acoustic sounding system) were available. The latter yielded vertical profiles of wind temperature ABL with resolution 10 temporal 20 min. addition to measurements, simulations performed using regional climate model CCLM 5 km resolution. run nesting ERA5 forecast mode, measurements used for comparison occurring 31 December 2014 1 January 2015. agreed well near-surface SODAR observations represented development very well. showed that part downslope structures over large flow preconditioned by barrier channeling Lena Valley initial phase, but forcing low dominated mature dissipation phases LLJ. High turbulence intensity occurred phase LLJ, seemed be associated wave breaking. Downslope events likely reason most LLJs Tiksi.

Язык: Английский

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