Observations of Wintertime Low-Level Jets in the Coastal Region of the Laptev Sea in the Siberian Arctic Using SODAR/RASS.

Heinemann, Günther, Drüe, Clemens, Schwarz, Pascal and Makshtas, Alexander (2021) Observations of Wintertime Low-Level Jets in the Coastal Region of the Laptev Sea in the Siberian Arctic Using SODAR/RASS. Open Access Remote Sensing, 13 (8). Art.Nr. 1421. DOI 10.3390/rs13081421.

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Abstract

In 2014/2015 a one-year field campaign at the Tiksi observatory in the Laptev Sea area was carried out using Sound Detection and Ranging/Radio Acoustic Sounding System (SODAR/RASS) measurements to investigate the atmospheric boundary layer (ABL) with a focus on low-level jets (LLJ) during the winter season. In addition to SODAR/RASS-derived vertical profiles of temperature, wind speed and direction, a suite of complementary measurements at the Tiksi observatory was available. Data of a regional atmospheric model were used to put the local data into the synoptic context. Two case studies of LLJ events are presented. The statistics of LLJs for six months show that in about 23% of all profiles LLJs were present with a mean jet speed and height of about 7 m/s and 240 m, respectively. In 3.4% of all profiles LLJs exceeding 10 m/s occurred. The main driving mechanism for LLJs seems to be the baroclinicity, since no inertial oscillations were found. LLJs with heights below 200 m are likely influenced by local topography.

Document Type: Article
Keywords: low-level jets; SODAR/RASS; atmospheric boundary layer; Laptev Sea
Refereed: Yes
Open Access Journal?: Yes
Publisher: MDPI
Projects: CATS
Date Deposited: 25 Jun 2021 12:55
Last Modified: 08 Feb 2023 09:42
URI: https://oceanrep.geomar.de/id/eprint/53000

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