TITLE:
Migration of Source Locations and Arrival Orientations for Infrasound Excitation in the Lützow-Holm Bay, Antarctica: January - April 2017
AUTHORS:
Takahiko Murayama, Masaki Kanao, Masa-Yuki Yamamoto
KEYWORDS:
Infrasound, Array Analyses, Antarctica, Katabatic Winds, Microbaroms, Sea-Ice Dynamics
JOURNAL NAME:
InfraMatics,
Vol.4 No.1,
October
27,
2023
ABSTRACT: Predominant phenomenon of the
migration in source locations and arrival orientations for infrasound excitation was clearly
identified by using a combination of
two arrays deployed at the coast of the Lützow-Holm Bay (LHB), Antarctica during the period from January to April in 2017. A
few tens of infrasound source locations were determined in several
individual days during four months in 2017.
These identified source locations appeared to be migrated from the north-east direction to the
north-west direction from January to
April in 2017, the evidence assumed to be caused by time-offset effects between
katabatic winds from continental ice sheet and the microbaroms from the LHB, based on comparison
with oceanic wave heights around Antarctica and Southern Indian Ocean
calculated by the wave model (WAM). The latter source locations in the
north-west direction were also considered to be related with the sea-ice
dynamics involving collapse and/or discharge from the LHB to the Ocean by
comparison with MODIS satellite image.