Publication Date:
2023-08-16
Description:
Monitoring ocean and atmospheric conditions on the sea surface is indispensable for understanding atmosphere-ocean interaction, but there is now a significant spatio-temporal gap in the observing system. These days, biologging, which is a method to measure animals’ movement or their environment by attaching a small data logger to their body, has been attracting as a new way of meteorological observation to fill the gap. In particular, a revolutionary method, in which we can simultaneously estimate the bird’s orientation and their environmental wind from their flight paths, was proposed. In this research, we used ocean surface winds in the summer of 2018 estimated by this method using GPS positional data of streaked shearwaters which build a nest in Awashima island, Japan. We conducted an Observing System Experiment (OSE) , running analysis-forecast cycles with and without the bird-wind data (named BIRD and CTRL, respectively) and examined those observation impacts. The regional reanalysis system we used is NHM-LETKF, which combined JMA’s non-hydrostatic model (NHM) with the local ensemble transform Kalman filter (LETKF) as the data assimilation method. We compared the surface wind spread of BIRD with that of CTRL averaged in the calculation period. Bird observation points were distributed along the coast from Japan-Sea to southern Hokkaido, and these observation impacts propagated to the northern part of Japan-Sea and the western pacific. Also, three typhoons passed on and around Japan during this period, and these central pressures or courses differed from BIRD to CTRL. We will discuss the observation impacts on these typhoons.
Language:
English
Type:
info:eu-repo/semantics/conferenceObject
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