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Atmospheric River Signatures in Radiosonde Profiles and Reanalyses at the Dronning Maud Land Coast,East Antarctica

Advances in Atmospheric Sciences 2020年第5期37卷 455-476页

作者： Irina V.GORODETSKAYA Tiago SILVA holger schmithusen Naohiko HIRASAWA Centre for Environmental and Marine Studies(CESAM) Department of PhysicsUniversity of AveiroAveiro 3810-193Portugal Department of Atmospheric and Cryospheric Sciences University of InnsbruckInnsbruck 6020Austria Alfred Wegener Institute Helmholtz Centre for Polar and Marine ResearchBremerhaven 27570Germany National Institute of Polar Research Tachikawa 190-8518Japan SOKENDAI(Graduate University for Advanced Studies) Hayama 240-0193Japan

Atmospheric rivers(ARs)are an important component of the hydrological cycle linking moisture sources in lower latitudes to the Antarctic surface mass *** investigate AR signatures in the atmospheric vertical profiles at the Dronning Maud Land coast,East Antarctica,using regular and extra radiosonde measurements conducted during the Year of Polar Prediction Special Observing Period November 2018 to February *** AR events affecting the locations of Neumayer and Syowa cause a strong increase in specific humidity extending through the mid-troposphere and a strong low-level jet(LLJ).At Neumayer,the peak in the moisture inversion(up to 4 g kg^?1)is observed between 800 and 900 hPa,while the LLJ(up to 32 m s^?1)is concentrated below 900 *** Syowa the increase in humidity is less pronounced and peaks near the surface,while there is a substantial increase in wind speed(up to 40 m s?1)between 825 and 925 *** transport(MT)within the vertical profile during the ARs attains a maximum of 100 g kg?1 m s?1 at both locations,and is captured by both ERA-Interim and ERA5 reanalysis data at Neumayer,but is strongly underestimated at *** of the enhanced MT events during 2009?19 show that these events represent an extreme state of the lower-tropospheric profile compared to its median values with respect to temperature,humidity,wind speed and,consequently,*** temporal-and vertical-resolution radiosonde observations are important for understanding the contribution of these rare events to the total MT towards Antarctica and improving their representation in models.

关键词： Antarctica moisture transport radiosonde observations YOPP-SOP-SH reanalysis

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