Vertical structure of low-level atmosphere over the southeast Indian Ocean fronts

Lin, Feng and Lin, Liu and Libao, Gao and Weidong, Yu (2012) Vertical structure of low-level atmosphere over the southeast Indian Ocean fronts. Advances in Polar Science, 23 (3). pp. 163-169.

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Abstract

During the 25th Chinese National Antarctic Research Expedition, GPS radiosondes were launched to detect the atmospheric vertical structure over the southeast Indian Ocean frontal region. Some low-level characteristics along the cruise are studied based on in-situ observation. The observations reveal that vertical distributions of the low-level wind field and air temperature field on both sides of the Subantarctic Front are very different. A stronger (weaker) vertical gradient is on the cold (warm) side, which demonstrates that the mid-latitude ocean-atmosphere interaction is active in the southeast Indian Ocean frontal region. A low-level jet is observed over the Subantarctic Front, with speed up to 14 m·s-1. For the Antarctic polar front, low-level wind speed near the sea surface is greater than that aloft, in contrast with the situation of the Subantarctic Front. Comparing satellite remote sensing data and widely-used reanalysis datasets with our in-situ observations, differences of varying magnitudes are found. Air temperature from Atmospheric Infrared Sounder (AIRS) data has a limited difference. The European Center for Medium Range Weather Forecasts Interim Re-Analysis (ERA Interim) dataset is much more consistent with the observations than the National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) Reanalysis 1 in the southeast Indian Ocean frontal region.

Item Type:	Article
Related URLs:
Keywords:	Subantarctic Front, Antarctic polar front, wind speed, air temperature
Subjects:	Natural Environment > Atmosphere Natural Environment > Oceans
Organizations:	Unspecified
Date Deposited:	25 Sep 2023 14:45
URI:	http://library.arcticportal.org/id/eprint/2461

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