期刊名称：Tellus A: Dynamic Meteorology and Oceanography
电子版ISSN：1600-0870
出版年度：2019
卷号：71
期号：1
页码：1-10
DOI：10.1080/16000870.2019.1591856
摘要：In the summer Arctic, bump-like vertical temperature profiles of the upper layer in the Canada Basin suggest
a near-surface temperature maximum (NSTM) beneath the mixed layer. This paper concentrates on
describing the decadal variance of these NSTMs. Essentially, the temporal evolution of the summer NSTM
revealed three decadal phases. The first period is before 2003, when the summer NSTM could rarely be
observed except around the marginal of the Canada Basin. The second period is between 2003 and 2015,
when the summer NSTM nearly occurred over the whole basin as accelerated decline of summer sea ice. The
third period is from 2016 to 2017, when the summer NSTM almost disappeared due to prevailing warm
surface water. Furthermore, for the background behind the decadal variance of summer NSTM, linear trends
of the September minimum sea ice extent and surface water heat content in the Canada Basin from 2003 to
2017 were –2.75 ± 1.08 104 km2
yr1 and 2.29 ± 1.36MJ m2
yr1
, respectively. According to a previous
theory, if we assume that the trend of the summer surface water heat content was only contributed by
NSTM, it would cause a decrease in sea ice thickness of approximately 13 cm. The analysis partially explains
the reason for sea ice decline in recent years.
关键词：near-surface temperature maximum ; heat content ; Canada Basin ; Arctic Ocean
