Role of atmospheric and oceanic processes on decadal change of Antarctic sea-ice between 2000–2019

IF 1.9 4区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Dynamics of Atmospheres and Oceans Pub Date : 2024-06-28 DOI:10.1016/j.dynatmoce.2024.101481

A. Mukherjee

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Abstract

In this study, recent decadal changes in Sea Ice Concentration (SIC) and Sea Surface Temperature (SST) between the decade of 2010–2019 and 2000–2009 have been studied in the Antarctic regions of the Southern Ocean. Satellite-derived the Advanced Very High-Resolution Radiometer (AVHRR) showed the significant dominance of the decadal increase of SIC in both eastern and western Antarctic sea-ice regions. The maximum decadal increase of SIC has been observed in the Bellingshausen and Amundsen Sea (BAS) sectors of the Antarctic sea-ice regions. The AVHRR data also showed a decadal decrease for SST, but changes are weak compared to SIC. The above observed decadal change of SIC and SST are reasonably well simulated by a global ocean sea-ice coupled model, known as the Modular Ocean Model of version 5 with Sea Ice Simulator (MOMSIS). A simple mixed-layer heat budget analysis has been performed using the model MOMSIS to quantify the contribution of various ocean and atmospheric thermodynamics processes. The significant role of ocean horizontal advection and vertical entrainment has been observed along with atmospheric heat fluxes for a strong decadal increase of SIC in the BAS sectors of the Antarctic sea-ice. The strength of recent decadal variability in the Antarctic sea-ice regions critically depends on both oceanic processes and atmospheric fluxes. Decadal weakening of wind stress and increase of negative wind curl also have a dominant role in association with the decadal increase of SIC in the Antarctic regions of the Southern Ocean.

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大气和海洋过程对 2000-2019 年南极海冰十年变化的影响

本研究对南大洋南极地区 2010-2019 年十年间和 2000-2009 年十年间海冰浓度（SIC）和海面温度（SST）的近期十年变化进行了研究。高级甚高分辨率辐射计（AVHRR）卫星数据显示，在南极东部和西部海冰区，SIC 的旬增量占显著优势。在南极海冰区的贝林斯豪森海和阿蒙森海（BAS）区域观测到的 SIC 十年期增幅最大。高级甚高分辨率辐射计（AVHRR）数据也显示海温在十年内有所下降，但与 SIC 相比变化较小。全球海洋海冰耦合模式（即带海冰模拟器的模块化海洋模式第 5 版（MOMSIS））对上述观测到的海冰和海温十年变化进行了合理的模拟。利用 MOMSIS 模型进行了简单的混合层热预算分析，以量化各种海洋和大气热力学过程的贡献。观察到海洋水平平流和垂直夹带以及大气热通量对南极海冰 BAS 区域 SIC 十年期的强劲增长起了重要作用。南极海冰区域最近十年变化的强度主要取决于海洋过程和大气通量。南大洋南极地区十年期风压减弱和负风卷增加也与十年期SIC增加有关。

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来源期刊

Dynamics of Atmospheres and Oceans 地学-地球化学与地球物理

CiteScore

3.10

自引率

5.90%

发文量

审稿时长

>12 weeks

期刊介绍： Dynamics of Atmospheres and Oceans is an international journal for research related to the dynamical and physical processes governing atmospheres, oceans and climate. Authors are invited to submit articles, short contributions or scholarly reviews in the following areas: •Dynamic meteorology •Physical oceanography •Geophysical fluid dynamics •Climate variability and climate change •Atmosphere-ocean-biosphere-cryosphere interactions •Prediction and predictability •Scale interactions Papers of theoretical, computational, experimental and observational investigations are invited, particularly those that explore the fundamental nature - or bring together the interdisciplinary and multidisciplinary aspects - of dynamical and physical processes at all scales. Papers that explore air-sea interactions and the coupling between atmospheres, oceans, and other components of the climate system are particularly welcome.