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1983–2022年南极夏季海冰区反照率的反转变化特征分析

柯长青 李海丽 沈校熠

柯长青,李海丽,沈校熠. 1983–2022年南极夏季海冰区反照率的反转变化特征分析[J]. 海洋学报,2023,45(12):121–132 doi: 10.12284/hyxb2023107
引用本文: 柯长青,李海丽,沈校熠. 1983–2022年南极夏季海冰区反照率的反转变化特征分析[J]. 海洋学报,2023,45(12):121–132 doi: 10.12284/hyxb2023107
Ke Changqing,Li Haili,Shen Xiaoyi. The analysis on reversal of variation trend in the summer albedo of Antarctic sea-ice zone from 1983 to 2022[J]. Haiyang Xuebao,2023, 45(12):121–132 doi: 10.12284/hyxb2023107
Citation: Ke Changqing,Li Haili,Shen Xiaoyi. The analysis on reversal of variation trend in the summer albedo of Antarctic sea-ice zone from 1983 to 2022[J]. Haiyang Xuebao,2023, 45(12):121–132 doi: 10.12284/hyxb2023107

1983–2022年南极夏季海冰区反照率的反转变化特征分析

doi: 10.12284/hyxb2023107
基金项目: 国家自然科学基金项目(41976212);江苏省自然科学基金项目(BK20210193,BK20230799)。
详细信息
    作者简介:

    柯长青(1969—),男,陕西省丹凤县人,教授,研究方向为冰雪水文遥感。E-mail: kecq@nju.edu.cn

  • 中图分类号: P731.15

The analysis on reversal of variation trend in the summer albedo of Antarctic sea-ice zone from 1983 to 2022

  • 摘要: 海冰区反照率会影响辐射收支平衡,对全球气候变化有着重要影响。利用遥感反演的反照率数据产品分析了1983–2022年南极及其6个海域夏季海冰区反照率的时空变化,探讨了海冰密集度、气温和大气环流与海冰区反照率的关系。结果表明,卫星反演的南极夏季海冰区反照率与实测反照率结果一致。西威德尔海海冰区多年平均反照率最高(0.61),罗斯海最低(0.45)。南极夏季海冰区反照率经历了先上升(1983–2015年)后快速下降(2015–2022年)的变化。除了别林斯高晋海–阿蒙森海海冰区反照率前后两个时段均下降外,其余5个海域和南极一样出现了变化趋势的反转。南极海冰区反照率与海冰密集度显著正相关,而与气温显著负相关。1983–2015年夏季气温降低,海冰消融减弱,海冰密集度微弱上升(0.03%/a),海冰面积平均每10年增加2.07 × 105 km2,导致反射的太阳辐射增多,反照率也微弱上升。2015–2022年夏季气温升高,海冰消融加剧,冰间水道和开阔水域增多,海冰密集度下降,海冰区吸收更多的太阳辐射,造成反射辐射减小,因而海冰区反照率快速下降。此外,南极环状模也是影响罗斯海和威德尔海海冰区反照率变化的因素之一。
  • 图  1  南极及其6个海域的空间分布(灰白色区域为冰架)[31]

    Fig.  1  The spatial distributions of Antarctica and six sea sectors (ice shelves are colored in off-white) [31]

    图  2  1983–2022年南极夏季(a)以及12月、翌年1月和2月(b)海冰区反照率变化

    Fig.  2  The albedo variations in Antarctic sea ice regions in summer (a), and December, January and February of the following year (b) from 1983 to 2022

    图  3  1983–2022年南极6个海域夏季海冰区反照率变化

    Fig.  3  The albedo variations in sea ice regions of Antarctica and six sea sectors in summer from 1983 to 2022

    图  4  1983–2022年南极夏季及其不同月份平均海冰区反照率(a)、海冰区反照率变化趋势(b)、平均海冰密集度(c)和平均气温的空间分布(d)

    图b中紫色框所指区域通过了95%显著性水平检验

    Fig.  4  The spatial distributions of averaged albedo in sea ice region (a), variation trend of averaged albedo in sea ice region (b), averaged sea ice concentration (c) and averaged air temperature (d) in summer and individual month in Antarctica from 1983 to 2022

    Regions indicated by purple box in figure b means these trends above 95% significance level

    图  5  1983–2022年南极夏季海冰密集度(a)和气温(b)的变化

    Fig.  5  The variations of summer sea ice concentration (a) and air temperature (b) in Antarctica from 1983 to 2022

    图  6  1983–2022年南极夏季海冰区反照率与海冰密集度(a)和气温(b)的关系

    Fig.  6  The relationships between albedo in sea ice regions and sea ice concentration (a) and air temperature (b) of Antarctica in summer from 1983 to 2022

    图  7  1983–2022年南极夏季SAM变化(a)和SAM与海冰区反照率的关系(b)

    图b中黑色框所指区域通过了95%显著性水平检验

    Fig.  7  Changes in summer Antarctic SAM from 1983 to 2022 (a) and the relationship between albedo in sea ice regions and SAM of Antarctica in summer (b)

    Regions indicated by black box in figure b means these trends above 95% significance level

    表  1  2019年1–2月ICDR CLARA-A2与CLARA-A2海冰区反照率对比

    Tab.  1  The comparison between ICDR CLARA-A2 albedo and CLARA-A2 albedo of Jan–Feb, 2019

    南极海域 ICDR CLARA-A2-SAL CLARA-A2-SAL
    1月 2月 1月 2月
    别林斯高晋海–阿蒙森海 0.50 0.49 0.50 0.50
    印度洋扇区 0.57 0.56 0.57 0.57
    太平洋扇区 0.46 0.47 0.47 0.48
    罗斯海 0.44 0.46 0.45 0.47
    东威德尔海 0.50 0.57 0.50 0.57
    西威德尔海 0.59 0.62 0.59 0.62
    下载: 导出CSV

    表  2  覆盖率加权平均的CLARA-A2反照率与ASPeCt反照率的对比

    Tab.  2  The comparison between coverage-weighted CLARA-A2 albedo and ASPeCt albedo

    南极海域 ASPeCt CLARA-A2-SAL
    别林斯高晋海–阿蒙森海 0.37 0.36
    印度洋扇区 0.28 0.26
    太平洋扇区 0.36 0.32
    罗斯海 0.28 0.28
    威德尔海 0.35 0.40
    下载: 导出CSV

    表  3  1983–2022年南极及其6个海域夏季海冰区反照率平均值和变化速率(%/a)

    Tab.  3  The mean value and change rates of albedo (%/a) in sea ice regions of Antarctica and six sea sectors in summer from 1983 to 2022

    1983–2022年 1983–2015年 2015–2022年
    均值 速率 均值 速率 均值 速率
    别林斯高晋海–阿蒙森海0.51–0.16*0.52–0.19*0.51–0.78*
    印度洋0.480.070.480.15*0.48–0.53
    太平洋0.500.050.500.20**0.48–1.73**
    罗斯海0.45–0.060.460.020.43–1.00*
    东威德尔海0.470.000.480.120.49–1.06*
    西威德尔海0.610.020.610.070.61–1.21**
    南极0.50–0.010.500.040.51–0.96**
      注:**和*分别表示0.01和0.05显著性水平。
    下载: 导出CSV

    表  4  1983–2022年南极及其6个海域夏季海冰密集度和气温均值及其变化速率

    Tab.  4  The mean and change rate of summer sea ice concentration and air temperature in Antarctica and six sea sectors from 1983 to 2022

    1983–2022年 1983–2015年 2015–2022年
    均值 速率 均值 速率 均值 速率
    海冰密集度[均值(%)和速率(%·a–1)]
    印度洋扇区 48 0.07 48 0.07 48 0.90
    别林斯高晋海–阿蒙森海 61 –0.25 62 –0.44* 61 0.13
    罗斯海 52 –0.28** 53 –0.03 43 –0.73
    太平洋扇区 62 0.23* 61 0.39** 63 –1.81
    东威德尔海 56 –0.01 57 0.29* 51 –1.94
    西威德尔海 88 0.05 88 0.07 89 –1.01*
    南极 61 –0.05 62 0.03 59 –1.08*
    气温[均值(℃)和速率(℃·(10 a)–1]
    印度洋扇区 –1.87 –0.04 –1.88 –0.08 –1.85 –0.14
    别林斯高晋海–阿蒙森海 –1.46 –0.01 –1.49 –0.08 –1.36 0.18
    罗斯海 –1.94 –0.02 –1.94 –0.04 –1.97 1.02*
    太平洋扇区 –1.72 –0.03 –1.73 –0.07 –1.70 0.14
    东威德尔海 –2.19 –0.08 –2.14 –0.04 –2.42 0.53
    西威德尔海 –1.95 –0.16** –1.91 –0.22** –2.16 0.03
    南极 –1.91 –0.06* –1.90 –0.10** –1.98 0.50
      注:**和*分别表示0.01和0.05显著性水平。
    下载: 导出CSV

    表  5  1983–2022年南极及其6个海域夏季海冰区反照率与海冰密集度和气温的相关系数及显著性

    Tab.  5  Correlation coefficients and corresponding significances between albedo in sea ice region and sea ice concentration and air temperature of Antarctica and six sea sectors in summer from 1983 to 2022

    海冰密集度 气温
    印度洋扇区 0.55** –0.06
    别林斯高晋海–阿蒙森海 0.91** –0.11
    罗斯海 0.76** –0.44**
    太平洋扇区 0.81** –0.07
    东威德尔海 0.78** –0.32*
    西威德尔海 0.77** –0.57**
    南极 0.59** –0.41**
      注:**和*分别表示0.01和0.05显著性水平。
    下载: 导出CSV
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  • 收稿日期:  2022-12-20
  • 修回日期:  2023-09-18
  • 网络出版日期:  2023-12-29
  • 刊出日期:  2023-12-01

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