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安徽省淮南森林冠层辐射传输过程的特征

戴秋丹 郭振海 孙菽芬 肖霞

戴秋丹, 郭振海, 孙菽芬, 等. 2021. 安徽省淮南森林冠层辐射传输过程的特征[J]. 大气科学, 45(1): 205−216 doi: 10.3878/j.issn.1006-9895.2004.19251
引用本文: 戴秋丹, 郭振海, 孙菽芬, 等. 2021. 安徽省淮南森林冠层辐射传输过程的特征[J]. 大气科学, 45(1): 205−216 doi: 10.3878/j.issn.1006-9895.2004.19251
DAI Qiudan, GUO Zhenhai, SUN Shufen, et al. 2021. Characteristics of Solar Radiation and Radiative Transfer of a Forest Canopy in Huainan, Anhui Province [J]. Chinese Journal of Atmospheric Sciences (in Chinese), 45(1): 205−216 doi: 10.3878/j.issn.1006-9895.2004.19251
Citation: DAI Qiudan, GUO Zhenhai, SUN Shufen, et al. 2021. Characteristics of Solar Radiation and Radiative Transfer of a Forest Canopy in Huainan, Anhui Province [J]. Chinese Journal of Atmospheric Sciences (in Chinese), 45(1): 205−216 doi: 10.3878/j.issn.1006-9895.2004.19251

安徽省淮南森林冠层辐射传输过程的特征

doi: 10.3878/j.issn.1006-9895.2004.19251
基金项目: 国家自然科学基金项目41575092,国家重点研发计划项目2018YFC1506600
详细信息
    作者简介:

    戴秋丹,女,1971年出生,助理研究员,主要从事陆面过程与陆气相互作用研究。E-mail: dqd@lasg.iap.ac.cn

  • 中图分类号: P461

Characteristics of Solar Radiation and Radiative Transfer of a Forest Canopy in Huainan, Anhui Province

Funds: National Natural Science Foundation of China (Grant 41575092), National Key Research and Development Program (Grant 2018YFC1506600)
  • 摘要: 本文利用淮南森林观测站2018年7月1日至2019年6月30日冠层辐射观测,分析了淮南栎树森林下垫面冠层内外辐射变化特征。结果表明:(1)从春季到夏季,栎树冠层之上向下的太阳短波辐射增加,到冬季逐渐减少。从早春开始,由于叶片生长增多,冠层中间和冠层之下向下的太阳短波辐射下降,从秋季到冬季树叶凋落,其向下的太阳辐射增加,与冠层之上的变化趋势相反;对于向上的短波辐射,无论冠层之上、冠层中间还是冠层之下,随季节的变化都与向下的短波辐射相似,只是数值小很多。(2)冠层之上、冠层中间和冠层之下向下的长波辐射,随时间的变化从春季逐渐开始增大至夏季达到最大,随后逐渐减小并在冬季达到最小;就空间变化而言,冠层中间和冠层之下向下的长波辐射值比冠层之上的辐射值高,使得冠层对长波辐射的振幅增大,晴空条件最高可达1.3倍。(3)淮南森林区冠层之上(距地面25 m)年平均反照率为0.14,比中国北方地区(35°N)温带季风气候区(混交林为主)反照率的整体水平低0.01,表明淮南的森林茂密、灌丛更多些。(4)冠层上部分和整层的短波辐射透射率主要受叶片的影响。夏季,冠层的短波透射率平均为0.1。到了冬天,叶子凋落,透射率增加并趋于一个平稳的波动。冠层的短波辐射吸收率在夏季最高,秋季逐渐降低,随着叶子凋落在冬季迅速减小,趋于一常值。
  • 图  1  (a)淮南森林观测站地貌图及(b)108 m观测大塔

    Figure  1.  (a) Geomorphologic map of area around Huainan forest observation station and (b) the 108-m height observation tower

    图  2  淮南森林观测站冠层顶(a)向下短波辐射、(b)向上短波辐射、(c)向下长波辐射和(d)向上长波辐射的月平均值(柱状)和标准差(短线)

    Figure  2.  Monthly means (bars) and standard deviations (short lines) of (a) downward shortwave radiation, (b) upward shortwave radiation, (c) downward longwave radiation, and (d) upward longwave radiation above the canopy at Huainan forest observation station

    图  3  淮南森林观测站冠层顶净辐射月平均(柱状)和标准偏差(短线)

    Figure  3.  Monthly means (bars) and standard deviations (short lines) of net radiation above canopy at Huainan forest observation station

    图  4  淮南森林观测站栎树植被冠层内(a)6 m高度和(b)3.5 m高度向下的短波辐射,以及(c)6 m和(d)3.5 m向上的短波辐射月平均日变化曲线

    Figure  4.  Diurnal variations of monthly mean downward shortwave radiation (a) within the canopy (6 m height) and (b) below the canopy (3.5 m height) and upward shortwave radiation (c) within the canopy (6 m) and (d) below the canopy (3.5 m) at Huainan forest observation station

    图  5  淮南森林观测站栎树植被冠层内6 m和3.5 m高度(a)向下和(b)向上短波辐射月平均日变化

    Figure  5.  Diurnal variations of monthly mean (a) downward and (b) upward shortwave radiation within (6 m) and below (3.5 m) the canopy at Huainan forest observation station

    图  6  冠层之上、冠层中间和冠层之下日平均太阳向下短波辐射

    Figure  6.  Daily mean downward shortwave radiation below, within, and above the canopy

    图  9  冠层之下与冠层之上日平均入射长波辐射的比值(细实线)及日平均大气相对湿度(粗实线)

    Figure  9.  Ratio of downward longwave radiation below the canopy to that above the canopy (thin solid line) and daily mean atmospheric relative humidity (thick solid line)

    图  7  冠层之上、冠层中间和冠层之下日平均太阳向上短波辐射

    Figure  7.  As in Fig. 6, but for upward shortwave radiation

    图  8  冠层之上、冠层中间和冠层之下日平均太阳向下长波辐射

    Figure  8.  As in Fig. 6, but for downward longwave radiation

    图  10  淮南森林站地表反照率的月平均(柱状)和标准偏差(短线)

    Figure  10.  Monthly means (bars) and standard deviations (short lines) of surface albedo at Huainan forest observation station

    图  11  冠层之下、冠层中间和冠层之上的日平均反照率

    Figure  11.  Daily mean albedos below, within, and above the canopy

    图  12  冠层上层、冠层下层和整个冠层的日平均短波辐射透射率

    Figure  12.  Daily mean transmittances of the upper layer, lower layer, and whole canopy

    图  13  地表和冠层的日平均吸收率

    Figure  13.  Daily mean absorbance values of the ground and canopy

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  • 收稿日期:  2019-12-18
  • 录用日期:  2020-04-21
  • 网络出版日期:  2020-04-21
  • 刊出日期:  2021-01-19

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