| 玛曲高寒草甸夏季近地层微气象和CO2通量特征分析 |
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| 引用本文： | 张懿,文小航,王少影,尚伦宇,张宇.玛曲高寒草甸夏季近地层微气象和CO2通量特征分析[J].冰川冻土,2019,41(1):54-63. |
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| 作者姓名： | 张懿 文小航 王少影 尚伦宇 张宇 |
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| 作者单位： | 成都信息工程大学大气科学学院高原大气与环境四川省重点实验室,四川成都610225;广安市环境监测站,四川广安638000;成都信息工程大学大气科学学院高原大气与环境四川省重点实验室,四川成都610225;北京师范大学珠海分校珠海区域气候-环境-生态预测预警协同创新中心,广东珠海519087;中国科学院西北生态环境资源研究院寒旱区陆面过程与气候变化重点实验室,甘肃兰州,730000;成都信息工程大学大气科学学院高原大气与环境四川省重点实验室,四川成都,610225 |
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| 基金项目： | 国家自然科学基金项目(91537214；41405063）资助 |
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| 摘 要： | 利用2015年夏季玛曲高寒草甸观测资料，从中选取7月10个连续完整的观测日，分析了近地层气象要素、地表辐射和能量传输以及CO2通量日变化特征。结果表明：夏季玛曲地区气温和比湿昼夜差异较大，最大温差为19.2 ℃，平均风速为2.7 m?s-1，风向以东风为主。晴天条件下向下短波辐射可达1 200 W?m-2左右，平均地表反照率为0.22，均大于藏北那曲地区。净辐射峰值可达850 W?m-2左右，陆-气间能量传输以潜热输送为主。10 d能量闭合度平均值为0.61，能量不平衡程度较大。夏季玛曲高寒草甸表现为“碳汇”，CO2通量平均值为-0.20 mg?m-2?s-1，晴天碳吸收最大速率为-14.05 mg?m-2?s-1，显著大于阴天，最大碳吸收时长为13 h，CO2密度平均值为530.7 mg?m-3。
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| 关 键 词： | 黄河源区 高寒草甸 能量平衡 CO2通量 |
| 收稿时间： | 2017-09-28 |
| 修稿时间： | 2018-01-25 |
Analysis of the near-surface micrometeorology and CO2 flux over the Maqu alpine meadow in summer#br# |
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| ZHANG Yi,WEN Xiaohang,WANG Shaoying,SHANG Lunyu,ZHANG Yu.Analysis of the near-surface micrometeorology and CO2 flux over the Maqu alpine meadow in summer#br#[J].Journal of Glaciology and Geocryology,2019,41(1):54-63. |
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| Authors: | ZHANG Yi WEN Xiaohang WANG Shaoying SHANG Lunyu ZHANG Yu |
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| Abstract: | For a better comprehension of the characteristics of
the micrometeorology and CO2 flux in Maqu alpine meadow in the
Yellow River source regions during summer, in-situ measured data in Zoige Plateau Wetlands
Ecosystem Research Station were collected. The continuous and integrated
surface and near surface meteorological elements, such as ground surface radiation
and albedo, energy balance and closure ratio, CO2 flux and density from July 4 to 13 in 2015 were collected, and their daily
variations were analyzed. The analyses show that: The variation tendency of specific humidity is
almost converse with that of air temperature, and both have significant difference
between daytime and nighttime. Wind speed in daytime is larger than that in nighttime,
and east wind is the dominated wind direction. Soil moisture shows a
sustainable decrease during fine days. The peak value of downward shortwave
radiation reaches up to about 1 200 W?m-2, close to that in Lake Ngoring lakeside
and larger than that in Nagqu. The daily averaged albedo is 0.22, close to those
in Lake Ngoring lakeside alpine meadow and Northern Tibetan Plateau, and larger
than those in Litang and Haibei alpine meadow. The peak value of the net radiation
is about 850 W?m-2. There are
negative ground heat flux, latent heat flux and sensible heat flux during
nighttime. The energy transfer between land surface and atmosphere is dominated
by latent heat. Otherwise, the averaged energy closure ratio is 0.56. The
averaged CO2 flux and density over the Maqu alpine meadow are -0.20
mg?m-2?s-1 and 530.7 mg?m-3, respectively. |
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| Keywords: | Yellow River source regions alpine meadow energy balance CO2 flux |
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